The goal of this retrospective observational study is to compare the effects of Clear Aligner Mandibular Advancement (MA) and Twin Block (TB) appliances in treating Class II malocclusion, a condition where the lower jaw is underdeveloped. The main questions it aims to answer are: 1. Does mandibular advancement with clear aligners improve jaw and dental alignment as effectively as Twin Block appliances? 2. What are the differences in soft tissue changes, such as chin advancement and lip position, between these two treatments? Researchers will compare MA and TB appliances to an untreated control group to evaluate their impact on skeletal, dental, and soft tissue outcomes. Participants in the study underwent cephalometric analysis (X-ray measurements) both before and after treatment to assess changes in jaw positioning, overbite, and overjet. The study focuses on how each treatment affects facial aesthetics and dental function. Participants in the study will: * Undergo treatment with either clear aligner mandibular advancement or Twin Block appliances. * Attend follow-up appointments to monitor progress and assess treatment outcomes.
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Changes in Skeletal Measurements ( SNB angle)
Timeframe: Baseline and post-treatment cephalometric radiographs will be taken 1-2 weeks pre and 1-2 weeks post the 12-month treatment at West China School of Stomatology, Sichuan University.
Changes in Soft Tissue Measurements ( soft tissue chin thickness)
Timeframe: Baseline and post-treatment cephalometric radiographs will be taken 1-2 weeks pre and 1-2 weeks post the 12-month treatment at West China School of Stomatology, Sichuan University.
Changes in Skeletal Measurements (ANB angle)
Timeframe: Baseline and post-treatment cephalometric radiographs will be taken 1-2 weeks pre and 1-2 weeks post the 12-month treatment at West China School of Stomatology, Sichuan University.
Changes in Skeletal Measurements ( mandibular length)
Timeframe: Baseline and post-treatment cephalometric radiographs will be taken 1-2 weeks pre and 1-2 weeks post the 12-month treatment at West China School of Stomatology, Sichuan University