Avaliação dos métodos para análise da microinfiltração marginal em restaurações de resina composta classe V in vitro

• Autor(a) principal: Laxe, Laísa Araujo Cortines
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14097
• topic: Dental leakage; Microscopy; Tooth preparation; Evaluation; Infiltração dentária; Microscopia; Preparo do dente; Avaliação; Cavidade dentária - Preparo; Resinas compostas; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The aim of this study is compare the results of marginal microleakage got through different images acquiring methods and measuring methods related to silver leakage in class V resin composite restorations, in vitro. Eighteen intact human pre-molars were divided into three groups, according to the instruments for cavity preparation: 1- diamond tip, number 3100, in a turbine of high-speed; 2- carbide bur, number 330, in a turbine of high-speed; and 3- diamond tip (CVD), number 82137, coupled with an ultra-sound device. Class V cavities were prepared on buccal and lingual surfaces of the teeth, with occlusal margins in enamel and gingival margins in dentin. The cavities were treated with adhesive Solobond M (VOCO) and restored with composite Grandio (VOCO) through incremental technique. The samples were stored for 24h at 37oC in water, finished and polished with Soflex (3M) discs and stocked in water at 37oC for a week. Then, the surrounding tooth surfaces were coated with nail varnish, except in the areas adjacent to the restorations. The samples were immersed in a 50% solution of silver nitrate for 24h, exposed to photodeveloping solution for 2h, and cut in the buccal-lingual direction on restoration center. These sections were polished and the extent of microleakage was ranked using a 0-3 scale through tradicional stereomicroscope, with leds one and optical microscope. The images obtained through these latest devices had its leakage area measured with aid of AxioVision software. The χ2 McNemar-Bowker test revealed statistical agreement between tradicional stereomicroscope and with leds one (p=0,809) during semiquantitative analysis, but there were significant differences between optical microscope and stereomicroscopes (p<0,001). There were good correlation between semiquantitatives and quantitatives analysis according to Spearmann s test (p<0,001). The Kruskall-Wallis test showed no statistically significant difference (p=0,174) between three experimental groups in quantitative analyse with optical microscope in enamel margins. Although there was less microleakage statistically significant in group 2 comparing with group 1 in quantitative analyse with stereomicroscope. On dentin margins there were not differences between experimental groups in the results of microleakage obtained with all methods for analysis. Finally, the method of ranked scores used in microleakage studies frequently with stereomicroscopes, is a security option for analysis of the microleakage.