Polymerization shrinkage of light-cured conventional and bulk-fill composites - The effect of cavity depth and post-curing

被引：3

作者：

Akiya, Satoshi ^{[1
]}

Sato, Kento ^{[1
]}

Kibe, Kouta ^{[1
]}

Tichy, Antonin ^{[1
,2
,3
]}

Hiraishi, Noriko ^{[1
]}

Prasansuttiporn, Taweesak ^{[4
]}

Hosaka, Keiichi ^{[5
,6
]}

Foxton, Richard M. ^{[6
,7
]}

Shimada, Yasushi ^{[1
]}

Nakajima, Masatoshi ^{[1
,5
]}

机构：

[1] Tokyo Med & Dent Univ, Grad Sch Med & Dent Sci, Dept Cariol & Operat Dent, 1-5-45 Yushima,Bunkyo Ku, Tokyo 1138510, Japan

[2] Charles Univ Prague, Fac Med 1, Inst Dent Med, Karlovo Namesti 32, Prague 12111, Czech Republic

[3] Gen Univ Hosp Prague, Karlovo Namesti 32, Prague 12111, Czech Republic

[4] Chiang Mai Univ, Dept Restorat Dent & Periodontol, Fac Dent, Chiang Mai 50200, Thailand

[5] Univ Tokushima, Dept Regenerat Dent Med, 2-50-1 Kuramoto Cho, Tokushima, Tokushima 7700042, Japan

[6] Tokyo Med & Dent Univ, Inst Global Affairs, 1-5-45 Yushima,Bunkyo Ku, Tokyo 1138510, Japan

[7] Kings Coll London, Ctr Dent Educ, Fac Dent Oral & Craniofacial Sci, London SE1 9RT, England

来源：

DENTAL MATERIALS JOURNAL | 2023年 / 42卷 / 03期

关键词：

Resin composite; Polymerization shrinkage; Cavity depth; Post-curing; Light-curing; SELF-ETCH ADHESIVES; RESIN-COMPOSITES; MECHANICAL-PROPERTIES; CONVERSION; KINETICS; TEMPERATURE; BEHAVIOR;

D O I：

10.4012/dmj.2022-210

中图分类号：

R78 [口腔科学];

学科分类号：

1003 ;

摘要：

Volumetric shrinkage (VS) of conventional, bulk-fill, and core build-up resin-based composites (RBCs) of various thickness (1-5 mm) was measured using the modified bonded-disk method with confocal laser scanning microscopy. Additionally, the bottom-to-top ratio of Vickers hardness (%VH) was measured. Conventional RBCs exhibited significantly higher VS than bulk-fill and core build-up RBCs (p<0.05). As specimen thickness increased, VS relative to volume (%VS) and difference in VS at each depth (VSdepth) decreased. For conventional RBCs, there was a significant drop in VSdepth between 1 mm and 2 mm (p<0.05), and another drop was observed between 3 mm and 4 mm (p<0.05) where %VH decreased below 90%. For bulk-fill and core build-up RBCs, VSdepth decreased significantly between 2 mm and 3 mm (p<0.05), but %VH exceeded 90% even in 5 mm deep cavities. These results indicated that post-curing contributed to lower shrinkage in deeper layers, and that conventional RBCs were not adequately polymerized at the depth of over 3 mm.

引用

页码：426 / 432

页数：7

共 36 条

[1] Impact of light intensity on the polymerization kinetics and network structure of model hydrophobic and hydrophilic methacrylate based dental adhesive resin [J].