Clinical Assessment of Two Inlay -Retained Bridge Designs

Study Overview
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Brief Summary
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in the last years, dentistry is going to the concept of conservatism to preserve the most amount of tooth structure, so the evolution of new ceramic materials with invasive designs like (inlay- shaped and proximal box shaped) inlay retained bridge, the investigators can restore single missing posterior teeth with less invasive techniques and less rate of restoration fracture.

Detailed Description
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It has been demonstrated that a great amount of tooth structure is lost during the prosthetic preparations of abutments for full-coverage FDPs with tooth substance removal of 63% of 73%, this aggressive loss of tooth structure usually accompanied with pain and postoperative sensitivity. In comparison With the inlay-retained bridge, there is less amount of tooth substance loss. this clinical study will provide benefits for practitioners and clinicians by guiding them to choose a more conservative treatment plan with the better marginal fit, clinical performance and satisfaction for the patients on the long term. rather than other benefits like less chair time, less risk for pulp injury, less time and cost

Official Title
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Clinical Assessment of Two Inlay -Retained Bridge Designs (Proximal Box Shaped and Inlay Shaped) in Missing Posterior Teeth Cases

Conditions
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Tooth Fractures

Intervention / Treatment
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* Other: proximal box inlay retained bridge


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Absence of periapical or periodontal or diseases sound abutment teeth or with small caries or filling on occlusal or proximal surfaces Maintenance of good oral hygiene No tooth mobility or grade 1 can be accepted Sufficient occluso-gingival tooth height (5mm) Good alignment of abutment teeth mesiodistal edentulous space preferred not exceed 12mm Exclusion Criteria: Patients under the age of 18 or being incapable of taking out a contract Patients with any medical condition that impaired correct oral hygiene Endodontic ally treated abutment teeth a conspicuous medical or psychological history bruxism, or known allergic reaction to the materials used limited vertical space for the required connector height of 4mm pregnant female patients

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 51 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: ( proximal box design)<br>The proximal box at least ( 1mm wide and has 6◦ divergences, and extend 2 mm apical to the isthmus ﬂoor. | Other: proximal box inlay retained bridge<br>* inlay retained bridge is the less invasive type to restore single missing teeth in the posterior area<br>* Other names: all ceramic inlay retained bridge;|
| Active Comparator: ( inlay shaped design)<br>The occlusal inlay has a preparation depth of 2.0 mm for the ceramic. The occlusal preparation ( 4 mm wide and extend 4mm for premolar and 6 mm for molar mesiodistally | Other: proximal box inlay retained bridge<br>* inlay retained bridge is the less invasive type to restore single missing teeth in the posterior area<br>* Other names: all ceramic inlay retained bridge;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| fracture | resistance of restoration to disintegrate and the assessment for the outcome will be done by using MUSPHS scale and the measuring unit is score | 1 year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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proximal box design preparation