ABSTRACT
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.
Subject(s)
Dental Bonding , Dentin , Finite Element Analysis , Glass , Phosphoric Acids , Post and Core Technique , Animals , Cattle , Dentin/drug effects , Glass/chemistry , Phosphoric Acids/chemistry , Dentin-Bonding Agents/chemistry , Resin Cements/chemistry , Dental Stress Analysis , Materials Testing , Tooth Root , Glycolates/chemistry , Acid Etching, DentalABSTRACT
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.