Marginal adaption and nano leakage investigation of three metal ceramic inlay designs - An invitro study
Aims and Objectives: To evaluate the influence of metal framework design on fracture strength, marginal adaptation and nano leakage of three designs of metal ceramic inlays. Materials and Methods: Three designs for metal ceramic inlays with different metal framework extension were studied: Group A - metal extension on all cavity walls, Group B- on all cavity walls but 1.5mm below cavo-surface margin, Group C- on pulpal, axial and ginigival walls. Empress 2 all-ceramic inlays were used as controls (Group D). The fabricated inlays were cemented into standardized resin teeth using adhesive resin cement. Fracture strength was measured by applying an axial load. Marginal adaptation was evaluated using duplicate technique and scanning electron microscopy. Nano leakage was evaluated in terms of silver nitrate penetration after fatigue and thermo cycling artificial aging programs. The data were statistically analyzed using standard one-way ANOVA (p<0.05). Results: The marginal adaptation of test groups A and B were significantly lower than the other groups, 70.3 µm and 71.7 µm respectively. Group A had statistically higher fracture strength value (1287 N) compared to the other test groups. Test groups C and D had the lower silver nitrate nano leakage, 115.9 µm and 101.5 µm respectively. There was a weak negative correlation between fracture strength and marginal adaptation and between marginal adaptation and nano leakage. The extension of metallic framework affects the fracture strength, marginal adaptation and nano leakage of the metal ceramic inlays. Conclusion: In conclusion, Group A had statistically higher fracture strength value (1287 N) compared to the other test groups.
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