Journal of Capital Medical University ›› 2006, Vol. 27 ›› Issue (3): 315-317.
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Lv Yalin, Jiang Qingsong
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Abstract: Objective To study the fatigue failure characteristics of direct and indirect resin composite restorations in-vitro by using a simulator to mimic chewing.Methods Thirty extracted human molars (prepared with standardized class Ⅱcavities, not bevelled) were randomly divided into three groups (n=10): two indirect resin composite restorations groups (cemented with PermaCem-Dual and ParaCore-Dual respectively) and a direct resin composite restorations group. All the specimens were fixed on a thermocycling and mechanical loading (TCML) chewing simulator. After thermocycling and dynamic mechanical loading ( 1 000, 5 ℃/55 ℃, 1.2×106, 50 N, 1.7 Hz), the specimens were immersed in a 1% Gentian violet solution for 24 h, rinsed, and then incised in a mesial-distal direction. Section surfaces were observed with an optical microscope.Results Compared with the direct composite group, both indirect composite groups showed a significant reduction in the incidence of micro-leakage of gingival margin (P<0.05), but there was no significant difference between the two indirect groups (P>0.05).Conclusion Within the limitations of this in-vitro study, indirect resin composite restoration can tolerate more fatigue failure than the direct-placement light-cured-only composite. The resin composite inlay technique is a promising method introduced to reduce the problem of shrinkage.
Key words: resin composite, inlay, fatigue failure
CLC Number:
R781.05
Lv Yalin;Jiang Qingsong . The Fatigue Failure Study of Direct and Indirect Resin Composite Restorations[J]. Journal of Capital Medical University, 2006, 27(3): 315-317.
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https://journal03.magtech.org.cn/Jweb_sdykdxxb/EN/Y2006/V27/I3/315