Transverse discrepancy is not easily recognized by the patient and the orthodontic envelope of discrepancy is reportedly narrow in the transverse direction, which is why surgically assisted palatal expansion is recommended for the correction of maxillary transverse deficiencies in grown-up patients. Due to the inherent invasiveness and morbidity, an alternative has always been sought for.
In this lecture, the biomechanical rationale, appliance fabrication and clinical manipulation of the miniscrew-assisted RPE (MARPE) will be extensively discussed, with special focus on the underlying suture biology and the biomechanics of orthopedic expansion, to explain the validity of the appliance design and expansion protocol. A number of clinical cases indicating the use of MARPE including Class III, asymmetry nonsurgical cases will be demonstrated. Troubleshooting in failure cases will also be explained. According to the theoretical background and clinical examples, it appears that deficiency in the maxillary posterior region, not necessarily the anterior region necessitates true orthopedic expansion which secures the quality and stability of occlusal outcomes.
1. To understand why transverse correction is crucial in orthodontics
2. To understand the suture structure and expansion protocol-rapid or slow?
3. To understand how to diagnose the transverse deficiency
4. To understand the validity of appliance design & the role of miniscrews
5. To understand the clinical effects and stability of expansion in terms of nonextraction & nonsurgical treatment
About lecturer
- Professor, Department of Orthodontics, Yonsei University, Korea
- Visiting scholar, Dept of Biochemistry, University of Pennsylvania
- Adjunct professor, Department of Orthodontics, University of Pennsylvania(2010~2011, 2016~2019), Temple University
- Visiting Scholar, the Children’s Hospital of Philadelphia
Anterior open bite is a very challenging malocclusion even for excellent orthodontists. It is very difficult to diagnose differentially and to retain the post-treatment result well, because one case may have several etiologic factors. Since MRI and CT were used to screen the etiologic factors, I have realized once more that ‘open bite’ is one sign of different diseases caused by thumb sucking, tongue thrusting, low tongue posture, mouth breathing, macroglossia, temporomandibular disease and ankylosis of anterior teeth. It cannot be overemphasized to try to find and to remove the causing factors first. According to the causes the open bite should be treated differentially.
1) Etiologic factors of open bite
2) How to find and resolve the etiologic factors
3) Case presentation of open bite:
- Mouth breathing
- Tongue thrusting
- Ankylosed incisor
- Thumb sucking
- Macroglossia
4) Open bite with TMD:
-Dentofacial changes following TMD
5) Mechanics to close the open bite efficiently:
- Selection of mechanics
- Orthognathic surgery
- MEAW
- Mini-implant
- Combination technique
- Сlinical tips
6) How to retain the stable result
About lecturer
- Professor in Orthodontics, Seoul National University
- He was a visiting professor(1995-7) of University of Washington
- He was an editor-in-chief of Korean Journal of Orthodontics(KJO) for many years
- He was President of Korean Association of Orthodontists
- He works as a reviewer of KJO, AJODO and other famous international journals. His focused research fields are TMD, open bite, mini-implants and long-term stability
- He was invited as speakers by many orthodontic associations and schools all over the world
- He received Kwansong Award from Korean Association of Orthodontists
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