Korean Journal of Orthodontics最新文献_第4页

Assessment of zygomatico-maxillary suture fusion across skeletal maturation stages from preadolescence to young adulthood. 评估颧骨-上颌缝合融合跨越从青春期前到青年期的骨骼成熟阶段。

IF 2.3 3区医学

Korean Journal of Orthodontics Pub Date : 2026-01-25 Epub Date: 2025-09-02 DOI: 10.4041/kjod25.122

Soo-Min Son, Sungmi Jeon, Sungmin Cha, Jeong-Ho Choi, Jong-Wan Kim, Mira Han, Il-Hyung Yang, Jee Hyeok Chung, Byung Jun Kim, Seung-Hak Baek

{"title":"Assessment of zygomatico-maxillary suture fusion across skeletal maturation stages from preadolescence to young adulthood.","authors":"Soo-Min Son, Sungmi Jeon, Sungmin Cha, Jeong-Ho Choi, Jong-Wan Kim, Mira Han, Il-Hyung Yang, Jee Hyeok Chung, Byung Jun Kim, Seung-Hak Baek","doi":"10.4041/kjod25.122","DOIUrl":"10.4041/kjod25.122","url":null,"abstract":"Objective: To characterize the zygomatico-maxillary suture fusion (ZMSF) from preadolescence to young adulthood.Methods: A total of 573 subjects (283 males, 290 females; age, 6-18 years) were divided into 26 groups based on sex and age. Three-dimensional computed tomography images were reconstructed and oriented using ON3D software. The cervical vertebrae maturation index (CVMI) and ZMSF stages were identified using 6-stage and 5-stage scoring systems, respectively. The distributions of CVMI stage and ZMSF stage in each group were statistically analyzed.Results: Females exhibited earlier appearance and a narrower range of onset (CVMI stage-2, ZMSF stage-2), middle (CVMI stage-4, ZMSF stage-3), and completion (CVMI stage-6, ZMSF stage-5), indicating faster skeletal maturation compared to males. Both males and females showed strong positive correlations between age and CVMI stage, between age and ZMSF stage, and between CVMI stage and ZMSF stage (all P < 0.001). The mean ages at ZMSF stage-3 and stage-4 (11.9-14.7 years for males, 9.7-12.6 years for females) may indicate the peak of pubertal growth. Regression equations for ZMSF stage (y), age (a), and CVMI stage (b) were y = -0.508 + (0.169 × a) + (0.509 × b) + (-0.006 × ab) for males and y = -1.227 + (0.285 × a) + (0.804 × b) + (-0.034 × ab) for females. Multivariable ordinal logistic regression analyses indicated that increases in age and progress in CVMI stage were associated with more advanced ZMSF stage, suggesting that ZMSF follows the general skeletal maturation curve.Conclusions: The ZMSF stages showed strong correlations with age and progression of the CVMI stage.","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"56 1","pages":"21-33"},"PeriodicalIF":2.3,"publicationDate":"2026-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12849717/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146031456","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}

引用次数: 0

Upper lip elevation in autonomous maximal smile: A three-dimensional facial imaging study. 自主最大微笑的上唇抬高：三维面部成像研究。

IF 2.3 3区医学

Korean Journal of Orthodontics Pub Date : 2026-01-25 Epub Date: 2025-09-26 DOI: 10.4041/kjod25.026

Ruiting Ren, Xu Zhang, Yutong Chen, Wei Zheng, Yu Li

{"title":"Upper lip elevation in autonomous maximal smile: A three-dimensional facial imaging study.","authors":"Ruiting Ren, Xu Zhang, Yutong Chen, Wei Zheng, Yu Li","doi":"10.4041/kjod25.026","DOIUrl":"10.4041/kjod25.026","url":null,"abstract":"Objective: Three-dimensional (3D) facial images of autonomous maximal smile (AMS) hold unique value for generating orthodontic virtual patients. This study aimed to investigate upper lip elevation (ULE) in AMS using 3D facial images.Methods: A total of 212 Chinese participants with average dental and gingival display in AMS were enrolled and categorized into four groups: male adults (MAdu), female adults (FAdu), male adolescents (MA), and female adolescents (FA). Three-dimensional facial images were taken to measure upper lip length (ULL), philtrum length (PL), and upper vermilion height (UVH) at repose, and to measure upper lip length in AMS (ULL@AMS), ULE, and upper lip elevation ratio (ULER) in AMS. Cephalometric measurements were performed to assess maxillary incisor exposure (U1-Stms) and upper lip thickness (Sn-thickness, Ls-thickness, and Stms-thickness). Statistical analyses were conducted using analysis of variance and Pearson's chi-square tests.Results: MAdu exhibited a significantly longer resting ULL (23.42 ± 2.23 mm) compared with FAdu (22.43 ± 1.83 mm), primarily due to their longer philtrum. ULL@AMS was 18.27 ± 2.20 mm in MAdu and 16.85 ± 2.36 mm in FAdu (P < 0.05); ULE was 5.15 ± 2.26 mm in MAdu and 5.58 ± 1.90 mm in FAdu (P > 0.05); ULER was 0.22 ± 0.09 in MAdu and 0.25 ± 0.08 in FAdu (P < 0.05). Both ULE and ULER were positively correlated with resting ULL and negatively correlated with Ls-thickness.Conclusions: ULL, ULL@AMS and ULE in AMS were precisely measured using 3D imaging across different sex and age groups, offering preliminary normative references for related orthodontic treatment and esthetic procedures.","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"56 1","pages":"34-44"},"PeriodicalIF":2.3,"publicationDate":"2026-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12849716/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146031513","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}

引用次数: 0

Comparative evaluation of ChatGPT, Gemini, and Grok in clinical decision-making and general knowledge assessment for impacted maxillary canines. ChatGPT、Gemini和Grok在阻生上颌牙临床决策和常识评估中的比较评价

IF 2.3 3区医学

Korean Journal of Orthodontics Pub Date : 2026-01-25 Epub Date: 2025-09-26 DOI: 10.4041/kjod25.174

Genta Agani Sabah, Mehmet Gümüş Kanmaz

{"title":"Comparative evaluation of ChatGPT, Gemini, and Grok in clinical decision-making and general knowledge assessment for impacted maxillary canines.","authors":"Genta Agani Sabah, Mehmet Gümüş Kanmaz","doi":"10.4041/kjod25.174","DOIUrl":"10.4041/kjod25.174","url":null,"abstract":"Objective: This study aimed to compare extraction versus orthodontic eruption decisions for impacted maxillary canines made by three artificial intelligence-based chatbots (ChatGPT, Gemini, and Grok) with those made by orthodontist raters, and to evaluate the overall accuracy of these artificial intelligence-generated recommendations.Methods: Thirty-three patients with impacted maxillary canines were selected, and standardized case scenarios incorporating key diagnostic parameters were presented to the three chatbots. Their treatment decisions were recorded and compared with orthodontists' consensus decisions. Additionally, 10 general queries regarding impacted maxillary canines were submitted to the chatbots. The responses were rated by three orthodontists using a modified 5-point Global Quality Score.Results: The chatbots and orthodontists showed moderate agreement regarding treatment decisions (κ = 0.411-0.524, P < 0.05). Gemini produced significantly more discordant responses, frequently over-recommending orthodontic eruptions (P = 0.002), whereas Grok and ChatGPT received significantly higher scores than Gemini in the case-based scenarios (P < 0.001). Grok outperformed both ChatGPT and Gemini for general queries (P = 0.006).Conclusions: While Gemini showed lower clinical alignment with orthodontists for treatment decisions regarding impacted canines, ChatGPT and Grok demonstrated moderate agreement with orthodontists and produced relatively accurate responses. These findings highlight the potential of chatbots as supportive tools for orthodontic decision-making. However, their use requires careful supervision to avoid the risks associated with inaccurate or misleading recommendations.","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"56 1","pages":"45-56"},"PeriodicalIF":2.3,"publicationDate":"2026-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12849713/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146031528","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}

引用次数: 0

The effects of hypoxia inducible factor-1α in myeloid cells and a high-salt diet in a mouse model of orthodontic tooth movement. 髓细胞缺氧诱导因子-1α和高盐饮食对正畸牙齿运动小鼠模型的影响。

IF 2.3 3区医学

Korean Journal of Orthodontics Pub Date : 2026-01-25 Epub Date: 2025-05-14 DOI: 10.4041/kjod24.295

Valentin Jüngel, Eva Paddenberg-Schubert, Kathrin Renner, Anna Damanaki, Tobias Bopp, Christian Kirschneck, Agnes Schröder, Jonathan Jantsch, Peter Proff

{"title":"The effects of hypoxia inducible factor-1α in myeloid cells and a high-salt diet in a mouse model of orthodontic tooth movement.","authors":"Valentin Jüngel, Eva Paddenberg-Schubert, Kathrin Renner, Anna Damanaki, Tobias Bopp, Christian Kirschneck, Agnes Schröder, Jonathan Jantsch, Peter Proff","doi":"10.4041/kjod24.295","DOIUrl":"10.4041/kjod24.295","url":null,"abstract":"Objective: Force application during orthodontic tooth movement (OTM) promotes oxygen depletion and bone remodeling. Deficiency of hypoxia inducible factor-1α (HIF1α) in myeloid cells accelerates OTM. Low-oxygen and high-salt conditions can stabilize HIF1α in myeloid cells. This study aimed to determine whether myeloid HIF1α levels influence OTM under low- and high-salt diets in mice.Methods: Mice with and without HIF1α expression in myeloid cells received a low-salt (< 0.03% NaCl, tap water) or an high-salt (4% NaCl, saline) diet for two weeks. One week after the start of the diet, an elastic band was inserted between the first and second molars. The expression of inflammatory and bone remodeling genes, bone density, and extent of OTM were determined.Results: Myeloid Hif1α expression did not modify high-salt-induced expression of the inflammatory genes interleukin-1β and interleukin-6. Myeloid-derived Hif1α and dietary salt levels did not significantly modify osteoblast responses to OTM. High-salt conditions and myeloid Hif1α deletion increased osteoclast numbers and expression of osteoclast-specific genes. This was paralleled by reduced bone density, which ultimately led to increased OTM.Conclusions: A high-salt diet and the absence of HIF1α both lead to increased OTM. In the tested OTM model, exposure to high-salt conditions was largely independent of myeloid cell-derived HIF1α.","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"56 1","pages":"1-10"},"PeriodicalIF":2.3,"publicationDate":"2026-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12849714/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146031566","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}

引用次数: 0

Cytotoxic effect of 3D-printed and thermoformed clear aligner materials on human oral fibroblasts: An in vitro study. 3d打印和热成型透明对准材料对人口腔成纤维细胞的细胞毒性作用：一项体外研究。

IF 2.3 3区医学

Korean Journal of Orthodontics Pub Date : 2025-11-25 Epub Date: 2025-08-08 DOI: 10.4041/kjod25.132

Ružica Bandić, Ivna Vuković Kekez, Katarina Vodanović Stranput, Nensi Bralić, Vedrana Čikeš Čulić, Ivana Medvedec Mikić, Ivan Galić, Gordana Paić Karega, Danijela Kalibović Govorko

{"title":"Cytotoxic effect of 3D-printed and thermoformed clear aligner materials on human oral fibroblasts: An in vitro study.","authors":"Ružica Bandić, Ivna Vuković Kekez, Katarina Vodanović Stranput, Nensi Bralić, Vedrana Čikeš Čulić, Ivana Medvedec Mikić, Ivan Galić, Gordana Paić Karega, Danijela Kalibović Govorko","doi":"10.4041/kjod25.132","DOIUrl":"10.4041/kjod25.132","url":null,"abstract":"Objective: To compare the cytotoxicity of three dimensional (3D)-printed resins and conventional materials used for orthodontic aligner production.Methods: 3D-printed materials such as 3Dresyn OD-Clear, Clear A, and Tera Harz TC-85 were compared with one thermoplastic material-Duran+. The samples were stored in artificial saliva at 37°C for 7 and 14 days to simulate the oral conditions during one phase of aligner therapy. The saliva was subsequently diluted with cell culture medium to concentrations of 10% (c1), 20% (c2), and 30% (c3). The cytotoxicity of the materials was assessed in human oral fibroblasts using the CCK-8 assay after incubation periods of 4 hours, 24 hours, 48 hours, and 72 hours.Results: Cytotoxic effects were observed for Clear A (62.9% cell viability at c3; 7 days in saliva; 72-hour incubation) and Tera Harz (69.2% cell viability at c3; 14 days in saliva; 72-hour incubation). Significant differences under certain conditions were found between the following material pairs: Clear A and Tera Harz, Clear A and Duran+, 3Dresyn and Clear A, and 3Dresyn and Duran+ (P < 0.05). There were significant differences between the c1 and c3 for specific materials and incubation times (P < 0.05). No significant difference was found between the 7-day and 14-day aligner-wearing protocols (P > 0.05).Conclusions: Among the tested materials, 3Dresyn OD-Clear and Duran+ demonstrated consistently good biocompatibility, highlighting their potential for safe clinical use. Although the other materials were generally biocompatible, they exhibited cytotoxic effects under certain conditions, underscoring the need for thorough testing to ensure safe clinical use.","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"55 6","pages":"477-486"},"PeriodicalIF":2.3,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12644642/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145589759","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}

引用次数: 0

Effects of 3- and 6-weekly orthodontic activation protocols on the alignment of mandibular anterior teeth: A single-center randomized clinical trial. 3周和6周正畸激活方案对下颌前牙排列的影响：一项单中心随机临床试验

IF 2.3 3区医学

Korean Journal of Orthodontics Pub Date : 2025-11-25 Epub Date: 2025-07-07 DOI: 10.4041/kjod24.262

Muhammad Aman, Waqar Jeelani, Maheen Ahmed, Abdul Muqeet Chughtai, Mirza Ezaaf Shuja

{"title":"Effects of 3- and 6-weekly orthodontic activation protocols on the alignment of mandibular anterior teeth: A single-center randomized clinical trial.","authors":"Muhammad Aman, Waqar Jeelani, Maheen Ahmed, Abdul Muqeet Chughtai, Mirza Ezaaf Shuja","doi":"10.4041/kjod24.262","DOIUrl":"10.4041/kjod24.262","url":null,"abstract":"Objective: To compare the effectiveness of 3- and 6-weekly orthodontic activation protocols on the alignment of crowded lower anterior teeth.Methods: This randomized clinical trial involved 63 participants (29 males and 34 females) aged 16-30 years who had Little's Irregularity Index (LII) values of ≥ 5 to ≤ 11 mm and required treatment with a straight-wire appliance (SWA) with extraction of the lower first premolars. The patients were randomly allocated to 3- and 6-weekly activation groups and treated with a metallic SWA (0.022 × 0.028 slot size) and heat-activated nickel-titanium archwires of 0.014 to 0.020 inch diameter by a blinded orthodontist. The LII was measured using stone models, and the pain associated with orthodontic activation was assessed using a visual analog scale. Measurements were recorded at 0, 6, 12, 18, and 24 weeks after commencement of treatment. Root resorption in the lower anterior teeth was assessed using pre- and post-treatment small-field-of-view cone-beam computed tomography scans.Results: The mean pretreatment LII was comparable between the 3- and 6-weekly activation groups (P = 0.865). However, at all subsequent visits, the 3-weekly activation group showed significantly lower LII values (P < 0.05). During the first six weeks, relief from crowding was greater in the 3-weekly activation group (P = 0.036). However, by the 12th week, the correction in LII was comparable between the two groups (P > 0.05). Mean pain score and root resorption showed no significant differences between the two groups.Conclusions: The 3-weekly activation group showed greater and more rapid relief in mandibular anterior crowding than the 6-weekly activation group without causing more discomfort or root resorption.","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"55 6","pages":"465-476"},"PeriodicalIF":2.3,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12644638/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145589699","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}

引用次数: 0

READER'S FORUM. 读者的论坛。

IF 2.3 3区医学

Korean Journal of Orthodontics Pub Date : 2025-11-25 DOI: 10.4041/kjod55.0006RF

Hyo-Won Ahn

引用次数: 0

The effects of low-yield nicotine cigarette smoke inhalation on orthodontic tooth movement. 低产量尼古丁香烟烟雾吸入对正畸牙齿运动的影响。

IF 2.3 3区医学

Korean Journal of Orthodontics Pub Date : 2025-11-25 Epub Date: 2025-09-09 DOI: 10.4041/kjod25.005

Burak Gulnar, Ahsen Gulnar, Alperen Kamiloglu, Peter Petocz, Ersan Karadeniz, Carmen Gonzales Karadeniz

{"title":"The effects of low-yield nicotine cigarette smoke inhalation on orthodontic tooth movement.","authors":"Burak Gulnar, Ahsen Gulnar, Alperen Kamiloglu, Peter Petocz, Ersan Karadeniz, Carmen Gonzales Karadeniz","doi":"10.4041/kjod25.005","DOIUrl":"10.4041/kjod25.005","url":null,"abstract":"Objective: This study aimed to investigate the effects of low-nicotine cigarette smoke (CS) inhalation on orthodontic tooth movement (OTM) in rats.Methods: Forty 4-week-old male Wistar rats, were randomly divided into four groups: three experimental and one control. Group 1 (control group) had dental impressions taken at week 9. Group 2: OTM group received a continuous mesially directed force applied to the maxillary first molar at week 9 for 4 weeks. Group 3: CS group rats had 9 weeks of CS inhalation; Group 4: CS + OTM group, 9 weeks of CS inhalation and 4 weeks of orthodontic force application. Rats in groups 3 (CS) and 4 (CS + OTM) were exposed to 10 cigarettes for 8 minutes, 3 times per day for 9 weeks. All groups had polyvinyl siloxane impressions taken at week 9 and at the end of the experimental period (week 13). At week 13, all rats were sacrificed under general anesthesia, and their maxillae were dissected and scanned using a TRIOS 2014-1 intraoral scanner. The tooth movements were measured using digital models.Results: A slight increase in tooth movement rate was observed in smokers. However, this difference was not statistically significant.Conclusions: CS inhalation did not increase the rate of OTM in rats.","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":" ","pages":"444-452"},"PeriodicalIF":2.3,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12644640/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145024810","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}

引用次数: 0

Cone-beam computed tomography evaluation of alveolar bone and root changes after clear aligner therapy with different extraction protocols: Balancing tissue loss, tooth control, and treatment alternatives. 锥形束计算机断层扫描评估不同拔牙方案清除矫正器治疗后牙槽骨和牙根的改变：平衡组织损失、牙齿控制和治疗方案。

IF 2.3 3区医学

Korean Journal of Orthodontics Pub Date : 2025-11-25 Epub Date: 2025-09-18 DOI: 10.4041/kjod25.095

Yubohan Zhang, Houzhuo Luo, Xiao Lei, Xu Wang, Wen Qin, Xu Zhang, Xin Li, Zuolin Jin, Yuerong Xu, Jie Gao

{"title":"Cone-beam computed tomography evaluation of alveolar bone and root changes after clear aligner therapy with different extraction protocols: Balancing tissue loss, tooth control, and treatment alternatives.","authors":"Yubohan Zhang, Houzhuo Luo, Xiao Lei, Xu Wang, Wen Qin, Xu Zhang, Xin Li, Zuolin Jin, Yuerong Xu, Jie Gao","doi":"10.4041/kjod25.095","DOIUrl":"10.4041/kjod25.095","url":null,"abstract":"Objective: To evaluate changes in alveolar bone and tooth root dimensions in anterior teeth of patients with different tooth extraction types undergoing clear aligner therapy (CAT) and to provide reliable information for preventing tissue loss and providing tooth control in severe cases through a large-scale sample analysis of the clinical outcomes of CAT.Methods: We selected 281 patients (186 non-extraction [NE], 59 with two-premolar extraction [TPE] in both the maxilla and mandible, and 36 with TPE in the maxilla and one lower-incisor extraction [OLIE] in the mandible) from the records of recent three years. Quantitative changes in the dentoalveolar apparatus were analyzed using pre- (T1) and post-treatment (T2) cone-beam computed tomography. The measured parameters included the alveolar bone height and thickness, and root length in the anterior teeth in different types of tooth extraction.Results: Alveolar bone height loss was common in all groups after CAT. Compared to patients with NE, patients with TPE showed a higher risk of lingual bone dehiscence and torque loss (P < 0.05), whereas those with OLIE showed a higher risk of open gingival embrasures (P < 0.05). A more severe alveolar bone loss was observed in the mandibular anterior teeth than in the maxillary anterior teeth (P < 0.05).Conclusions: Different tooth extraction types can lead to different degrees of bone loss in the direction of tooth movement, and orthodontists should adopt more cautious measures for mandibular anterior teeth. Despite numerous experimental studies for improving techniques and designs in CAT, tooth control and complication prevention in extraction cases remain challenging for orthodontists.","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":" ","pages":"453-464"},"PeriodicalIF":2.3,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12644643/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145082289","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}

引用次数: 0

3D lip changes in skeletal Class III patients with premolar extraction: A prospective cohort study comparing surgery-first and orthodontics-first approaches. 前磨牙拔牙后骨骼III类患者的三维唇形变化：一项前瞻性队列研究，比较手术优先和正畸优先的方法。

IF 2.3 3区医学

Korean Journal of Orthodontics Pub Date : 2025-11-25 Epub Date: 2025-04-07 DOI: 10.4041/kjod24.209

Yuhan Qi, Zhongpeng Yang, Yiran Jiang, Jiale Peng, Siting Chen, Yanfeng Li, Ruoping Jiang

{"title":"3D lip changes in skeletal Class III patients with premolar extraction: A prospective cohort study comparing surgery-first and orthodontics-first approaches.","authors":"Yuhan Qi, Zhongpeng Yang, Yiran Jiang, Jiale Peng, Siting Chen, Yanfeng Li, Ruoping Jiang","doi":"10.4041/kjod24.209","DOIUrl":"10.4041/kjod24.209","url":null,"abstract":"Objective: To investigate the three-dimensional (3D) changes in lip morphology introduced by different surgical orthodontic treatment approaches in skeletal Class III patients.Methods: Forty Class III patients were treated using the surgery-first approach (SFA, n = 20) or a three-stage approach (TSA, n = 20), both involving bimaxillary surgery and maxillary premolar extractions. Cephalograms and facial scans were obtained at different time points (T0-T5) throughout the treatment period. T tests and repeated measures analysis of variance were compared to 3D lip morphology between groups. Correlation analysis and stepwise linear regression were used for prediction.Results: After debonding, mandibular incisors in the SFA group were positioned more lingually (L1MP: SFA 80.75 ± 5.73°, TSA 89.78 ± 5.88°, P < 0.001), and the smaller ANB values (SFA 1.04 ± 1.43°, TSA 2.19 ± 0.99°, P = 0.005). Upper vermilion length increased in both groups after debonding, while lower vermilion length decreased significantly. The lower vermillion length in the SFA group was shorter than that in the TSA group (SFA 8.66 ± 2.01 mm, TSA 10.35 ± 2.19 mm, P = 0.015). ΔU1-AP, ΔANB, and ΔWits were significantly correlated with 3D lip morphology changes.Conclusions: Both methods significantly improved the aesthetics of lip morphology in skeletal Class III patients. When the extraction space was closed, the lip shape was nearly stable in the SFA; TSA was stabilized 6 months post-surgery. The lips exhibited a compensatory response to differences in hard tissue and showed a moderate association with changes in dental and skeletal measurements.","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"55 6","pages":"429-443"},"PeriodicalIF":2.3,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12644641/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145589756","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}

引用次数: 0