American Journal of Orthodontics and Dentofacial Orthopedics最新文献

{"title":"Effects of orientation and postprocessing on the bonding of 3-dimensional printed brackets to printable permanent crown resin","authors":"Serpil Çokakoğlu ,&nbsp;Isil Karaokutan ,&nbsp;Suleyman Kutalmıs Buyuk","doi":"10.1016/j.ajodo.2024.11.009","DOIUrl":"10.1016/j.ajodo.2024.11.009","url":null,"abstract":"<div><h3>Introduction</h3><div>This study aimed to evaluate the effects of different printing orientations and postcuring processes on the bonding performance of 3-dimensional (3D)-printed brackets to permanent crown resin.</div></div><div><h3>Methods</h3><div>A total of 90 disk-shaped specimens (2 mm thickness and 10 mm diameter) were manufactured from printable resin material (Formlabs Permanent Crown, Formlabs Inc, Somerville, Mass). The 3D printed brackets were fabricated at 3 build angles (0°, 45°, and 90°) with a 50 μm layer thickness. Each group consisted of 30 brackets. After printing, the postprocessing was performed either with or without glycerin immersion. Each printed resin surface and bracket base were sandblasted with 50 μm aluminum oxide particles before the bonding procedure. The 3D printed brackets were bonded with a conventional orthodontic composite resin (Transbond XT Primer, 3M Unitek, Monrovia, Calif) to printable resin surfaces. After thermal cycling, the shear bond strength (SBS) test was applied, and bonding failure was examined under a stereomicroscope at 10× magnification. Two-way analysis of variance, post-hoc Tukey, and chi-square tests were used for data analysis.</div></div><div><h3>Results</h3><div>Both orientation and postprocessing had significant effects on SBS. The 3D-printed brackets with 90° and glycerin immersion postcuring demonstrated the highest (13.74 ± 4.52 MPa), whereas 45° orientation without glycerin showed the lowest (7.06 ± 4.32 MPa) SBS. All specimens had cohesive-type bonding failures mainly accompanied by bracket fractures and without surface damage. The least fracture was found in 3D-printed brackets with the highest SBS.</div></div><div><h3>Conclusions</h3><div>The 3D printed brackets with 90° orientation and glycerin immersion postprocessing demonstrated the best bonding performance when applied to the printable permanent crown resin material.</div></div>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":"167 3","pages":"Pages 362-370"},"PeriodicalIF":2.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of a novel form of structural classification of the pterygopalatine suture for predicting midpalatal suture expansion by miniscrew-assisted rapid palatal expansion in adults: A cohort study.","authors":"Wenyi Zhang, Miri Chung, Yifeng Qian, Yanfei Zhu, Lingyong Jiang","doi":"10.1016/j.ajodo.2024.12.006","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.12.006","url":null,"abstract":"<p><strong>Introduction: </strong>This study proposes a novel structural parameter, the insertion depth of the pyramidal process into the pterygoid notch (IDP), as a measure of pterygopalatine suture (PPS) resistance during palatal expansion and aims to evaluate the correlation between the IDP-based PPS classification and midpalatal suture (MPS) expansion.</p><p><strong>Methods: </strong>Preexpansion and postexpansion cone-beam computed tomography images of 23 adults treated with miniscrew-assisted rapid palatal expansion were superimposed. After superimposition, the IDP, sagittal position of the expander, bone thickness penetrated by the miniscrews, PPS separation status (PPS_sep), and MPS expansion at the anterior and posterior nasal spines (hemi-AME and hemi-PME) were determined. To analyze the plausibility of PPS_sep as a mediating variable, regressions were performed to confirm the correlation between PPS_sep and both MPS expansion and IDP. The optimal cut-off point of the IDP for predicting PPS_sep (OC_IDP) was obtained when Youden's index reached a maximum. Finally, the correlation between the OC_IDP-based PPS classification and the MPS expansion was analyzed using linear regression.</p><p><strong>Results: </strong>Both hemi-AME and hemi-PME increased significantly with PPS separation (regression coefficient [b] = 0.88 and 1.25, respectively; P <0.01). IDP was negatively correlated with the probability of PPS separation (P <0.01), and the OC_IDP was 1.90 mm (area under the curve = 0.901). The OC_IDP-based PPS classification showed significant correlations with both hemi-AME and hemi-PME (b = -0.59 and -0.87, respectively; P <0.05).</p><p><strong>Conclusions: </strong>PPS separation promotes skeletal expansion. The greater the IDP, the lower the probability of PPS separation. OC_IDP-based PPS classification is an effective predictor of MPS expansion in miniscrew-assisted rapid palatal expansion-treated adults.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143476547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Factors influencing prophylactic extraction of mandibular third molars in orthodontic practice: A cross-sectional study.","authors":"Hila Ziv-On, Amir Laviv, Moshe Davidovitch, Noa Sadan, Waseem A Abboud, Michael V Joachim","doi":"10.1016/j.ajodo.2024.12.012","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.12.012","url":null,"abstract":"<p><strong>Introduction: </strong>Prophylactic extraction of mandibular third molars remains controversial in orthodontics, with variability in clinical decision-making. This study aimed to identify the factors influencing prophylactic extraction among Israeli orthodontists.</p><p><strong>Methods: </strong>A cross-sectional survey was conducted using an online questionnaire distributed to 88 active orthodontic specialists and residents practicing in Israel. The questionnaire assessed the demographic characteristics and factors associated with prophylactic extractions. Statistical analyses included descriptive statistics, chi-square tests, Fisher exact test, Pearson's correlation, Cochran's Q test, and multivariate logistic regression.</p><p><strong>Results: </strong>Impaction characteristics were the most frequently considered factors for prophylactic extraction (35.2%), followed by mandibular arch crowding (26.1%). Only 4.5% of orthodontists routinely referred patients for prophylactic extractions. No significant correlations were found between the demographic factors and extraction practices. A marginally significant and weak positive correlation between age and consideration of mandibular arch crowding (r = 0.21; P = 0.049) was observed. Cochran's Q test indicated significant differences in the prioritization of factors (Q = 32.24; P <0.001), with impaction characteristics and mandibular arch crowding being considered significantly more prevalent than future pericoronitis.</p><p><strong>Conclusions: </strong>The decision to recommend prophylactic extraction of mandibular third molars is primarily influenced by impaction characteristics and concerns about mandibular arch crowding rather than demographic factors. This variability in decision-making highlights the need for evidence-based guidelines to support orthodontists in managing third molars during treatment.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143450880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexible and rigid guidance in skeletally-anchored maxillary molar distalization: The miniscrew-supported pendulum vs the Beneslider.","authors":"Poyraz Bulut, Nilüfer İrem Tunçer","doi":"10.1016/j.ajodo.2024.11.015","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.11.015","url":null,"abstract":"<p><strong>Introduction: </strong>This study aimed to demonstrate the effects of flexible and rigid appliance designs on maxillary molar distalization.</p><p><strong>Methods: </strong>Thirty-six patients with bilateral Class II molar relationships and fully erupted maxillary second molars were included in this study. Half of the patients were treated with the miniscrew-supported pendulum appliance (group 1; aged 16.5 ± 2.1 years) and the other half with the Beneslider appliance (group 2; aged 15.6 ± 1.5 years). Lateral cephalometric radiographs and digital dental models were used to study the dentoalveolar and skeletal changes.</p><p><strong>Results: </strong>Distalization time was significantly shorter in group 1 (P = 0.006); however, the first molars in this group displayed considerably more distal tipping (P = 0.030), with lower distalization values (P = 0.022) and rates measured at the crown (P = 0.248), trifurcation (P = 0.410), and root apex levels (P = 0.048). Distalization at the apex level occured only in the Beneslider group, with a root-to-crown distalization ratio of 33.5%. SNB angle decreased (P = 0.010), and ANB (P = 0.010) and SN-GoGn angles (P = 0.010) increased significantly in group 1, all of which were negligible in group 2. Distobuccal rotation of the first molars was significantly higher in group 1 (P = 0.004). The amount of distalization, distal tipping of the maxillary second molars, and appliance success rates were comparable between the groups.</p><p><strong>Conclusions: </strong>The Beneslider appliance provided faster maxillary molar distalization with substantially less distal tipping and rotation. In contrast, the miniscrew-supported pendulum appliance led to the posterior rotation of the mandible, worsened the sagittal and vertical parameters, and failed to provide distalization at the apex. In summary, our findings indicated that a rigid design for maxillary molar distalization yields more favorable outcomes.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143426607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative analysis of root resorption and alveolar remodeling in maxillary incisors during orthodontic-orthognathic surgical treatment of skeletal Class III malocclusion.","authors":"Xiaoya He, Xingyu Zhou, Ya Cui, Xiaojing Li, Yucong Zhou, Yunhui Xia, Min Zhu, Jiaqiang Liu, Lixia Mao","doi":"10.1016/j.ajodo.2024.12.007","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.12.007","url":null,"abstract":"<p><strong>Introduction: </strong>This retrospective clinical study investigated root length and periodontal changes around maxillary incisors in patients with Class III skeletal malocclusion treated with fixed appliances (FAs) and clear aligners (CAs) by cone-beam computed tomography.</p><p><strong>Methods: </strong>A total of 60 patients were equally divided into 2 groups based on the appliance type; cone-beam computed tomography scans were obtained before treatment, after presurgical orthodontic treatment, and after orthodontic-orthognathic treatment. The measurements of root length, vertical alveolar bone level, and horizontal alveolar bone thickness at 4 levels (3, 6, and 9 mm from the cementoenamel junction and root apex level) surrounding the maxillary incisors were compared. The tooth movement of maxillary incisors during the presurgical phase was evaluated.</p><p><strong>Results: </strong>The root length of maxillary incisors decreased in both groups, with the CA group experiencing a small reduction (1.09 ± 0.70 mm) compared with the FA group (1.29 ± 0.73 mm) after treatment. The FA group showed more pronounced reductions in palatal alveolar bone thickness and vertical alveolar bone level, along with greater root lingual movement during the presurgical orthodontic phase. Postsurgically, although both groups saw an increase in labial incisor inclination, the FA group primarily exhibited root lingual movement, as opposed to the labial tipping movement observed in the CA group.</p><p><strong>Conclusions: </strong>The results indicated that FAs and CAs could trigger root resorption and marginal alveolar bone loss, with FA treatment associated with a more pronounced impact. Although CA may offer advantages in minimizing root resorption and conserving alveolar bone integrity, it provides inferior control over anterior torque compared with FA. Careful consideration is crucial to prevent iatrogenic degeneration during the whole phase of orthodontic-orthognathic surgical treatment.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143411432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationship between discrimination, personality traits, and dentofacial features among schoolchildren in Jordan.","authors":"Zaid B Al-Bitar, Hawazen N Sonbol, Hala M Allawama, Lamis D Rajab, Sarah Abu Arqub, Mahmoud K Al-Omiri","doi":"10.1016/j.ajodo.2024.12.009","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.12.009","url":null,"abstract":"<p><strong>Introduction: </strong>The objective of this study was to evaluate the influence of dentofacial features on experiences of discrimination and to examine their potential association with personality factors among schoolchildren in Jordan.</p><p><strong>Methods: </strong>This cross-sectional study involved 1166 ninth and tenth-grade school children, comprising 707 girls and 459 boys, aged 14-16 years (mean age 14.97 ± 0.84 years). Participants were recruited from randomly selected schools and requested to complete 2 questionnaires. The first questionnaire investigated discrimination experiences, and the second was the NEO Five-Factor Inventory questionnaire, which was used to assess the participants' 5 major personality factors: neuroticism, extraversion, openness, agreeableness, and conscientiousness. Relationships among variables were identified using chi-square and Fisher exact tests. Variations based on sex and the presence of discrimination were identified using the Mann-Whitney U test. Hierarchical logistic regression analysis was conducted to determine the odds of being exposed to discrimination based on dental problems and personality factors. Statistical significance was determined at 95% confidence intervals, with 2-tailed α values of ≤0.05.</p><p><strong>Results: </strong>The prevalence of reported discrimination was 58.8% (n = 686); significantly more girls reported being discriminated against than boys (P <0.001). Approximately 20% of the participants reported being discriminated against because of their dentofacial features. The 3 most commonly reported dentofacial features that discriminated participants were tooth color (6.9%), spacing between teeth (6.6%), and proclined maxillary anterior teeth (5.1%). Hierarchical logistic regression analysis demonstrated that higher neuroticism scores, higher openness scores, and problems with dental or oral features were associated with higher odds of being exposed to discrimination (P <0.05).</p><p><strong>Conclusions: </strong>Jordanian students reported a high incidence of discrimination, which was often linked to their dental or facial appearance. This discrimination was significantly associated with personality traits and specific dentofacial features.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143383975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predictability of mesiodistal tip of maxillary central incisors in clear aligner therapy.","authors":"Annabel Hoe, Elissa Freer, Phillip Kia Teng Goh, Desmond Ong, Hien Nguyen, Tony Weir","doi":"10.1016/j.ajodo.2024.12.005","DOIUrl":"10.1016/j.ajodo.2024.12.005","url":null,"abstract":"<p><strong>Introduction: </strong>Correct positioning of the maxillary central incisors (MxCIs) is a vital component of smile esthetics and the success of orthodontic treatment. This study investigated the efficacy of Invisalign SmartTrack aligners in achieving the mesiodistal tip of MxCIs, with an objective comparison to the ClinCheck (Align Technology, San Jose, Calif) prediction.</p><p><strong>Methods: </strong>A total of 174 MxCI teeth from 87 adult patients were selected from the Australasian Aligner Research Database. All patients exhibited pretreatment overlapping MxCI crowns and were treated with Invisalign SmartTrack aligners. The pretreatment tooth position, the planned mesiodistal tip movement using the ClinCheck software, and the achieved posttreatment tooth position were analyzed.</p><p><strong>Results: </strong>In the planned mesial root tip MxCI group, the mean planned and achieved mesial tips were 2.53° (standard error [SE], 0.29°) and 2.22° (SE, 0.42°), respectively, indicating an undercorrection of 0.31° (SE, 0.38°) (P >0.05). For the planned distal root tip MxCI group, the mean planned and achieved distal tips were 2.09° (SE, 0.22) and 0.39° (SE, 0.36°), respectively, indicating a mean undercorrection of 1.70° (SE, 0.39°) (P <0.001). There was no statistically significant association between the presence of attachments and the efficacy of the mesiodistal tip for MxCIs (P >0.05). No significant relationship was found (P >0.05) between the 1- or 2-week wear schedule and the efficacy of achieving the mesiodistal tip for MxCIs.</p><p><strong>Conclusions: </strong>The overall percentage accuracy of mesiodistal tip movements for MxCIs when using Invisalign SmartTrack aligners was 53.3%. The presence of attachments and the influence of a 1- vs 2-week wear schedule were not found to have any significant influence on the efficacy of achieving planned mesiodistal tip movements for MxCIs.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143383971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal anteroposterior position of the maxillary central incisors and its relationship to the forehead in adult Asian males.","authors":"Maria Doughan, Jessica Kocan Itani, Timothy Tremont, Dina Sanchez","doi":"10.1016/j.ajodo.2024.12.008","DOIUrl":"https://doi.org/10.1016/j.ajodo.2024.12.008","url":null,"abstract":"<p><strong>Introduction: </strong>The objective of this study was to determine the optimal anteroposterior (AP) position of the maxillary central incisors (CIs) and its relationship with the forehead in adult Asian males.</p><p><strong>Methods: </strong>Smiling profile photographs of 60 Asian males were obtained and divided into 3 groups based on the judged AP position of CI (just about right, too far forward, and too far back), as evaluated by orthodontists and laypersons. The CI position and forehead inclination (FI) were measured relative to the glabella vertical (GV). Statistical analysis was used to test for differences among groups, differences between orthodontists and laypersons, and the relationship between CI position and FI.</p><p><strong>Results: </strong>The optimal CI position was 0.86 mm anterior to GV. There were statistical differences between orthodontists and laypersons in the too-far-forward (P = 0.0001) and too-far-back (P = 0.0001) groups. One-way analysis of variance revealed significant differences among the 3 groups (P <0.001) for both orthodontists and laypersons, with post hoc analysis confirming that all groups differed significantly from one another (P <0.05). CI position and FI showed a moderate positive correlation (r = 0.42; P <0.001).</p><p><strong>Conclusions: </strong>In Asian males, the AP position of the CI can be evaluated relative to the forehead to optimize the CI position and maximize facial harmony.</p>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":" ","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143383964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Information for readers","authors":"","doi":"10.1016/S0889-5406(24)00532-8","DOIUrl":"10.1016/S0889-5406(24)00532-8","url":null,"abstract":"","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":"167 2","pages":"Page A6"},"PeriodicalIF":2.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Author’s response","authors":"Noriaki Yoshida","doi":"10.1016/j.ajodo.2024.10.009","DOIUrl":"10.1016/j.ajodo.2024.10.009","url":null,"abstract":"","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":"167 2","pages":"Pages 138-139"},"PeriodicalIF":2.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143043033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}