Avaliação qualitativa da infiltração marginal nas restaurações em compositos polimerizados com laser de argonio e luz halogena

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

The purpose of this study was to evaluate the marginal leakage through dye penetration, in class V composite resin restorations, comparing the conventional visible light and argon laser polymerization. Circular cavities (2mm x 1,5 mm) were prepared on the CEJ on the buccal surfaces of 114 extracted human third molars. The teeth were randomly divided into 6 groups of 19 each. Adhesive system Scotchbond MP was used for all groups, and the adhesive was polymerized by an argon laser for 5s and conventional visible light for 10s, following manufacturers recommendations. The teeth were restored with different composite resins: Charisma, Solitaire and Flowable. The argon laser polymerization lasted for 20s and the conventional visible light polymerization lasted for 40s, following manufacturers recommendations. The teeth were stored in 100% relative humidity at 37° C for 24h, after that, they were finished and polished. The specimens were thermocycled between 5Oº C and 55ºC for 2000 cycles for 1 minute dwell time, followed by imersion in a 2% methylene blue solution for 4h. The teeth were sectioned buccolingually. The microleakage was evaluated for margins of enamel and dentin/cementum and separately scored as follows : O-no microleakage; 1 microleakage 1/3 oclusal or gengival wall; 2-microleakage 2/3 oclusal or gengival wall; 3-microleakage ali oclusal or gengival wall; 4-microleakage axial wall. Statistical analysis using Kruskal-Wallis test indicated not significant differences among ali groups (a=0,05). It can be concluded that: the argon laser does not reduce microleakage when compared to conventional visible light

ASSUNTO(S)

polimerização resinas dentarias laser em odontologia

ACESSO AO ARTIGO

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