MARGINAL ADAPTATION OF THE THREE INDIRECT CROWNS

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MOEZZYZADEH M.; JABERI ANSARI Z.; SHESHMANI M.

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Journal: Journal of Dental School Year:2012 | Volume:29 | Issue:SPECAIL ISSUE Page(s): 328-337

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Title

MARGINAL ADAPTATION OF THE THREE INDIRECT CROWNS

Author(s)

MOEZZYZADEH M. | JABERI ANSARI Z. | SHESHMANI M. | Issue Writer Certificate

Keywords

MARGINAL GAPQ2

INDIRECT COMPOSITE CROWNSQ2

MICROLEAKAGEQ3

Abstract

Background & Aim: Good marginal adaptation is a prerequisite for a successful crown restoration while the incidence of MICROLEAKAGE, caries, damage to the base teeth and periodontal diseases is facilitated when this criteria is not achieved. Therefore, the present study determined the MARGINAL GAP in the porcelain crowns compared to indirect composite restorations of GC Gradia and Signum.Materials & Methods: In this invitro experimental study, 30 impressions were taken in the similar conditions and randomly assigned to receive porcelain crowns (Noritake super porcelain Ex-3) or INDIRECT COMPOSITE CROWNS of GC Gradia and Signum when no fluid and porosity were noted on them. The crowns were fitted on the master metal die and assessed by the stereomicroscope after complete sitting and finishing line preparation. The assessments were carried out on 8 points 1mm from the finishing line (buccal, lingual, mesial, distal, mesiobuccal, distobucaal, mesiolingual and distolingual). Then, 8 jigs were fabricated and total 240 readings were made. The values were converted to micron and the statistical comparisons were made using nonparametric Kruskal-wallis and Mann-whitney U tests.Results: MARGINAL GAP of porcelain crowns was 29.08±9.38 mm and 84.53±15.47 mm on the lingual and disto lingual points andtheGC gradia indirect composite, was 43.63±13.40 mm and 74.53±28.03 mm on the distal and distolingual points as well as 39.08±17.68 mm and 95.44±30.66 mm on the distal and mesiolingual aspects of the Signum indirect composites respectively. No significant differences were noted between the three crowns brands on the mesial, distal, mesiobuccal, distobuccal, and mesiolingual aspects. only 3 points (buccal, lingual and disto lingual) had significant differences.Conclusion: Regarding clinically acceptable values of MARGINAL GAPs mentioned in the literature, porcelain jacket crowns and INDIRECT COMPOSITE CROWNS possesses the necessary criteria of MARGINAL GAP and can be successfully used for crown restorations.

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APA: Copy

MOEZZYZADEH, M., JABERI ANSARI, Z., & SHESHMANI, M.. (2012). MARGINAL ADAPTATION OF THE THREE INDIRECT CROWNS. JOURNAL OF DENTAL SCHOOL SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCE, 29(SPECAIL ISSUE), 328-337. SID. https://sid.ir/paper/21830/en

Vancouver: Copy

MOEZZYZADEH M., JABERI ANSARI Z., SHESHMANI M.. MARGINAL ADAPTATION OF THE THREE INDIRECT CROWNS. JOURNAL OF DENTAL SCHOOL SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCE[Internet]. 2012;29(SPECAIL ISSUE):328-337. Available from: https://sid.ir/paper/21830/en

IEEE: Copy

M. MOEZZYZADEH, Z. JABERI ANSARI, and M. SHESHMANI, “MARGINAL ADAPTATION OF THE THREE INDIRECT CROWNS,” JOURNAL OF DENTAL SCHOOL SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCE, vol. 29, no. SPECAIL ISSUE, pp. 328–337, 2012, [Online]. Available: https://sid.ir/paper/21830/en

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