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J Korean Acad Pediatr Dent. 2012;39(1): 1-10.
Eun-young Kim, Min-Seok Kwon, Shin Kim, Tae-sung Jeong
Department of Pediatric Dentistry, School of Dentistry, Pusan National University The
Corresponding Author: Shin Kim ,Tel: 055-360-5180, Email: shinkim@pusan.ac.kr
Received: August 20, 2011;  Accepted: January 10, 2012.
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The concept of resin infiltration which was born in an innovative philosophy to arrest the incipient caries. However, the structural changes of resin infiltrated lesions have not yet explained completely. The liquid resin might contribute not only to maximizing the penetration but to deteriorating physical stability. This study was performed to examine some physical and histological features of resin infiltrated incipient carious lesions. With the specimen of resin infiltrated lesions, microhardness by nanoindentation in depth profile, morphology of resin tags were revealed after HCl dissolution, and degree of microleakage were assessed. The percentage of microhardness of surface layer and lesion body of untreated specimen to sound enamel was 64.6% and 24.6% respectively, while that of resin-infiltrated lesions was 72.1%, showing significant difference (p<0.05). The resin tags observed under SEM had relatively homogeneous length of 433(282~501) ㎛ on the average. Among 20 specimens for microleakage assessment, 13 specimens showed no leakage while 5 and 2 showed leakage into outer and inner half of lesion respectively. It was thought the infiltrant resin penetrates deeply and homogeneously into lesion body and improves its hardness with relatively good physical stability.
Keywords: Resin infiltration | Incipient caries | Microhardness | Penetration depth | Microleakage Abstract
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