Effect of Using (PEKK) Framework Versus (Co- Cr) Framework on The Bone of Mandibular Implant Supported Hybrid Prostheses

Study Overview
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Brief Summary
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the purposse of the study To evaluate the effect of implant supported hybrid prostheses on the bone of the supporting structure of edentulous mandible using Polyetherketoneketone (PEKK) framework versus cobalt chromium framework. fourteen female patients with lower single edentulous ridges are chosen with adequate dental hygiene, enough interarch space and free of systemic diseases and parafunctional habits. Patients who received new single dentures are randomly allocated into each group using computer software program and five intraforaminal implants were inserted parallel using surgical guide.

Detailed Description
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Patient's approval: All patients will be informed in details about the nature of the investigation and the aim of the study. They will agree to take part in the study and will sign on an informed consent form. All participants will be given notice about their privacy practices, their legal duties and their rights. In case of implant treatment failure, the patients will receive a new well-fitting denture. Patient's grouping: In this study there will be two equal groups, grouping will be based on the material that will be used for framework construction: Group I: framework will be fabricated using PEKK. Group II: frame work will be fabricated using cobalt chromium alloy. Clinical steps: Pre-prosthetic phase:- Conventional single lower denture will be made for all patients. Occlusal adjustment of upper teeth will be done for all patients. The single lower denture will be duplicated with radiographic markers and CBCT will be used to determine exact position of implants. Surgical phase:- Five conventional implants in intraforaminal area will be placed according to the planned cone beam CT using surgical guide to accurately place the implants. Postoperative analgesics and anti-inflammatory medications will be described. After osseointegration, second surgery will be carried out and healing abutment will be screwed for each implant. Prosthetic phase:- After healing period open top tray impression will be made. Jaw relation record will be taken using record bases and wax rims. Group I: The PEKK framework will be milled using milling machine. Group II: cobalt chromium framework will be made with wax pattern milling then casted by conventional method. The PEKK framework will be veneered with zirconia and the cobalt chromium will be veneered with porcelain. Implant supported fixed detachable prostheses using PEKK framework or cobalt-chromium framework will be screw retained to conventional implants.

Official Title
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Effect of Using Polyetherketoneketone (PEKK) Framework Versus Cobalt Chromium Framework on The Supporting Structures of Mandibular Implant Supported Hybrid Prostheses

Conditions
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Alveolar Bone Loss

Intervention / Treatment
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* Procedure: implant placement


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patient's age range from 50 to 60 year's old. All patients are with completely edentulous mandible. Good oral hygiene is mandatory. Sufficient interarch space to accept implant supported fixed prosthesis will be diagnosed by mounted diagnostic casts. Firm and healthy mucosa covering the alveolar ridge. Minimum bone width 5.5mm buccolinguallly and 10 mm height will be diagnosed by the preoperative cone beam CT scan. Exclusion Criteria: - Vulnerable group; prisoners, mentally, physically disabled, pregnant females. Patients with Para functional habits. Patients having TMJ disorders. Uncontrolled diabetic patients Patients have any medical condition or any disease that could interfere with implant placement or affect bone loss.

Ages Eligible for Study
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Minimum Age: 50 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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Female

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: Other
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: to compare PEKK framework for hybrid prostheses ( fixed detachable ) versus PFM framework
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: (PEKK fixed hybrid prostheses<br>5 implants were placed in mandibular arch by surgical guide and after 3 months the prostheses was constructed by using digital workflow | Procedure: implant placement<br>* 5 implant were placed in intraforaminal area using surgical guide<br>* Other names: final prostheses was made on 5 implants;|
| Other: PFM fixed hybrid prostheses<br>5 implants were placed in mandibular arch by surgical guide and after 3 months the prostheses was constructed by using digital workflow until making wax pattern the casting was made. | Procedure: implant placement<br>* 5 implant were placed in intraforaminal area using surgical guide<br>* Other names: final prostheses was made on 5 implants;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| amount of bone loss around implant | The points of first bone contact with the fixture platform were detected and changes of those points position through the two years of observation were registered as a criterion of bone changes with further calculation of average values. A software ruler of CBCT was used to measure the crestal bone height in contact with the implant from the four aspects (buccal, lingual, mesial and distal). | 2 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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hybrid prosthesis, PEKK framework, PFM framework