齒顎矯正協會-TJO

Issue Highlights

Review Article

Vol.31-1-1 March 2019

Diagnosis and Management of Impacted Maxillary Canines

Yu-Cheng Hsu, Chia-Tze Kao, Chih-Chen Chou, Wen-Ken Tai, Po-Yu Yang

Maxillary canines play an important role in facial esthetics, since the canine eminence can support the alar and the upper lip. Impacted maxillary canines is a common problem which requires multidisciplinary diagnosis and treatment in dental clinic. The aim of this review is to integrate the studies that include clinical diagnosis and guidelines for management of canine impaction.
Review Article

Vol.31-1-2 March 2019

Accuracy of Different Sequencing in Bimaxillary Orthognathic Surgery: A Systematic Review and Meta-analysis

Thatchawee Borikanphanitphaisan, Ellen Wen-Ching Ko

Introduction: Compared to the classic maxilla-first sequence in bimaxillary orthognathic surgery,
inverted mandible-sequence has been encouraged for potentially higher accuracy. However, evidence regarding
this topic is lacking. Methods: A systematic review of the literature on different sequencing of bimaxillary
surgery was conducted, gathering from following databases: Cochrane, Pubmed, Scopus, Medline (Ovid),
Web of Science, ScienceDirect. Articles mentioning “sequencing”, “mandible-first”, “orthognathic surgery”
of at least case-report level of evidence were included without restriction. Relevant articles were included
for quality assessment and extracted data for indications of mandible-first sequence from all studies. Metaanalysis of surgical accuracy at upper central incisors in horizontal and vertical dimension was performed from
included experimental studies. Results: The search of initially 619 articles resulted in 9 final articles: 6 case
reports and 3 experimental studies. The four most commonly listed indications for mandible-first approach
included instability of condylar centric relation (CR) position, posterior maxillary downgrafting, when rigid
fixation of maxilla cannot be ascertained, and large maxillomandibular advancements. The pooled analysis of
experimental studies composed of 188 patients (122 females, 66 males). Quality assessment of these studies
resulted as moderate. Meta-analysis revealed no difference of surgical accuracy between both sequencing,
with considerable heterogeneity. Conclusion: Mandible-first approach has been advocated under certain
indications, in order to reduce potential jaw repositioning error and ease of surgical manipulation. Differences
were not found in maxilla repositioning at central incisors, horizontally and vertically between both approaches.
However, the results should be taken with caution because of heterogeneity in study design and outcome
measurements. (Taiwanese Journal of Orthodontics. 31(1): 12-23, 2019)
Case Report

Vol.31-1-3 March 2019

Use the Lip Bumper Appliance to Control the Lower Lip Biting Habit

Chun-Yu Chen,1,2 Chia-Tze Kao,1,2 Yu-Tin Wu,1,2 Chih-Chen Chou,1,2 Jui-Hsien Yang3

This is a 9 years old boy in mixed dentition stage, with Angle Class I malocclusion, anterior teeth crowding and proclined upper incisors. He was diagnosed with lower lip biting habit. The treatment plan was delivered with two stages treatment, stage 1 was to correct the lip biting habit by using the lip bumper. After four-month observation and lip training, the habit was corrected and the irregularity of lower dentition was decreased. Continued with stage 2 treatment, patient had upper and lower 2x4 fixed appliances to align and level the anterior teeth. The result showed the previous proclined upper incisors were moved palatally, and the lower incisors were moved labially after 3 months of treatment. The total treatment duration was 8 months.
Case Report

Vol.31-1-4 March 2019

Management of Congenital Missing in Bilateral Mandibular Incisors

Yun-Ting Huang, Chien-Wei Chao, Po-Yu Yang, Chia-Tze Kao

This case report described the management of congenital missing bilateral mandibular central incisors in a 16 years-old female patient who was diagnosed as Angle’s Class I molar malocclusion, canine Class II relationship by a treatment plan of orthodontic space regain. The options of fixed bridge, removable partial denture or dental implants to replace the missing teeth were well explained to the patient by prosthodontic consultation. After the orthodontic alignment, the treatment results demonstrated that the initial profile of the patient was maintained, the missing teeth was later replaced by removable partial denture. The interdisciplinary therapy between orthodontics and prosthodontics should be addressed in cases with hypodontia.
Case Report

Vol.31-1-5 March 2019

Orthodontic Correction of Transposed Maxillary Canine and First Premolar in Mixed Dentition

Lan-Tien Lin, Yi-Min Liu, Yuen-Yung Tsang

Transposition is rare and occurred commonly on maxillary canine and premolar. To extract or not to
extract, to correct or not to correct the dental transposition teeth, it’s a tough decision. A 12-year-old boy was
referred for orthodontic correction because of bad alignment at upper dentition. His dental age was in late
mixed dentition. Both upper deciduous canines were still retained. Left canine was buccally blocked-out, and
first premolar was in palatal crossbite with the lower premolars. Panoramic film showed impacted upper right
canine and transposed left canine and first premolar. The treatment duration took 3.5 years. The upper left
canine and the first premolar were aligned in correction of tooth position. In addition, the impacted upper
right canine was successfully exposed and aligned. The consideration of treatment plan should include factors
like positions of the crowns and roots, gingival line, smile esthetics, occlusal interferences and treatment
duration. It is important to avoid root interference and root resorption during tooth movement. Bucco-lingual
root inclination and soft tissue management should be addressed during correction of the dental transposition.
Case Report

Vol.31-1-6 March 2019

The Orthodontic Treatment of Class III Malocclusion with Anterior Cross bite and Severe deep bite

Chieh Yang, Yu-Chuan Tseng

This 22-year-old female presents with skeletal Class III malocclusion, complicated by anterior cross bite, deep bite, and congenital missing of bilateral mandibular second premolars. The treatment modality was full-mouth fixed edgewise appliances. A favorable result of ideal overbite and overjet and closure of bilateral spaces of missing teeth were achieved. The patient was satisfied the improvement of function and esthetics after treatment.

Editorial Board

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Editor-in-Chief

KO, ELLEN WEN-CHING

Associate Editors

YAO, CHUNG-CHEN LU, TAI-LIANG WANG, YU-CHIH

Editorial Committee

KAO, CHIA-TZE LIU, JIA-KUANG TSAI, CHI-YANG YU, JIAN-HONG LI, CHUNG-HSING TSENG, YU-CHUAN WU, TZU-YING
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