Vol.30-4-7 December 2018
Decision Making on Tooth Extraction in Orthodontics
Extraction or non-extraction is an issue that we face in our daily orthodontic practice. Before deciding the
treatment plan, we have to examine the case carefully. Orthodontic tooth extraction involves more than just the
need to create space in the arches but also the concerns of facial esthetics and treatment stability. The report
presented a case of teenage boy with severe external root resorption of tooth 27, 37, 46, 47 which caused
by impaction of third molars and a supernumerary premolar. Patient already had orthodontic treat-ment
before and did not favor a comprehensive orthodontic treatment again. Tooth extraction of 27, 37, 47 and the
supernumerary premolar were conducted. The lingual holding arch with hook was used to upright the mesially
erupted third molar. The opinion and philosophy of the tooth extraction decision making was discussed.
(Taiwanese Journal of Orthodontics. 30(4): 247-255, 2018)
Vol.30-3-1 September 2018
Effect of Home Bleaching Agents on the Surface Corrosion of Stainless Steel Orthodontic Brackets
This in vitro study evaluates the home bleaching treatment effect on the surface corrosion of stainless steel orthodontic brackets.
Cephalometric Analysis of Growth and Treatment with “the Structural Technique: A review of its background and clinical application
Ib Leth Nielsen
The aim of this review is to provide the fundamental basis and scientific evidence for the so-called “Structural Technique.” In this article we will discuss the benefits and challenges this technique presents and compare it to the so-called “best fit” technique. Furthermore, we will introduce the three parts of the analysis, most commonly used for evaluation of growth and treatment changes. The “Structural technique” developed by Professor Arne Björk and his associate Dr. Vibeke Skieller is the result of their longitudinal studies using metallic implants as biological markers.
Vol.30-3-2 September 2018
Orthodontic Correction of Class II Division 2 Malocclusion
Class II division 2 malocclusion has low incidence rate of only 1% in Taiwan. The criteria of diagnosis and treatment consideration is more challenging as compared to other types of malocclusions. The consideration of orthodontic biomechanics could be sophisticated in facing the correction of the molar relationship and the angulation of the anterior teeth. This article discusses the clinical diagnosis and treatment mechanics of Class II division 2 malocclusion.
Surgical Occlusion Setup in Orthognathic Surgery Using Surgery-first Approach for Skeletal Class III Deformity: A Systematic Review
Shu Hsien Lo, DDS, Yu-Fang Liao, DDS, PhD
Surgery-first orthognathic surgery is increasing in popularity because of reduced treatment time, efficient tooth decompensation, and early improvement in facial esthetics. However, it remains difficult due to the surgical occlusion setup. We systematically reviewed the literature in order to determine the guidelines used for surgical occlusion setup in orthognathic-first surgery for skeletal Class III deformity.
Vol.30-3-3 September 2018
An Overview of Digital Intraoral Scanners: Past, Present and Future - From an Orthodontic Perspective
Digital intraoral scanners(IOSs) have become the ongoing trend in contemporary digital orthodontics. This article aims to elaborate the past, present, and future of IOSs from an orthodontist’s perspective. We summarized the comparison between digital and conventional impression in literatures. Also, we discussed about the imaging principles and characteristics of different IOSs. Although unable to recommend the single best option, a checklist of consideration when choosing an IOSs was developed after trailing the mainstream commercial products. With technology revolution, embracing the IOSs may be essential for those interested in future digital orthodontic workflow.
Maxillary Expansion: From Past to Present
Shih-Chieh Chen, Hong-Po Chang, Yu-Chuan Tseng
Maxillary expansion is a common treatment option for upper crowded dentition and posterior lingual crossbite in children and adolescents. As the midpalatal suture is not yet completely interlocked at these ages, the midpalatal suture can be opened via maxillary expansion to increase the length and width of the upper arch. This solves the problems of posterior crossbite and upper crowded dentition. Since the midpalatal suture is stiff in adults, many clinicians believe that adults require surgical intervention to achieve maxillary expansion. However, recent reports indicated that several cases have been treated successfully with the aid of TADs for maxillary expansion. This article discusses the various protocols for performing maxillary expansion from past to present.
Vol.30-3-4 September 2018
Clinical Use of Contemporary Clear Aligner Therapy
Clear aligner therapy (CAT) is an increasing popular alternative to conventional bracket therapy. This review summarized contemporary data regarding the history of CAT. The information regarding the advantages and disadvantages of CAT, biomechanical force and biological considerations, controlling orthodontic tooth movement (OTM) would be discussed in this review. The CAT is well accepted for their esthetics, comfort, good care of oral hygiene and periodontal status and suitable for interdisciplinary dental treatment. However, CAT was also considered as difficult compliance for the patients, uneasy to be handled by clinicians, unprecise root movement, difficult for the postoperative fixation in cases receiving orthognathic surgery, and high cost.
Curve of Spee: Development and Orthodontic Leveling
Yu-Hsin Lee, Yu-Chuan Tseng
Curve of Spee (CoS) is characterized as human occlusal curvature viewed in the sagittal plane. This naturally occurring phenomenon has clinical importance in orthodontics and prosthodontic dentistry. The purpose of this article is to examine the formation of the CoS regarding of when, how, or why the CoS develops. The mechanism of leveling the CoS was discussed.
Vol.30-3-5 September 2018
Surgical-orthodontic Treatment for a Patient with Skeletal Class III Deformity and Anterior Open Bite
Anterior open bite is a complicated problem due to its multiple etiologies, including anatomical, environmental, and genetic factors. The complexity of skeletal class III deformity depends on the severity of bony discrepancy, especially with anterior open bite. Surgical-orthodontic treatment is often required for complete correction.
Correction of Bimaxillary Protrusion by Extraction of Incisors and Canine Substitution
Chung-Li Wang, Chun-Liang Kuo, I-Hua Liu, Chun-Hsiu Yang
The maxillary six anterior teeth play important roles in esthetics and functions. Treatments for missing maxillary lateral incisors either by space closure or space preservation need multiple clinical considerations. This case report presents an orthodontic treatment of a 33-year-old female patient who had a convex profile with lip incompetence, missing lower molars and poor prognosis of bilateral maxillary lateral incisors. The atypical extraction in treatment plan consisted of removing lateral incisors instead of premolars to retract the anterior teeth. The improvement of facial profile and lip posture was achieved and the anterior teeth esthetics was further rehabilitated with prosthesis. After 28-month of treatment duration, the patient was satisfied with treatment results.
Vol.30-3-6 September 2018
Use Improved Super-elastic Ti-Ni Alloy Wire to Correct Class II Division 2 Malocclusion with Unstable Mandibular Position
The case reported the use of improved super-elastic Ti-Ni alloy wire (ISW), which was developed by Tokyo Medical and Dental University, to correct a case of Angle Class II division 2 case with unstable mandibular position. An adult 28-year old women came to our clinic with a chief complaint of poor dental alignment. Clinical examination revealed a Class II division 2 malocclusion. The ISW was used to relieve the anterior deep bite and crowding. Intermaxillary elastics (IMEs) were also used to achieve a correct and stable mandibular position and solid interdigitation. The outcome indicated achievement in correction of arch coordination, space management and bite control. In this case, poor dental alignment was rapidly leveled by using ISW. ISW could provide an efficient multidimensional control of this particular malocclusion. After the treatment, the treatment goals were achieved and the patient was pleased with the treatment result.