Restorative Dentistry and Endodontics
- Volume 20 Issue 2
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- Pages.463-486
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- 1995
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- 2234-7658(pISSN)
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- 2234-7666(eISSN)
ELECTRON MICROSCOPIC STUDY OF RESIN-DENTIN HYBRID ZONE PRODUCED BY THE MOISTENING OF ACID CONDITIONED DENTIN SURFACE
산 표면처리 후 상아질 표면의 습윤이 하이브리드층 형성에 관한 전자현미경적 연구
- Lee, Kwang-Won (Department of Conservative Dentistry, College of Dentistry, Seoul National University) ;
- Lee, Myung-Jong (Department of Conservative Dentistry, College of Dentistry, Seoul National University)
- Published : 1995.09.10
Abstract
The effect of moistening and air-drying of acid-conditioned dentin before priming on the formation of resin-dentin hybrid zone was investigated, Freshly extracted human molars were used and divided at random into 5 groups, Groups 1 - 3 consisted of specimens conditioned with 10 % phosphoric acid for 20 seconds; Group 1 served as a control in which the conditioned dentin was simply blot-dried with a damp facial tissue; Group 2 was air dried for 30 seconds ; Group 3 was air dried for 30 seconds and immediately remoistened for 10 seconds with air-water syringe. and then the specimen was blot-dried with a damp facial tissue. Groups 4-5 were not acid conditioned ; In group 4, the smear layer on the dentin was blot dried before primer placement; Group 5 was air dried only for 30 seconds, The acetone-based primer and bonding agent of All Bond 2 (Bisco. Inc., USA) and composite resin (Z-100, 3M Dental products, USA) were applied for acid conditioned dentin and non-conditioned dentin. The morphologic ultrastructure of resin-dentin hybrid zone was examined by the use of SEM and TEM. and the existence of inorganic material and analysis of Ca/P weight-percent ratio in the resin-dentin hybrid zone were revealed by the EDAX, The results were as follows : 1. In the moistened specimens from acid-conditioned groups, the resin penetrated about 3-