A Comparative Evaluation Of The Effect Of Various Finish Lines On The Marginal Seal And Occlusal Discrepancy Of Cast Full Crowns After Cementation - An Invitro Study.
Journal Title: International Journal of Dental Science and Innovative Research (IJDSIR) - Year 2019, Vol 2, Issue 3
Abstract
Purpose of study: To compare the marginal sealing ability of the various configurations of the finish lines and its effect on the occlusal seat of the full crowns after cementation. Material and Methods: Six stainless steel metal dies were machined with finish line configuration: Ninety degree shoulder, Rounded shoulder, 45 degree sloped shoulder, Chamfer, Long chamfer and Feather edge. Five metal crowns were fabricated on each metal die. These crowns were cemented on duplicated resin dies and sectioned longitudinally. The sectioned halves were focused under stereomicroscope and the cement thickness was measured. Data obtained was statistically analysed using ‘One way variance ANOVA test’ and ‘Students unpaired t-test’. Results: The results of ANOVA test for occlusal seat (‘F’ value 932.1 and’P’ value < 0.0001) and marginal seal (‘F’ value 556.8 and ‘P’< 0.0001) were statistically significant. Feather edge, long chamfer and chamfer were superior in sealing the margins (32µ, 51µ and 107µ) followed by shoulder preparations. 90-degree shoulder (130µ), had best occlusal seat followed by 90-degree shoulder with 30-degree bevel, 45-degree shoulder, Chamfer long Chamfer, and feather edge (164µ, 164.4µ, 224µ, and 281µ). Individual unpaired t-test revealed that results where significant for all groups (P value > 0.05). Conclusion: Among all the finish lines, feather edge margin has best marginal seal but poor occlusal seat and 90-degree shoulder margin has best occlusal seat but poor marginal seal. Chamfer margin over all shows better marginal seal and occlusal seat.
Authors and Affiliations
Dr Shiv Kumar
Keywords
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