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Nationality：Korea (Republic of [South] Korea)Lecture :
total arch intrusion and the symphyseal remodelingCV or Autobiography :Dr. Kee-Joon Lee is professor of the Department of Orthodontics, Yonsei University College of Dentistry, Seoul, Korea. He received DDS and PhD degree from Graduate school, College of Dentistry, Yonsei University. He completed the orthodontics specialty training in Yonsei University. He was a visiting scholar at the Department of Biochemistry, University of Pennsylvania School of Dental Medicine in 2002-2004 and at the Division of Plastic Surgery, the Children’s Hospital of Philadelphia in 2010-2011. He is currently an adjunct professor at the Department of Orthodontics, University of Pennsylvania. He has contributed many book chapters on biomechanics of miniscrew-driven orthodontics, non-extraction treatment in adults, up-to-date lingual orthodontic mechanics and surgery-first approached using TADs. He is the first who demonstrated the miniscrew-assisted rapid palatal expander (MARPE) for adults in AJO-DO, which was cited by many other authors. He has published many articles and case reports regarding the treatment of non-eruption, and total arch movement for hyperdivergent face in orthodontic journals including two cover issues in AJO-DO. His fields in research include clinical biomechanics regarding TADs application and the suture and bone responses to orthodontic stimulus. He has served as a reviewer in major orthodontic journals, including AJO-DO, Angle Orthodontists and European Journal of Orthodontics. He has been invited to many international orthodontic conferences around the world.
Vertical excess of the facial dimension is common and can be expressed in various ways-gummy smile, lip incompetency and/or retrusive mandible. Due to the genetic nature of the vertical growth, however, it has been recognized as very challenging to correct the hyperdivergent face. A latest meta-analysis revealed the lack of clinical evidence in the vertical control using conventional appliances including high pull head gear. In contrast, a reliable dentoalveolar movement using miniscrews is inspiring. Our recent clinical study revealed the possibility of total arch movement depending on the force direction with regard to the com, magnitude and the timing of the force application. the vertical control of the face can be clinically effective. In this session, the biomechanics, clinical effects and stability of vertical control using total arch intrusion will be explained in the aspects of etiology, protocols and stability. Additionally, possibilities of four-dimensional movement for children with hyperdivergent face involving ‘symphyseal remodeling’ will be demonstrated.
1) Esthetic goals – application of soft tissue paradigm
A harmonious perioral muscular function is a determinant for balanced dentofacial growth and development and in particular the perioral region plays an essential role in facial attractiveness. However, previous literature indicated variation in the vertical dimension is hardly noticeable. Moreover, there has been scarce evidence in the true vertical control possibly due to the genetic nature of vertical dimension. In contrast, some soft tissue phenotypes such as lip incompetency and mentalis hyperactivity have been recognized as a significant contributor for facial aberrancy.
To our surprise, our recent study revealed no significant relationship between vertical hard tissue measurements and soft tissue phenotypes. Taken together, it is reasonable to recognize the vertical facial morphology based on soft tissue phenotypes.
2) Biomechanics of labial/lingual total arch intrusion
Biomechanical backgrounds and related strategies using miniscrews are to be explained. Considering the strong genetic nature of the circummaxillar sutures, it is reasonable to conduct major dentoalveolar intrusion rather than supression of sutural growth. The behavior of the whole arch in response to various force vectors will be presented using both experimental and clinical data. The total arch intrusion in both labial and lingual orthodontics will be demonstrated. Depending on the time point when the total arch intrusion was performed, the clinical outcome may vary. Combination of the treatment concepts with or without extraction and understanding on normal growth pattern may lead to significant resultant. In addition, to find the best indication and to anticipate the prognosis, diagnoses have to be made based on the soft tissue paradigm.
3) Biology of symphyseal remodeling
Considering the general rule of the facial esthetics, relative position of the lower incisors is an important determinant. There is a conflict of interest between the facial esthetics and the IMPA angle, which is, normal IMPA would worsen the facial profile in terms of favorable ‘Holdaway ratio’. Therefore a tooth movement inducing ‘sympheseal remodeling’ may be inevitable in many hyperdivergent faces with either Class II or Class III skeletal pattern. The rationale, technical guidelines will be explained as well.VIEW MORE
許天民 / Tian-Min Xu
Physiologic Anchorage Control: New Concept and Scientific EvidenceCV or Autobiography :Dr. Xu is a professor of orthodontics at the Peking University School of Stomatology and an adjunct professor of Case Western Reserve University. He received his postgraduate education in orthodontics at Peking University School of Stomatology from 1988 to 1992 and was a Visiting Fellow in Orthodontics at the University of California San Francisco from 1994 to 1996. He serves on OCR and EJO editorial board and AJODO editorial review board. His research interests focus on 4D orthodontics and the investigation of clinical orthodontic outcomes.
Anchorage loss in orthodontic extraction treatment is believed due to reaction of retraction of anterior teeth. However, our prospective randomized clinical trial shows anchorage loss correlated more with patient’s age and sex than with en mass vs. two-step retraction mechanics. And the total amount of anchorage loss is affected by mandible growth. We therefore propose a new concept---physiologic anchorage loss. The influence and pattern of physiologic anchorage loss is discussed and a prevention method is suggested to simplify orthodontic treatment.
周彥恆 / Yan-Heng Zhou
Invisalign Treatment for Skeletal MalocclusionCV or Autobiography :Yanheng Zhou, DDS, PhD, Adv Dip Orth. HKU, the visiting professor at University of Pennsylvania, an adjunct professor of Case Western Reserve University School of Dental Medicine, serves as the professor of the orthodontic department, and Director of Center for Craniofacial Stem Cell Research & Regeneration, Peking University School and Hospital of Stomatology. He is the Immediate-past President of Chinese Orthodontic Society and the vice president of Dental Society in Chinese Association of Plastics and Aesthetics. He is an Executive Committee Member of World Federation of Orthodontists (WFO), president of Asian Pacific Orthodontic Society (APOS), a Member of International Association for Dental Research (IADR), European Orthodontic Society (EOS), and American Association of Orthodontists (AAO).
Skeletal malocclusion is the most difficult case in Orthodontics. Traditionally, those cases are referred to oral surgeons to do Orthognathic surgery. In those cases, most difficult procedure would be the torque control, especially when we use invisalign to treat those cases. The miniscrew could be used combined with the invisalign to treat the skeletal malocclusion. The great result is achieved.
柯雯青 / Wen-Ching Ko
Surgical-Orthodontic Correction in Facial Asymmetry: Clinical Practice and Treatment LimitationCV or Autobiography :1. Professor, Graduate Institute of Craniofacial and Dental Science, Chang Gung University, Taoyuan, Taiwan
2. Attending staff, Department of Craniofacial Orthodontics, Chang Gung Memorial Hospital, Taipei and Taoyuan, Taiwan
3. Editor-in-Chief, Taiwanese Journal of Orthodontics, President, Taiwan Cleft-Palate Craniofacial Association
Facial asymmetry is commonly observed maxillofacial deformity in humans. Perfect facial symmetry is a theoretical concept that is seldom observed in the real world. Severt and Proffit reported that 40% of skeletal Class III malocclusion cases had facial asymmetry and that 85% of these cases had jaw deviation toward the left side. It is a common chief complaint while patients might have other sagittal or vertical jaw imbalance concomitantly. On the other hand, the face asymmetry might be masked by severe facial skeletal imbalance, dental malalignment, and soft tissue compensation or tilting of head posture. The treatment goals of orthognathic correction in face asymmetry should consist of correlated maxillary midline to facial midline, level oral commissures, and symmetric show of bilateral maxillary canines as well as correlated chin point to facial midline. Posteroanterior (PA) cephalograms can be used to evaluate the presence of facial asymmetry. Traditional techniques for planning OGS that entail the use of 2-dimensional (2D) X-ray films such as lateral and PA cephalograms have some limitations including magnification, distortion, and projection. Three-dimensional (3D) imaging techniques have been developed to reduce the errors and overcome the limitations of 2D techniques. During OGS preparation, the accuracy of cephalometric measurements is crucial to evaluate the presence of facial asymmetry, and 3D images can provide accurate and detailed information for evaluating the amount, location and direction of facial asymmetry. The 3D simulation of OGS plan offers a blueprint to ensure a predictable surgical outcome.VIEW MORE
曾于娟 / Yu-Chuan Tseng
Soft Tissue Pprofile, Cheek Line and Lip Appearance Changes Following Mandibular Setback SurgeryCV or Autobiography :Director
Department of orthodontics, Dental clinics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
In 1996 Dr. Tseng got dental degree from School of Dentistry, Kaohsiung Medical University (KMU). In 1998, she received Master degree and specialist training from Department of Orthodontics, Dental clinics, Kaohsiung Medical University Hospital (KMUH). In 2017, she obtained the PhD degree from School of Dentistry, College of Dental Medicine, Kaohsiung Medical University(KMU).
Dr. Tseng is an associate professor of School of Dentistry, College of Dental Medicine (KMU) and director of Department of orthodontics, Dental clinics (KMUH). She is also an active member of Taiwan Association of Orthodontics and committee member in Taiwan Board of Orthodontists.
Her major research interest relies on subjects of cephalometric analysis, TADs, soft and hard tissue change after orthognathic surgery and CBCT study.
The cheek line (face reading) is a curve-shaped line of soft tissue at the forefront of the cheek bone, and is a crucial landmark in facial esthetics. It is located between the nose and the cheek bone in the lateral view of the human face. To ameliorate the effects of underdevelopment of the midface in skeletal Class III, the maxilla is usually advanced using a Le Fort I advancement osteotomy. We have found clinically that the cheek line is advanced after isolated mandibular setback in the treatment of mandibular prognathism.
The cheilion (Ch; corners of mouth) is another important landmark in facial expressions, particularly during smiling. Chs of mandibular prognathism usually have a wider and more anterior position because of the protruding mandible. Mandibular setback surgery will changes the Ch position.
In this lecture, the following contents will be presented.
1. Cheek line changes following orthognathic surgery.
2. Improvement in lip appearance (lateral and frontal aspects) following mandibular setback surgery.VIEW MORE
黃瓊嬅 / Sabrina, Chiung-Hua Huang
Open Bite Correction - Aligners or Fixed Orthodontics?CV or Autobiography :Big Apple Dental Clinic
1. Certified orthodontist, Taiwan
2. Big Apple Dental Clinic, Tainan, Taiwan
3. Taipei Smile Dental Clinic, Taipei, Taiwan
The surgery-first approach is a new treatment paradigm for the management of dentomaxillofacial deformity. Compared to the conventional approach to orthognathic surgery, "surgery first" protocols could be advantageous in terms of shortened treatment time and immediate esthetic improvement. However, it should not be considered for patients with cleft related deformities, patients with high probability of development of CR-CO discrepancy and unilateral or bilateral cross-bite or scissor bite post-surgery. In this presentation, “surgery first” as well as effective pre-srugical orthodontic decompensation for “surgery early” protocols with meticulous planning and passive self-ligation brackets will be discussed.VIEW MORE
廖炯琳 / Johnny, Joung-Lin Liaw
Innovative Applications of TADsCV or Autobiography :Dr. Johnny Joung Lin, Liaw completed his orthodontic training at NationalTaiwan University Hospital in 1994 and received his master degree in Chang Gung University. He is now in private practice since 2002 after 8-year visiting staff in Shin Kong Memorial Hospital. He keeps on part-time teaching at National Taiwan University . He served as the President o f Taiwan Association of Orthodontists during 2013 & 2014, and Chair of Taiwan Board of Orthodontics during 2015 & 2016. His mai n interest is the pursuit of Orthodontic excellence through interdisciplinary treatment and the use of TADs. He speaks nationally and internationally to share the experience and seeks the next level on Orthodontic excellence.
AbstractInnovative Applications of TADsTADs have been utilized as reliable skeletal anchorage in our daily practice. Various sophisticated applications are demonstrated by many doctors in various situations. Although everyone has his own preferred way to use the TADs, it is still very exciting to see some innovative applications of TADs in difficult situations. The author is interested in exploring the use of TADs for problem-solving to achieve orthodontic excellence.Give me a lever, we shall correct the transpositions. With two lever arms, en-masse retraction with maximal anchorage could be achieved. Expand your mind and stuck on you! Innovative applications of TADs would be discussed and shared with case demonstrations.VIEW MORE
許勝評 / Sam, Sheng-Pin Hsu
The Beauty of 3D Orthodontics -- Less Trouble and More ExcitementCV or Autobiography :1. Assistant Professor, Department of Craniofacial Orthodontics, Chang Gung Memorial Hospital2. Fellowship, Surgical Planning Laboratory, Department of Oral and Maxillofacial Surgery, The Methodist Hospital Research Institute, Houston Texas
Recent years, more and more 3D imaging involves dental and orthodontic treatment. Cone-beam computer tomography (CBCT) with large Field of View (FOV) not only gives more information of teeth but also a better depiction of craniofacial skeleton. Furthermore, Some treatment-related anatomic structure such as airway space can be precisely assessed. Digital dental models obtained with intra-oral scanners can be used for virtual model setup, facilitates diagnosis and adequate treatment plan. 3D facial photos provides a comprehensive soft tissue evaluation. The visual treatment simulation also makes a better patient consultation and communication. In the talk, several orthodontic cases related to TADs/ Impaction Tooth/ Surgery-first approach/ Obstructive Sleep Apnea/ Digital Smile Design will be presented to show the utilization of 3D imaging in daily orthodontic practice. The benefits will also be explained.VIEW MORE
張文忠 / Kelvin,Wen-Chung Chang
Interdisciplinary Treatment in Digital EraCV or Autobiography :1996 DDS degree from School of Dentistry, National Taiwan University, Taipei, Taiwan
2003 Certificate of orthodontic training, orthodontic department of National Taiwan University Hospital
2005 MS degree from Graduate Institute of Clinical Dentistry, National Taiwan University, Taipei, Taiwan
Dr. Kelvin, Wen-Chung Chang is a visiting clinical instructor in the orthodontic department at National Taiwan University Hospital since 2004. He held a private group practice center in Hsinchu, Taiwan in 2007. He is the chairman of the academic committee of Taiwan Association of Orthodontists (2016-2018) and an advisor of the World Implant Orthodontic Association since 2016. His interests focus on self-ligation system, TADs application, interdisciplinary treatment, aesthetic dentistry and digital orthodontics.
In the digital era today, technology continuously changes the way we think and act. The digital world has rapidly improved every industry and profession.
What is “Digital Orthodontics”? It is not just clear aligner treatment or alternatives to plaster models. Digital Orthodontics is here to stay. The digital image, digital intraoral scanning, CAD dental software and 3D printing is transforming the traditional workflows. More and more applications are introduced with enhanced speed, precision, efficiency and lower cost. In this new way to practice, every orthodontist can choose the proper solution to meet their requirements.
We must still remember that digital orthodontics is just a tool. A tool to enhance our treatment quality and patients’ welfare. The key to success is still reliant on the person who makesVIEW MORE
曾應魁 / Ying-Kwei Tseng
Vertical Problem: Anterior Open Bite Innovation & BeyondCV or Autobiography :Graduate in Orthodontic Department, School of Dentistry, Fairleigh Dickinson University, New Jersey, U.S.A. (1) President & Consultant, Taiwan Orthodontic Association (2) President, 3rd Asian-Pacific Orthodontic Conference (3) Examiner, Conjoint Examination for Membership in Orthodontics By the Royal College of Surgeons of Edinburgh (4) International Advisor, Official Journal of the Japanese Orthodontic Society (5) President, of Taiwan International College of Dentists (6) Currently Maintains Private Practice in Orthodontics in Taipei, Taiwan.
Vertical discrepancies are complex and multifactorial problems. In particular, the treatment and maintenance of deep bite have proven to be one of the major challenges for orthodontists.
Over the past 20 years, many deep bite-related articles have been published including craniofacial and dentoalveolar morphologies, different types of mechanotherapy, and retention methods.
To extract or not, has been a subject of debate. It’s a decision that relies on accurate diagnosis which depends on knowledge and experience to analyze multiple factors contributing to the issue.
Treatment mechanics to reduce deep overbite include the implementation of tip back bend wire, reverse curve wire, or mini-screws (TADs) to intrude maxillary or mandible incisors.
But too much force to the incisors will impinge on the gingiva and cause a localized inflammation of the tissue. In addition, it may also cause resorption starting from the apex of the incisor root. These undesirable results may be considered malpractice.
Craniofacial morphology plays an important role in deep bite correction and retention but is often overshadowed by the application of mechanical forces. However, the excessive mechanical forces to achieve maxillary or mandibular incisor intrusion is not a lasting solution and the corrected deep bite will inevitably revert to the original state.
Management of deep overbite should not be restricted to the use of mechanical force. Today, I will talk about the importance of craniofacial morphology in the treatment of deep overbite cases, and the key factors to maintain the stability of corrected deep bite.VIEW MORE
鄭信忠 / Johnson, Hsin-Chang Cheng
The Challenges of Orthodontic Treatments on the Congenitally Missing One or Two Lower Incisor CasesCV or Autobiography :1. Dean and Professor, College of Oral Medicine, Taipei Medical University
2. Director, Orthodontic Department, Taipei Medical University Hospital
3. Immediate Past President, Taiwan Association of Orthodontists
Though the prevalence rate of congenital missing on lower incisor(s) is about 0.23-8.6%, the orthodontic treatments on these cases are troublesome and challengeable. The problems faced such as the correlation of congenital lower incisors and malocclusion/ dentofacial morphology, the decision of extraction or nonextraction, the teeth positon and numbers in extraction orthodontic treatment, the discrepancies of teeth size, the establishment of ideal occlusion interdigitation…, etc. This report will present different kinds of orthodontic treatment on these troublesome cases with congenitally missing lower incisor(s). The cohort clinical study was also performed to analyze over 120 orthodontic cases with congenitally missing one or two lower incisor(s). The research results will offer a treatment guideline and principle for these cases.VIEW MORE
Gummy Smile CorrectionCV or Autobiography :1. Dr. Chris Chang is the founder of Beethoven Orthodontic Center and Newton’s A Inc. in Hsinchu, Taiwan.2. He received his PhD in Bone Physiology and Certificate in Orthodontics from Indiana University.3. He is a diplomate of the American Board of Orthodontics and an active member of Angle Society-Midwest.4. Dr. Chang is the publisher of JDO and has authored and co-authored many orthodontic books, including Orthodontics Vols. 1-6, as well as Words of Wisdom, Jobsology and Trumpology.5.He is the inventor of OrthoBoneScrews(OBS®).
The upper whole arch intrusion and retraction by Temporary Anchorage Devices (TADs) has been proved to be an effective way to improve the esthetics of gummy smile. This lecture will present the diagnosis and treatment planning of gummy smile. Detailed mechanics and screw insertiontechniques will be introduced. The rationales for surgical crown lengthening to enhance the anterior esthetics will also be discussed.VIEW MORE
劉人文 / Eric, Jein-Wein Liou
Orthodontic Treatment for Facial Asymmetry by Using Yin-Yang Archwire and Bite RaiserCV or Autobiography :Dr. Eric Liou is an associate professor and the chairman of the Faculty of Dentistry, Chang Gung Memorial Hospital & Chang Gung University, Taipei, Taiwan. He is also a visiting professor in the Department of Orthodontics, Showa University, Tokyo, Japan. For the profession affiliations, Dr. Liou is currently president of the Taiwan association of Orthodontists, and president of the World Implant Orthodontic Association. His main research interests are distraction osteogenesis, TADs, orthodontic tooth movement, platelet rich plasma, and bone physiology. Dr. Liou has numerous publications and presentations, specially on the topics of accelerated orthodontic tooth movement, maxillary orthopedic protraction, surgery first accelerated orthognathic surgery, and TADs.
Improvement of an occlusal cant together with lip cant and chin deviation is considered not possible merely through orthodontic treatment. Orthognathic surgery combined with surgical orthodontics, therefore, has been considered as the only treatment modality for improving the occlusal cant, skeletal, and soft tissue asymmetry. For the improvement of an occlusal cant, orthodontic approaches such as the temporary anchorage devices, auxiliary intrusion arches, cantilever-typed springs, high-pull headgear, posterior bite blocks, or active magnetic vertical correctors have been applying nonsurgically. Recently, Yin-Yang wire has been developed for a much more user- and patient-friendly improvement of an occlusal cant. However, the improvement for chin deviation has not been possible merely through orthodontic treatment. The purpose of this presentation is to illustrate a possible new field in orthodontics for a non-invasive improvement of occlusal cant and facial asymmetry through combination applications of Yin-Yang archwire and bite raiser/slope. The development and mechanics of the Yin-Yang archwire, bite raiser, the role of TMJ disc displacement in mandibular asymmetry and how to improve TMJ clicking will be explored.VIEW MORE
林錦榮 / John Jin-Jong Lin
Think twice before you extract: the role of auto tooth transplantation in orthodontics.CV or Autobiography :M.S and Certificate in Orthodontics, Marquette University (USA) (Orthodontic Graduate Program)
2000~2002: President of the Taiwan Association of Orthodontists
2004~present: Clinical Professor, Taipei Medical University (Orthodontic Department)
In orthodontics extraction is a common method to relieve dental crowding or protrusion, even though nowadays due to the use of TADs the extraction rate is much lower than before, extraction is still needed in some occasions.
Extraction of the 3rd molars used to be a routine procedure on the post ortho follow up patients.Unless there are caries , space deficiency, pericoronitis etc ..problems, if the 3 rd molar are well aligned, there is no need to remove it.Especially in the mutilated dentition, by auto tooth transplantation the 3rd molar can replace the poorly prognosis molar .
Not only the 3rd molar, whenever the extraction is indicated, the use of the extraction tooth for auto tooth transplantation should always be considered to avoid the waste of a good tooth.
With the modern CBCT imaging, the 3D print of the donor tooth for auto tooth transplantation is very useful for checking the recipient site, so the PDL of the donor tooth can be preserved well to increase the success rate of transplantation.
Auto tooth transplantation is much better than the dental implant, the former is more economic in price, can grow bone, can be orthodontically moved.
Before routine extraction of tooth, should always think about the possibility of auto tooth transplantation to avoid waste of the good tooth.
In this presentation, plenty of cases will be used to demonstrate the role of orthodontist in auto tooth transplantation.
張毓仁 / Yu-Jen Chang
Role of Orthodontist in Craniofacial Anomalies CareCV or Autobiography :1.Master of Medical Science, Graduate Institute of Dental and Craniofacial Science, College of Medicine, Chang Gung University, Taiwan
2.Director, Department of Craniofacial Orthodontics, Kaohsiung Chang Gung Memorial Hospital, Taiwan
3.Vice Chairman of Academic Committee of Taiwan Association of Orthodontists (TAO)
4.Assistant Professor, certificated by Ministry of Education, Taiwan
Dr. Yu-Jen Chang now is a consultant orthodontist and the Director of the Craniofacial Orthodontic Department at Kaohsiung Chang Gung Memorial Hospital (KCGMH), Taiwan and he was also the Vice Chair, department of dentistry at KCGMH between 2016 to 2018. He is the vice chairman of the academic committee of Taiwan Association of Orthodontists (TAO) since 2016. Furthermore, he is the council of Taiwan Board of Orthodontics since 2019. In 2015, Dr. Chang had one-year clinical fellowship of Univ. of Kentucky, and also a visiting scholar of 3D image lab., Univ. of Michigan. He is now continuing his Affiliate member in E. H. Angle Society, Midwest Component since 2020. His interests focus on craniofacial deformity especially CLCP and HFM patients’ treatment (surgical orthodontics, maxilla distraction osteogenesis, and naso-alveloar-molding (NAM) in cleft baby), TADs application, interdisciplinary treatment, aesthetic dentistry and digital orthodontics.