Aspects of glass and hybridization protocols for bonding of fiber posts to root dentine.

This study evaluated bond strength of glass fiber posts to root dentin using push-out (PO) and diametral compression (DC), testing glycolic acid as a conditioner and varying dentin moisture. An additional aim was to test whether DC can be an alternative test to PO for bond strength assessment. Eighty bovine teeth were divided into eight groups (n = 10) defined by the use of either 37% glycolic acid or 37% phosphoric acid (PA) on moist or wet dentin before bonding with either Adapter SingleBond/RelyX ARC or One Step Plus/Duo-Link Bisco. Each tooth provided discs with an internal diameter of 2 mm, external diameter of 5 mm, and height of 2 mm, which underwent PO and DC. Finite element analysis (FEA) was carried out on 3D models. When analyzing PO results through linear regression, the highest values of bond strength were observed using glycolic acid on wet dentin in the cervical and middle thirds of the teeth. Analyzing DC results, the only statistical influence on values was the dental thirds. The scatterplot of the DC results and the PO bond strength values indicated no relationship between the results of the two tests (r = 0.03; p = 0.64). PO test detected more sensitive changes in bond strength values than DC.

Fatigue and marginal adaptation of bulk fill restoratives: Effect of the layering technique and cavity dimension of extensively damaged teeth.

OBJECTIVES: To evaluate the effect of layering technique and cavity dimension on the fatigue behavior and marginal adaptation of bulk fill (BF) restorations in extensively damaged teeth. METHODS: Seventy-two premolars received class II cavities (MOD) followed by endodontic treatment. Half sample had 1/3 of their palatal cusp removed. Teeth were restored using three techniques: (I) incremental, with conventional resin composite (RC); (C) combined, using BF flow and RC, (B) bulk fill, with regular BF. Specimens were subjected to fatigue (80 N, 2 Hz, 37° C water) for 1 million cycles (n = 12). The test was interrupted every 250,000 cycles to evaluate tooth integrity, restoration fracture and adaptation using FDI criteria. Images of the proximal surfaces were obtained before and after the cycling to measure the gap. Restoration fatigue survival and success were analyzed using Weibull distribution and Maximum Likelihood Estimation. Gap thickness was analyzed with Kruskal-Wallis and Student-Newman-Keuls tests (α = 0.05). RESULTS: For the survival analysis, Weibull modulus (ß) and characteristic lifetime (η) were similar among groups. Yet, for the success analysis, in which only restorations that were free of technical complications were ranked as success, the bulk-fill technique resulted in higher ß, while the combined technique produced restorations with higher η, for teeth that had their cusp removed. C-technique also resulted in smaller gaps than I and B. SIGNIFICANCE: The effect of the layering technique on the success of restorations was dependent on the cavity extension. The combined technique favors the adaptation and the longevity of extensively damaged teeth.

The role of asthma in caries occurrence - meta-analysis and meta-regression.

Objective: We aimed to conduct a systematic review of the literature regarding the association between asthma and caries, assess the effect of asthma on the occurrence of caries in primary and permanent dentitions, and determine factors that could affect the estimates of this association. Data source: We used the following databases: PubMed, Web of Science, SCOPUS, and LILACS/BVS, for the literature review. Study selection: We included observational studies that investigated the association between asthma and dental caries, excluding studies with syndromic patients, literature reviews, case reports, and in vitro and in situ studies. A meta-analysis was performed to estimate a pooled effect, and meta-regression was conducted to determine study factors that could affect the estimates. Results: From 674 studies initially identified, 40 fulfilled the inclusion criteria, and 36 of these were used in the meta-analysis. Odds ratio (OR) for the pooled effect was 1.45 (95% confidence interval (CI): 1.22-1.72; I2, 71.8%; p < 0.001) and 1.52 (95% CI: 1.34-1.73; I2, 83.1%; p < 0.001) for primary and permanent dentitions, respectively. In addition, a small proportion of the heterogeneity was attributed to included factors in the meta-regression (primary dentition, 10.7%; and permanent dentition, 3.1%). Conclusions: This study provides reliable and robust evidence that emphasizes the impact of asthma on the occurrence of dental caries in both, primary and permanent, dentitions. The findings provide useful data for recommending that dentists and physicians collaborate to establish the control for both diseases in a multidisciplinary manner.

Estudo dos traumatismos alvéolo-dentários em pacientes atendidos em um Setor de Cirurgia e Traumatologia Buco-Maxilo-Facial / Study of dentoalveolar trauma in patients treated at an Oral and Maxillofacial Surgery

Objetivo: Avaliar o perfil epidemiológico dos pacientes que sofreram traumatismos alvéolo-dentários em dentes permanentes, identificando também o tipo de trauma, os dentes mais atingidos e as causas mais frequentes. Métodos: A amostra foi constituída por todos os prontuários de pacientes atendidos em cinco anos, no Departamento de Cirurgia da Faculdade de Odontologia de Pelotas, totalizando 308 casos e 793 dentes traumatizados. Os dados obtidos foram tabulados em uma planilha e analisados estatisticamente. Resultados: A faixa etária prevalente foi dos 13 aos 19 anos (32,7%); 74,6% dos traumatismos ocorreram entre pessoas do sexo masculino; a causa mais comum foram os acidentes ciclísticos (23,3%); os tipos de trauma mais frequentes foram a avulsão (17,2%) e a fratura coronária nãocomplicada(17,2%) e os dentes mais acometidos foram os incisivos centrais superiores (66,7%).Conclusão: Foi possível concluir que, nesta pesquisa, a distribuição dos traumatismos foi muito similar a maioria dos estudos publicados, no entanto,em relação à variável causa constatou-se algumas características loco-regionais, reforçando a importância de estudos epidemiológicos para o desenvolvimento de condutas preventivas e terapêuticas específicas para os serviços de saúde.

Objetive: The present study aimed to evaluate the epidemiological profile of patients with traumatic dental injuries in permanent teeth, as well as to identify the type of trauma, the teeth most affected and the most frequent causes of dentoalveolar trauma. Methods: The sample comprised all of the dental records of patients treated at the Oral and Maxillofacial Surgery Department at the Faculty of Dentistryat the Federal University of Pelotas, in the Brazilian state of Rio Grande do Sul, over a five-year period, totaling 308 cases and 793 teeth with traumatic injury. The data were evaluated statistically. Results: The results obtained demonstrated that the most prevalent age group was 13-19 (32.7%); males were affected in 74.6% of injuries; the most common etiology was cycling accidents (23.3%); the most frequent types of trauma were avulsion (17.2%) and non-complicated crown fracture (17.2%); and the most affected teeth were the maxillary central incisors (66.7%). It was concluded that the distribution of trauma injuries, in this paper, is very similar to that presented in most of the published studies. However, with regard to the etiology variable,some local/regional characteristics were found, reinforcing the importance of epidemiological studies for the development of preventive and therapeutic methods specific to the health service.