Effect of three-dimensional print angle on integrity of interim crowns: A systematic review.

STATEMENT OF PROBLEM: Three-dimensional printing is a rapid and cost-effective method that eliminates material waste during the manufacture of indirect restorations. Parameters such as print angle significantly affect the physical properties of the printed material. Several manufacturers suggest using an angle of 45 degrees to perform printing; however, different angles have been used, and the optimum parameters are unclear. PURPOSE: The purpose of this systematic review was to compare the 45-degree print angle with other protocols and evaluate the effect of print angle on the physical and mechanical material properties. MATERIAL AND METHODS: Two researchers independently searched for relevant studies published up to June 2023 in the PubMed/MEDLINE, Scopus, Web of Science, and Lilacs electronic databases. The population, intervention, comparison, outcome (PICO) question was: "Does the 45-degree print angle promote better physical characteristics for 3-dimensionally printed interim crowns?" Studies that compared the properties of the different print angles of interim crowns were analyzed. RESULTS: Ten in vitro studies were selected for qualitative analysis. When evaluating marginal and internal fits, most studies selected the 45-degree angle, resulting in less discrepancy. The results of flexural strength analysis showed a high level of heterogeneity. The 0-degree print angle yielded better results in 3 studies, followed by the 90-degree print angle in 2 studies. The 45-degree angle yielded the highest fracture resistance value in 1 study and similar results to those of the control group (milled PMMA) in another study. CONCLUSIONS: The marginal and internal adaptation and resistance to flexure of printed interim crowns are satisfactory when a 45-degree print angle is used.

Effectiveness of different surface treatments on bond strength between 3D-printed teeth and denture base.

PURPOSE: To investigate the effects of different surface treatments and thermal cycling on the shear bond strength between 3D-printed teeth and denture bases. MATERIAL AND METHODS: For the shear bond strength (SBS) test, the specimens were the maxillary central incisors (11 × 9 × 7 mm) bonded on a cylindrical base (20 × 25 mm). The control group was heat-cured polymethylmethacrylate (PMMA) (N = 20). The printed group was divided into five subgroups (N = 20): no treatment, sandblasting with aluminum oxide (Al2O3), methyl methacrylate monomer, acetone, and adhesive with urethane dimethacrylate. Half of the samples were subjected to 2000 thermal cycling cycles, and all samples were subjected to the SBS test. The failure mode was established as adhesive, cohesive, or mixed through stereomicroscopic analysis. The surface roughness test (Sa) was performed using optical profilometry, and the rectangular specimens (14 × 14 × 2.5 mm) were divided into four groups according to the surface treatments (N = 7 per group). Paired T and Wilcoxon tests were conducted to perform comparisons within the same group. The Kruskal-Wallis and Dwass-Steel-Critchlow-Fligner post-hoc tests were conducted to compare the groups. RESULTS: Al2O3 sandblasting in the 3D-printed groups achieved high SBS values comparable to those of the control group in the thermal cycled (p = 0.962) and non-thermal cycled samples (p = 0.319). It was the only treatment capable of modifying the surface of the 3D-printed resin, thereby increasing the roughness (p = 0.016). CONCLUSIONS: Sandblasting is recommended to increase the bond strength between the tooth and denture bases.

Photodynamic therapy in the treatment of denture stomatitis: A systematic review and meta-analysis.

STATEMENT OF PROBLEM: Photodynamic therapy is widely used in dentistry, but limited evidence exists regarding its effectiveness in treating denture stomatitis. High resistance to antifungals has been reported, and photodynamic therapy could be an alternative treatment. PURPOSE: The purpose of this systematic review and meta-analysis was to evaluate whether photodynamic therapy is effective in reducing denture stomatitis. MATERIAL AND METHODS: A systematic review was conducted based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist and recorded in the prospective register of systematic reviews (PROSPERO) (CRD42020205589) to answer the population, intervention, control, outcome (PICO) question: "Is photodynamic therapy effective in the treatment of denture stomatitis when compared with the use of antifungal agents?" Electronic searches were performed in databases PubMed/MEDLINE, Cochrane library, and Web of Science for articles published until February 2021 by using the following terms: (denture stomatitis OR oral candidiasis) AND (low-level light therapy OR laser therapy OR lasers OR photodynamic therapies OR photochemotherapy) AND (antifungal drugs OR antifungal agents OR antimicrobial OR treatment). Clinical trials and randomized clinical trials, studies in the English language, and studies comparing antifungal agents with photodynamic therapy were included. RESULTS: In total, 5 articles were selected for the qualitative analysis and 3 for the meta-analysis. No significant difference was detected between antifungal therapy and photodynamic therapy in the reduction of colony-forming units on the palate. In a subgroup analysis, a significant difference was found in the reduction of colony-forming units on the palate at 15 days and at the denture surface at 30 days. CONCLUSIONS: Photodynamic therapy is effective in the treatment of denture stomatitis, but after 30 days and 15 days, the antifungals demonstrated better performance.

Does nocturnal use of a complete denture interfere with the degree of obstructive sleep apnea? A systematic review and meta-analysis.

BACKGROUND: The impact of a complete denture on obstructive sleep apnea is not well understood. Therefore, this study aimed to evaluate the relationship between nighttime use of complete dentures and obstructive sleep apnea and determine if wearing a complete denture during sleep changes the degree of obstructive sleep apnea. METHODS: This systematic review followed the notification items for Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) and was recorded in the International Prospective Registry of Systematic Reviews (PROSPERO) under number CRD42020183167. An electronic search in the PubMed/MEDLINE, Scopus, and Cochrane Library databases for articles published until September 2020 was conducted. The search strategy used the terms (complete denture OR denture OR edentulous OR edentulism) AND (quality of sleep OR sleep OR apnea OR obstructive sleep apnea). Only prospective, retrospective, controlled, and randomized clinical studies of patients wearing complete dentures, studies comparing sleep with and without the prosthesis, and studies in which patients were diagnosed with obstructive sleep apnea by polysomnography were included in the review. RESULTS: In total, four articles were selected for the qualitative and quantitative analyses. A total of 144 patients, with an average age of 60 years, were studied. The meta-analysis showed that there was no statistical difference in the apnea-hypopnea index between using and not using the prosthesis during sleep. CONCLUSIONS: The use of complete dentures during sleep does not influence the degree of obstructive sleep apnea.

Evaluation of Masticatory Function, Satisfaction, and Quality of Life Among Users of Complete Dentures Relined with Resilient Materials: A Systematic Review.

PURPOSE: To evaluate whether complete dentures (CDs) relined with long-term resilient liners (LTRLs) favor better masticatory function, satisfaction, and quality of life among completely edentulous patients compared to conventional CDs. MATERIALS AND METHODS: This review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist and was registered in PROSPERO (the International Prospective Register of Systematic Reviews; CRD42021258700). The population, intervention, comparison, and outcome (PICO) purpose was to determine whether CDs relined with LTRLs favor better masticatory function, satisfaction, and quality of life among completely edentulous patients when compared to CDs. Searches were performed in the PubMed/MEDLINE, Embase, Scopus, Lilacs, BBO, and OpenGrey databases. Manual searches were also performed to identify additional primary studies. RESULTS: Overall, 3,953 articles were found. After removing duplicates, reading the articles, and applying the inclusion and exclusion criteria, 15 articles were selected for qualitative analysis, totaling 422 patients with follow-up periods ranging from 1 week to 3 years. Among these, 8 studies assessed masticatory function using different methods, 2 assessed satisfaction, 1 assessed quality of life, and 4 assessed more than one outcome. Through qualitative analysis, LTRLs showed satisfactory results in most studies when compared to CDs in relation to masticatory function, satisfaction, and quality of life. CONCLUSIONS: LTRLs favor better masticatory function, satisfaction, and quality of life among completely edentulous patients compared to CDs.

Influence of addition of zirconia on PMMA: A systematic review.

The objective of this systematic review is to evaluate the effect of the incorporation of zirconia (ZrO2) particles on the mechanical properties of PMMA (polymethyl methacrylate), and to establish which characteristics of this material yield the best results aiming their biomedical applicability. This study was carried out in accordance with the Items of Preferred Reports for Systematic Reviews and Meta-Analyzes (PRISMA) and is registered in PROSPERO under registration number: CRD42018095801. The searches were carried out in the PubMed, MEDLINE, Scopus and Cochrane Library databases for articles published up until April 2018. After the different stages of the article selection process, eight articles were selected for qualitative and quantitative analysis. All were in vitro studies, totaling 536 evaluated samples. The concentrations of zirconia ranged from 0.5% to 20% and the particle sizes were between 15 nm and 10 µm. The incorporation of zirconia particles did not increase the flexural strength of PMMA in only one study. While the concentration of zirconia influences PMMA, the type of acrylic resin, size, and silanization of zirconia particles did not influence the results. Thus, the addition of zirconia particles showed a positive effect on PMMA enhancing their use in the medical and dental field, especially when certain anatomical areas requires higher strength of the materials, providing longevity for the rehabilitation.

Relationship between bariatric surgery and dental erosion: a systematic review.

BACKGROUND: Bariatric surgery can have several oral repercussions, including tooth erosion due to decreased salivary flow associated with the action of acidic pH and behavioral modifications in the diet that lead to the dissolution of mineralized dental tissues. OBJECTIVES: This systematic review aimed to evaluate whether bariatric surgery presented a greater risk of dental erosion. SETTING: Dentistry School, Pernambuco University, Camaragibe, Pernambuco, Brazil. METHODS: This review was based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyzes (PRISMA) and registered at the International Prospective Registry of Systematic Reviews (CRD42019124960). A search was performed in the PubMed/MEDLINE, Web of Science, and Cochrane Library databases using the following descriptors: "dental erosion OR tooth wear OR oral health OR dental wear OR tooth erosion OR salivary flow AND bariatric surgery OR gastrectomy OR obesity surgery". RESULTS: The review included 553 articles (after exclusion of duplicates) submitted for title and abstract reading, of which 24 were selected for full text analysis. Five articles fulfilling the eligibility criteria were included in the qualitative and quantitative analysis review. Because of high heterogeneity of the studies, meta-analysis could not be performed. CONCLUSIONS: Based on the review, we concluded that patients undergoing bariatric surgery had a higher incidence of dental erosion. All studies presented a high degree of dental erosion in patients submitted to bariatric surgery (P < .05).

Complications with PMMA compared with other materials used in cranioplasty: a systematic review and meta-analysis.

Polymethyl methacrylate (PMMA) has been considered a suitable material for cranioplasty. However, no consensus has been reached concerning the best material for cranioplasty with regard to minimizing complications. Thus, this systematic review and meta-analysis aimed to compare the complication rates of PMMA with those of autologous bone and titanium mesh. This review was registered with PROSPERO (CRD42016042725). Systematic searches were conducted on PubMed/MEDLINE, Scopus, and Web of Science. The focus question was, "Do PMMA prostheses used in cranioplasty have complications rates similar to those of autologous bone and titanium mesh?" A meta-analysis of complication rates was performed on the basis of dichotomous outcomes assessed by risk ratio (RR) with corresponding 95% confidence intervals (CI). From 1014 data sources, 11 articles were selected according to eligibility criteria. These articles involved 1,256 individuals and 1,278 cranioplasties using autologous bone (n = 408), PMMA (n = 379), or titanium (n = 151). The follow-up period ranged from 63 days to 54.3 months. No difference was observed between the complication rates of PMMA and autologous bone (p = 0.94; RR, 0.98; 95%CI, 0.54-1.75) or between PMMA and titanium (p = 0.38; RR, 1.59; 95%CI, 0.57-4.48). Sub-analysis of the reasons for craniotomy (trauma/non-trauma) was conducted, which revealed no significant difference (p = 0.91; RR, 0.95; 95%CI, 0.37-2.42). The meta-analysis indicated that the use of PMMA yields complication rates that are near those of autologous bone and titanium mesh.

Complications with PMMA compared with other materials used in cranioplasty: a systematic review and meta-analysis

Abstract Polymethyl methacrylate (PMMA) has been considered a suitable material for cranioplasty. However, no consensus has been reached concerning the best material for cranioplasty with regard to minimizing complications. Thus, this systematic review and meta-analysis aimed to compare the complication rates of PMMA with those of autologous bone and titanium mesh. This review was registered with PROSPERO (CRD42016042725). Systematic searches were conducted on PubMed/MEDLINE, Scopus, and Web of Science. The focus question was, "Do PMMA prostheses used in cranioplasty have complications rates similar to those of autologous bone and titanium mesh?" A meta-analysis of complication rates was performed on the basis of dichotomous outcomes assessed by risk ratio (RR) with corresponding 95% confidence intervals (CI). From 1014 data sources, 11 articles were selected according to eligibility criteria. These articles involved 1,256 individuals and 1,278 cranioplasties using autologous bone (n = 408), PMMA (n = 379), or titanium (n = 151). The follow-up period ranged from 63 days to 54.3 months. No difference was observed between the complication rates of PMMA and autologous bone (p = 0.94; RR, 0.98; 95%CI, 0.54-1.75) or between PMMA and titanium (p = 0.38; RR, 1.59; 95%CI, 0.57-4.48). Sub-analysis of the reasons for craniotomy (trauma/non-trauma) was conducted, which revealed no significant difference (p = 0.91; RR, 0.95; 95%CI, 0.37-2.42). The meta-analysis indicated that the use of PMMA yields complication rates that are near those of autologous bone and titanium mesh.

Conhecimento sobre uso, conservação e higienização de próteses totais em população desfavorecida socioeconomicamente assistida por um projeto de extensão universitária / Knowledge of use, maintenance and cleaning of dentures in socioeconomically disadvantaged population assisted by a university extension project

Introdução: a prótese dentária total é um órgão artificial que deve promover a saúde e a qualidade de vida. O modo de uso, conservação e higienização é parte fundamental para o sucesso e longevidade da mesma. Uma ferramenta que parece ser eficaz na detecção e disseminação desse tipo de informação é a extensão universitária. Objetivo: analisar o nível de conhecimento sobre o uso, conservação e higienização de próteses totais em uma população de baixa renda, através de estudo epidemiológico transversal. Métodos: a amostra de conveniência foi composta por 37 usuários de próteses totais atendidos em uma ação do programa de extensão universitária Resgatando Sorrisos da Universidade de Pernambuco, que promove ações terapêuticas e informativas sobre as áreas de prótese dentária, dentística, patologia e pacientes com necessidades especiais. Após assinatura do termo de consentimento livre e esclarecido (TCLE), foram coletadas informações sociodemográficas e sobre hábitos de uso e higiene das próteses, através de um questionário aplicado por pesquisadores em ambiente reservado. Os dados foram interpretados por meio de análise descritiva e analítica entre as variáveis com nível de significância considerado, p < 0,05. Resultados e Discussão: dos pacientes, 70,27% dormem com as próteses; sobre frequência de higienização, 43,2% relatam fazer pelo menos 3 vezes ao dia, sendo o uso da escova e creme dental o método mais utilizado (83,78% - 31 entrevistados); características como bases e dentes desgastados, presença de biofilme/tártaro foram encontradas em mais 50% das próteses totais. Não foi observada nenhuma correlação estatisticamente significativa entre as variáveis (p>0,05). Conclusão: o nível de conhecimento sobre o uso, conservação e higienização de próteses totais da população estudada precisa ser melhorado, uma vez parte da população ainda apresenta hábitos de uso e higiene de próteses totais inadequados.(AU)

Introduction: the dental total prosthesis is an artificial organ that should promote health and quality of life. The way of use, conservation and hygiene is fundamental for the success and longevity of it. One tool that seems to be effective in detecting and disseminating this type of information is activities of University extension. Objectives: to analyze the level of knowledge about the use of complete sets of dentures and their conservation in a low-income population through a cross-sectional epidemiological study. Methods: This research had a convenience sample of 37 users of complete sets of dentures. Datawas collected using a questionnaire applied by two trained examiners. The data were interpreted via descriptive and statistical analysis (tests of Kruskal-wallis e Kolmogorov ­ Smirnov/ p =0,05). Results: The average income of the sample was R$ 668.00. The average time of denture use was 7.3 years; 70.27% of the patients sleep with their dentures, and 83.78% of them sanitize the dentures with a toothbrush and toothpaste. Conclusion: Regarding the variables association, we noticed tendencies yet to be explored in the habits of the complete denture wearer. Moreover, we conclude that the population's level of knowledge on the subject needs to be improved. Thereby, once these conditions are detected and transmitted to government officials, the extension project through the research tool will be able to assist government's course of action regarding oral health.(AU)

Impacto de uma experiência extensionista na formação universitária / Impact of an extension experience in university education

Este estudo teve como objetivo analisar o impacto do projeto de extensão universitária, Resgatando Sorrisos, na formação de estudantes do curso de Odontologia da FOP - UPE, nos anos de 2013 e 2014. Foram utilizados 02 questionários em momentos distintos, tendo como amostra 71 alunos. Foi utilizado o teste de hipótese estatística Wilcoxon para comparar as respostas de antes e depois da ação. Diante da elevada frequência de respostas, como "muitíssimo" e "bastante", observamos um alto grau de aceitação e entendimento da importância do projeto na formação do aluno, assim como no que se refere à capacidade de mudança que o projeto pode causar na vida dos pacientes e sua possível aplicabilidade no sistema público de saúde, dentre outras questões. Contudo, observa-se no ano de 2014 em quesito referente ao grau de expectativa inicial e satisfação final do projeto, uma diferença estatística entre a ida e a volta, p=o,o1. Conclui-se que os alunos apresentam um entendimento positivo em relação à ação extensionista, considerando-a importante para sua formação profissional e pessoal... (AU)

The aim of this study was to analyze the impact of the University Extension Project, ResgatandoSorrisos, in the graduation process of students of Dentistry course FOP - UPE in the years of 2013 and 2014. There were 02 questionnaires used, at different times, with a sample size 71 students. Wilcoxon statistical hypothesis test was used to compare responses before and after the action. Such high frequency responses of "vital" and "enough", a high degree of acceptance and understanding of the importance of the project in the formation of the student was observed, as well as the capacity of a change that the project may cause in the lives of patients and its possible applicability in the public health system, among other issues. However, in 2014, there was a statistical difference between the outward and return (p = o, o1) in a question referring to initial degree of expectation and ultimate satisfaction of the project. It was concluded that students have a positive understanding about the extension action, and they consider it important for their professional and personal training... (AU)