Characteristics of the dentinária surface and Smear Layer formed by diamantados abrasive instruments: rotatory conventional, rotatory CVD and CVD for ultrasound. Study in vitro / Características da superfície dentinária e do esfregaço formado por instrumentos abrasivos diamantados: rotatório convencional, CVD rotatório e CVD por ultra-som. Estudo in vitro
AUTOR(ES)
Manoel Roberto de Paula Macedo
DATA DE PUBLICAÇÃO
2005
RESUMO
Abrasive diamond instruments are a recent development, obtained through a technique called Chemical Vapor Deposition (CVD), used in ultrasound as a new possibility in dental cavity preparation. Traditionally, cavity preparations are made with conventional abrasive rotary diamond burs (IADR), forming a thick smear layer. Upon the development of new adhesive systems, it has become very important to know the quality and thickness of the smear layer, as well as the dentin topography produced after preparati on. For this purpose, we conducted an in vitro evaluation of the drilled surface and the smear layer produced in dentin after instrumentation. Twenty-four (24) samples were divided into four (4) groups: (group 1 samples prepared with IADR, group 2 samples prepared with rotary CVD, group 3 samples prepared with Tangential ultrasound -guided CVD, and group 4 groups prepared with Impact ultrasound-guided CVD). After the dentin drilling described, the samples were dehydrated and adequately prepared for SEM observation. A qualitative analysis conducted by SEM microphotography yielded significant differences. The samples worked with the rotary systems (IADR and rotary CVD) showed straight, parallel grooves, with thicker smear layers and longer smear plugs. The samples submitted to ultrasound-guided drilling (Tangential CVD and Impact CVD) showed distinctive groove and contour patterns, with the lowest smear thicknesses and smear plug lengths.
ASSUNTO(S)
diamond burs ultra-som smear layer dentin dentina camada de esfregaço cvd ultrasound cvd ponta diamantada
