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- Title
Light polymerization during cavity filling: influence of total energy density on shrinkage and marginal adaptation.
- Authors
Bortolotto, Tissiana; Prando, Federico; Dietschi, Didier; Krejci, Ivo
- Abstract
The aim of the study was to evaluate the marginal adaptation and shrinkage stress development of a micro hybrid restorative composite as a function of energy density. Linear displacement and shrinkage forces were measured with custom-made devices for energies of 4,000, 8,000, 16,000 and 32,000 mJ/cm at a constant power density of 800 mW/cm. Marginal adaptation of composite restorations cured with the same energy density was evaluated before and after mechanical loading with 300,000 cycles at 70 N. The group '4,000 mJ/cm' showed the lowest shrinkage force [2.9(0.2) kg] and linear displacement [23.5(0.7) μm] but led to the worst marginal adaptation after loading [46.4(23.5) %CM] probably due to under-curing. When the maximum energy of 32,000 mJ/cm was applied, a slight increase in shrinkage forces [3.6(0.2) kg and 29.2(0.8) μm], and a slight decrease in marginal adaptation after loading [75.4(11.5) %CM] were observed, but these changes were not significantly different in comparison to groups cured with energies of 8,000 and 16,000 mJ/cm. For the resin composite tested in this study, no differences in marginal adaptation could be detected above the energy threshold of 8,000 mJ/cm.
- Subjects
DENTAL cavity preparation; ENERGY density; DENTAL fillings; PHOTOPOLYMERIZATION; DENTAL resins
- Publication
Odontology, 2014, Vol 102, Issue 2, p184
- ISSN
1618-1247
- Publication type
Article
- DOI
10.1007/s10266-013-0123-4