Combining virtual model and cone beam computed tomography to assess periodontal changes after anterior tooth movement

• मुख्य लेखकों: Sun-Hyun Kim (लेखक), Jong-Bin Lee (लेखक), Min-Ji Kim (लेखक), Eun-Kyoung Pang (लेखक)
• स्वरूप: पुस्तक
• प्रकाशित: BMC, 2018-11-01T00:00:00Z.
• विषय: article
• ऑनलाइन पहुंच: Connect to this object online.
• Notes: 10.1186/s12903-018-0635-y; 1472-6831
• Keywords: CBCT; Virtual model; Gingival thickness; Alveolar bone thickness; Dentistry; RK1-715
• Source: BMC Oral Health, Vol 18, Iss 1, Pp 1-8 (2018)

Abstract Background Orthodontic force may affect not only periodontal ligaments, but also the alveoloar bone and the gingiva according to the type of tooth movements. The authors assessed changes in gingival thickness (GT) and alveolar bone thickness (ABT) after orthodontic treatment using a new method. Methods This study included 408 teeth (208 central incisors, 200 lateral incisors) from the upper and lower 4 anterior teeth of 52 patients who had completed orthodontic treatment. GT and ABT were measured using virtual casts fabricated from impressions and cone beam computed tomography (CBCT). Two sectioned images of every tooth axis were acquired by partitioning each tooth with a line connecting the midpoint of the incisal edge to the midpoint of the cementoenamel junction in the virtual models and the root apex in CBCT images. After superimposing the two sectioned images, GT and ABT were measured before and after orthodontic tooth movement. Correlations between GT and ABT before and after treatment, and changes in GT and ABT associated with sex, tooth arch, tooth position, orthognathic surgery, and tooth inclination and rotation were assessed. Results Before orthodontic treatment, GT and ABT were significantly correlated. Patients who underwent orthognathic surgery exhibited an increase in GT thickness compared with those who did not. ABT was significantly decreased in proclined teeth and in rotated teeth. Conclusions GT and ABT can be affected by the nature of tooth movement and can be accurately assessed by comparing sectioned CBCT images and virtual models.