Assuntos
Planejamento de Prótese Dentária , Técnica para Retentor Intrarradicular/instrumentação , Resinas Compostas/química , Corrosão , Retenção em Prótese Dentária , Cavidade Pulpar/ultraestrutura , Elasticidade , Estética Dentária , Humanos , Cimentos de Resina/química , Estresse Mecânico , Propriedades de Superfície , Dente não Vital/patologiaRESUMO
In a survey published in 1994, it was reported that nearly 30% of dental office curing lights had an intensity output (power density) of < 200 mW/cm2. This study was designed to examine the types of curing lights and the adequacy of the intensity output in the same localities after 10 years. A total of 161 curing lights in 65 dental offices located in 2 metropolitan areas in Texas were examined for the following variables: types of light, power density, resin build-up on the tips, and size of the tips. Two new radiometers were used to measure the outputs. The average intensity output for each light was placed in 5 categories ranging from < 150 mW/cm2 to > 500 mW/cm2. Of 161 lights examined, 127 (78.9%) were halogen, 22 (13.6%) were lightemitting diodes (LEDs), and 12 (7.4%) were plasma arc curing (PAC) lights. The intensity outputs (mW/cm2) of all examined lights were placed into 5 groups: (1) < 149 = 1.8% of lights; (2) 150 to 249 = 8.6%; (3) 250 to 349 = 6.2%; (4) 350 to 499 = 18.6%; and (5) >500 = 64.0%. Build-up on the tip was: none (23%), light (49.7%), moderate (12.4%), and heavy (13.7%). A comparison of the results of this study with the 1994 survey report shows an overall improvement in the intensity output in dental offices. LED and PAC lights constituted 21.2% of curing lights in this survey.
Assuntos
Equipamentos Odontológicos , Luz , Resinas Compostas/efeitos da radiação , Halogênios , Transição de Fase , Radiometria , Semicondutores , XenônioAssuntos
Condicionamento Ácido do Dente/métodos , Colagem Dentária , Porcelana Dentária/química , Silicatos de Alumínio/química , Resinas Compostas , Cristalização , Análise do Estresse Dentário , Géis/química , Ácido Fluorídrico , Teste de Materiais , Resistência ao Cisalhamento , Dióxido de Silício , Fatores de Tempo , ZircônioRESUMO
Repairing porcelain intraorally allows clinicians to provide their patients with a conservative means of treating fractured or debonded restorations. This requires, however, the etching of both porcelain and tooth structure with etching solutions. It is thus relevant to understand the effect that different etching procedures have on shear bond strengths of composite resins to both dentin and enamel structures. Based on the results of this investigation, the authors recommend isolation of tooth structures and the etching of porcelain with hydrofluoric acid.
