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In vitro Enamel Demineralization and The Marginal Gap of Simulated Cast Restorations With Three Different Cements
Author(s) -
Wu Ynlow H.,
Hutton John E.,
Marshall Grayson W.
Publication year - 1997
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.1997.tb00074.x
Subject(s) - demineralization , enamel paint , dentistry , materials science , glass ionomer cement , cement , molar , composite material , medicine
Purpose This study investigated 1) the relationship between marginal gap sizes and enamel demineralization, and 2) the influence of three cements on this enamel demineralization. Materials and Methods Horizontal sections of 60 noncarious, freshly extracted human third molars were randomly assigned to one of four groups. Simulated cast restorations were attached to the specimens with 1) zinc phosphate cement, 2) glass ionomer cement, 3) composite resin cement, or 4) no cement (control). The tooth/restoration gaps were controlled at 51, 102, and 204 μm. The specimens were incubated for 16 weeks in buffered lactic acid gelatin to induce demineralization. Photomicrographs were obtained from sections of each sample using a polarized light microscope. Three evaluators measured wall and primary enamel lesion depths allowing for the determination of a demineralization ratio (DR). Data were analyzed by repeated‐measures ANOVA (α= 0.05). Results The between‐evaluator effects were not significant. All evaluators agreed that DR was significantly related to cement ( p = .0001) but not to marginal gap size. The resin cement had the smallest DR (0.7 ± 0.3), and the control group had the greatest (4.4 ± 2.0). Conclusions The presence of any one of the three investigated cements resulted in decreased demineralization. The amount of demineralization was unaffected by marginal gap size.