Preheating effect on polymerization shrinkage of composites Restoration (in vitro comparative study)
Authors
Background: this vitro study aims to evaluate and compare the effect of preheating on polymerization shrinkage among three different filler size composites which include Filtektm Z250 micro hybrid, Z250xt Nano hybrid and nanocomposite Z350xt. in Class II cavity preparation. Materials and methods: 72 maxillary 3rd molars with class II cavities preparations. according to material used the samples were divided into three groups: group A (FiltekZ250 micro hybrid). Group B(Z250xt Nano hybrid). Group C (nanocomposite Z350xt), each group were divided according to temperature of composite into 2 subgroups of 12 teeth: Group A1 composite restoration at room temperature(24±1˚C), A2 composite restoration at preheated temperature(55±1˚C). polymerization shrinkage was estimated after immersion in 2% methylene blue for 24 hrs. Results: the least score of polymerization shrinkage were in Group B( Z250xt Nano hybrid) and Group C (Z350xt nanocomposite) especially in occlusal margin. While Group A( Z250 micro hybrid) had greater scores of shrinkage in cervical margin. Conclusions: Generally, preheating decreased polymerization shrinkage in all groups of composites, but Preheating decreased the polymerization shrinkage effectively in Group A (Z250 micro hybrid) more than Group B (Z250xt Nano hybrid) and Group C (Z350xt nanocomposite) polymerization shrinkage. The scores of polymerization shrinkage varied with different material, margin and temperature for all groups.
Keywords:
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- Published: 2025-03-10
- Issue: Vol. 8 No. 1 (2025): APPLIED MEDICAL SCIENCE
- Section: Articles
