A STUDY ON THE MICROSCOPIC IMAGES OF DENTIN SURFACES IN PRIMARY TEETH ACCORDING TO SURFACE WETNESS AFTER ACID ETCHING

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Journal of the Korean Academy of Pediatric Dentistry 2003;30(4):545-553.
Published online November 30, 2003.

A STUDY ON THE MICROSCOPIC IMAGES OF DENTIN SURFACES IN PRIMARY TEETH ACCORDING TO SURFACE WETNESS AFTER ACID ETCHING

전남대학교 치과대학 소아치과학 교실 및 치의학연구소

오영준, 정태성, 김신

부산대학교 치과대학 소아치과학교실

Correspondence: ,

Abstract

To achieve good dentin bonding, we must obtain proper wet dentin surface. The purpose of this study was to compare dentin surface according to different wetness degree by AFM image as studying how to obtaining proper wet dentin surface. Intact recently extracted primary teeth were used in the study. The extracted teeth were stored in distilled water at 4℃ until prepared. The teeth were used to prepare 1mm thick dentin disks with exposed surfaces parallel to the occlusal surfaces. The surface of the dentin were polished with polishing disk. The sample were ultrasonically cleaned with distilled water. The sample of each group were treated by different ways. We compared dentin surface of each group by AFM image. From the experiment, the following results were obtained. 1. Acid etching in the dentin surface of primary teeth, resulted in the removal of the smear layer, which opened dentinal tubules, caused the demineralization of peritubular and intertubular dentin, and exposed a collagen-rich transition zone. 2. If the etched dentin was so dehydrated, the intertubular dentin surfaces deceased in height and the diameters of the dentinal tubules decreased slightly. 3. In the group dried with compressed air for 20 seconds at 2 cm, the dentin surfaces were too excessive dried and dehydrated. 4. In the group dried with compressed air for 3 seconds at 2 cm, dry cotton, wet cotton, microbrush and absorbent tissue paper, the dentin surfaces were properly wet.

Key Words: Wet bonding, Dentin surface, Primary teeth, Atomic force microscopy