[Comparison of skeletal structure of temporomandibular joint through cone-beam CT between Angle ClassⅠ, Ⅱ, Ⅱ, Ⅲ malocclusion patients with permanent dentition].

Purpose: To compare characteristics of temporomandibular joint and related structures according to gender and Angle Ⅰ, Ⅱ, Ⅱ and Ⅲ class.

Methods: Cone-beam CT (CBCT) was performed in 123 patients with malocclusion, and three-dimensional reconstruction was performed with Mimics 19.0 software.

[A study on effects of unilateral maxillary canine impaction on the dento-maxillofacial three-dimensional structure].

Purpose: To investigate the three-dimensional structure characteristics of unilateral impacted teeth by cone-beam CT (CBCT), and to evaluate the risk factors for upper impacted teeth, so as to provide evidence for early clinical intervention in orthodontics.

Methods: Thirty patients with unilateral maxillary canine impaction were included. Their CBCT images were measured by three-dimensional reconstruction of Romexis software.

[Features and influence of impacted maxillary permanent canine on surrounding structures].

Impacted maxillary permanent canine is the tooth that most commonly fails to erupt after the third molars. It can probably affect the dental arch alignment and form, occlusal function and facial profile as well. In this review, the epidemiology, etiology and influence on surrounding tissue of the impacted maxillary permanent canine were analyzed based on related literatures with the hope of providing references for clinical practice.

[Torque control evaluated by lateral cephalometric radiography and cone-beam CT after retraction of the upper anterior teeth].

Purpose: To investigate the relationship between torque control and movement type of the teeth and to investigate the correlation between reconstruction of the alveolar bone and retraction of the upper anterior teeth.

Methods: Cephalograms of pre-treatment and post-treatment of 111 cases and cone-beam computed tomography of pre-retraction and post-retraction of 7 cases were collected. The inclination degree of the upper anterior teeth, the horizontal and vertical displacement of edge and apex,and the thickness of the alveolar bone at the apex level were measured.

Bond strength of metal brackets bonded to a silica-based ceramic with light-cured adhesive : Influence of various surface treatment methods.

Objective: The purpose of this work was to evaluate the effects of several surface treatment methods on the shear bond strengths of metal brackets bonded to a silica-based ceramic with a light-cured adhesive.

Materials And Methods: Silica-based ceramic (IPS Classic(®)) with glazed surfaces was cut into discs that were used as substrates. A total of 80 specimens were randomly divided into four groups according to the method used: 9.

[The relationship between the movement type during retracting the anterior teeth and the external apical root resorption and its evaluation methods].

External apical root resorption was a common phenomenon associated with orthodontic treatment. The reported incidence ranged from 0% to 100%. It was caused by several factors, which could be mainly divided into biological and mechanical aspects.

Shear bond strength of an experimental composite bracket.

Objective: The in vitro shear bond strength of MZ100 brackets (an experimental composite bracket developed by the Dental Biomaterial Laboratory at Boston University) and the effect of different treatment methods on these brackets were evaluated.

Materials And Methods: As the bonding substrates, 80 Vitablocs® Mark II (Vident, Brea, CA, USA) were chosen. Three treatment methods were employed on 60 MZ100 bracket bases (20 brackets per treatment): silane coupling agent (Porcelain Primer; Ormco, Orange, CA, USA), sandblasting (Basic Professional Model Sandblaster; Renfert GmbH, Germany), and non-treatment.

Effects of lithium on extraction socket healing in rats assessed with micro-computed tomography.

Objective: Lithium is an activator of β-catenin signaling and β-catenin plays an important role in regulating bone formation and remodeling. The purpose of this study was to investigate the effects of lithium on bone repair in tooth extraction sockets in rats.

Material And Methods: Twenty male Wistar rats were subjected to maxillary left second molar extraction.

[Research on Chinese orthodontic specialists' subjective evaluation of orthodontic treatment outcome].

Objective: To analyze the results of multiple Chinese orthodontic specialists' subjective evaluation of orthodontic treatment outcome, to investigate the relevance of different experiment items and to explore the weight of each monomial material.

Methods: As a randomized clinical trial, with six orthodontic treatment centers and Angle's classification being regarded as two stratification factors, it contained 108 cases with integrity data, which was random extracted from 2383 cases that received orthodontic treatment in six orthodontic treatment centers during the past five years, gathering post-treatment study casts, cephalometrics and photographs of 48 cases as the research subject. Similarly taking Angle's classification as a stratification factor, 108 cases were randomly divided into 9 groups.

Impact of rapid maxillary expansion in unilateral cleft lip and palate patients after secondary alveolar bone grafting: review and case report.

The purpose of this article was to analyze the effects and short-term stability of rapid maxillary expansion performed after secondary alveolar bone grafting in unilateral cleft lip and palate (UCLP) patients. Two UCLP patients with severe maxillary constriction who had previous bone grafting were involved in this study. A hyrax rapid expansion appliance was placed on 4 abutment teeth and activated twice daily.

[Review of the impact of orthodontic treatments on soft tissue profile].

There are some people who have demands on the soft tissue profile among the patients who search for even teeth.On the other hand,when drawing up a plan,orthodontists will consider the soft tissue analysis.This review is focused on the assessment way of soft tissue profile,impact of orthodontic treatments such as functional appliances, extraction treatment, etc on the profile.

[Presurgical alveolar molding using computer aided design in infants with unilateral complete cleft lip and palate].

Purpose: To establish a new method of presurgical alveolar molding using computer aided design(CAD) in infants with complete unilateral cleft lip and palate (UCLP).

Methods: Ten infants with complete UCLP were recruited. A maxillary impression was taken at the first examination after birth.

[Study on the teaching mode and quality management of orthodontic education in undergraduates].

Orthodontic teaching, especially in undergraduates is the most difficult part in dental education, not only on the aspect of theoretical teaching covering a wide range of disciplines in limited teaching hours, but also their application in clinical practice. With the aim of training qualified dental practitioner with global competitiveness, improving the quality of training curriculum, the Orthodontic Department of Shanghai Jiao Tong University College of Stomatology has persisted in researching and reforming the teaching system. This paper described the current situation of orthodontic teaching and the concept of quality management.

A novel technique for presurgical nasoalveolar molding using computer-aided reverse engineering and rapid prototyping.

Objective: To establish a new method of presurgical nasoalveolar molding (NAM) using computer-aided reverse engineering and rapid prototyping technique in infants with unilateral cleft lip and palate (UCLP).

Methods: Five infants (2 males and 3 females with mean age of 1.2 w) with complete UCLP were recruited.

[Presurgical nasoalveolar molding in the treatment of infants with bilateral complete cleft lip and palate].

Purpose: To evaluate the curative effect of presurgical nasoalveolar molding (NAM) in the treatment of infants with bilateral complete cleft lip and palate (BCLP).

Methods: Nine infants with BCLP were included. Presurgical alveolar molding was used to bring the premaxilla back into proper alignment with the lateral segments in the maxilla arch.

Sagittal maxillary growth in patients with unoperated isolated cleft palate.

Objective: To examine the sagittal maxillary growth during mixed and permanent dentition in patients with unoperated isolated cleft palate.

Patients: A total of 41 patients with nonsyndromic unoperated isolated cleft palate, 16 with mixed dentition and 25 with permanent dentition.

Main Outcome Measures: Cephalograms were analyzed to compare these patients with those with isolated cleft palate who had been repaired operatively as well with normal individuals.

[Bolton tooth-size discrepancy among different skeletal malocclusion groups].

Purpose: To evaluate the differences in tooth size ratios and distributions of Bolton anterior and overall ratios among different skeletal malocclusions.

Methods: 180 subjects were involved in this study, each malocclusion group consisted of 60 subjects(30 males and 30 females). The mesio-distal width from left first molar to right first molar was measured, Bolton anterior and overall ratios were calculated.

[Sagital position of glenoid fossa in Angle Class II malocclusion with mandibular retrusion].

Purpose: To evaluate and compare the morphology and position of the glenoid fossa in patients with Class II malocclusion associated with mandibular retrusion and Class I malocclusion in the permanent dentition.

Methods: A sample of 26 subjects(12 males, 14 females, average age 13.4 years) with skeletal and dental Class II malocclusion associated with mandibular retrusion, was compared with a matched group of 31 subjects(12 males, 19 females, aged 12.

[The development and clinical applications of aesthetic brackets].

Due to the significantly increasing demand of aesthetics during orthodontic treatments, aesthetic brackets have gained popularity in clinic. In general, the current aesthetic brackets are either ceramic brackets or plastic brackets. This article provided a review of the latest information about the aesthetic brackets' materials, designs, and their clinical applications.

[Evaluation of bone volume of alveolar cleft before and after bone graft].

Objective: The aim of this study was to evaluate the changing of alveolar cleft bone volume before and after bone graft.

Methods: 11 complete unilateral alveolar cleft patients were scanned with dental CT before bone graft surgery and 3 months after surgery. Matlab7.

The effects of a newly designed twin-slot bracket on severely malpositioned teeth--a typodont experimental study.

The aims of this study were to design a twin-slot bracket featuring two horizontal slots and to examine its efficiency in tooth displacement. Based on the structure of a traditional edgewise bracket, an additional slot was added to a twin-slot bracket and the prototype products were fabricated for the typodont experiments. The orthodontic correction of malpositioned canines was conducted on a typodont to examine the efficiency of the twin-slot bracket in tooth displacement compared with a single-slot edgewise bracket.

[A comparison of rapid palatal expansion and Damon appliance on non-extraction correction of dental crowding].

Purpose: To compare the effect of rapid palatal expansion (RPE) and Damon technique on the correction of dental crowding with non-extraction approach.

Methods: 19 adolescent patients with non-extraction orthodontic treatment were reviewed. They had Class I skeletal pattern and moderate crowding.

[Dental arch form reverting by four-point method].

Purpose: To explore a simple method of reverting individual dental arch form template for wire bending.

Methods: Individual dental arch form was reverted by four-point method. By defining central point of bracket on bilateral lower second premolar and first molar, certain individual dental arch form could be generated.

Mandibular functional positioning only in vertical dimension contributes to condylar adaptation evidenced by concomitant expressions of L-Sox5 and type II collagen.

Objective: Concerted expressions of L-Sox5 and type II collagen play an important part in osteogenic transition in epiphyseal cartilage. This study was designed to elucidate the role of mandibular vertical functional positioning in condylar adaptive remodelling by examining L-Sox5 and type II collagen expressions in condylar cartilage.

Design: 40 female Sprague-Dawley rats at age of 5 weeks were randomly divided into the experimental (n=20) and control groups (n=20).

[The clinical implication of self-ligating brackets].

The self-ligating bracket is a new kind of bracket. The cardinal feature of a self-ligating bracket is an inbuilt metal labial face to the bracket slot, which is referred to as a clip or slide. It reduces the chairside time and makes the ligating easier.