The Effect of Different Treatment Modalities of Class II Malocclusion on Upper Third Molars.

Study Overview
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Brief Summary
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What is the effect of the different treatment modalities (distalization versus upper premolar extraction) of class II malocclusion on the position, inclination and incidence of impaction of the upper third molars?

Detailed Description
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What is the effect of the different treatment modalities (distalization versus upper premolar extraction) of class II malocclusion on the position, inclination and incidence of impaction of the upper third molars? Pico P: Adolescent patients with class II malocclusion having bilateral developing upper third molars. I: bilateral upper first premolar extraction orthodontic treatment with moderate anchorage. C: distalization orthodontic treatment. O: Primary: angulation of the maxillary third molars.

Official Title
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The Effect of Different Treatment Modalities of Class II Malocclusion on Upper Third Molars: A Retrospective Longitudinal Study

Conditions
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Third Molar Impaction

Intervention / Treatment
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* Other: extraction orthodontic treatment


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adolescent males and females (16 -18 years) with Bilaterally developing maxillary third molars. Not more than two thirds of the root development of the third molars had taken place. Class II malocclusion cases that were treated by 1) maxillary premolar extraction with a moderate anchorage requirement and achieved full unit class II molar relationship or 2) Distalization treatment plan and class I molar relationship was achieved. Patients with high-quality pre- and post-treatment radiographs. Normal or increased vertical dimension. Exclusion Criteria: Maxillary Premolar extraction cases requiring maximum anchorage preparation. Low vertical dimension. Patients without dentofacial deformities, severe facial asymmetries, microdontia or hypodontia.

Ages Eligible for Study
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Minimum Age: 16 Years
Maximum Age: 18 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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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| extraction treatment<br>patients treated with bilateral upper first premolar extraction orthodontic treatment with moderate anchorage. | Other: extraction orthodontic treatment<br>* bilateral upper first premolar extraction orthodontic treatment with moderate anchorage.<br>|
| distalization treatment<br>patients treated by distalization orthodontic treatment. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The angulation of the maxillary third molars. | the angle between the long axis of the third molar and the palatal plane | up to 24 weeks. | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The vertical position of the third molars | the vertical position of the third molar relative to the second molar measured using Archer classification tool. (qualitative measure) | up to 24 weeks | 
| The mineralization status of the third molars | the amount of calcified tissues of the third molar measured using Demirjian classification method | up to 24 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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distalization, premolar extraction, upper third molar, impaction of third molar