Toxicity and effect of whitening toothpastes on enamel surface
Abstract This in vitro study evaluated the biocompatibility and abrasivity of whitening and conventional toothpastes. Samples of conventional (non-whitening) - Edel White Infant (EWI) - and whitening toothpastes - Edel White Whitening (EWW), Edel White CAREFORTE (EWC), Colgate Total 12 Ò Professional (C), and Oral-B Whitening (OB) - were dissolved in culture medium (0.2 g sample weight per mL). Human gingival fibroblasts (hGF) were placed in contact with different dilutions of culture media that had been previously exposed to these toothpastes. Cytotoxicity was then assessed usin g the methyl tetrazolium test (MTT) and th...
Source: Brazilian Oral Research - February 12, 2021 Category: Dentistry Source Type: research
Structural characteristics of oral health services in Brazilian Primary Health Care
This study aimed to describe the structure of oral health services in primary health care in Brazil with centers participating in the second cycle of the ‘ National Program for Improving Access and Quality of Primary Care ’ (PMAQ-AB), the largest health service evaluation program ever instituted in the country. This cross-sectional study evaluated 16,202 oral health services, regarding 22 pieces of dental equipment and 25 dental supplies. The presence of each piece of equipment/dental supply generated a score for services. The sum of these scores was compared among different regions in Brazil. Quantitative data were d...
Source: Brazilian Oral Research - February 12, 2021 Category: Dentistry Source Type: research
Three Dimensional mapping of the root apex: distances between apexes and anatomical structures and external cortical plates
This study aimed to determine the mean distances between apexes of the maxillary posterior teeth and the maxillary sinus, between apexes of the mandibular posterior teeth and the mandibular canal, and between the root apexes of all teeth and the adjacent cortical plates. A total of 800 cone-beam computed tomography (CBCT) scans (400 maxillary and 400 mandibular) were obtained from patients indicated for several treatments. The proximity between apexes and anatomical structures, and the relationship between apexes and adjacent cortical plates were assessed together with the risk of over-instrumentation. Paired-sample compar...
Source: Brazilian Oral Research - February 12, 2021 Category: Dentistry Source Type: research
Effects of clinical use of NiTi reciprocating instruments on cyclic and torsional resistance, and on roughness
Abstrac The aim of the present study was to evaluate the cyclic fatigue, torsional resistance and surface roughness of Reciproc R25 instruments in four different situations, namely as new instruments and as instruments tested after clinical preparation of one, two or three maxillary molars with four root canals. The total time required to perform each root canal preparation was recorded. Cyclic fatigue resistance was determined by the time to fracture using a customized testing device (n = 10 per group). The torsional test evaluated the torque and angle of rotation to failure according to ISO 3630-1 (n = 10 per group). The...
Source: Brazilian Oral Research - February 12, 2021 Category: Dentistry Source Type: research
Saliva as a tool for monitoring hemodialysis: a systematic review and meta-analysis
This study aimed to assess whether the reductions in serum urea and creatinine levels are different from the reductions in salivary urea and creatinine levels that occur after hemodialysis in chronic renal patients. The systematic review protocol was registered in the PROSPERO database. Eight databases were searched to identify pretest-posttest studies of chronic kidney disease patients undergoing hemodialysis, with no language or year restrictions. The JBI Critical Appraisal Tool was used to assess the risk of bias. Meta-analyses using random-effect models were conducted to compare salivary and serum correlations and to p...
Source: Brazilian Oral Research - December 18, 2020 Category: Dentistry Source Type: research
The 100 most-cited papers in oral medicine and pathology
This study aimed to analyze the 100 most-cited papers in the field of oral medicine and pathology over time, identifying the areas of more intense research. Papers in journals of oral medicine and pathology were identified using the Web of Science database. The specified research period was between 1900 and 2019. Descriptive statistics was used to analyze the data. Pearson ’ s correlation analysis was used to explore the relationships among Web of Science citations, Dimensions citations, and Altmetric Attention Score. The number of citations of an article in the top 100 most-cited papers published in 1953 or later ranged...
Source: Brazilian Oral Research - December 18, 2020 Category: Dentistry Source Type: research
Thiourethane-functionalized fillers: biological properties and degradation resistance
This study determined the effect of thiourethane-functionalized fillers (TU) on the antimicrobial properties, cytotoxicity, degree of conversion (DC), water sorption (Wsp) and solubility (Wsl) of experimental composites. TU-modified fillers were added at different ratios in experimental composites: 0 (Control-TU0), 25% (TU25), 50% (TU50), 75% (TU75) and 100wt% (TU100). The antimicrobial properties were detected through the exhaustion test and counting of Streptococus mutans colonies for biofilm formation. Cytotoxicity to human gingival fibroblasts was evaluated in three different parameters: XTT (2,3-Bis-(2-Methoxy-4-Nitro...
Source: Brazilian Oral Research - December 18, 2020 Category: Dentistry Source Type: research
Factors associated with oral health-related quality of life of institutionalized elders
In conclusion, worse OHRQoL among institutionalized elderly individuals is associated with worse self-perceived oral health and a greater swallowing threshold. (Source: Brazilian Oral Research)
Source: Brazilian Oral Research - December 18, 2020 Category: Dentistry Source Type: research
Follow-up interval for dental appointments: a randomized clinical trial with children with low caries risk
The objective of this study was to evaluate the effect of different follow-up consultation intervals on caries incidence in children with low caries risk. The study was composed of 224 children aged between 3 and 5 years and with low risk of caries. The children were randomly allocated into two groups, according to two different follow-up consultation intervals: Group 1 (G1) – 12-month follow-up interval; Group 2 (G2) – 18-month follow-up interval. All oral clinical examinations were performed by a single examiner who was previously calibrated and blinded in relation to the study groups. An external dentist provided ...
Source: Brazilian Oral Research - December 18, 2020 Category: Dentistry Source Type: research
Prescriptions of analgesics and anti-inflammatory drugs in municipalities from a Brazilian Southeast state
In conclusion, dental prescriptions of analgesics and NSAID in the BNHS were associated with socioeconomic and oral health care services ’ characteristics. (Source: Brazilian Oral Research)
Source: Brazilian Oral Research - December 18, 2020 Category: Dentistry Source Type: research
Polymorphisms of matrix metalloproteinase-7 and -9 are associated with oral tongue squamous cell carcinoma
Abstract Matrix degradation is an important event in the progression, invasion and metastasis of malignant head and neck lesions. Imbalances, mutations and polymorphisms of MMPs and their inhibitors are observed in several cancer subtypes. The aim of this study was to evaluate the association of the MMP-7 gene promoter (181 A/G) and MMP-9 (-1562 C/T) polymorphisms in oral tongue squamous cell carcinoma (OTSCC). MMP-7 (rs11568818) and MMP-9 (rs3918242) single-nucleotide polymorphisms (SNPs) were genotyped by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis in 71 cases of OTSCC. Normal t...
Source: Brazilian Oral Research - November 23, 2020 Category: Dentistry Source Type: research
Caries risk assessment in dental practices by dentists from a Brazilian community
In conclusion, CRA was not a routine procedure in daily practice among the majority of participating dentists. Specific demographic, practice and academic education characteristics were associated with performing CRA. (Source: Brazilian Oral Research)
Source: Brazilian Oral Research - November 23, 2020 Category: Dentistry Source Type: research
Effect of the application of different concentrations of EDTA on the adhesion of fiber posts using self-adhesive cements
Abstract The purpose of this study was to analyze the effect of the application of different concentrations of EDTA on the adhesion of fiber posts to root dentin using self-adhesive resin cements. After endodontic treatment, 78 single roots were randomly divided into six groups (n = 13) according to the combination of the following factors: surface dentin treatment – control (distilled water), 17% EDTA and 24% EDTA; and self-adhesive resin cement - RelyX U200 (RX); and Multilink Speed (ML). After fiber post cementation, six slices were obtained for each root. Ten roots of each group were used for bond strength (BS) and ...
Source: Brazilian Oral Research - November 23, 2020 Category: Dentistry Source Type: research
Characterization of low-cost Brazilian resin composites submitted to tooth brushing
Abstract: This in vitro study aimed to evaluate surface microhardness, roughness, color, gloss and topography of low-cost Brazilian resin composites, compared with an international one. All 120 samples (8mm ø x 2mm height) were prepared and divided into 5 groups: Ultrafill (Biodinâmica), Llis (FGM), Fill Magic (Coltene), Applic (Makira), and Filtek Z250XT (3M Oral Care). Surface microhardness (KHN) (n=10) was analyzed at two time periods: before and after simulated tooth brushing (STB). Other standar dized samples of each group (n=10) were analyzed for surface roughness (Ra), color ( Δ L, Δ a, Δ b, Δ E, Δ E00) and g...
Source: Brazilian Oral Research - November 13, 2020 Category: Dentistry Source Type: research
The unplanned and unequal expansion of Dentistry courses in Brazil from 1856 to 2020
This study analyzed the consequences of the disordered expansion of Dentistry courses on the distribution of professionals, the job market, and limitations of the National System of Higher Education Assessment (SINAES) developed as a guarantee of education quality. This observational, descriptive, and analytical study used secondary data from several official databases. The number of courses was obtained from the e-MEC registry. From the Higher Education Census, the study collected historical series of courses offered, number of candidates per open seat, number of individuals who initiated and completed the course, and inf...
Source: Brazilian Oral Research - November 13, 2020 Category: Dentistry Source Type: research
