[Properties of NiTi wires with direct electric resistance heat treatment method in three-point bending tests].

Objective: To investigate the mechanical properties of Ni-Ti wires with direct electric resistance heat treatment (DERHT) method in three-point bending tests.

Methods: Two superelastic Ni-Ti wires (wire A: Smart SE, wire B: SENTALLOY SE, 0.406 mm × 0.

[Relationship between condyle movement and disc position in patients with Class II division 1 malocclusion].

Objective: To investigate the relationship between condyle movement and temporomandibular disorders (TMD) in patients with Class II division 1 malocclusion.

Methods: Twenty patients (from 11 to 12 years old) with Class II division 1 malocclusion before treatment were collected. Computer aided diagnosis axiograph (CADIAX) and magnetic resonance images (MRI) were used to analyze the condyle movement between disc displacement and normal groups.

[Occlusal contacts in intercuspal position after orthodontic treatment].

Objective: To observe the occlusal contacts in intercuspal position(ICP) in adolescent patients after orthodontic treatment.

Methods: Fourteen adolescent patients after orthodontic treatment were selected as experimental group and 17 healthy adolescents and young adults with normal occlusion were selected as control group. The occlusal contact in ICP in the two groups were recorded with T-Scan II system and compared.

[Patients with anterior spaces caused by periodontal disease treated with aligner technique].

Objective: To treat the patients with anterior spaces caused by periodontal diseases with aligners and evaluate the periodontal conditions before and after treatment.

Methods: Seven patients with anterior spaces ranged from 3.0 to 4.

Biomechanical and histomorphometric characterizations of osseointegration during mini-screw healing in rabbit tibiae.

Objective: To evaluate effects of different healing times on integration of titanium mini-screws and bones under unloaded conditions.

Materials And Methods: Biomechanical stability measurements and histomorphometric observations were performed in a rabbit tibia model after different healing times: 0 (immediate) and 1, 2, 4, and 8 weeks.

Results: Biomechanical stability and both maximum torque and maximum pullout load increased with healing time but increased significantly only after 4 weeks.

[Preliminary clinical application of Chinese-made invisible orthodontic technique].

Objective: To treat simple malocclusions preliminarily using Chinese-made invisible orthodontic aligners and discuss the indications, problems existed and future development.

Methods: Forty-one cases with different malocclusions were selected, including crowding, spaces and spaces due to periodontal problems. Invisible aligners were made and worn by patients and they were changed every 2 - 3 weeks.

[Relationships between MRI image changes of lateral pterygoid muscle, disc position and condylar mobility in Class II patients].

Objective: To analyze the relationships between MRI image changes of lateral pterygoid muscle (LPM), disc position and condylar mobility.

Methods: Twenty Class II patients were chosen and MRI images of LPM were taken. The relationships between MRI image changes of LPM, disc position and condylar mobility were analyzed.

[Opportunities and challenges during the development of the orthodontic invisible aligner technique].

The bracketless invisible aligner technique has been considered as a new developed orthodontic technique since its appearance during the period of late 1990s. It is characterized with the advantages of more aesthetic, comfortable, simple, high-efficient and predictable compared with current traditional orthodontic techniques depending on brackets and wires for orthodontic tooth movements. There have been many opportunities for further development and clinical application for the technique with the developments of material sciences, computer software and hardware technology, rapid prototyping techniques, et al.

[Condyle movement in class II division 1 malocclusion patients after functional appliance treatment].

Objective: To record and analyze the characteristics of condyle movement before and after functional treatment in Angle class II division 1 malocclusion (II(1)) patients.

Methods: Twenty Angle II(1) patients were included in the study and 20 Angle I patients without temporomandibular disorders symptoms served as controls. Computer aided diagnosis axiograph (CADIAX) was used to record the condyle movement in Angle II(1) patients and that caused by functional appliance treatment during mouth opening and closing.

[Stability of the miniscrew implant during healing period].

Objective: To evaluate the stability of mini-screw implant during different healing periods in the unloaded conditions.

Methods: Sixty titanium mini-screws were used in this study. A total of 10 New Zealand white rabbits were randomly divided into 5 groups according to different healing periods.

[Single nucleotide polymorphisms of growth hormone receptor gene in Chinese Han ethnic population].

Objective: To analyze the distribution of single nucleotide polymorphisms (SNP) of growth hormone receptor (GHR) gene in Chinese Han ethnic population.

Methods: The sample of 106 unrelated healthy Chinese Hans was studied by sequencing exons of the GHR gene to detect SNP.

Results: There were 6 SNP spots identified in exon 6 and exon 10.