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The aim of this study was to assess the impact of flat occlusal preparation design (FOD) of endodontically treated molars on the fracture resistance and distribution of stresses among a ceramic crown-molar structure when compared to two planes occlusal preparation design (TOD).
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Flat occlusal scheme | Active Comparator | occlusal design |
|
| Anatomic occlusal scheme | Active Comparator | occlusal design |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Monolithic zirconia crown | Procedure | All-ceramic crown |
|
| Measure | Description | Time Frame |
|---|---|---|
| Fracture | Using Modified United States Public Health Service (USPHS) criteria | 12 months |
| Measure | Description | Time Frame |
|---|---|---|
| Marginal adaptation | Using Modified United States Public Health Service (USPHS) criteria | 12 months |
| Marginal discoloration | Using Modified United States Public Health Service (USPHS) criteria |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Sameh Abou-Steit, Lecturer | Lecturer of Fixed Prosthodontics | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Cairo University | Cairo | Egypt |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 24651340 | Background | Mannocci F, Cowie J. Restoration of endodontically treated teeth. Br Dent J. 2014 Mar;216(6):341-6. doi: 10.1038/sj.bdj.2014.198. | |
| 20108535 | Background | Varlan C, Dimitriu B, Varlan V, Bodnar D, Suciu I. Current opinions concerning the restoration of endodontically treated teeth: basic principles. J Med Life. 2009 Apr-Jun;2(2):165-72. |
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Triple blinded: The trial participants, the outcome assessors and the data analysis statistician are blinded
| Monolithic lithium disilicate crown | Procedure | All-ceramic crown |
|
| 12 months |
| Secondary caries | Using Modified United States Public Health Service (USPHS) criteria | 12 months |
| 22259801 | Background | Beier US, Kapferer I, Dumfahrt H. Clinical long-term evaluation and failure characteristics of 1,335 all-ceramic restorations. Int J Prosthodont. 2012 Jan-Feb;25(1):70-8. |
| 15674228 | Background | Nagasiri R, Chitmongkolsuk S. Long-term survival of endodontically treated molars without crown coverage: a retrospective cohort study. J Prosthet Dent. 2005 Feb;93(2):164-70. doi: 10.1016/j.prosdent.2004.11.001. |
| 24750896 | Background | Oyar P, Ulusoy M, Eskitascioglu G. Finite element analysis of stress distribution in ceramic crowns fabricated with different tooth preparation designs. J Prosthet Dent. 2014 Oct;112(4):871-7. doi: 10.1016/j.prosdent.2013.12.019. Epub 2014 Apr 21. |