Clinical Evaluation of Polymethyl Methacrylate CAD/CAM Crowns Versus Prefabricated Zirconia Crowns in Primary Molars

Study Overview
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Brief Summary
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, in this studythe investigator will compare between ready-made zirconia crowns and Computer-aided design and Computer-aided manufacturing (CAD/CAM) polymethyl methacrylate (PMMA) crowns to overcome the disadvantages of ready-made zirconia crowns.

Official Title
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Clinical Evaluation of Polymethyl Methacrylate CAD/CAM Crowns Versus Prefabricated Zirconia Crowns in Primary Molars

Conditions
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Caries of Infancy

Intervention / Treatment
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* Other: preparation of the tooth to receive ready made zirconia crown
* Other: preparation of the tooth to receive CAD CAM PMMA custom made crown


Participation Criteria
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Eligibility Criteria
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A- Inclusion Criteria: Primary molars indicated for crown restoration (pulp treated molars indicated for crown Co-operative child (Frankel scale +ve and ++ve) The age ranged from 4 to 8 years regardless of sex or socioeconomic background. B- Exclusion Criteria:- Badly decayed non-restorable tooth indicated for extraction. Patients with parafunctional habits like bruxism. Systemic diseases with oral manifestation or blood diseases.

Ages Eligible for Study
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Minimum Age: 4 Years
Maximum Age: 8 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: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: ready made zirconia<br>the selected tooth will receive ready made zirconia crown | Other: preparation of the tooth to receive ready made zirconia crown<br>* Occlusal reduction 1 to 2 mm using flame bur . Open the interproximal contacts. The tooth should be reduced circumferentially by approximately 0.5-1.5mm . The preparation margin should be carefully extended and refined to a feather-edge approximately 1-2mm subgingivally . Crown size will be determined using try in kit .<br>|
| Experimental: pmma crown<br>the selected tooth will receive cad cam custom made pmma crown | Other: preparation of the tooth to receive CAD CAM PMMA custom made crown<br>* Open the interproximal contacts . The tooth should be reduced circumferentially by approximately 0.5-1mm . The preparation margin should be carefully extended and refined to a feather- edge approximately 1-2mm subgingivally . Rubber base impression will be taken by BMS additional silicone kit to the prepared tooth and will be sent to the laboratory to be scanned and to design the crown . The final crown will be cemented using glass ionomer cement .<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Gingival condition | Löe & Silness gingival index | in 6 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| gingival bleeding | Papilla Bleeding Index | 6 months |