Individuals with large mandibular plane angles (MPA) have weaker masticatory muscles compared to those with normal MPA. Their impaired muscle function has been associated with craniofacial and skeletal disharmony, often exhibiting open bite. Weak orofacial muscles preclude normal occlusal movements such as canine guided occlusion and incisal guidance, resulting in rapid molar attrition and temporomandibular disorder.
On the other hand, individuals with small MPA typically have stronger masticatory muscles and have a deep bite tendency. Both hyperdivergent and hypodivergent patients are commonly exposed to periodontal diseases; if such vertical discrepancies are corrected at a right time with a proper method, it possibly prevents future periodontal diseases and reduces prosthodontic needs.
Early orthodontic treatment of patients with congenitally missing teeth may also decrease future demands for dental prostheses or implants, contributing to lifelong oral health.
I hope my clinical cases become a chance to think about your own way of treatment options for patients with hyperdivergency, hypodivergency and congenitally missing teeth.
박형수 원장(보배치과)
● Chosun University, College of Dentistry: DDS
● Chosun University, College of Dentistry, Department of Orthodontics: MS, PhD
● The Charles H. Tweed International Foundation for Orthodontic Research and Education: Fellow member
● The Korean Orthodontic Research Institute Inc: Member and Instructor
● The Korean Association of Orthodontists: Certified member
