Title: Scanning electron microscopic observation on changes of dentin prepared by Er,Cr:YSGG Laser and/or acid
Abstract: Objective The aim of this study was to use scanning electon microscope (SEM) to describe the changes in morphological structure of the dentin surface and to evaluate the difference in interaction patterns between dentin and resin after laser and/or acid preparation.Methods Ten dentin disks were obtained from extracted third molars. Each disk contained three cavities; one was prepared with a conventional high-speed drill and treated with ~15% phosphoric acid; one was prepared by Er,Cr:YSGG laser with water cooling; and the other was prepared by laser and treated with 15% phosphoric acid. The ten dentin disks were assigned to two groups (n=5 each). The disks in group A were prepared for morphological analysis of the dentin surface. The disks in group B were restored with flowable resin and observed under SEM after dentin-resin interface demineralization and deproteinization.Results In Group A, the conventionally prepared dentin showed open dentinal tubules, while on the dentin surface prepared by Er,Cr:YSGG laser, the open dentinal tubules were observed to be crater-like. On the dentin surface prepared by laser plus acid, the dentinal tubules were open and encircled by a white line. In Group B, the dentin-resin interface of conventionally prepared cavity showed the formation of the hybrid layer, funnel shaped resin tags and adhesive lateral branches. The interface of the laser prepared cavity did not have a hybrid layer. The column shaped resin tags were thinner, longer and denser than that of the conventionally prepared cavity. The interface prepared by laser plus acid also showed the three layer structures seeh in the conventional preps, but the hybrid layer was thin and the resin tags were columnar in shape and long, the same as in the laser prepared cavities.Conclusion The dentin prepared by Er,Cr:YSGG laser plus acid showed open dentinal tubular encircled by partially demineralized peritubular dentin. The dentin-resin interface had the hybrid layer and long resin tags with a small taper.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
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