Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/46941
Title: Post-gel polymerization contraction of "low shrinkage" composite restoratives
Authors: Yap, A.U.J. 
Soh, M.S.
Issue Date: 2004
Source: Yap, A.U.J.,Soh, M.S. (2004). Post-gel polymerization contraction of "low shrinkage" composite restoratives. Operative Dentistry 29 (2) : 182-187. ScholarBank@NUS Repository.
Abstract: This study compared the post-gel contraction of two "low- shrinkage" composites (InTen-S [IS], Ivoclar-Vivadent; Aelite LS [AL], BISCO Inc) and an ormocer (Admira [AM], Voco) to two conventional mini-filled composites (Renew [RN], BISCO; Z100 [ZO], 3M ESPE). A strain-monitoring device and test configuration were used to measure the linear polymerization shrinkage associated with the various composites (A2 shade) during and up to 60 minutes post light polymerization. Each specimen was irradiated for 40 seconds using a halogen curing light (Max, Dentsply- Caulk) with an intensity of 401 mW/cm 2. Five specimens were made for each composite. Data was analyzed using one-way ANOVA/Scheffe's post-hoc test at significance level 0.05. The linear percentage shrinkage immediately after light polymerization and at 60 minutes post light polymerization ranged from 0.10 ± 0.02 to 0.40 ± 0.02% and 0.22 ± 0.02 to 0.60 ± 0.05%, respectively. Post-gel shrinkage ranking of the materials was as follows: immediately after light polymerization - IS < AL < AM < ZO < RN and at 60 minutes post light polymerization - IS < AL = AM < ZO < RN. The shrinkage associated with IS, AL and AM was significantly lower than for ZO and RN immediately after light polymerization and at 1, 10, 30 and 60 minutes post light polymerization. The post-gel polymerization shrinkage of IS, AL and AM was significantly lower than conventional mini-filled composites.
Source Title: Operative Dentistry
URI: http://scholarbank.nus.edu.sg/handle/10635/46941
ISSN: 03617734
Appears in Collections:Staff Publications

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