Abstract
The aim of this study was to compare the clinical performance of nanohybrid composite resin in Class II restorations placed with a one-step self-etch adhesive with that of microfilled composite resin of permanent posterior molar teeth. A total of 100 participants who received Class II restorations either with nanohybrid composite resin bonded with a single step self-etch adhesive or conventional microfilled composite bonded with a single step self-etch adhesive. All restorations were evaluated by using slightly modified USPHS criteria at baseline and after 3, 6 and 12 months. The results revealed that nanohybrid composite resin showed better clinical outcome than that of the conventional microfilled composite resin restorations in respect to retention and marginal adaptation at 12 months observation period. It can be concluded that nanohybrid is superior to conventional microfilled composite resin in respect to retention, and marginal adaptation of Class II restorations of permanent molar teeth.
Highlights
The development of composite resin have replaced the amalgam by improving the adhesive bonding system and its use in both anterior and posterior restorations has been expected in operative dentistry.[1]
A total of 100 teeth were divided into two groups and 50 cavities that were restored with nanohybrid composite resin and the remaining 50 restored with conventional microfilled composite resin
Nanohybrid composite resin restoration remained intact into the cavity at baseline and 3 observation period, decreased gradually (Table I)
Summary
The development of composite resin have replaced the amalgam by improving the adhesive bonding system and its use in both anterior and posterior restorations has been expected in operative dentistry.[1] its use in larger posterior restorations is still controversial due to polymerization shrinkage and the adhesive interface is unable to resist the polymerization stresses in enamel free cavity margin.[2, 3] The large polymerization shrinkage results in improper sealing that causes microleakage, postoperative sensitivity, and recurrent caries. Developed nanofillers composite resin obtains high fracture toughness, better lasting polish, retention and aesthetics, and higher wear resistance.[6, 7] After that, modified ceramic resin composites ormocer have been introduced which contain multifunctional methacrylate alkoxysilanes for the synthesis of inorganic– organic copolymer composite materials.[8, 9, 10]
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