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Oper Dent. 1997 Jan-Feb;22(1):21-9.

Marginal adaptation of composite restorations versus hybrid ionomer/composite sandwich restorations.

Author information

1
University of Regensburg, University Clinics, Department of Operative Dentistry and Periodontology, Germany.

Abstract

The aim of this in vitro study was to compare the approximal marginal quality of composite fillings using a dentin bonding system to the marginal quality of hybrid ionomer/composite sandwich restorations. Forty-eight standardized class 2 cavity preparations were prepared in caries-free, human third molars. Twelve preparations at a time were filled either with a composite using the matching dentin bonding system, SZ (Scotchbond MP/Z100) or PP (PROBOND/Prisma TPH) or with hybrid ionomer/composite sandwich fillings VZ (Vitremer/Z100) or DP (Dyract/Prisma TPH). Margins were evaluated before and after thermomechanical loading (TCML) (5000 cycles [+5 degrees C/+55 degrees C], 72.5 N [1,7 Hz]) by quantitative scanning electron microscope analysis using an image analyzing system. Furthermore, microleakage was assessed by dye penetration before and after TCML. Statistical analysis was performed using the Mann-Whitney test at the 0.05 level of significance. SEM analysis after TCML showed significantly fewer marginal gaps at the material/dentin interface with VZ (2.2%), DP (7.3%), and PP (6.0%) compared to SZ (29.6%). After TCML, SZ showed significantly more marginal gaps at the material/dentin interface, whereas VZ, DP, and PP were not susceptible to TCML. PP showed the highest percentage in marginal swelling before (18.2%) and after TCML (15.9%), while VZ showed no marginal swelling at all. VZ showed significantly fewer marginal gaps at the composite/hybrid ionomer interface than DP. After TCML there was no significant difference in marginal gaps between the hybrid ionomer/enamel and the hybrid ionomer/dentin interface for both Vitremer and Dyract. Using the sandwich technique the Z100/enamel interface had significantly more marginal gaps than all other composite/enamel interfaces after TCML. There was no significant difference in microleakage between the test groups at the material/dentin interface. SEM analysis and dye penetration showed that hybrid ionomer/composite sandwich restorations have good marginal qualities and may be an alternative to composite restorations using a dentin bonding system.

PMID:
9227124
[Indexed for MEDLINE]

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