An innovative technique for the fabrication of fixed removable guide flange prosthesis for lateral mandibular resection
Rehabilitation of patients with a severe mandibular defect is challenging to prosthodontists. Theesthetic and functional rehabilitation of patients with lateral mandibular resection is difficult dueto the lack of supporting tissues for the prosthesis. The mandibular deviation furthermore resultsin facial asymmetry and unstable occlusion. This case report describes an innovative technique torehabilitate a patient with lateral mandibular resection using customized access post attachmentsystem to retain guide flange prosthesis for reducing mandibular deviation. (Source: Dental Research Journal)
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

The effect of low-level light therapy on orthodontic tooth movement rate, heat shock protein 70, and matrix metallopreteinase 8 expression: Animal study
Background: The aim of this study was to determine the effect of low ‑level light therapy (LLLT)on orthodontic tooth movement (OTM) rate, heat shock protein 70 (HSP ‑70) expression, andmatrix metalloproteinase 8 (MMP ‑8) expression.Materials and Methods: In this experimental study twenty ‑four male guinea pigs were randomlydivided into three groups (n = 8): control group (K) without orthodontic force and LLLT; treatmentgroup 1 (T1) with orthodontic force, and treatment group 2 (T2) with orthodontic force and LLLT.The labial surfaces of both maxillary central incisors in treatments groups were installed withsingle ...
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

Comparison of the microleakage of mineral trioxide aggregate, calcium ‑enriched mixture cement, and Biodentine orthograde apical plug
Background: One ‑visit apexification is a treatment of choice in necrotic immature open apexteeth. Calcium silicate base materials are suitable for this method. The purpose of this study wasto investigate and compare the sealing efficiency of Biodentine, mineral trioxide aggregate (MTA)ProRoot, and calcium ‑enriched mixture (CEM) cement orthograde apical plug using bacterialleakage method.Materials and Methods: In this in vitro study a total of 70 extracted maxillary incisors werecleaned and shaped. A 1.1 ‑mm standardized artificially open apex was created in all samples.The teeth were randomly divided into three exp...
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

Relationship between cephalometric cranial base and anterior ‑posterior features in an Iranian population
Background: The relationship between the dimensions of the cranial base and skeletalanterioposterior problem has been controversial for years. The aim of this study was to determinethe relationship between the anterioposterior cephalometric indicators and the cranial basecephalometric indicators in an Iranian population.Materials and Methods: In this historical cohort cephalograms of 100 skeletal Class I patients,101 skeletal Class II patients, and 98 skeletal Class III patients were selected. The cephalograms weretraced manually and the indicators were measured. Finally, data were analyzed by SPSS softwareusing the Mann &...
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

Cartilage tissue formation from human adipose ‑derived stem cells via herbal component (Avocado/soybean unsaponifiables) in scaffold‑free culture system
Conclusion: It can be concluded that A/S similar to TGF ‑β1 is able to facilitate the chondrogenicdifferentiation of hADSCs and do not have adverse effects of TGF ‑β1. Thus, TGF‑β1 can be replacedby A/S in the field of tissue engineering. (Source: Dental Research Journal)
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

Are oral health education for carers effective in the oral hygiene management of elderly with dementia? A systematic review
Elderly with dementia or cognitive impairment are at increased risk of poor oral health. Oral healtheducation programs targeting carers may be an effective strategy to improve oral hygiene. Theaim of this review was to assess the effectiveness of oral health education programs for carers onthe oral hygiene of elderly with dementia. A literature search was performed to identify studiespublished in five electronic databases (PubMed, MEDLINE, EMBASE, CINAHL, and PsycINFO),without time and language restrictions. Two independent coders extracted data and assessed therisk of bias for each included study. Of the 243 studies, only...
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

Influence of calcium hydroxide residues after using different irrigants on the accuracy of two electronic apex locators: An in vitro study
Conclusion: The present study revealed that no statistically significant differenceswere observed between the two apex locators after Ca(OH)2 paste removal with differentirrigants. (Source: Dental Research Journal)
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

Prevention of secondary caries by a new antibacterial compound
The objective of this studywas to synthesize 3 ‑(2, 5‑dimethylfuran‑3‑yl)‑1H‑pyrazole‑5(4H)‑one and check its biocompatibilityand antibacterial properties in flowable dental composites.Materials and Methods: In this animal study, the antibacterial activity of flowable resin compositescontaining 0 –5 wt% 3‑(2,5‑dimethylfuran‑3‑yl)‑1H‑pyrazole‑5(4H)‑one was investigated by usingagar diffusion and direct contact tests on the cured resins. Statistical analysis was performed usingone ‑way ANOVA test (P
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

Finite element analysis of stress distribution around short and long implants in mandibular overdenture treatment
Conclusion: Using implants with different lengths in mandibular overdenture caused no majorchanges in stress distribution in peri ‑implant bone; short implants were somehow comparable tolong implants.  (Source: Dental Research Journal)
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

Shear bond strength of orthodontic brackets to porcelain surface using universal adhesive compared to conventional method
This study sought to compare the shear bond strength (SBS)of orthodontic brackets to feldspathic porcelain using universal adhesive and conventional adhesivewith and without silane application.Materials and Methods: In this in vitro study Fifty ‑six feldspathic porcelain discs were roughenedby bur, and 9.6% hydrofluoric acid was used for surface preparation. Samples were divided intothe following four groups (n = 14): Group 1: universal adhesive, Group 2: universal adhesive/silane,Group 3: conventional adhesive, and Group 4: conventional adhesive/silane. Mandibular centralincisor brackets were bonded, and SBS was measure...
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

Reconstruction of mandibular defects using synthetic octacalcium phosphate combined with bone matrix gelatin in rat model
Background: Regeneration of bone defects remains a challenge for maxillofacial surgeons. Theobjective of this study was to assess the osteogenic potential of octacalcium phosphate (OCP)and bone matrix gelatin (BMG) alone and in combination with together in artificially createdmandibular bone defects.Materials and Methods: In this experimental study Forty ‑eight male Sprague–Dawleyrats (6 –8 weeks old) were randomly divided into four groups. Defects were created in the mandibleof rats and filled with 10 mg of OCP, BMG, or a combination of both (1/4 ratio). Defects were leftunfilled in the control group. To ass...
Source: Dental Research Journal - January 20, 2020 Category: Dentistry Source Type: research

Effect of Er:YAG laser cavity preparation on the bond strength of 2 ‑hydroxyethyl methacrylate‑free and 2‑hydroxyethyl methacrylate‑rich self‑etch adhesive systems: An in vitro study
This study wasdone to evaluate the effect of Er:YAG laser cavity preparation on the microtensile bond strengthof 2 ‑hydroxyethyl methacrylate (HEMA)‑rich and HEMA‑free one‑step self‑etch adhesive systems.Materials and Methods: In this in vitro study, eighty freshly extracted human premolars werecollected. Cavities were prepared in 40 teeth with carbide bur (Group 1) and in other 40 teethwith Er:YAG LASER (490 mJ and 15 Hz) (Group 2). Subgroups of twenty teeth each were madeaccording to the adhesive systems used. After placement of restoration, the mean values of the bondstrength were calculated using universal te...
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

Seven ‑year follow‑up of spontaneous bone regeneration following segmental mandibulectomy: Alternative option for mandibular reconstruction
Bone formation in small deposits following the loss of part of the mandible has often been reportedin the literature, but the long ‑term follow‑up reports of bone regeneration extending over themandible are rare. Even rarer, are reports on the behavior of such new bone in terms of facialdevelopment, over a long period and the effect of load on it. A unique case of bone regeneration afterresection of a large portion of the mandible in a 9 ‑year‑old male patient with myxofibrosarcoma inthe body of the mandible is presented here. Intermaxillary fixation and insertion of reconstructionplate after resection without cont...
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

Comparison of the longevity of prefabricated and conventional band and loops in children ’s primary teeth
Conclusion: There is a similar success rate for the conventional and prefabricated band and loops.Key Words: Child, primary teeth, space maintenance (Source: Dental Research Journal)
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

Comparative evaluation of the cortisol level of unstimulated saliva in patients with and without chronic periodontitis
Background: Chronic periodontitis (CP) is one of the most prevalent diseases of the oral cavitywith various biological and behavioral risk factors. We aimed to evaluate the association betweenthe salivary cortisol level (SCL) of unstimulated saliva and CP in patients referred to Isfahan DentalFaculty.Materials and Methods: In this analytic cross ‑sectional study, 90 patients were selected basedon the presence of periodontitis and were divided into two groups: with periodontitis and withoutperiodontitis (n = 45). First, by evaluating the level of anxiety with Spielberger State ‑Trait AnxietyInventory questionnaire, each...
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

Comparison of the accuracy of open ‑tray and snap‑on impression techniques of implants with different angulations
Conclusion: Regarding the findings of this study, it can be concluded that snap ‑on technique isless accurate than open ‑tray technique, and the accuracy of 25° implant is less than that of 0°, 10°,and 15 ° implants.Key Words: Accuracy, dental implants, dental impression techniques (Source: Dental Research Journal)
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

Effect of hemostatic agent on microshear bond strength of total ‑etch and self‑etch adhesive systems
This study aimed to assess the effect of ferric sulfate on microshearbond strength of four total ‑ and self‑etch adhesives to dentin after water storage.Materials and Methods: In this in vitro study, 192 dentin slices with 2 mm thickness were madeof 64 extracted sound human third molars. The samples were divided into 8 groups (n = 24) asfollows: G1: Scotchbond Multi ‑Purpose, G2: hemostatic agent + Scotchbond, G3: Adper SingleBond, G4: hemostatic agent + Adper, G5: Clearfil SE Bond, G6: hemostatic agent + Clearfil, G7:Single Bond Universal, and G8: hemostatic agent + Single Bond Universal. Composite cylinders with0.7...
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

Accuracy of two electronic apex locators in locating root perforations in curved canals in dry and wet conditions: A comparative in vitro study
Background: The aim of the study was to evaluate the accuracy of iPex and Vdw gold apexlocators in detecting simulated root perforations in curved canals in the presence of 3% sodiumhypochlorite (NaOCl) and 2% chlorhexidine (CHX).Materials and Methods: In this comparative in vitro study Twenty mandibular molars with curvedmesial roots were selected and perforation was made in the danger zone 4 mm from the furcationarea. The actual length of the perforation site was measured using stereomicroscope software usinga #15 K file, following which the teeth were embedded in alginate molds. The perforation site waselectronically me...
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

The effects of sodium hexametaphosphate combined with other remineralizing agents on the staining and microhardness of early enamel caries: An in vitro modified pH ‑cycling model
Conclusion: SHMP, either alone or combined with remineralizing agents, created the least staining.Remineralizing materials alone showed higher surface hardness, while sodium fluoride alone showedhigher surface hardness when combined with SHMP.Key Words: Casein phosphopeptide ‑amorphous calcium phosphate, fluoride , remineralization,sodium hexametaphosphate (Source: Dental Research Journal)
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

Analysis of artifacts in oral and maxillofacial histopathologic sections and related reasons
Conclusion: The results of this study showed a high number of artifacts in the histopathologicsections, the most frequent artifact being reported for the folding artifact. It seems adequate controlof specimens and preventing technical errors can reduce the number of artifacts.Key Words: Artifact, frequency, histopathological (Source: Dental Research Journal)
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

Evaluation of tooth discoloration after treatment with mineral trioxide aggregate, calcium ‑enriched mixture, and Biodentine® in the presence and absence of blood
This study evaluated tooth discoloration after treatmentwith mineral trioxide aggregate (MTA), calcium ‑enriched mixture (CEM) cement, and Biodentine®in the presence and absence of blood using spectrophotometric analysis.Materials and Methods: In this experimental study, A total of 68 extracted permanent anteriorteeth were prepared and randomly divided into two groups as follows: the sponge embedded in accesscavities was saturated with fresh blood or normal saline using insulin syringe, and then each group wassubdivided into the following three cement subgroups: MTA ‑Angelus®, CEM cement, and Biodentine;these m...
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

Antimicrobial and physical properties of alginate impression material incorporated with silver nanoparticles
Conclusion: Antimicrobial effect of alginate mixed with silver nanoparticles is not clinically indicated.Nevertheless, its physical features did not change significantly.Key Words: Dental impression materials, microbiologic, nanotechnology (Source: Dental Research Journal)
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

In vitro comparison of marginal and internal fit between stainless steel crowns and esthetic crowns of primary molars using different luting cements
This study was to assess and compare the marginal and internal fit of stainless steelcrowns (SSCs) with those of preveneered SSCs and zirconia crowns using different luting cements.Materials and Methods: In this in vitro study, 36 primary first molars were divided into threegroups (n = 12) each prepared to receive different crowns (SSCs, preveneered SSCs, or zirconiacrowns). Each group was further subgrouped (n = 4) according to the luting cement (resin cement,glass ionomer cement [GIC], or resin ‑modified GIC [RMGIC]). After cementation, the teeth weresectioned in the buccolingual direction to assess the marginal and in...
Source: Dental Research Journal - November 3, 2019 Category: Dentistry Source Type: research

Frequency of chemoradiotherapy ‑induced mucositis and related risk factors in patients with the head‑and‑neck cancers: A survey in the North of Iran
In this study, we aimed at evaluating the frequency of chemoradiotherapy ‑inducedmucositis (CIM, RIM) and its related risk factors in patients with the head ‑and‑neck cancers (HNCs).Materials and Methods: In this cross ‑sectional prospective descriptive study, we evaluated atotal of 54 HNCs patients referred to the Oncology Chemoradiotherapy Department of Razi andAmiralmomenin University Hospitals of Rasht, for site and grade (WHO classification) of CIM/RIM,based on their demographic features and possible risk factors. SPSS software version 18 and statisticaltests (i.e., Fisher ’s exact test) were used, and t...
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

The antibacterial effects of coffee extract, chlorhexidine, and fluoride against Streptococcus mutans and Lactobacillus plantarum: An in vitro study
Background: The aim of the present study was to compare the antibacterial effects of coffeeextract with those of 0.2% sodium fluoride and chlorhexidine (CHX) mouthrinses on Streptococcusmutans and Lactobacillus plantarum in vitro.Materials and Methods: In this experimental in vitro study, the minimum inhibitoryconcentration (MIC), minimum bactericidal concentration (MBC), and disk diffusion method weredetermined for different concentrations of coffee extract, 0.2% CHX, and 0.2% fluoride againstS. mutans and L. plantrum. Data were analyzed using Kruskal –Wallis analysis. Statistical significancelevel was established at P
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Effectiveness of buccal pouch grafting in minimizing loss of alveolar dimension: A canine investigation
Background: The study ’s purpose was to study buccal pouch grafting (BPG) with xenograft,freeze ‑dried bone allograft (FDBA), or FDBA + decalcified FDBA (DFDBA) on alveolar ridge widthpreservation and overlying soft tissue thickness at dog premolar extraction sites.Materials and Methods: In this animal study, 4 dogs had their mandibular first premolar (P1) anddistal roots of P2, P3, and P4 extracted (after endodontic treatment of the mesial roots) bilaterally.A small buccal pouch was created at each extraction socket and four treatments tested: nothing,xenograft, FDBA, or FDBA + DFDBA. Casts made pretreatment and a...
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Isolation of Enterococcus faecalis in the saliva samples of patient candidates for liver transplantation
This study investigated the prevalence of Enterococcus faecalisin the saliva samples of patient candidates for liver transplantation.Materials and Methods: In this cross ‑sectional study the saliva samples of 100 patient candidatesfor liver transplantation and 100 age ‑ and sex‑matched healthy control group were collected.Bacterial DNA was extracted from the samples and E. faecalis was detected using polymerase chainreaction test. Fisher ’s exact test and Mann–Whitney test were used to correlate the positive andnegative cases with the disease. Statistically, a significant difference was considered when P
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Angiogenesis in odontogenic keratocyst and dentigerous cyst: Evaluation of JunB and VEGF expression
Background: Nowadays, different clinical behaviors of odontogenic cysts, little information abouttheir biological agents, importance of diagnosis, and early diagnosis of these lesions have encouragedthe researchers to conduct new studies. JunB acts as a regulator of vascular endothelial growthfactor (VEGF) protein production and affects vessel proliferation and tissue angiogenesis. Hence, thisstudy was conducted to compare angiogenesis through VEGF and JunB expression in odontogenickeratocysts (OKCs) and dentigerous cysts (DCs).Materials and Methods: A total of 25 paraffin blocks of OKCs and 25 DCs were included inthis exp...
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Effect of heat treatment and addition of 4 ‑META to silane on microtensile bond strength of IPS e.max CAD ceramic to resin cement
Background: Silane promotes bonding between ceramic and resin cement. Silane function could beimproved by heat treatment and adding 4-Methacryloxyethyl trimellitate anhydride (4-META). Theaim of this study was to assess the effect of heat treatment and adding 4 ‑META to silanes on themicrotensile bond strength of IPS e.max CAD ceramic and resin cement.Materials and Methods: In this in vitro study, 32 IPS e.max CAD blocks (6 mm × 6 mm × 4 mm)were randomly divided into 8 groups of 4. The ceramic surfaces were etched by 10% hydrofluoric (HF)for 20 s, and Clearfil Ceramic Primer Plus, Clearfil Porcelain Bond Acti...
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Remineralization potential of dentifrice containing nanohydroxyapatite on artificial carious lesions of enamel: A comparative in vitro study
Background: A carious lesion is the accumulation of numerous episodes of demineralization andremineralization, rather than a unidirectional demineralization process. Tooth destruction can bearrested or reversed by the frequent delivery of fluoride or calcium/phosphorous ions to the toothsurface. Nanohydroxyapatite particle ‑containing dentifrices are the newer generation of productswhich claim to remineralize enamel lesions effectively. The aim of this study was to evaluate andcompare the remineralization ability of dentifrices containing nanohydroxyapatite, NovaMin, andamine fluoride on artificial enamel caries.Material...
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Electrochemical assessment of laser ‑treated titanium alloy used for dental applications at acidic pH condition (in vitro study)
Conclusion: Er, Cr: YSGG laser could improve the corrosion resistance of Ti –6Al–4V at acidic pH.Key Words: Corrosion, electrochemical, laser therapy, Ti –6Al–4V (Source: Dental Research Journal)
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Comparison of bond strength of two porcelains and two base metal alloys in metal ‑ceramic restorations
Background: The purpose of this study was to evaluate the bond strength between two porcelains(VITA VMK Master and VITA VM13) and two types of base metal alloys (Ceramill Sintron andVerabond).Materials and Methods: In an experimental study, 20 rectangular strips (25 mm × 4 mm × 0.5 mm)of each base metal alloy (Ceramill Sintron and Verabond) were fabricated according to themanufacturer ’s instructions. After sandblasting and polishing, the samples were placed in an ultrasonicdevice to remove surface contaminants. A surface of 8 mm × 4 mm × 1 mm of samples was veneeredwith Vita VM13 and VITA VMK...
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Dental education: Lecture versus flipped and spaced learning
Conclusion: Spaced learning methodology was better than the traditional lecture method and theflipped classroom concerning knowledge gains when measured immediately after the applicationof learning method. For long ‑term knowledge retention, both the flipped classroom and spacedlearning teaching methods were comparable to the traditional lecture method.Key Words: Feedback, knowledge, lecture (Source: Dental Research Journal)
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Sponge amnion potential in post tooth extraction wound healing by interleukin ‑6 and bone morphogenetic protein‑2 expression analysis: An animal study
Background: Wound tooth extraction is a mechanical injury that traumatizes adjacent tissue.Sponge amnion contains growth factors that can promote postextraction wound healing. Amnionmembranes can be transformed into sponge form rendering it easier to use. The aim of thisstudy is to analyze interleukin ‑6 (IL‑6) and bone morphogenetic protein‑2 (BMP‑2) expression inpostextraction wound healing on the 1st and 7th day after sponge amnion application.Materials and Methods: Twenty ‑eight Wistar rats were used in this experimental descriptiveanalytical study. Fourteen animals ’ first right anterior mandible tooth...
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Comparison of therapeutic effect of mucoadhesive nanotriamcinolone gel and conventional triamcinolone gel on oral lichen planus
Background: Oral lichen planus (OLP) is a chronic disease without any definitive treatment. Localcorticosteroids are often prescribed, but their efficacy has been questioned by many studies. Thepurpose of this study was to investigate the effect of nano ‑based triamcinolone acetonide gel (NT)and compare it with conventional triamcinolone gel (CT) on OLP.Materials and Methods: In this triple ‑blind randomized clinical trial study, 40 patients with ErosiveOLP were divided into two groups receiving (CT) and (NT). The patients were requested to applythem four times a day for 2 weeks. The severity of pain was evaluated thro...
Source: Dental Research Journal - August 31, 2019 Category: Dentistry Source Type: research

Prevalence of main dental diseases in children who live in conditions of biogeochemical fluorine and iodine deficiency
We examinedit in children aged 6 –15 years who live in conditions of biogeochemical fluorine and iodinedeficiency (Transcarpathian region, Ukraine), to improve the quality of dental care.Materials and Methods: In this cross sectional study To assess the state of teeth, we usedindicators recommended by the WHO Expert Committee. The prevalence and intensity of dentalcaries, periodontal status, oral hygiene status and dentoalveolar anomalies were determined usinga questionnaire and descriptive analyses was done (P
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

In vivo study on the release of nickel, chromium, and zinc in saliva and serum from patients treated with fixed orthodontic appliances
This study was undertaken to assess the release of nickel, chromium, and zinc in saliva and serumof patients undergoing fixed orthodontic treatment.Materials and Methods: This in vivo study was conducted on 80 participants with an age rangeof 15 –40 years. Thirty were included as controls and 50 participants were treated with fixedorthodontic appliances. Saliva and blood samples were collected at five different periods, beforeinsertion of fixed orthodontic appliance and at 1 week, 3 months, 1 year, and 1.5 years after insertionof appliance, respectively. The metal ion content in the samples were analyzed by atomic ab...
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

Effect of bleaching protocols on surface roughness and biofilm formation on silorane ‑based composite resin
This study aimedto assess the effect of different bleaching protocols on surface roughness and biofilm formationon a silorane ‑based composite resin.Materials and Methods: In this in vitro experimental study, 60 silorane ‑based composite resinsamples measuring 3 mm in thickness and 6 mm in diameter were fabricated and polished. Theywere then randomly divided into four groups (n = 15). In Group 1, samples were stored in distilledwater as control. Samples in Groups 2, 3, and 4 were subjected to bleaching with 15% carbamideperoxide, 35% hydrogen peroxide, and 35% hydrogen peroxide activated by light, respectively. Surface...
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

Comparison of self ‑adhering flowable composite microleakage with several types of bonding agent in class V cavity restoration
Background: The aim of the present study was to compare the marginal seal of self ‑adheringflowable composite resin with three universal bonding systems using the self ‑etch technique in ClV cavities at enamel and dentin margins.Materials and Methods: In this in vitro study, Cl V cavities were prepared on the buccal surfacesof forty premolars, with the occlusal margin of each cavity on enamel and gingival margin on dentin.The teeth were divided into four groups (n = 10) in terms of the adhesive used; Group 1: VertiseFlow (VF) self ‑adhering composite resin, Group 2: Clearfil S3 Bond Universal (CS3BU), Group 3:G ‑Pr...
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

Does residual bone thickness apical to periodontal defect play a major role in maxillary sinus mucous membrane thickness?: A cone ‑beam computed tomography‑assisted retrospective study
Background: The mucous membrane of the maxillary sinus is very sensitive to foreign bodiesand infections. Any triggering may lead to mucous membrane thickening (MMT). Residual bonethickness (RBT) is the remaining bone apical to the periodontal defect until the floor of the maxillarysinus acts as a barrier for the periodontal infections to reach the sinus. The aim of our currentstudy was to evaluate the minimal RBT to prevent periodontal infection to reach Schneiderianmembrane using cone ‑beam computed tomography (CBCT).Materials and Methods: In this descriptive study, 144 maxillary sinus exposure records of100 patients w...
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

Bleaching during orthodontic treatment and its effect on bracket bond strength
This study investigated the effect of two different methods of bleaching duringorthodontic treatment on bracket bond strength.Materials and Methods: A total of 45 extracted premolar teeth were selected in thisexperimental study and divided into three groups (office bleaching with 35% hydrogen peroxide,home bleaching with 22% carbamide peroxide, and control). The color of the teeth was assessedinitially before the application of bleaching agents and Thermocycling. Orthodontic brackets weresubsequently bonded on the treated surfaces. Bleaching procedures were then performed. A finalcolor measurement was performed at two poin...
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

Comparison of shear bond strength and enamel surface changing between the two ‑step etching and primer and self‑etch primer methods in rebonding of orthodontic brackets: An in vitro study
Background: The aim of this study was to compare shear bond strength (SBS) and enamel surfacechanging of two methods of bonding in rebonding of orthodontic brackets.Materials and Methods: In this in vitro study, 30 human premolars were randomly classified intothree equal groups. Two bonding systems were applied. At first bonding, Group 1 and 2 were bondedby conventional etching and primer technique (CEP) and Group 3 by self ‑etching primer (SEP).Thermocycling for 5000 cycles was done. Then, 30 brackets were debonded and SBS and Adhesiveremnant index (ARI) were evaluated. One sample was selected from each group, for SEM, ...
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

Shear bond strength of ceramic and metal brackets bonded to enamel using color ‑change adhesive
This study aimed to compare the shear bond strength (SBS) of ceramic andmetal brackets bonded to the enamel using Grengloo color ‑change adhesive and Transbond XTconventional composite.Materials and Methods: In this in vitro, experimental study, 120 extracted human premolars weredivided into four groups: (1) Grengloo with metal brackets, (2) Grengloo with ceramic brackets,(3) Transbond XT with metal brackets, and (4) Transbond XT with ceramic brackets. After bracketbonding, the teeth were subjected to 500 thermal cycles and incubated at 37 °C for 24 h. The SBSwas measured and the data were analyzed using two ‑way A...
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

Three ‑dimensional measurement of tooth inclination: A longitudinal study
This study aimed to measure the change in inclination of teeth after theperiods of 2 and 4 years in adolescents with normal occlusion using three ‑dimensional (3D) software.Materials and Methods: This retrospective longitudinal study was conducted on 54 pairs ofdental casts of 24 adolescents between 9 and 13 years of age with normal occlusion. The inclinationof teeth was determined by 3D measurements using OrthoAid software. After scanning the castsvia stereophotogrammetric scanner, the mean and standard deviation of inclination of teeth werecalculated at three time points. Change in these values was calculated after 2 a...
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

Comparative evaluation of two caries detection systems for detecting the prevalence of early childhood caries: A cross ‑sectional study
Background: The early diagnosis of dental caries is very crucial to prevent tooth loss, which leadsto serious consequences in preschool children. The aim of this study is to compare the diagnosticoutcome by the World Health Organization (WHO) and WHO and early carious lesions (ECLs)(i.e., WHO + ECL) criteria for assessing early childhood caries (ECC) in preschool children.Materials and Methods: A cross ‑sectional, comparative study was conducted among 3–5year old children (n = 358). Clinical examination was conducted using WHO and WHO + ECLcriteria. The data were assessed using paired “t” test. P
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

Evaluation of sealing abilitiy of mineral trioxide aggregate mixed with propylene glycol as a root canal sealer: A in vitro study
Background: Sealing ability is one of the most important features of endodontic sealers. The maingoal of the present study was to compare sealing ability of mineral trioxide aggregate (MTA) ‑propyleneglycol (PG) with two commonly used resin ‑based and MTA‑based sealers.Materials and Methods: In This in vitro study Seventy extracted single ‑root teeth were used.Canal preparation was carried out using hand and RaCe rotary files. Ten teeth were used ascontrol. The root canals in positive and negative control groups were left empty. Remaining60 teeth were randomly divided into following four groups (n = 15): In Group 1...
Source: Dental Research Journal - June 17, 2019 Category: Dentistry Source Type: research

Effect of thread depth and implant shape on stress distribution in anterior and posterior regions of mandible bone: A finite element analysis
Conclusion: The simulation results indicate that all models have the same von Mises stressdistribution pattern and higher peak von Mises stresses of the cortical bone were seen in taperedimplant body in contrast to the cylindrical body.Key Word: Dental Implant ‑Abutment Design, finite element analysis, mandible, stress (Source: Dental Research Journal)
Source: Dental Research Journal - April 9, 2019 Category: Dentistry Source Type: research

Effect of ceramic translucency and luting cement shade on the color masking ability of laminate veneers
Conclusion: None of the 0.5 ‑mm veneers of the two ceramic systems could reach A1 shadewithout a detectable color difference after cementation. The change in degree of veneer translucencywas more effective than the change in luting agent shade in masking the underlying dark substrate.Key Words: Ceramics, esthetics, resin cement (Source: Dental Research Journal)
Source: Dental Research Journal - April 9, 2019 Category: Dentistry Source Type: research

Comparison of color stability and fracture resistance of two temporary fiber ‑reinforced fixed partial denture materials
Conclusion: Coffee is considered as one of the most important factors affecting color changes inprovisional FPDs, either in composite resins or in PMMAs. Fracture resistance of both compositeresin and PMMA FPDs revealed no significant differences between the groups; however, therewere significant differences between the nonreinforced and fiber ‑reinforced FPDs in both groups.Key Words: Acrylic resins, color, composite resins, fiberglass, fixed partial denture (Source: Dental Research Journal)
Source: Dental Research Journal - April 9, 2019 Category: Dentistry Source Type: research

In vitro effect of XP ‑Endo finisher on the amount of residual debris and smear layer on the root canal walls
This study aimed to assess the effect of XP ‑Endo finisher on the amount ofresidual debris and smear layer on the root canal walls of mandibular second premolars.Materials and Methods: In this In vitro study Fifty extracted mandibular second premolars with a rootcurvature
Source: Dental Research Journal - April 9, 2019 Category: Dentistry Source Type: research