Effect of different surface treatment protocols on the bond strength between lithium disilicate and resin cements
AbstractBecause the use of hydrofluoric acid (HF) poses health risks if handled improperly, many clinicians prefer to have the ceramic restorations pre-etched in dental laboratories. However, during the try-in procedure, the pre-etched glass –ceramic restorations may be contaminated with saliva resulting in reduced bond strength. This in-vitro study aimed to investigate the effect of different surface treatments on the bond strength of lithium disilicate (LD) glass–ceramic restorations (IPS e.max Press, Ivoclar Vivadent) to two resi n cements. One-hundred eighty blocks (4X4X3mm) of LD glass–ceramic were divided into ...
Source: Odontology - April 10, 2023 Category: Dentistry Source Type: research
The effects of different surface treatments applied to milled PMMA denture base material on repair bond strength
This study aims to evaluate the shear bond strength of PMMA repair materials after various surface treatments on CAD/CAM PMMA denture base material. For this purpose, a total of 480 CAD/CAM PMMA denture base test specimens were manufactured. Then all test specimens were divided into 6 groups, and different surface treatments were applied. Group A: sandblasting, Group B: 4% hydro fluoric acid, Group C: tungsten carbide bur, Group D: dichloromethane  + methyl methacrylate mixture, Group E: dichloromethane and methyl methacrylate, Group F: no surface treatment. Each group is then divided into 4 different subcategories; re...
Source: Odontology - April 4, 2023 Category: Dentistry Source Type: research
Curcumin nanoparticles: the topical antimycotic suspension treating oral candidiasis
In conclusion, nanocurcumin has a good antifungal effect as nystatin, however, its therapeutic efficacy takes a longer time to appear than nystatin. The enhanced bioavailability of curcumin at the nanoscale qualifies this nano-herb as a promising alternative therapy for o ral candidiasis, evading nystatin-associated morbidity. (Source: Odontology)
Source: Odontology - March 17, 2023 Category: Dentistry Source Type: research
Adhesive sonic agitation improves bonding durability to class-II cavity preparation
AbstractThe purpose of this study was to evaluate the effect of adhesive sonic agitation on resin –dentin micro-tensile bond strength (µTBS) and interfacial morphology at the gingival wall of class-II cavity preparation. Seventy-two molars with prepared class-II cavities were divided into six groups (n = 12) according to the bonding mode; etch-and-rinse (E&R) or self-etch (SE) and application protocol of the universal adhesive (UA) employed (Clearfil Universal Bond Quick, Kuraray Noritake); following the manufacturer instructions (MI), manual agitation for 20  s (20s), or sonic agitation for 20 s using a modif...
Source: Odontology - March 17, 2023 Category: Dentistry Source Type: research
Compressive strength evaluation of thin occlusal veneers from different CAD/CAM materials, before and after acidic saliva exposure
AbstractIn the present study are depicted valuable observations for practitioners, obtained from an in vitro study which aims to evaluate the compressive strength of occlusal veneers fabricated from 3 type of restorative materials, before and after 1  month of acidic artificial saliva exposure (pH = 2.939). In this context, 90 extracted human molars were prepared to receive computer-aided design/computer-aided manufacturing (CAD/CAM) occlusal veneers. The restorative materials considered in this study were: Cerasmart; Straumann Nice and Tet ric CAD. The occlusal veneers were designed, milled and cemented with an adhes...
Source: Odontology - March 17, 2023 Category: Dentistry Source Type: research
Relationship between age and occlusal force in adults with natural dentition
This study aimed to clarify the relationship between age and occlusal force in adults with natural dentition. A total of 385 adults (180 males and 205 females) with natural dentition participated in this study. Subjects were asked to perform maximum clenching for approximately 3  s, and the occlusal forces on both sides and habitual chewing side were calculated using a dental prescale. Regression analysis was performed by sex with occlusal forces on both sides and habitual chewing side as the dependent variable and age as the independent variable. In addition, all subjects were divided into three groups: young group (20â€...
Source: Odontology - March 17, 2023 Category: Dentistry Source Type: research
Dose –response effect of Montelukast on post-extraction dental socket repair and skeletal phenotype of mice
AbstractBone metabolism and repair are directly regulated by arachidonic acid metabolites. At present, we analyzed the dose –response effects of a selective cysteinyl leukotriene receptor type-1 antagonist during bone repair after tooth extraction and on non-injured skeleton. Sixty-three 129 Sv/Ev male mice composed the groups: C—Control (saline solution); MTK2—2 mg/Kg of Montelukast (MTK) and MTK4–4 mg/Kg of MTK, daily administered by mouth throughout all experimental periods set at 7, 14, and 21 days post-operative. Dental sockets were analyzed by computed microtomography (microCT), histopathology, and immuno...
Source: Odontology - March 15, 2023 Category: Dentistry Source Type: research
The effect of different kinematics on apical debris extrusion with a single-file system
AbstractTo compare the amount of extruded debris caused by different motions using a single-file system. Fifty mandibular first molar teeth were randomized into 5 groups (n = 10) according to the motion tested: Optimize Torque Reverse (OTR), TF Adaptive Motion (TFA), continuous rotation (CR), reciprocation motion (+ 150°, −30°) (REC), and Jeni motion (Jeni). One Curve single file 25/06 (Micro-Mega, Besançon, France) was used in all experimental groups. The root canals were irrigated with 2.5% NaOCl, and the extruded debris were collected at pre-weighted glass vials. The glass vials were kept inside an incubator ...
Source: Odontology - March 14, 2023 Category: Dentistry Source Type: research
TiO2 nanotube-based nanotechnology applied to high-viscosity conventional glass-ionomer cement: ultrastructural analyses and physicochemical characterization
This study characterized TiO2 nanotube (TiO2-nt) ultrastructure and morphology, and the physicochemical impact on high-viscosity conventional glass-ionomer cement (GIC). TiO2-nt was synthesized by the alkaline method (n = 3), assessed by scanning (SEM) and transmission electron microscope (TEM), and was added (3%, 5%, 7%—in weight) to KM (Ketac Molar EasyMix™). Analyses included: SEM; Energy-dispersive spectroscopy (EDS); Raman spectroscopy (RAMAN); Setting time with Gillmore needles (ST); Color (Co); Radi opacity (XR); Water sorption (WS); and solubility (SO). Quantitative data were submitted to ANOVA and Tukey’...
Source: Odontology - March 14, 2023 Category: Dentistry Source Type: research
Macrophages immunomodulation induced by Porphyromonas gingivalis and oral antimicrobial peptides
This study aimed to analyze the immunopathological role of macrophages activated by P. gingivalis in periodontitis and suggested using antimicrobial peptides as therapeutic agents to treat the disease. (Source: Odontology)
Source: Odontology - March 10, 2023 Category: Dentistry Source Type: research
NAT10 promotes osteogenic differentiation of periodontal ligament stem cells by regulating VEGFA-mediated PI3K/AKT signaling pathway through ac4C modification
AbstractPeriodontal tissue regeneration engineering based on human periodontal ligament stem cells (hPDLSCs) provides a broad prospect for the treatment of periodontal disease. N-Acetyltransferase 10 (NAT10)-catalyzed non-histone acetylation is widely involved in physiological or pathophysiological processes. However, its function in hPDLSCs is still missing. hPDLSCs were isolated, purified, and cultured from extracted teeth. Surface markers were detected by flow cytometry. Osteogenic, adipogenic, and chondrogenic differentiation potential was detected by alizarin red staining (ARS), oil red O staining, and Alcian blue sta...
Source: Odontology - March 6, 2023 Category: Dentistry Source Type: research
Physicochemical, mechanical and biological properties of nano-calcium silicate-based cements: a systematic review
In conclusion, the evidence available for the properties of CSC particles in the nano-range is deficient —such properties could be a result of additives which may have enhanced the properties of the material. (Source: Odontology)
Source: Odontology - March 3, 2023 Category: Dentistry Source Type: research
Association between periodontal diseases and COVID-19 infection: a case –control study with a longitudinal arm
AbstractSome studies have suggested potential relationships between periodontal disease and COVID-19, explained by many possible pathological pathways. The aim of this case –control study with a longitudinal arm was to investigate this association. 80 systemically healthy individuals (apart from COVID-19) were involved in this study, divided into 40 patients who had recently had COVID-19 (test, divided into severe and mild/moderate cases) and 40 who had not had COVID -19 (control). Clinical periodontal parameters and laboratory data were recorded. Mann–WhitneyU test, Wilcoxon test, and chi-square test were performed to...
Source: Odontology - March 3, 2023 Category: Dentistry Source Type: research
Speed-sintering and the mechanical properties of 3 –5 mol% Y2O3-stabilized zirconias
AbstractEver faster workflows for the fabrication of all-ceramic restorations are of high economic interest. For that purpose, sintering protocols have been optimized for use in modern sintering furnaces, the so-called speed-sintering. However, conventional furnaces are still the most widely used equipment to sinter zirconia restorations. In this in-vitro study, we evaluated the feasibility of a speed-sintering protocol using a conventional sintering furnace to sinter different dental zirconias (stabilized with 3 Â mol% up to 5.4Â mol% Y2O3) in comparison to a conventional sintering program. The properties evaluated were Y...
Source: Odontology - March 2, 2023 Category: Dentistry Source Type: research
Vertical ridge augmentation of atrophic posterior mandible with corticocancellous onlay symphysis graft versus sandwich technique: clinical and radiographic analysis
AbstractAlveolar ridge augmentation of atrophic posterior mandibular ridge represents a challenge in oral and maxillofacial surgery to restore aesthetic and function. The aim of the study was to compare the clinical and radiographic outcomes of bone formation in atrophic posterior mandibles augmented using onlay symphysis cortico-cancellous bone block with that augmented using sandwich bone augmentation technique (Inlay). Twelve patients were selected with missing mandibular posterior teeth. CBCT were done for all patients preoperatively to assess the residual bone height, ranged between 5 and 7 Â mm from the inferior alve...
Source: Odontology - February 28, 2023 Category: Dentistry Source Type: research
