[The changing of orofacial structure by bite opening with Begg technique]

Area of Science:

• Orthodontics
• Dentofacial Orthopedics
• Cephalometric Analysis

Background:

• Deep bite (overbite) is a common malocclusion requiring effective treatment strategies.
• Extraction of first premolars is a conventional approach for managing severe malocclusions.
• The Begg technique offers a specific approach to orthodontic tooth movement.

Purpose of the Study:

• To analyze the cephalometric changes associated with deep bite correction using first premolar extraction and Begg appliance.
• To quantify the vertical and horizontal movements of incisors and molars during bite opening.
• To evaluate associated changes in the bony base and soft tissue profile.

Main Methods:

• Cephalometric analysis of 30 patients with deep bite treated with four first premolar extractions.
• Application of the Begg stage I appliance for orthodontic treatment.
• Measurement of incisor and molar vertical and horizontal displacements.

Main Results:

• Bite opening was achieved through combined intrusion of upper and lower incisors and extrusion of upper and lower molars.
• Greater intrusion of lower incisors compared to upper incisors was observed.
• More significant extrusion of lower molars than upper molars occurred.
• Changes in the bony base and soft tissue profile were also noted.

Conclusions:

• The treatment protocol effectively opened the bite via controlled incisor intrusion and molar extrusion.
• Differential vertical movements of incisors and molars contribute to overbite correction.
• Understanding these tooth movements aids in predicting and managing skeletal and soft tissue changes in deep bite cases.