Diagnosis, design and comprehensive orthodontic treatment of difficult cases;
Orthognathic-orthodontics combined treatment, sequential treatment of cleft lip and palate, periodontal treatment, occlusal treatment of deciduous teeth and mixed teeth, orthodontics-restoration combined treatment. He has published monographs such as "Health begins with teeth", "Getting out of the misunderstanding of oral health care" and papers such as "Comparison of clinical effects of two methods of enamel removal on adjacent surfaces". Edgewise arch correction