Accuracy of 3-dimensional Printed Implant Cast Versus Conventional Stone Cast for Edentulous Mandibular Arch

Study Overview
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Brief Summary
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This study will be conducted to compare between accuracy of 3D printed implant cast produced from digital impression and conventional stone cast produced from conventional splinted open tray impression for edentulous mandibular arch with four implants.

Official Title
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Accuracy of 3-dimensional Printed Implant Cast Versus Conventional Stone Cast for Edentulous Mandibular Arch: A Comparative Study

Conditions
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Prosthesis Durability

Intervention / Treatment
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* Procedure: implant casts fabrication


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: • Patients were healthy and free from all systemic diseases that affect osseointegration or bone resorption around the implant as recorded from medical and dental history. Patients were free from all oral pathological conditions and any remaining roots which were verified by pre-operative panoramic radiograph. Patients with U shaped arch, flat mandibular alveolar ridge covered with even compressibility healthy mucosa and gingival thickness of about 2mm verified by dual scan of cone beam computed tomography (CBCT) during treatment planning. Fig.(1) Adequate residual alveolar bone quality D2 bone type in the anterior and premolar regions according to the Misch bone density classification scheme (850 to1250 housefield units) confirmed by CBCT. Angel's class I maxillomandibular relation with moderate inter- arch space (20 mm) confirmed through tentative jaw relationship, and restorative space of at least 15 mm determined by putty index technique Patients complain from poor retentive mandibular denture seeking for alternative fixed options. Patient who is motivated, agreed with the follow-up visits and willing to return for follow-up appointments. Exclusion Criteria: • Patient with absolute contraindications that interfere with surgical placement and osseointegration of implants as uncontrolled diabetes mellitus, generalized osteoporosis, recent myocardial infarction, patient with radiotherapy. Patient with relative contraindication such as UN controlled diabetes mellitus, moderate smoking and alcoholism, patient with TMJ disorder and heavy smokers for more than10 cigarettes per day. Patient with local contra indication as insufficient bone quality, localized lesion in canine area and premolar area, unfavourable position of the lower alveolar or mental nerve, bone defects as verified by cone beam CT. Uncooperative patient.

Ages Eligible for Study
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Minimum Age: 45 Years
Maximum Age: 70 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: Crossover Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Group I conventional stone cast<br>Mandibular stone cast with 4 parallel implants analogues in canines and second premolar regions will be fabricated conventionally. | Procedure: implant casts fabrication<br>* four implant casts fabricated<br>|
| Active Comparator: Group II 3D printed implant cast<br>3D printed implant mandibular cast with 4 parallel digital implants analogues in canines and second premolar regions will be fabricated digitally. | Procedure: implant casts fabrication<br>* four implant casts fabricated<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| accuracy of 3D printed casts | Accuracy of 3D printed casts will be evaluated digitally by geomagic software | 6 month |