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In vitro caries inhibition by polyacid-modified composite resins ('compomers')
B J Millar1, F Abiden, J W Nicholson
1Department of Conservative Dentistry, King's Dental Institute, London, UK. b.millar@kcl.ac.uk
Objectives:
The aim of this study was to compare the in-vitro caries inhibition of two polyacid-modified composite resins (PMCRs).
Methods:
Three standardized class V cavities were prepared in eight extracted human molar teeth. Two of these cavities in each tooth were restored with Compoglass and Dyract according to manufacturers' guidelines. A conventional glass-ionomer cement restoration (Chemfil II) was placed in the third cavity in each tooth as a control. The teeth were submerged in an acid gel (lactic acid, gelatin, thymol, pH 4.5) for 28 days and then resin embedded. Ground sections were examined at x 160 magnification for enamel surface lesion depth, dentine surface lesion depth, wall lesions and evidence of caries inhibition.
Results:
There was no significant difference between the depths of enamel or dentine surface lesions between the two compomer and conventional glass-ionomer materials. However, both PMCRs exhibited greater wall lesions than the conventional glass-ionomer material indicating less caries inhibition.
Conclusions:
These results suggest that PMCRs provide less caries inhibition than glass-ionomer cements.