[Transverse characteristics of normodivergent patients in different sagittal skeletal patterns].

Purpose: This study aimed to measure and analyze the transverse indicators of normodivergent patients with different sagittal skeletal malocclusions, to explore the transverse characteristics of different sagittal skeletal malocclusions.

Methods: Lateral cephalograms and CBCT of 90 normodivergent patients with skeletal Class Ⅰ, Ⅱ and Ⅲ in their permanent dentition were collected. Dolphin software was applied to measure the widths of the basal bone, alveolar bone, dental arch and buccolingual inclination angle of the corresponding teeth in the maxillary and mandibular canine, premolar and molar areas.

[A comparative study of tongue appliance combined with chin-cup and facemask in the treatment of anterior crossbite].

Purpose: To compare the efficacy of tongue appliance combined with chin-cup and facemask in the treatment of anterior crossbite, as well as the effects on the position of hyoid bone and airway, so as to provide reference for clinic.

Methods: Sixty cases with anterior crossbite were selected after treatment, using tongue appliance combined with chin-cup (n=30) and facemask (n=30). Cephalometric radiographs were taken before and after treatment, skeletal, dental, hyoid, and airway space measurements were analyzed with Winceph 9.

China experts' consensus on preventive and interceptive orthodontic treatments of malocclusions of children.

Malocclusion is one of the three most common oral diseases reported by World Health Organization(WHO). In China, its incidence rate is rising. Malocclusion seriously affects the dental and maxillofacial function, facial appearance and growth development of nearly 260 million children in China, and what is more, it affects their physical and mental health development.

[Effect of premolars scissor bite on the sagittal position of mandible].

Purpose: To study the effect of adolescent premolar scissor bite on the sagittal position of mandible and provide proper reference for correct orthodontic diagnosis and right time to treatment. METHODS： One hundred adolescents (54 females, 46 males) with scissor bite of premolars(70 were unilateral,30 were bilateral) were selected as experimental group between 2004 to 2017 from the Department of Orthodontics, Stomatological Hospital of China Medical University. Among them, 54 females served as female group, 46 males served as male group; 30 were bilateral and 70 were unilateral.

[Cephalometric study of tongue crib combined with chincup treatment for anterior crossbite].

Purpose: To evaluate the effect of anterior crossbite patients with bad tongue habit treated by tongue crib combined with chincup by cephalometric analysis.

Methods: A total of 25 patients (8 males, 17 females, age range 7-13 years, average age 8.6 years) of anterior crossbite with bad tongue habit or incorrect tongue position were selected.

Alveolar bone thickness around maxillary central incisors of different inclination assessed with cone-beam computed tomography.

Objective: To assess the labial and lingual alveolar bone thickness in adults with maxillary central incisors of different inclination by cone-beam computed tomography (CBCT).

Methods: Ninety maxillary central incisors from 45 patients were divided into three groups based on the maxillary central incisors to palatal plane angle; lingual-inclined, normal, and labial-inclined. Reformatted CBCT images were used to measure the labial and lingual alveolar bone thickness (ABT) at intervals corresponding to every 1/10 of the root length.

[The relationship between labial-lingual inclination and the thickness of the alveolar bone in the mandibular central incisors assessed with cone-beam computed tomography].

Purpose: To investigate the alveolar bone thickness of mandibular central incisors with different labial-lingual inclinations by cone-beam computed tomography (CBCT).

Methods: CBCT and lateral cephalometric images of 60 patients were chosen. The data was respectively classified into 3 groups by L1-MP: lingual inclination group (L1-MP<85.

[The relationship between maxillary anterior impacted teeth and sagittal facial type].

Purpose: To investigate the relationship between impaction of maxillary anterior teeth and sagittal facial type and evaluate the dentofacial morphological characteristics of patients with maxillary teeth impaction.

Methods: Totally 90 patients with maxillary anterior teeth impaction were divided into 3 groups (one incisor impaction, one canine impaction and two canines impaction), and their cephalometric films were measured and analyzed. They were further divided into Class I, II and III facial types according to ANB and the constituent ratio were calculated.

[Root resorption after orthodontic treatment: a study of age factor and prevalence in anterior teeth].

Purpose: To investigate the impact of age factor on root resorption and the prevalence in anterior teeth during orthodontic treatment.

Methods: Sixty extraction cases treated with straight wire appliance were divided into adult group and child group, with 30 cases in each group.The panoramic radiographs pre-treatment and post-treatment were examined to measure the degrees of root resorption.

[First molar extraction in malocclusion: an analysis of 20 consecutive cases].

Purpose: To study the feasibility and orthodontic effect of decayed first molar extraction in malocclusion.

Methods: 20 cases with first molar extraction in malocclusion were chosen for this study. There were 3 males and 17 females, aging from 13.

[Changes of interlukin-1beta and tumor necrosis factor-alpha levels in gingival crevicular fluid during orthodontic tooth movement].

Objective: To investigate the dynamic changes of interlukin-1beta (IL-1beta) and tumor necrosis factor-alpha (TNF-alpha) in gingival crevicular fluid (GCF) during orthodontic tooth movement, and to discuss the biological significance.

Methods: Fifteen patients were chosen as subjects. For each patient, upper and lower canines at one side having one treatment for distal movement by elastic chain served as the experimental teeth, whereas the contralateral ones were used as controls.

[Ectopic expression of cyclin G2 inhibits cell proliferation in HeLa cancer cell line].

Background & Objective: Cyclins are important proteins in cell cycle machinery, acting as positive regulators in cell proliferation. Cyclin G2 may exceptionally be a negative regulator since its expression could be induced by DNA damage and the VHL tumor suppressor protein. Furthermore, down-regulated cyclin G2 was detected in oral squamous cell carcinomas.