ABRASION AND CHEMICAL DEGRADATION OF LIGHT-CURED COMPOSITE RESIN FOR UPDATED RESIN DEVELOPMENT

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Journal of the Korean Academy of Pediatric Dentistry 2004;31(4):685-695.
Published online November 30, 2004.

ABRASION AND CHEMICAL DEGRADATION OF LIGHT-CURED COMPOSITE RESIN FOR UPDATED RESIN DEVELOPMENT

차세대 레진개발을 위한 광중합형 복합레진의 마모와 화학적 분해

양규호, 최남기, 육근영

전남대학교 치과대학 소아치과학교실 및 치의학연구소

Correspondence: ,

Abstract

The aim of this study was to evaluate the resistance to degradation and to compare the wear resistance characteristics of four composite resins in an alkaline solution. The resistance to degradation was evaluated on the basis of mass loss(%), degradation depth(μm), Si loss(ppm) and wear depth. The brands studied were Heliomolar flow, Filtek supreme, Point4, Tetric flow. The results were as follows: 1. The sequence of the mass loss was in descending order by Heliomolar flow, Filtek supreme, Point4, Tetric flow. There was significant differences among the materials except Heliomolar flow and Filtek supreme. 2. The sequence of the degree of degradation layer depth was in descending order by Filtek supreme, Heliomolar flow, Tetric flow, Point4. There were significant differences among the materials except Heliomolar flow and Tetric flow. 3. The sequence of Si loss was in descending order by Filtek supreme, Heliomolar flow, Point4, Tetric flow. There were significant differences among the materials except Point 4 and Tetric flow. 4. The sequence of maximum wear depth was in descending order by Heliomolar flow, Point4, Fillet supreme, Tetric flow and there was increasing wear depth on soaking in 0.1N NaOH solution. 5. When observed with SEM, destruction of bonding between matrix and filler was observed and when observed with CLSM, the depth of degradation layer of specimen surface was observed. There results indicate that wear and hydrolytic degradation could be considered to be evaluation factors of composite resins.

Key Words: Composite resin, Wear, Subsurface degradation, Filler