Efficacy of flowable composite resin as stress-absorbing liners in Class I cavity restorations
10.3760/cma.j.issn.1002-0098.2013.11.006
- VernacularTitle:流动性复合树脂洞衬对Ⅰ类洞洞壁收缩应力的影响
- Author:
Xin-Yi ZHAO
1
;
Wen-Yan ZHANG
;
Shi-Bao LI
;
Ya-Ping LI
;
Xu GONG
Author Information
1. 第四军医大学口腔医学院口腔材料学教研室
- Keywords:
Composite resins;
Stress,mechanical;
Elastic modulus;
Dental cavity lining;
Polymerization shrinkage
- From:
Chinese Journal of Stomatology
2013;48(11):664-668
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the efficacy of flowable composite resin (FCR) as stressabsorbing liners in Class I cavity restorations in vitro.Methods Thirty Class Ⅰ cavities of 4 mm in diameter and 2 mm in depth were prepared in polycarbonate(PC) plates and divided into three groups,ten each.After application of an adhesive,cavities in each group were restored using one of the following methods:A:restored with Charisma without any lining of FCR; B:lined with Revolution Formula 2 twice before restoration with Charisma; C:lined with Teric Flow twice before restoration with Charisma.All cavities were observed under a photoelastic microscope and photoelastic images were recorded at 3 min and 24 h after curing and the shrinkage stresses on the cavity wall were calculated.The polymerization shrinkage(v％) of the three composite resins was measured using bonded discs method and their elastic moduli were measured according to ISO standard.Results The shrinkage stresses at 3 min and 24 h of the three methods were as follows,A:(4.93 ± 0.28),(5.87 ± 0.40) MPa,B:(4.90 ± 0.30),(5.84 ± 0.33)MPa,and C:(4.76 ± 0.28),(5.83 ± 0.37) MPa.No significant difference was found in results among different groups.The polymerization shrinkage(v％) in group A,B,and C were (2.63 ±0.04)％,(4.56 ±0.06)％,and (3.98 ±0.02)％.The elastic modulus in group A,B,and C were (9.59 ±0.65),(4.25 ±0.51),and (5.41 ±0.79) GPa.Conclusions Under present study condition,using a FCR as stressabsorbing liner under composite resin restoration does not significantly decrease the polymerization shrinkage stresses at the cavity wall.
