An In-vitro Comparative Stereomicroscopic Analysis and Evaluation of Marginal Accuracy in Porcelain Fused to Metal Copings Fabricated in Two Different Finish Lines Using Variant Die Materials
Introduction: Limited published information is available about the influence of preparatory designs and die materials on marginal accuracy of porcelain fused to metal copings using recently developed die materials. Aim: To detect the influence of margin geometries and dimensional accuracy of co...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
JCDR Research and Publications Private Limited
2017-01-01
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| Series: | Journal of Clinical and Diagnostic Research |
| Subjects: | |
| Online Access: | https://jcdr.net/articles/PDF/9131/21370_F(DK)_PF1(DK_NE)_PFA(DK)_PF2(SS_NE_DK).pdf |
| Summary: | Introduction: Limited published information is available about
the influence of preparatory designs and die materials on
marginal accuracy of porcelain fused to metal copings using
recently developed die materials.
Aim: To detect the influence of margin geometries and dimensional
accuracy of contemporary die materials on vertical marginal gaps
in Porcelain fused to metal coping using a Stereomicroscope
(three dimensional analysis).
Materials and Method: Two chrome cobalt alloy models of
mandibular first molars prepared to have shoulder and deep
chamfer finish lines were CAD-CAM milled. Elastomeric
impressions of these models were made in a custom tray, poured
in Type IV Gypsum(n=10) and Resin modified Gypsum(n=10)
and also packed with Epoxy resin (n=10) as a die material to
form a total of 60 samples, 30 in each group (shoulder and
deep chamfer). Wax patterns were fabricated, invested and
castings in ceramic alloy were obtained in traditional manner.
These copings were later analyzed on CAD/CAM models using
stereomicroscope.
Results: Both the designs did not exhibit significant difference
(p<0.05). Whereas, the three die materials exhibited significant
difference (p<0.05) by Two way ANOVA test and Tukey’s multiple
Post Hoc test. Results from this study showed that vertical
marginal gaps for copings fabricated on resin modified gypsum
as a die material were within the clinically acceptable range.
Conclusion: Margin geometries both shoulder and deep
chamfer have equal influence on vertical marginal gaps in metal
ceramic restorations. Copings fabricated on Epoxy resin dies
exhibited highest value of vertical marginal discrepancy, where
as least value was determined for copings constructed on dies
fabricated from resin modified gypsum. |
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| ISSN: | 2249-782X 0973-709X |