Facial profile changes with various orthodontic premolar extraction sequences during growth

Area of Science:

• Orthodontics
• Craniofacial Growth
• Predictive Modeling

Background:

• The Visual Treatment Objective (VTO) aids in orthodontic treatment planning, particularly for inexperienced clinicians.
• Accurate VTO construction is crucial for determining optimal tooth extraction strategies.
• Existing VTO methods using mean values have limitations in predicting individual facial profile changes.

Purpose of the Study:

• To develop predictive formulas for anteroposterior facial profile changes in growing individuals undergoing four premolar extractions.
• To enhance the certainty of extraction decisions in orthodontic treatment planning.
• To provide tools for more precise VTO construction in selected cases.

Main Methods:

• Analysis of records from 248 growing Caucasian orthodontic patients (120 males, 128 females).
• Patients categorized into three extraction groups: four first premolars (Group 44), upper first/lower second premolars (Group 45), and four second premolars (Group 55).
• Regression analysis used to derive formulas for incisor retraction, nose growth, and chin growth.

Main Results:

• Presented formulas predict incisor retraction, anteroposterior nose growth, and chin growth.
• These formulas are based on regression analysis of patient data.
• The developed formulas offer greater certainty in predicting facial profile changes.

Conclusions:

• The derived formulas can be utilized in constructing Visual Treatment Objectives (VTOs) for specific patient cases.
• This research provides a more accurate method for predicting facial profile changes during orthodontic treatment.
• The findings support improved treatment planning and decision-making in orthodontics.