Three-D imaging of dental alveolar bone change after fixed orthodontic treatment in patients with periodontitis.

Objectives: The objective of this study was to radiographically quantify bone height and bone density in patients with periodontitis after fixed orthodontic treatment using cone beam computed tomography (CBCT).

Materials And Methods: A total of 81 patients including 40 patients with chronic periodontitis (group 1) and 41 patients with normal periodontal tissues (group 2) were selected. CBCT scanning for anterior teeth were taken before and after orthodontic treatment.

[Inter-relationship between mandibular rotation center and maxillary Le Fort I impaction osteotomies].

Purpose: The purpose of the present investigation was to locate the instantaneous rotation center of the mandible during maxillary surgical impaction, and explore the relationship between automatic rotation center of the mandible and maxillary elevation amount, the length of the mandible and mandibular plane angle.

Methods: Twenty-five patients who underwent maxillary Le Fort I impaction without concomitant major mandibular ramus split osteotomies were included. The preoperative and postoperative lateral cephalograms were used to evaluate the surgical changes and locate the mandibular autorotation center with Reuleaux method.

[Research on periodontal changes on the compression side during rapid tooth movement into newly distracted bone].

Purpose: To investigate periodontal remodeling mechanism on the compression side during early tooth movement into newly distracted bone.

Methods: Ten male Beagle dogs were selected. Distraction osteogenesis was performed on randomized side as experimental group, while the fourth premolars were extracted on the other side as control group.

Mia-assisted orthodontic treatment for dental malocclusion secondary to periodontal disease.

In contemporary dental care, an increasing number of adult patients with periodontal disease are seeking orthodontic treatment. Achieving optimal results in such adult patients is difficult because decreased posterior tooth anchorage is risky. This case report demonstrates the use of miniscrew implant anchorage (MIA) in a Chinese male 21 years 5 months of age with maxillary and mandibular anterior dental spacing, bimaxillary protrusion, and severe bone loss caused by periodontal disease.

[Cephalometric analysis of implant anchorage-assisted retraction of anterior teeth].

Purpose: The purpose of this study is to compare the different effects of alveolar bone remolding due to retraction of anterior teeth by two types of anchorage mini-screw implant or regular maximum anchorage.

Methods: The sample comprised 26 orthodontic patients with upper dental alveolar bone protrusion and mild crowding. The treatment plan was to remove the four first bicuspids.

[Clinical evaluation of implant anchorage for molar intrusion: report of the short-term results].

Purpose: The purpose of this study is to evaluate the efficiency and security of self-drilling mini-screw implant anchorage for molar intrusion, to achieve the right position of the mini-screw implant.

Methods: Ten patients with overerupted maxillary molars were selected, aging from 25 to 53 years old, the average age was 33 years old. There were 2 men and 8 women.

[Current gene study in etiological analysis of congenital craniofacial abnormalities].

The cause of congenital craniofacial abnormalities are very complicated. Understanding of the gene mechanisms of abnormalities taking place are very important for prevention and therapy.DNA sequence analysis provides the fundaments of gene study of the congenital craniofacial abnormalities.