دورية أكاديمية
Nondestructive, in vitro quantification of crown margins.
| العنوان: | Nondestructive, in vitro quantification of crown margins. |
|---|---|
| المؤلفون: | Mitchell CA; School of Clinical Dentistry, The Queen's University of Belfast, Belfast, Northern Ireland, United Kingdom. c.mitchell@qub.ac.uk, Pintado MR, Douglas WH |
| المصدر: | The Journal of prosthetic dentistry [J Prosthet Dent] 2001 Jun; Vol. 85 (6), pp. 575-84. |
| نوع المنشور: | Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
| اللغة: | English |
| بيانات الدورية: | Publisher: Mosby-Year Book Country of Publication: United States NLM ID: 0376364 Publication Model: Print Cited Medium: Print ISSN: 0022-3913 (Print) Linking ISSN: 00223913 NLM ISO Abbreviation: J Prosthet Dent Subsets: MEDLINE |
| أسماء مطبوعة: | Publication: St. Louis Mo : Mosby-Year Book Original Publication: St. Louis, Mosby. |
| مواضيع طبية MeSH: | Crowns* , Dental Prosthesis Design*, Tooth Preparation, Prosthodontic/*methods, Analysis of Variance ; Bicuspid/anatomy & histology ; Dental Casting Technique ; Dental Impression Technique ; Dental Porcelain ; Dental Veneers ; Gold Alloys ; Humans ; Image Processing, Computer-Assisted ; Metal Ceramic Alloys ; Surface Properties ; Tooth Crown/anatomy & histology |
| مستخلص: | Statement of Problem: It is important that artificial crowns fit the prepared tooth accurately, as marginal deficiencies are predisposed to plaque accumulation and lead to increased risk of periodontal disease. Various methods of evaluation for marginal fit are described in the literature, but most approaches are limited by destructive methods of assessment and/or small points of measurement. Purpose: This study compared, in vitro, the marginal fit of 4 types of complete crowns on human premolar teeth with the use of nondestructive profilometry. This method determined whether fit was influenced by type of crown or surface morphology of the tooth, namely, grooved or ungrooved surfaces. Material and Methods: Four groups of specimens were prepared for complete crowns: group BA, bonding alloy with chamfer finish line; group G, gold alloy with chamfer finish line; group PC, porcelain with a chamfer finish line; and group PS, porcelain with a shoulder finish line. Two profiles of grooved mesial and ungrooved distal surfaces of the teeth were performed: (1) teeth prepared for each type of crown and (2) teeth with crowns seated but not cemented. Marginal fit (absolute marginal discrepancy) from the finish line edge of the tooth preparations to crown edges (CE) and leading edges (LE) of crowns were measured. Results: A 2-way analysis of variance for crown type and tooth surface morphology revealed significant differences between crown types for all measurement parameters, except vertical LE. The effect of surface morphology was not significant, except for vertical LE (P<.05). For all parameters, except vertical LE, the ranking of marginal fit discrepancies from greatest to least was as follows: group PC, G, BA, and PS. For vertical LE distances, the ranking was PS, BA, G, and PC (P<.05). Conclusion: Profilometry was used as a nondestructive, accurate method of evaluating the absolute marginal fit of different types of crowns. Marginal fits varied continuously around the circumference of each crown and made clinical assessment of fit accuracy subjective and arduous. |
| معلومات مُعتمدة: | DE09737 United States DE NIDCR NIH HHS |
| المشرفين على المادة: | 0 (Gold Alloys) 0 (Metal Ceramic Alloys) 12001-21-7 (Dental Porcelain) |
| تواريخ الأحداث: | Date Created: 20010619 Date Completed: 20010816 Latest Revision: 20071114 |
| رمز التحديث: | 20221213 |
| DOI: | 10.1067/mpr.2001.114268 |
| PMID: | 11404758 |
| قاعدة البيانات: | MEDLINE |
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