A cone beam computed tomography study based on three-dimensional cephalometric analysis of relationships between the lip-line and jaw deformity. (September 2022)

• Record Type: Journal Article
• Authors: Teng, Caitian; Zhu, Junwei; Wang, Huifang; Yu, Qing
• Is Part Of: Archives of oral biology. Volume 141(2022)
• Publication Date: 2022-09
• Subjects: CBCT Cone beam computed tomography -- Mimics Materialise Interactive Medical Image Control System -- MSP (Midsagittal plane) Connection between center of sella twcica, nasion and anterior nasal spine -- LLC (Lip-line cant) Angle between the Frankfort horizontal plane and the left lip-line -- LL (Lip-line)Line connecting the bilateral outermost point of the lip contour -- OP (Occlusal plane) Line between the occlusal midpoints of the first permanent molars and the occlusal midpoint of the maxillary and mandibular central incisors -- CP Coronal position -- FH (Frankfort horizontal plane) Horizontal plane running through the bilateral orbital and ear points -- DICOM Digital Imaging and Communications in Medicine -- S (Center of sella twcica) Center of pituitary fossa of sphenoid bone -- N (Nasion) Suture between the frontal and nasal bones -- ANS (Anterior nasal spine) Tip of median anterior bony process of maxilla -- P (Porion) Most superior point of external auditory meatus -- O (Orbitale) Most inferior point of lower margin of orbit -- Go Posterior inferior point of the mandibular angle -- U1 Adjacent midpoint of maxillary central incisor -- L1 Adjacent midpoint of mandibular central incisor -- Po (Pogonion)Most forward protruding point on the front surface of the chin -- Gn (Gnathion) Most inferior point of the mandible, A point on the chin determined by bisecting the angle formed by the facial and mandibular planes -- Me (Menton) Most inferior point of symphysis of mandible -- L The commissure of upper and lower lip, The bilateral outermost point of the lip contour -- MP (Mandibular plane) Line between mandible angle and mental apex of chin -- FH-MSP Angle between the FH and the MSP (Coronal position) -- OP-MSP Angle between the OP and the MSP (Coronal position) -- MP-MSP Angle between the MP and the MSP (Coronal position) -- LL-MSP Angle between the LL and the MSP (Coronal position) -- FH-OP CP Angle between the FH and the left OP (Coronal position), the occlusal plane cant -- FH-MP CP Angle between the FH and the left MP (Coronal position), the mandibular plane cant -- FH-LL CP Angle between the FH and the left LL (Coronal position), the lip-line cant -- PD (Pogonion deviation) Distance from Po to the MSP(Coronal position) -- GD (Gnathion deviation) Distance from Gn to the MSP(Coronal position) -- MD (Menton deviation) Distance from Me to the MSP(Coronal position), Deviation between Me and MSP -- ULD Distance between the midlines of the maxillary and mandibular central incisors: Distance between two lines parallel to the midpoint of the upper and lower central incisors parallel to the MSP (Coronal position) -- SPSS Statistical Package for Social Sciences; Cone beam computed tomography -- Jaw deformity -- Lip-line cant -- Menton deviation -- Occlusal plane cant; Mouth -- Periodicals; Mouth -- Diseases -- Periodicals; Dentistry -- Periodicals; Electronic journals; 617.6005
• DOI: 10.1016/j.archoralbio.2022.105489
• Languages: English
• ISSNs: 0003-9969

Abstract

Abstract: Objective: The aim of this study was to use the cone beam computed tomography (CBCT) to study the relationships between the lip-line and mandible deformity. Design: CBCT data of 20 patients with jaw deformity (experimental group) and 20 patients without mandible deformity (control group) were selected. Use three-dimensional cephalometry to measure the reconstructed images of CBCT data simulated by the Materialise Interactive Medical Image Control System (Mimics), mark the related points, lines and planes of the three-dimensional craniomaxillofacial structure, and measure relevant distances and angles. The T-test, Pearson correlation analysis and Linear regression were used to analyze the characteristics of the lip-line and jaw deformity. Results: There was a significant difference in the lip-line between mandible deformity group and control group. Significant positive correlations could been found among the lip-line cant, the occlusal plane cant, the mandibular plane cant and the degree of mandible deformity (r=0.964, 0.942, 0.611, P < 0.01). A linear relationship was found between the left lip-line cant Y and the menton deviation X [the mandible deflection to the right was defined as positive, and the left lip-line below frankfort horizontal was viewed as positive] as Y= 0.340 + 0.505X. Conclusions: The lip-line of patients with jaw deformity was inclined, and the lip-line cant was positively correlated with the degree of mandible deformity, and there was a certain linear relationship between the two, which could provide a theoretical reference for clinicians to diagnose and treat patients with mandible deformity. Highlights: We analysed relationships between the lip-line and jaw deformities. We used 3D cephalometric analysis of the lip-line and mandible deformity. There was a relatively consistent trend of the lip-line and occlusal plane cants. There was a linear relationship between the lip-line cant and mandible deviation.