Do Low-shrink Composites Reduce Polymerization Shrinkage Effects?
作者： D. Tantbirojn , C.S. Pfeifer , R.R. Braga , A. Versluis
关键词: Elastic modulus 、 Composite material 、 Stress (mechanics) 、 Shrinkage 、 Polymer 、 Deflection (engineering) 、 Materials science 、 Deformation (engineering) 、 Dental restoration 、 Composite number
摘要: Progress in polymer science has led to continuous reduction of polymerization shrinkage, exemplified by a new generation "low-shrink composites". The common inference that shrinkage stress effects will be reduced teeth restored with such restoratives lower was tested extracted human premolars. Mesio-occluso-distal slot-shaped cavities were cut and conventional (SupremePlus) or low-shrink (RefleXions, Premise, Kalore, LS) composite (N = 5). We digitized the coronal surfaces before 10 min after restoration determine cuspal deflection from buccal lingual volume change/area. also determined main properties involved (total post-gel degree conversion, elastic modulus), as well microleakage, verify adequate bonding. It shown that, due stresses, pulled inward (9-14 microns). Only Kalore LS resulted significantly tooth deformation (ANOVA/Student-Newman-Keuls post hoc, p 0.05). other two composites, despite having lowest highest total values, did not cause significant differences deflection. Deflection seemed most related combination modulus. Therefore, even for is necessarily reduced.
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