Clinical Performance Of Lithium Disilicate Crowns Restoring Endodontically Treated Teeth With Two Occlusal Preparation Schemes

Study Overview
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Brief Summary
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The aim of this study is to evaluate the clinical performance of lithium disilicate crowns restoring endodontically treated teeth with two occlusal preparation schemes.

Detailed Description
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Statement of the problem: The endodontically treated teeth need to be restored back to form, function and aesthetics. The quality of the coronal restoration will directly impact on their survival and success. The aim of the coronal restoration of endodontically treated teeth is to provide the necessary strength for the restoration/tooth complex through tooth preparation in order to withstand functional stress and prevent crown and/or root fracture. The use of ceramic crowns has increased substantially in recent years because of their superior esthetics and high mechanical properties. Long term success of all ceramic crowns is affected by many factors and the failure patterns of these all ceramic crowns should be inspected closely to detect their clinical performance. Rationale for carrying out the trial: Endodontic treatment weakens posterior teeth and ought to be covered by crowns.The capability of these crowns to bear load relies on the preparation of an appropriate design and the selection of a crown material with adequate fracture strength and thickness. In vital teeth, the anatomic occlusal preparation design is followed such that the occlusal surface is reduced uniformly, maintaining the cusps and normal inclined planes but at a reduced height. This aids in minimizing the risk of pulp injury. In contrast, in non-vital teeth, this design can be modified such that the occlusal surface is prepared in two planes (buccal and lingual planes). A flat prepared occlusal surface provides less quantitative and better qualitative stresses when compared to an anatomically prepared surface

Official Title
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Clinical Performance Of Lithium Disilicate Crowns Restoring Endodontically Treated Teeth With Two Occlusal Preparation Schemes

Conditions
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Fracture of Lithium Disilicate (e.Max) Crowns

Intervention / Treatment
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* Procedure: Abutments with flat occlusal scheme preparation restored by lithium disilicate crowns


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Have no active periodontal diseases or periapical pathosis No tooth mobility or furcation involvement with sufficient occluso-gingival height Psychologically and physically able to withstand conventional dental procedures Patients with good endodontically treated teeth indicated for full coverage restorations Able to return for follow-up examination and evaluation Exclusion Criteria: Patient with active resistant periodontal diseases Patients with poor oral hygiene and uncooperative Pregnant women that won't be able to come for follow-up visits Patients in the growth stage with partially erupted teeth Psychiatric problems or unrealistic expectations Lack of opposing dentition in the area of interest Patients with poor root canal treatment Patients with parafunctional habits (eg. Bruxism)

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 50 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: flat occlusal scheme restored by lithium disilicate crown<br>flat occlusal preparation of endodontically treated teeth is performed clinically and then the final restorations will be lithium disilicate (e.max) crowns. | Procedure: Abutments with flat occlusal scheme preparation restored by lithium disilicate crowns<br>* Clinical trials lacks information about flat occlusal preparation design in case of endodontically treated teeth. Therefore, this is tested during preparation when compared to planer occlusal preparation while the final restoration in both arms is lithium disilicate (e.max) crowns.<br>|
| No Intervention: planar occlusal scheme restored by lithium disilcate crown<br>planar occlusal preparation of endodontically treated teeth is performed clinically and then the final restorations will be lithium disilicate (e.max) crowns. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Measuring number of Fracture | using USPHS criteria for clinical evaluation | one year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Degree of Marginal adaptation | using USPHS criteria for clinical evaluation | one year | 
| Degree of Marginal discoloration | using USPHS criteria for clinical evaluation | one year | 
| Presence of Caries | using USPHS criteria for clinical evaluation | one year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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e.max, occlusal scheme, endodontically treated teeth