Evaluation of the surface roughness in dental ceramics submitted to different finishing and polishing methods.

Ceramic restorations have been widely used in dentistry. These restorations often require intraoral adjustment with diamond burs after their cementation causing increasing roughness of the ceramic surface. Consequently some finishing and polishing methods have been used to minimize this occurrence. The aim of this study is to evaluate the roughness of the ceramic surfaces submitted to different finishing and polishing methods. 144 specimens of VITAVM(®)7, VM(®)9 and VM(®)13 (VITA Zahnfabrik) ceramics were fabricated and submitted to grinding using diamond burs. They were then divided into 15 groups (five of each ceramic type). Groups 1, 6 and 11-positive control (Glaze); Groups 2, 7 and 12-negative control (no polishing); Groups 3, 8 and 13-polished with abrasive rubbers (Edenta), felt disc and diamond polishing past; Groups 4, 9 and 14-polished with abrasive rubbers (Shofu), felt disc and diamond polishing past; Groups 5, 10 and 15-polished with aluminum oxide discs (Sof-Lex, 3M-ESPE), felt disc and diamond polishing paste. The roughness of the samples surfaces were measured using the rugosimeter Surfcorder SE 1700 and the data were submitted to statistical analysis using ANOVA and Tukey test at a level of significance of 5 %. There was statistically significance difference between the positive control groups and the other groups in all the ceramic types. Mechanical finishing and polishing methods were not able to provide a surface as smooth as the glazed surface for the tested ceramics. To assist dental practitioners to select the best finishing and polishing methods for the final adjustment of the ceramic restorations.

Interprofessional Culinary Medicine Training Enhanced Nutrition Knowledge, Nutrition Counseling Confidence, and Interprofessional Experience.

Introduction: Culinary medicine training combining evidence-based nutrition instruction with experiential cooking application has improved nutrition knowledge, skills, and attitudes in the professional and personal lives of medical students. However, interprofessional culinary training remains largely unstudied among professional students who will be involved in collaborative patient care. The goal of this study was to evaluate the feasibility and effectiveness of an elective interprofessional culinary medicine course for students in the medical, pharmacy, social work, nursing, law, and dentistry schools at the University of Maryland, Baltimore. Methods: The interprofessional culinary medicine course was offered in-person at the teaching kitchen of the Nova Institute for Health in 2020 and virtually in 2021 during the COVID pandemic. The training featured five workshops combining instruction in a variety of popular diets, cooking a meal inspired by the diet in focus, and group discussion. Paired t tests were utilized to evaluate changes in pre-/post-training nutrition and interprofessional experience outcomes. Linear regression models were constructed to compare outcomes between in-person and virtual delivery. Results: A total of 62 students participated in the culinary medicine training. Confidence in all nutrition knowledge, skills, and attitudes, as well as interprofessional experience outcomes, improved after the training (p < 0.05). Similar improvements were noted in most outcomes with in-person and virtual delivery in linear regression modeling. Discussion: Interprofessional culinary medicine training is feasible, and virtual delivery may help enhance replicability in other settings.

In vivo assessment of the effect of an adhesive for complete dentures on colonisation of Candida species.

OBJECTIVE: Denture adhesives have long been recognised by denture wearers as a useful adjunct to denture retention and stability. The objective of the present study was to evaluate, in vivo, the effect of a denture adhesive on oral quantities of Candida species by determination of absolute counts of colony-forming units (CFU) per ml of saliva of individuals who use this denture adhesive for a period of 14 days. MATERIALS AND METHODS: Twenty-four individuals were randomised in two equal groups of 12 (test and control), with the individuals of the test group using the adhesive for 14 days. Samples of saliva were collected from all individuals on days 0 (initial), 7 and 14. Aliquots of saliva were diluted and plated in duplicate on Sabouraud dextrose agar with chloramphenicol and incubated for 37 °C for 48 h, the CFU/ml were counted in the individuals of each group and the data of each group were compared at the different time periods and analysed statistically by the non-parametric Mann-Whitney U-test (α ≤ 5%). RESULTS: There were no statistically significant differences between the test and control groups during the test periods. CONCLUSION: Within of the limitations of this study, the data suggested that the denture adhesive tested did not significantly alter the oral microbiota during the 14-day trial period.

Evaluation of an early childhood caries prevention program at an urban pediatric clinic.

PURPOSE: The purpose of this study was to evaluate a risk-based dental caries prevention program at an urban pediatric primary care clinic serving low-income residents. METHODS: A demonstration caries prevention trial lasting 26 months was conducted with 219 6- to 27-month-old children. A "prevention" group of 6- to 15-month-old children (initial visit) were compared at the end of the trial with a "comparison" group at their initial visit. The latter children were patients of the same clinic who were 12 months older (18-27 months). Preventive services included: caries-risk assessments; mutans streptococci (MS) monitoring; fluoride varnish applications; dental health counseling; referral for dental treatment, if indicated; and periodic recalls. RESULTS: Prevention group children at the last recall experienced fewer mean carious dental surfaces (0.1 vs 1.29, P=.01) and over 8-fold less MS (P=.01) than comparison group subjects at their initial visit. The number of precavitated lesions was not significantly different CONCLUSIONS: Administration of prevention measures was shown to reduce dental caries experience in low socioeconomic status infants and toddlers, and oral MS levels were a reliable indicator of future caries status. Outcomes support establishment of caries prevention programs at urban primary care pediatric clinics.

Avaliação da interface resinal dentina em restaurações classe V após condicionamento com laser de Er: YAG / Anafysis af the resinjdentin interface in class V restaratians after Er: YAG faser etching

Objetivo: O propósito deste estudo in vitro foi avaliar a interface resina f dentina de restaurações Classe V após condicionamento com laser de Er:YAG. Material e Métodos: Cento e vinte terceiros molares humanos extraídos foram divididos em oito grupos (A 1, A2, A3, M, L 1, L2, L3 e L 4) n= 15. Cavidades Classe V foram preparadas com broca na superfície vestibular. Nos grupos L 1, L2, L3 e L 4, a dentina e o esmalte foram irradiados com laser de Er:YAG (15 Jfcm2). Após o condicionamento ácido os grupos A 1, A2, L 1 e L2 foram restaurados com Prime & Bond NT® e resina composta Esthet X® e os grupos A3, M, L3 e L4 com Single Bond® e resina composta Z25()®. Os grupos A 1, A3, L 1 e L3 foram polimerizados com luz halógena e os grupos A2, M, L2 e L4 com laser de argônio. Os espécimes foram preparados para o teste de mi- croinfiltração marginal e para a análise através de microscopia eletrônica de varredura. Resultados: Houve diferenças estatisticamente significativas entre os grupos (p< 0.05). Os menores valores de microinfiltração foram encontrados nos gruposA3 (±0.40) e L4 (±0.80). As fotomicrografias dos gruposA3, L3 e L4 mostra- ram uma superfície polida e um adequado selamento entre o material e o dente. Conclusão: Este estudo sugere que um sistema adesivo composto de HEMA, etanol e água poderia ser empregado com vantagens na adesão à dentina após o condicionamento com laser de Er:YAG. No entanto, outros estudos usando diferentes formulações químicas são necessários antes de uma recomendação para uso clínico.

Objective: The aim of this study was to assess the resin f dentin interface of Class V restorations after Er:YAG laser etching. Matherial and Methods: One hundred twenty extracted human third molars teeth were divided into eight groups (A 1, A2, A3, M, L1, L2, L3 and L4) n= 15. Class V cavities were prepared with bur on the vestibular surfaces. However, in groups L1, L2, L3 and L4, dentin and enamel surfaces were irradiated with Er:YAG laser (15 Jfcm2). After acid etching groups A 1, A2, L 1 and L2 were restored with Prime & Bond NT® and composite resin Esthet X® and groups A3, M, L3 and L4 with Single Bond® and composite resin Z25()®. GroupsA 1, A3, L 1 and L3 were light cured by current visible light and groups A2, M, L2 and L4 with an argon laser. The specimens were routinely processed for the microleakage test and SEM analysis. Results: There were statistically significant differences among groups (P< 0.05). The lower microleakage values were found in groups A3 (±0.40) and L4 (±0.80). The photomicrographs of groups A3, L3 and L4 showed a smooth surface and an adequate seal between material and tooth. Conclusion: This study suggested that a hema, water/ethanol based adhesive system could be applied with advantages for the bonding to dentin after Er:YAG laser etching, but further studies using different chemical formulations are needed before clinical use can be recommended.