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KMID : 1023820150070030257
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The Journal of Advanced Prosthodontics
2015 Volume.7 No. 3 p.257 ~ p.263
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Evaluation and comparison of the marginal adaptation of two different substructure materials
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Tahir Karaman
Sabiha Zelal Ulku
Ali Ihsan Zengingul
Sedat Guven
Veysel Eratilla
Ebru Sumer
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Abstract
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PURPOSE : In this study, we aimed to evaluate the amount of marginal gap with two different substructure materials using identical margin preparations.
MATERIALS AND METHODS : Twenty stainless steel models with a chamfer were prepared with a CNC device. Marginal gap measurements of the galvano copings on these stainless steel models and Co-Cr copings obtained by a laser-sintering method were made with a stereomicroscope device before and after the cementation process and surface properties were evaluated by scanning electron microscopy (SEM). A dependent t-test was used to compare the mean of the two groups for normally distributed data, and two-way variance analysis was used for more than two data sets. Pearson's correlation analysis was also performed to assess relationships between variables.
RESULTS : According to the results obtained, the marginal gap in the galvano copings before cementation was measured as, on average, 24.47 ± 5.82 μm before and 35.11 ± 6.52 μm after cementation; in the laser-sintered Co-Cr structure, it was, on average, 60.45 ± 8.87 μm before and 69.33 ± 9.03 μm after cementation. A highly significant difference (P<.001) was found in marginal gap measurements of galvano copings and a significant difference (P<.05) was found in marginal gap measurements of the laser-sintered Co-Cr copings. According to the SEM examination, surface properties of laser sintered Co-Cr copings showed rougher structure than galvano copings. The galvano copings showed a very smooth surface.
CONCLUSION : Marginal gaps values of both groups before and after cementation were within the clinically acceptable level. The smallest marginal gaps occurred with the use of galvano copings.
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KEYWORD
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Galvano crowns, Marginal adaptation, Laser sintered Co-Cr, Electroformed coping, Biocompatibility
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