Abstract
The aim of the present study was to compare the fracture strength and marginal adaptation of MOD cavities restored with Cention N, bonded Cention N, and resin composite, as well as to investigate the effect of cavity preparation volume on those properties. In this experimental study, 120 human maxillary premolars were randomly divided into six groups according to the type of restoration and cavity volume (n = 20): (I) conservative MOD restored with Cention N, (II) conservative MOD restored with bonded Cention N, (III) conservative MOD restored with Z250 resin composite, (IV) extended MOD restored with Cention N, (V) extended MOD restored with bonded Cention N, and (VI) extended MOD restored with Z250 resin composite. Fracture strength (MPa) was tested using a universal testing machine. To investigate marginal adaptation, polyvinyl-siloxane impressions were taken and poured with epoxy resin. Resin replicas were examined by SEM (×400) for marginal adaptation. ANOVA tests, Tukey's test, and independent t-test were used to analyze data (P ≤ 0.05). Among conservative restorations, the fracture strength of bonded Cention N was significantly greater than that of Cention N (P = 0.001), while in the extended preparations, there was no significant difference between fracture strengths of different types of restorations (P = 0.579). In terms of marginal adaptation, there was no significant difference between different types of conservative restorations (P = 0.232). However, in extended preparations, composite showed significantly lower marginal adaptation than Cention N and bonded Cention N (P = 0.004 and P = 0.045, respectively). Conservative preparations showed significantly greater fracture strength and marginal adaptation compared to extended ones in groups restored with composite. The volume of cavity preparation was shown to be effective in the materials fracture strength and marginal adaptation. Cention N showed promising results in terms of fracture strength and marginal adaptation.
Highlights
Increasing attention to esthetic dentistry has led to the widespread use of composite resins, as a direct restorative material in anterior teeth and as a potential material of choice to substitute for unaesthetic amalgam restorations in posterior teeth [1]
Cention N is a UDMA-based, self-cure material with optional additional light-curing which consists of a powder and a liquid component [7]. e liquid is composed of dimethacrylates and initiators and the powder consists of glass fillers, initiators, and pigments
To the best of the authors’ knowledge, no study has previously investigated the effect of cavity size on fracture strength and marginal adaptation Cention N restorations with or without bonding. erefore, in this study, we aimed to compare the fracture strength and marginal adaptation of MOD cavities restored with Cention N with or without bonding and resin composite and to investigate the effect of cavity size on these properties. e null hypothesis to be tested is that different cavity preparation sizes and the type of restorative material have no effect on the fracture strength and marginal adaptation of MOD restorations
Summary
Increasing attention to esthetic dentistry has led to the widespread use of composite resins, as a direct restorative material in anterior teeth and as a potential material of choice to substitute for unaesthetic amalgam restorations in posterior teeth [1]. Resistance to abrasion, and esthetic properties of composite resins have improved significantly during the last few years, their polymerization shrinkage still remains a challenge. Marginal discrepancies and microleakage [2], marginal discoloration, postoperative sensitivity, and secondary caries [3] are the consequences of polymerization shrinkage which limits composite resins application in direct restorations [4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
