Orthodontic Treatment Need and the Psychosocial Impact of Malocclusion in 12-Year-Old Hong Kong Children.

Objectives: To determine the prevalence of orthodontic treatment need in 12-year-old children in Hong Kong and its relationship with the psychosocial impact of malocclusion and to assess their associations with sociodemographic factors.

Materials And Methods: A random sample of 687 12-year-old children was recruited from 45 secondary schools in Hong Kong. Orthodontic treatment need was assessed on study models by five indices: the Dental Health Component of the Index of Orthodontic Treatment Need (IOTN-DHC), the Aesthetic Component of the IOTN (IOTN-AC), the Dental Aesthetic Index (DAI), the Index of Complexity Outcome and Need (ICON), and the Peer Assessment Rating (PAR).

Mechanical and biological evaluations of novel electrospun PLLA composite scaffolds doped with oxide ceramics.

The objective of this study is to evaluate the in vitro performance of the novel electrospun composite scaffolds that are made of 10% PLLA in binary solvents (75 vol% dichloromethane: 25 vol% acetone) doped with 0.1 wt% of oxide ceramic powders (Hafnium dioxide (HfO), titanium dioxide (TiO), zirconium dioxide (ZrO) and silicon dioxide (SiO)). These composite scaffolds were characterized microscopically (SEM, TEM and EDX), mechanically (Vickers hardness and tensile strength) and in in vitro cell studies (biomineralization, protein absorption, and cytocompatibility) with MC3T3 pre-osteoblasts.

A Comparative Analysis of Tooth Size Discrepancy between Male and Female Subjects Presenting with a Class I Malocclusion.

Objectives: To evaluate the tooth size discrepancy and Bolton's ratios between male and female subjects with a Class I malocclusion.

Materials And Methods: The digital e-models of 100 male and 100 female 12-year-old southern Chinese children with a Class I malocclusion were selected. The mesiodistal widths from permanent first molar to the contralateral side first molar of the upper and lower dentitions were measured.

Digital Models as an Alternative to Plaster Casts in Assessment of Orthodontic Treatment Outcomes.

Objective: This study aimed to compare the use of digital models and plaster casts in assessing the improvement in occlusion following orthodontic treatment.

Materials And Methods: Digital models and plaster casts of 39 consecutive patients at pre- and posttreatment stages were obtained and assessed using the Peer Assessment Rating (PAR) index and the Index of Complexity and Treatment Need (ICON). PAR and ICON scores were compared at individual and group levels.

Dental Arch Relationships and Reverse Headgear Effects in Southern Chinese Patients with Unilateral Cleft Lip and Palate: A Retrospective Study.

Objective: To evaluate the severity of the dental arch relationships and the treatment outcomes of reverse headgear (RHG) in southern Chinese patients with unilateral cleft lip and palate (UCLP).

Design: A retrospective study.

Setting: Faculty of Dentistry, The University of Hong Kong.

Frontal facial proportions of 12-year-old southern Chinese: a photogrammetric study.

This study aimed to establish norm values for facial proportion indices among 12-year-old southern Chinese children, to determine lower facial proportion, and to identify gender differences in facial proportions.A random population sample of 514 children was recruited. Fifteen facial landmarks were plotted with ImageJ (V1.

Change of mandibular position during two-phase orthodontic treatment of skeletal class II in the Chinese population.

The aim of this study was to evaluate the change in mandibular position during a two-phase orthodontic treatment of skeletal Class II malocclusion. Thirty consecutively treated Chinese male adolescents who had undergone two-phase treatment with Herbst appliance and fixed appliance and fulfilled the specific selection criteria were sampled. Cephalograms taken at T0 (before treatment), T1 (at the end of functional appliance treatment), and T2 (at the end of fixed appliance treatment) were analyzed.

The role of traditional Chinese medicines in osteogenesis and angiogenesis.

The article aims to review various Traditional Chinese Medicines (TCMs) with both osteogenic and angiogenic effects, alone and in combination, and to consider whether these TCMs promote osteogenesis via angiogenesis and vascular endothelial growth factor (VEGF). Each of the TCMs involving in osteogenesis was searched through PubMed and CBMdisc using its Latin name and English name, and keywords such as 'osteogenesis', 'bone', 'osteoblast', 'angiogenesis', 'VEGF' were used. A total of 241 articles were screened from PubMed and CBMdisc.

Analysis of genetic polymorphisms in skeletal Class I crowding.

Introduction: Dental crowding is a problem for both adolescents and adults in modern society. The purpose of this research was to identify single nucleotide polymorphisms (SNPs) responsible for crowding in subjects with skeletal Class I relationships.

Methods: The case subjects consisted of healthy Chinese people living in Hong Kong with skeletal Class I relationships and at least 5 mm of crowding in either arch.

Sagittal and vertical occlusal cephalometric analyses of Pancherz: Norms for Chinese children.

Introduction: The aims of this research were to establish norms for the sagittal and vertical occlusal cephalometric analyses of Pancherz for Chinese children and compare them with those of a matched white sample.

Methods: The material comprised lateral cephalograms of a random sample of 405 southern Chinese children (age, 12 years; 200 boys, 205 girls) and an additional sample of 86 British white children (age, 12 years; 43 boys, 43 girls) in Hong Kong. The radiographs were digitized twice.

The Hybrid Orthodontic Treatment System (HOTS).

This paper describes the Hybrid Orthodontic Treatment System (HOTS), an innovative method used in first premolar extraction cases. It comprises the following three components: (1) a miniscrew, (2) dual-dimension wires, and (3) multiloop edgewise archwires. HOTS consists of four clearly defined treatment steps: (1) setup, (2) leveling, (3) separate but simultaneous anterior and canine teeth retraction, and (4) final adjustment.

Identification of the chondrogenic pathway in the mandibular condylar cartilage.

To identify genetic expression of mandibular condylar cartilage during natural growth and under mechanical strain as a result of mandibular advancement. One hundred and forty four 35 days old female Sprague-Dawley rats were sacrificed on 8 different experimental days. Total RNA was extracted for oligonucleotide microarray gene chips containing 15,923 transcripts.

Versatility of skeletal anchorage in orthodontics.

The purpose of this article is to update clinicians on the current concepts and versatile uses and clinical applications of skeletal anchorage in orthodontics. Topics discussed include clinical indications, implant types, surgical sites, biomechanics, treatment time, and treatment outcomes.

Use of miniscrews and miniplates in orthodontics.

Paradigms have started to shift in the orthodontic world since the introduction of mini-implants in the anchorage armamentarium. For example, miniscrews have allowed the management of wider discrepancies than those treatable by conventional biomechanics because force can be applied directly from the bone-borne anchor unit. Therefore, miniscrews not only free orthodontists from anchorage-demanding cases, but they also enable clinicians to have good control over tooth movement in 3 dimensions.

Maxillary second molar extractions in orthodontic treatment.

This article is a review of the rationales, indications, methods, and effects of orthodontic treatment with maxillary second molar extractions. In addition to the patient's malocclusion, specific considerations about the status and position of the maxillary second and third molars should be taken into account. In recent years, the development of temporary anchorage devices, in addition to extraoral traction and intraoral distalization appliances, has become another armamentarium in the distalization of the maxillary posterior teeth, which may affect the selection of teeth to be extracted from second to third molars.