Malocclusions

This study aims to evaluate changes in depressive symptoms and subjective esthetic perception before and after bimaxillary orthognathic surgery in patients with different types of malocclusion. The study will analyze anonymized clinical data and questionnaire responses to assess the impact of orthognathic surgery on psychological well-being and esthetic perception.

To study the effect vitamin D effect on orthodontic tooth movement when used in combination with coticision technique, independent t test or an equivalent non-parametric test will be used for comparison. According to a previous study by (S. T. Varughese, et al. (2019) , "Effect of vitamin D on canine distalization and alveolar bone density using multi-slice spiral CT: a randomized controlled trial

The goal of this interventional research is to determine the impact of vitamin D intake on substances in saliva, pain, tooth movement, and the density of the bone around teeth in patients during orthodontic treatment. It will compare the effects of vitamin D supplementation with a placebo to clarify its role in the aforementioned aspects of orthodontic care. The main questions it aims to answer are: How does vitamin D supplementation affect salivary opiorphin levels in patients undergoing fixed orthodontic mechanotherapy at Specialist Hospital Universiti Sains Malaysia? What is the impact of vitamin D supplementation on pain perception during fixed orthodontic mechanotherapy? How does vitamin D supplementation influence the rate and quality of tooth movement in patients undergoing fixed orthodontic mechanotherapy? What is the relationship between salivary opiorphin levels and pain perception in patients supplemented with vitamin D during fixed orthodontic mechanotherapy? How does vitamin D supplementation affect changes in alveolar bone density during fixed orthodontic mechanotherapy? Researchers will provide vitamin D to the experimental group while the control group receives a placebo to see if vitamin D intake has an impact on substances in saliva, pain, tooth movement, and the density of the bone around teeth during orthodontic treatment. Participants will: Take vitamin D or a placebo every day for 4 months Visit the clinic once every 4 weeks for checkups and tests Participate in the study for a duration of up to 4 months

This study aims to evaluate the effectiveness of auxiliary segmental lingual appliances in leveling the Curve of Wilson at the second molars in patients undergoing labial fixed orthodontic treatment. Patients exhibiting an excessive (deep) Curve of Wilson at the second molar bilaterally (meaning lingually inclined mandibular second molar) will be recruited.. Using a split-mouth design, one side will receive the intervention (auxiliary segmental lingual appliances), while the other side will serve as the control. The variables measured include the Curve of Wilson at the second and first molars, and the distance from the mesiolingual and distolingual cusps of the second molar to the occlusal plane of the first molar. Measurements will be taken on digital impressions at baseline (T0), after leveling with a stainless steel labial archwire (T1), and three months after applying the auxiliary segmental lingual appliances. The effectiveness will be assessed by comparing the two groups.

The purpose of this study is to compare expansion result and the overall experience between the Invisalign Palatal Expander and the Hyrax expander.