Comparison Between Bone Supported -Pendulum Appliance and Lever-arm Mini-implant System in Maxillary Molar Distali zation in Class II Malocclusion

Abstract

Upper molar distalization with noncompliance therapies has become more popular in treatmentof Class II malocclusions.Purpose: This study was conducted to evaluate and compare the dentofacial changes afterdistalization of maxillary first molars using bone anchorage pendulum and Lever-arm mini-implantsystem in the treatment of dental Class II cases non-extraction cases.Subjects and Methods: The sample of this study was consisted of 30 patients of both sexes(16- 22 years old) divided into two groups. The first group consisted of 15 patients, their molar weredistalized with BAPA. The second group consisted of 15 patients, their molar were distalized withLAMS. The evaluation of the study was performed by detecting the changes on dental casts andlateral cephalograms.Results: All maxillary molars were distally moved into a super class I relationship successfullyin both groups (7.2 months in BAPA group and 10.5 months in LAMS group) and there was ahighly significant changes in the distal tipping of the maxillary first molar between the two groups,BAPA (22.8°) while the amount of distal tipping of the maxillary first molar in LAMS group was(10.29°).Conclusion: Both LAMS and BAPA appliances were effective, less invasive and compliancefree alternative for intraoral upper molar distalization without anchorage loss. Lever-arm and miniimplantsystem was effective for achieving absolute anchorage during the distal movement of uppermolars.