Korean Journal of Orthodontics最新文献

{"title":"Micro-computed tomography evaluation of the effects of orthodontic force on immature maxillary first molars and alveolar bone mineral density of Sprague-Dawley rats.","authors":"Jingwei Wang,&nbsp;Ruofang Zhang,&nbsp;Zhuoying Zhang,&nbsp;Chao Geng,&nbsp;Yanpeng Zhang","doi":"10.4041/kjod22.209","DOIUrl":"https://doi.org/10.4041/kjod22.209","url":null,"abstract":"<p><strong>Objective: </strong>To investigate changes in the immature teeth of Sprague-Dawley rats during orthodontic treatment and to explore the changes in the peri-radicular alveolar bone through micro-computed tomography (CT).</p><p><strong>Methods: </strong>Twenty-five 26-day-old male Sprague-Dawley rats were included. The maxillary left first molar was moved mesially under a continuous force of 30 cN, and the right first molar served as the control. After orthodontic treatment for 7, 14, 21, 28, and 42 days, the root length, tooth volume, and alveolar bone mineral density (BMD) around the mesial root were measured through micro-CT.</p><p><strong>Results: </strong>The immature teeth continued to elongate after application of orthodontic force. The root length on the force side was significantly smaller than that on the control side, whereas the differences in the volume change between both sides were not statistically significant. Alveolar bone in the coronal part of the compression and tension sides showed no difference in BMD between the experimental and control groups. The BMD of the experimental group decreased from day 14 to day 42 in the apical part of the compression side and increased from day 7 to day 42 in the apical part of the tension side. The BMD of the experimental group decreased in the root apex part on day 7.</p><p><strong>Conclusions: </strong>The root length and volume of immature teeth showed continued development under orthodontic forces. Alveolar bone resorption was observed on the compression side, and bone formation was observed on the tension side.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 3","pages":"205-216"},"PeriodicalIF":1.9,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/0a/c0/kjod-53-3-205.PMC10212771.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9880013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of changes in the nasal cavity, pharyngeal airway, and maxillary sinus volumes after expansion and maxillary protraction with two protocols: Rapid palatal expansion versus alternate rapid maxillary expansion and constriction.","authors":"Weitao Liu,&nbsp;Shaonan Zhou,&nbsp;Edwin Yen,&nbsp;Bingshuang Zou","doi":"10.4041/kjod22.075","DOIUrl":"https://doi.org/10.4041/kjod22.075","url":null,"abstract":"<p><strong>Objective: </strong>To evaluate and compare a series of volume changes in the nasal cavity (NC), nasopharynx, oropharynx, and maxillary sinuses (MS) in growing Class III patients after either rapid palatal expansion (RPE) or alternate rapid maxillary expansion and constriction (Alt-RAMEC) followed by facemask (FM) therapy, by using conebeam computed tomography (CBCT).</p><p><strong>Methods: </strong>Forty growing Class III patients were retrospectively selected and divided into two matched groups: RPE/FM (14 females, 6 males; mean age, 9.66 ± 1.23 years) and Alt-RAMEC/FM groups (14 females, 6 males; mean age, 10.28 ± 1.45 years). The anteroposterior and vertical displacements of Point A, the volumes of the NC, nasopharyngeal, oropharyngeal, and MS were measured at different time points: pretreatment (T1), postexpansion (T2), and postprotraction (T3).</p><p><strong>Results: </strong>Both groups demonstrated significant maxilla advancement (by 1.3 mm) during expansion, with a statistically significant intergroup difference during protraction (RPE/FM, 1.1 mm; Alt-RAMEC/FM, 2.4 mm; <i>p</i> < 0.05) and throughout the treatment (RPE/FM, 2.4 mm; Alt-RAMEC/FM, 3.7 mm; <i>p</i> < 0.05). NC and nasopharyngeal airway volumes increased significantly in both groups after expansion, protraction, and treatment. The oropharyngeal and MS volumes increased in both groups after protraction and post-treatment. However, no volumetric differences were observed between the two groups.</p><p><strong>Conclusions: </strong>There was no significant difference in airway volume changes, including NC, nasopharyngeal, oropharyngeal airway, and MS, between RPE/FM and Alt-RAMEC/FM groups at different time points. Although there was significantly more forward movement after protraction in the Alt-RAMEC/FM group, the difference was deemed too small to be clinically relevant.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 3","pages":"175-184"},"PeriodicalIF":1.9,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/2c/8d/kjod-53-3-175.PMC10212776.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9525959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Association between the severity of hypodontia and the characteristics of craniofacial morphology in a Chinese population: A cross-sectional study.","authors":"Xin Xiong,&nbsp;Jiaqi Liu,&nbsp;Yange Wu,&nbsp;Chengxinyue Ye,&nbsp;Qinlanhui Zhang,&nbsp;Yufan Zhu,&nbsp;Wenke Yang,&nbsp;Jun Wang","doi":"10.4041/kjod22.073","DOIUrl":"https://doi.org/10.4041/kjod22.073","url":null,"abstract":"<p><strong>Objective: </strong>To investigate craniofacial differences in individuals with hypodontia and explore the relationship between craniofacial features and the number of congenitally missing teeth.</p><p><strong>Methods: </strong>A cross-sectional study was conducted among 261 Chinese patients (males, 124; females, 137; age, 7-24 years), divided into four groups (without hypodontia: no teeth missing, mild: one or two missing teeth, moderate: three to five missing teeth, severe: six or more missing teeth) according to the number of congenitally missing teeth. Differences in cephalometric measurements among the groups were analyzed. Further, multivariate linear regression and smooth curve fitting were performed to evaluate the relationship between the number of congenitally missing teeth and the cephalometric measurements.</p><p><strong>Results: </strong>In patients with hypodontia, SNA, NA-AP, FH-NA, ANB, Wits, ANS-Me/N-Me, GoGn-SN, UL-EP, and LL-EP significantly decreased, while Pog-NB, AB-NP, N-ANS, and S-Go/N-Me significantly increased. In multivariate linear regression analysis, SNB, Pog-NB, and S-Go/N-Me were positively related to the number of congenitally missing teeth. In contrast, NA-AP, FH-NA, ANB, Wits, N-Me, ANS-Me, ANS-Me/N-Me, GoGn-SN, SGn-FH (Y-axis), UL-EP, and LL-EP were negatively related, with absolute values of regression coefficients ranging from 0.147 to 0.357. Further, NA-AP, Pog-NB, S-Go/N-Me, and GoGn-SN showed the same tendency in both sexes, whereas UL-EP and LL-EP were different.</p><p><strong>Conclusions: </strong>Compared with controls, patients with hypodontia tend toward a Class III skeletal relationship, reduced lower anterior face height, flatter mandibular plane, and more retrusive lips. The number of congenitally missing teeth had a greater effect on certain characteristics of craniofacial morphology in males than in females.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 3","pages":"150-162"},"PeriodicalIF":1.9,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/e2/55/kjod-53-3-150.PMC10212772.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9529761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Covariance patterns between ramus morphology and the rest of the face: A geometric morphometric study.","authors":"Marietta Krüsi,&nbsp;Demetrios J Halazonetis,&nbsp;Theodore Eliades,&nbsp;Vasiliki Koretsi","doi":"10.4041/kjod22.208","DOIUrl":"https://doi.org/10.4041/kjod22.208","url":null,"abstract":"<p><strong>Objective: </strong>The growth and development of the mandible strongly depend on modeling changes occurring at its ramus. Here, we investigated covariance patterns between the morphology of the ramus and the rest of the face.</p><p><strong>Methods: </strong>Lateral cephalograms of 159 adults (55 males and 104 females) with no history of orthodontic treatment were collected. Geometric morphometrics with sliding semi-landmarks was used. The covariance between the ramus and face was investigated using a two-block partial least squares analysis (PLS). Sexual dimorphism and allometry were also assessed.</p><p><strong>Results: </strong>Differences in the divergence of the face and anteroposterior relationship of the jaws accounted for 24.1% and 21.6% of shape variation in the sample, respectively. Shape variation was greater in the sagittal plane for males than for females (30.7% vs. 17.4%), whereas variation in the vertical plane was similar for both sexes (23.7% for males and 25.4% for females). Size-related allometric differences between the sexes accounted for the shape variation to a maximum of 6% regarding the face. Regarding the covariation between the shapes of the ramus and the rest of the face, wider and shorter rami were associated with a decreased lower anterior facial height as well as a prognathic mandible and maxilla (PLS 1, 45.5% of the covariance). Additionally, a more posteriorly inclined ramus in the lower region was correlated with a Class II pattern and flat mandibular plane.</p><p><strong>Conclusions: </strong>The width, height, and inclination of the ramus were correlated with facial shape changes in the vertical and sagittal planes.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 3","pages":"185-193"},"PeriodicalIF":1.9,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/c0/aa/kjod-53-3-185.PMC10212770.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9525951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Artificial neural network model for predicting sex using dental and orthodontic measurements.","authors":"Sandra Anic-Milosevic,&nbsp;Natasa Medancic,&nbsp;Martina Calusic-Sarac,&nbsp;Jelena Dumancic,&nbsp;Hrvoje Brkic","doi":"10.4041/kjod22.250","DOIUrl":"https://doi.org/10.4041/kjod22.250","url":null,"abstract":"<p><strong>Objective: </strong>To investigate sex-specific correlations between the dimensions of permanent canines and the anterior Bolton ratio and to construct a statistical model capable of identifying the sex of an unknown subject.</p><p><strong>Methods: </strong>Odontometric data were collected from 121 plaster study models derived from Caucasian orthodontic patients aged 12-17 years at the pretreatment stage by measuring the dimensions of the permanent canines and Bolton's anterior ratio. Sixteen variables were collected for each subject: 12 dimensions of the permanent canines, sex, age, anterior Bolton ratio, and Angle's classification. Data were analyzed using inferential statistics, principal component analysis, and artificial neural network modeling.</p><p><strong>Results: </strong>Sex-specific differences were identified in all odontometric variables, and an artificial neural network model was prepared that used odontometric variables for predicting the sex of the participants with an accuracy of > 80%. This model can be applied for forensic purposes, and its accuracy can be further improved by adding data collected from new subjects or adding new variables for existing subjects. The improvement in the accuracy of the model was demonstrated by an increase in the percentage of accurate predictions from 72.0-78.1% to 77.8-85.7% after the anterior Bolton ratio and age were added.</p><p><strong>Conclusions: </strong>The described artificial neural network model combines forensic dentistry and orthodontics to improve subject recognition by expanding the initial space of odontometric variables and adding orthodontic parameters.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 3","pages":"194-204"},"PeriodicalIF":1.9,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/84/22/kjod-53-3-194.PMC10212777.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9880012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Perception of discrepancy in the upper midline position in conjunction with the gingival display according to various occupations in Iran.","authors":"Hooman Zarif Najafi,&nbsp;Taraneh Estedlal,&nbsp;Maryam Saki,&nbsp;Maryam Azadi","doi":"10.4041/kjod22.164","DOIUrl":"https://doi.org/10.4041/kjod22.164","url":null,"abstract":"<p><strong>Objective: </strong>This study evaluated the influence of various gingival displays on the esthetic perception in the presence of upper dental midline discrepancy.</p><p><strong>Methods: </strong>A smiling image of a male subject was altered digitally to produce five image series: normal smile (series A), decreased tooth show (series B), increased gingival show (series C), maxillary cant (series D), and asymmetric upper lip elevation (series E). In each image series, the midline was deviated to the right and left incrementally. A total of 210 raters (four professional groups and laypersons, n = 42 in each group) determined the midline deviation threshold and the attractiveness of midline position in each series.</p><p><strong>Results: </strong>The right and left thresholds were statistically similar for the symmetrical series (A, B, and C), while for series D, the right threshold was significantly lower. In most rater groups, the mean threshold order was: B > A > E > C > D. In all the series, the raters selected the coincident midline as the most attractive series except for series D, for which 1-2-mm deviations to the left were selected as the most attractive by almost all the groups.</p><p><strong>Conclusions: </strong>It is crucial to establish the coincident midline position in a symmetrical smile, especially when a gummy smile exists. In the asymmetrical gingival show, a coincident midline might not be the most esthetic midline position.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 3","pages":"163-174"},"PeriodicalIF":1.9,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/f4/f7/kjod-53-3-163.PMC10212775.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9895933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clinical predictors of potentially impacted canines in low-risk patients: A retrospective study in mixed dentition.","authors":"Sergio Estelita Barros,&nbsp;Bianca Heck,&nbsp;Kelly Chiqueto,&nbsp;Eduardo Ferreira","doi":"10.4041/kjod22.179","DOIUrl":"https://doi.org/10.4041/kjod22.179","url":null,"abstract":"<p><strong>Objective: </strong>To evaluate the null hypothesis that there is no difference in a set of clinical predictors of potentially impacted canines between low-risk patients with and without displaced canines.</p><p><strong>Methods: </strong>The normal canine position group consisted of 30 patients with 60 normally erupting canines ranked in sector I (age, 9.30 ± 0.94 years). The displaced canine group comprised 30 patients with 41 potentially impacted canines ranked in sectors II to IV (age, 9.46 ± 0.78 years). Maxillary lateral incisor crown angulation, inclination, rotation, width, height, and shape, as well as palatal depth, arch length, width, and perimeter composed a set of clinical predictors, which were evaluated on digital dental casts. Statistical analyses consisted of group comparisons and variable correlations (<i>p</i> < 0.05).</p><p><strong>Results: </strong>There was a significant association between sex and mesially displaced canines. Unilateral canine displacement was more prevalent than bilateral displacement. The crown of the maxillary lateral incisors was significantly angulated more mesially and rotated mesiolabially in low-risk patients with displaced canines, who also had a shallower palate and shorter anterior dental arch length. Lateral incisor crown angulation and rotation, as well as palatal depth and arch length, were significantly correlated with the canine displacement severity.</p><p><strong>Conclusions: </strong>The null hypothesis was rejected. Maxillary lateral incisor angulation inconsistent with the \"ugly duckling\" stage as well as a shallow palate and short arch length are clinical predictors that can significantly contribute to the early screening of ectopic canines in low-risk patients.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 2","pages":"106-115"},"PeriodicalIF":1.9,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/b6/3a/kjod-53-2-106.PMC10040294.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9192079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and validation of a novel screening instrument to prioritize the orthodontic referral of developing malocclusion in children: The index for interceptive orthodontics referral.","authors":"Saraswathy Devi Sinniah,&nbsp;Annapurny Venkiteswaran,&nbsp;Najiyatu Nazihah Zakaria","doi":"10.4041/kjod22.229","DOIUrl":"https://doi.org/10.4041/kjod22.229","url":null,"abstract":"<p><strong>Objective: </strong>The absence of a guideline to refer to developing malocclusions appropriately, may be a contributing factor to the inadequacy of timely interceptive orthodontics provision. This study aimed to develop and validate a new orthodontic grading and referral index to be used by dental frontliners to prioritize the orthodontic referral of developing malocclusion in children based on its severity.</p><p><strong>Methods: </strong>A cross-sectional study involving clinical assessment with 413 schoolchildren aged between 8.1 and 11.9 years was conducted in 2018. All the presenting malocclusion was listed and graded based on a few dental guidelines to produce the draft index. The validity and reliability of the draft index were tested using twenty study models. Face and content validation was carried out using the content validation index and Modified Kappa Statistics.</p><p><strong>Results: </strong>Fourteen dental and occlusal anomalies were identified as components of malocclusion and three grades of referral (monitor, standard, urgent) were included in the final index. The scale-level content validity index average value of 0.86 and 0.87 was obtained for content and face validation, respectively. There was moderate to excellent agreement in the Modified Kappa Statistics for both validations. Excellent inter- and intra-assessor agreement was obtained. The new index displayed valid and reliable scores.</p><p><strong>Conclusions: </strong>The Index for Interceptive Orthodontics Referral was developed and validated for the dental frontliners to identify and prioritize the developing malocclusion in children based on its severity and refer for orthodontic consultation to increase the possibility for interceptive orthodontics.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 2","pages":"116-124"},"PeriodicalIF":1.9,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/b2/50/kjod-53-2-116.PMC10040290.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9192082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional evaluation of mandibular width after mandibular asymmetric setback surgery using sagittal split ramus osteotomy.","authors":"Seong-Sik Kim, Sung-Hun Kim, Yong-Il Kim, Soo-Byung Park","doi":"10.4041/kjod22.077","DOIUrl":"10.4041/kjod22.077","url":null,"abstract":"<p><strong>Objective: </strong>The study aimed to evaluate the changes in mandibular width after sagittal split ramus osteotomy (SSRO) in patients with mandibular asymmetric prognathism using cone-beam computed tomography (CBCT).</p><p><strong>Methods: </strong>Seventy patients who underwent SSRO for mandibular setback surgery were included in two groups, symmetric (n = 35) and asymmetric (n = 35), which were divided according to the differences in their right and left setback amounts. The mandibular width was evaluated three-dimensionally using CBCT images taken immediately before surgery (T1), 3 days after surgery (T2), and 6 months after surgery (T3). Repeated measures analysis of variance was applied to verify the differences in mandibular width statistically.</p><p><strong>Results: </strong>Both groups showed a significant increase in the mandibular width at T2, followed by a significant decrease at T3. No significant difference was observed between T1 and T3 in any of the measurements. No significant differences were found between the two groups (<i>p</i> > 0.05).</p><p><strong>Conclusions: </strong>After mandibular asymmetric setback surgery using SSRO, the mandibular width increased immediately but returned to its original width 6 months after surgery.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 2","pages":"99-105"},"PeriodicalIF":2.6,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/46/b0/kjod-53-2-99.PMC10040291.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9192077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accuracy of three-dimensional periodontal ligament models generated using cone-beam computed tomography at different resolutions for the assessment of periodontal bone loss.","authors":"Hangmiao Lyu,&nbsp;Li Xu,&nbsp;Huimin Ma,&nbsp;Jianxia Hou,&nbsp;Xiaoxia Wang,&nbsp;Yong Wang,&nbsp;Yijiao Zhao,&nbsp;Weiran Li,&nbsp;Xiaotong Li","doi":"10.4041/kjod22.120","DOIUrl":"https://doi.org/10.4041/kjod22.120","url":null,"abstract":"<p><strong>Objective: </strong>To develop a method for generating three-dimensional (3D) digital models of the periodontal ligament (PDL) using 3D cone-beam computed tomography (CBCT) reconstruction and to evaluate the accuracy and agreement of the 3D PDL models in the measurement of periodontal bone loss.</p><p><strong>Methods: </strong>CBCT data collected from four patients with skeletal Class III malocclusion prior to periodontal surgery were reconstructed at three voxel sizes (0.2 mm, 0.25 mm, and 0.3 mm), and 3D tooth and alveolar bone models were generated to obtain digital PDL models for the maxillary and mandibular anterior teeth. Linear measurements of the alveolar bone crest obtained during periodontal surgery were compared with the digital measurements for assessment of the accuracy of the digital models. The agreement and reliability of the digital PDL models were analyzed using intra- and interexaminer correlation coefficients and Bland-Altman plots.</p><p><strong>Results: </strong>Digital models of the maxillary and mandibular anterior teeth, PDL, and alveolar bone of the four patients were successfully established. Relative to the intraoperative measurements, linear measurements obtained from the 3D digital models were accurate, and there were no significant differences among different voxel sizes at different sites. High diagnostic coincidence rates were found for the maxillary anterior teeth. The digital models showed high intra- and interexaminer agreement.</p><p><strong>Conclusions: </strong>Digital PDL models generated by 3D CBCT reconstruction can provide accurate and useful information regarding the alveolar crest morphology and facilitate reproducible measurements. This could assist clinicians in the evaluation of periodontal prognosis and establishment of an appropriate orthodontic treatment plan.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 2","pages":"77-88"},"PeriodicalIF":1.9,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/29/bd/kjod-53-2-77.PMC10040289.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9192078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}