Polymerization shrinkage and contraction stress of novel low shrinking dental composite resin
10.3760/cma.j.issn.1002-0098.2012.s1.046
- VernacularTitle:新型环氧树脂聚合体积收缩率及聚合收缩应力初探
- Author:
Yun-Cong LI
1
;
Xiang SUN
;
Jie XIONG
;
Ji-Hua CHEN
Author Information
1. 西安交通大学医学院附属口腔医院修复科
- Keywords:
Epoxy resins;
X-ray microtomography;
Stress,mechanical
- From:
Chinese Journal of Stomatology
2012;47(z1):200-203
- CountryChina
- Language:Chinese
-
Abstract:
Objective To determine whether a new dedicated adhesive system employing a silorane composite exhibits low shrinking properties than does conventional methacrylate-based composites.Methods The following materials were used:group A:Xeno Ⅲ-TPH,group B:Clearfil SE bond-Clearfil Majesty Posterior,and group C:the FiltekTM silorane system.Polymerization volumetric shrinkage and contraction stress development were measured using a micro-CT instrument and a tensilometer.Results The volumetric shrinkage of the resin composite/adhesive combinations were 3.38％ ± 0.17％ (group A),1.95％ ± 0.37％ (group B) and 1.05％ ±0.09％ (group C) 30 min after light curing respectively.Group C had the lowest volumetric shrinkage (P ＜0.001),followed by group B,and group A.The contraction stress of the materials were (3.04 ± 0.26) MPa(group A),(3.49 ± 0.46) MPa (group B),and (1.54 ± 0.15) MPa (group C) respectively.The lowest contraction stress was observed in group C at 30 min during the stress test (P ＜ 0.001).Conclusions The silorane composite and dedicated adhesive system exhibited excellent characteristics of low volumetric shrinkage and contraction stress development compared to conventional methacrylate-based composites.
