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Ocak I, Karsli N, Altug AT, Aksu M. Relationship between vertical facial morphology and dental arch measurements in class II malocclusion: a retrospective study. PeerJ 2023; 11:e16031. [PMID: 37692120 PMCID: PMC10487581 DOI: 10.7717/peerj.16031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 08/13/2023] [Indexed: 09/12/2023] Open
Abstract
Background To evaluate the relationship between dental arch measurements and the vertical facial pattern determined in skeletal Class II untreated patients. Methods Lateral cephalograms and plaster models were obtained from 124 untreated female adults (average age: 17.6 ± 3.8 years). Class I (CI), Class II Division 1 (CII/1) and Class II Division 2 (CII/2) malocclusions were divided into three subgroups according to their vertical morphology as hypodivergent, normodivergent and hyperdivergent. The multivariate variance analysis (MANOVA) method was used in the comparison of measurement values according to vertical and sagittal morphology. The relationship between both A point-Nasion-B point (ANB) and Frankfurt-mandibular plane (FMA) angles and dental arch measurements was examined by Pearson correlation analysis. The significance level was received as p < 0.05. Results While vertical morphology has a statistically significant effect on mandibular arch length, sagittal morphology affects maxillary arch depth. The parameters influenced by both morphologies are maxillary and mandibular arch length, as well as maxillary intermolar width. The mandibular arch length was significantly shorter in hyperdivergent-CII-2 malocclusion (50.5 ± 7.4 mm). Larger values were obtained in both mandibular arch length and maxillary arch depth measurements in CII-1 malocclusion compared to CII-2 malocclusion. The maxillary intermolar width was significantly shorter in hypodivergent-CII-1 malocclusion (46.8 ± 3.4 mm), while it was higher in hypodivergent-CI malocclusion (51.1 ± 3.4 mm). The maxillary arch length was the lowest in hyperdivergent-CI malocclusion (63.1 ± 13.3 mm) and the highest in hypodivergent-CI malocclusion (72.8 ± 7.6 mm). Additionally, a positive but weak correlation was found between ANB and FMA angles. Conclusion Dental arch measurements have been found to be affected by both vertical facial morphology and skeletal sagittal relationship. A positive correlation was found between ANB and FMA angles.
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Affiliation(s)
- Irmak Ocak
- Department of Orthodontics, Faculty of Dentistry, Ankara Medipol University, Ankara, Turkey
| | - Nurver Karsli
- Department of Orthodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey
| | - Ayse Tuba Altug
- Department of Orthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey
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Saadeh ME, Ghafari JG. Uniformity of palatal volume and surface area in various malocclusions. Orthod Craniofac Res 2023; 26:72-80. [PMID: 35470544 DOI: 10.1111/ocr.12580] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 04/14/2022] [Accepted: 04/20/2022] [Indexed: 01/11/2023]
Abstract
AIMS To assess palatal volume, surface area and linear dimensions across sagittal and vertical components of malocclusion. METHODS Pre-treatment cephalographs and dental casts of 178 non-growing patients (88 males, 90 females, age 25.81 ± 8.23 years) were used for classification in sagittal malocclusion groups: Class I (n = 48), Class II division 1 (n = 42), Class II division 2 (n = 40) and Class III (n = 48); and in vertical divergence groups based on the MP/SN angle: hypodivergent (n = 35), normodivergent (n = 95) and hyperdivergent (n = 48). Dental casts were scanned and palatal measurements recorded: palatal width, depth and interdental distances; palatal surface area (PSA, mm2 ) and volume (PV, mm3 ). A 3-way ANOVA was used to compare palatal dimensions across groups. Pearson product-moment correlations were employed to assess associations among variables. RESULTS PSA and PV (in both sex groups) were not statistically significantly different across sagittal malocclusions and vertical patterns. Significant differences were depicted more among the vertical divergence groups than sagittal groups. Correlations between PSA and PV and palatal dimensions were low to moderate. Predictability of PSA and PV ranged between 15 and 18%. CONCLUSION The finding of similar palatal volume and surface area, on average, across malocclusions possibly underscores the limitations of environmental influences within the inherited orofacial phenotype. The vertical facial pattern seems to be more interactive with palatal dimensions than sagittal relations. Studies of palatal changes following orthodontic and orthognathic treatments are warranted.
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Affiliation(s)
- Maria E Saadeh
- Department of Forensic Odontology, Faculty of Dental Medicine, Lebanese University, Beirut, Lebanon.,Department of Orthodontics, Faculty of Dental Medicine, Lebanese University, Beirut, Lebanon.,Division of Orthodontics and Dentofacial Orthopedics, American University of Beirut Medical Center, Beirut, Lebanon
| | - Joseph G Ghafari
- Division of Orthodontics and Dentofacial Orthopedics, American University of Beirut Medical Center, Beirut, Lebanon.,Department of Orthodontics, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Tervahauta E, Nokela J, Vuollo V, Pirttiniemi P, Silvola AS. Associations of sagittal malocclusions with dental arch characteristics and crowding in Northern Finland Birth Cohort 1966. Orthod Craniofac Res 2021; 25:468-475. [PMID: 34905291 DOI: 10.1111/ocr.12558] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 12/02/2021] [Accepted: 12/07/2021] [Indexed: 01/19/2023]
Abstract
OBJECTIVE To analyse the associations between the widths and forms of dental arches, malocclusions and crowding in middle-aged adult population. MATERIALS AND METHODS The study material is part of the Northern Finland Birth Cohort 1966 (NFBC1966); the subjects were examined at the age of 46 years. A total of 781 adults with full dentition and no orthodontic treatment history were included. Overjet, overbite, cross-bite and scissor bite were examined during clinical examination. The widths and forms of dental arches, molar relationships and crowding were measured using three-dimensional (3D) dental models. RESULTS Dental arches were significantly larger in males than in females. Class II (CII) occlusion and increased overjet (≥6 mm) were associated with narrow maxilla (P < .001, P < .05 respectively). Subjects with lateral cross-bite had significantly narrower maxilla and wider mandible (P < .05) than subjects with normal lateral occlusion. In subjects with CII occlusion, square or tapered maxilla and tapered or ovoid mandible were significantly more frequent compared to subjects with Class I (CI) occlusion (P < .05). CII occlusion was significantly associated with crowding in the maxilla (P < .01). CONCLUSION Narrow and tapered-shaped maxilla was related to CII occlusion, which was associated with dental crowding in the maxilla. Malocclusions were more likely to be found together with other malocclusions than alone.
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Affiliation(s)
- Elisa Tervahauta
- Research Unit of Oral Health Sciences, Faculty of Medicine, Medical Research Center, Oulu University Hospital and University of Oulu, University of Oulu, Oulu, Finland
| | - Jonna Nokela
- Research Unit of Oral Health Sciences, Faculty of Medicine, University of Oulu, Oulu, Finland
| | - Ville Vuollo
- Research Unit of Oral Health Sciences, Faculty of Medicine, Medical Research Center, Oulu University Hospital and University of Oulu, University of Oulu, Oulu, Finland
| | - Pertti Pirttiniemi
- Research Unit of Oral Health Sciences, Faculty of Medicine, Medical Research Center, Oulu University Hospital and University of Oulu, University of Oulu, Oulu, Finland
| | - Anna-Sofia Silvola
- Research Unit of Oral Health Sciences, Faculty of Medicine, Medical Research Center, Oulu University Hospital and University of Oulu, University of Oulu, Oulu, Finland
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Tachi A, Tochigi K, Saze N, Arai K. Impact of the prefabricated forms of NiTi archwires on orthodontic forces delivered to the mandibular dental arch. Prog Orthod 2021; 22:41. [PMID: 34850299 PMCID: PMC8633350 DOI: 10.1186/s40510-021-00385-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 09/20/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Although preformed archwires with a variety of arch forms are currently commercially available, the effects of variation in the shape of these archwires on the orthodontic force at each tooth are not well understood. Therefore, we evaluated the forces delivered by various types of commercially available preformed nickel-titanium alloy (NiTi) archwires in a simulated mandibular dental arch. METHODS Sixty-three types of 0.019 × 0.025-inch preformed NiTi archwires from 15 manufactures were selected for analysis. The intercanine width (ICW) and intermolar width (IMW) of each archwire were measured at the mean canine and first molar depths of 30 untreated subjects with normal occlusions. Each archwire was placed in a multi-sensor measurement system simulating the mandibular dental arch of subjects with normal occlusions, and orthodontic forces in the facial-lingual direction at the central incisors, canines, and first molars were measured. Correlations between the ICW, IMW, and ICW/IMW ratio of archwires and the delivered forces were analyzed. The archwires were classified into the following four groups according to the ICW and IMW: Control group, ICW and IMW are within the means ± standard deviations of the normal ranges; Ovoid group, narrow ICW and IMW; Tapered group, narrow ICW; and Square group, narrow IMW. The forces were compared among these groups for each tooth. RESULTS Significant correlations between the measured archwire width and force to each tooth were found, except between IMW and forces at the central incisors and canines. Significant differences in the forces were found among all groups, except between the Ovoid and Tapered groups at all teeth and between the Ovoid/Tapered and Control groups at the first molar. Significantly greater orthodontic forces in the facial direction were delivered at the central incisors by the archwires in the Ovoid and Tapered groups when compared with the archwires in the other groups. CONCLUSION These findings suggest that there is a possible risk of a clinically significant level of unfavorable orthodontic force being delivered to the mandibular incisors in labial inclination when using a preformed archwire with an ICW that is narrower than the dental arch.
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Affiliation(s)
- Akihiko Tachi
- Graduate School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan
| | - Keisuke Tochigi
- Department of Orthodontics, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan
| | - Naomi Saze
- Department of Orthodontics, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan
| | - Kazuhito Arai
- Department of Orthodontics, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9- 20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan.
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Kaya Y, Tunca M, Keskin S. Comparison of Two Retention Appliances with Respect to Clinical Effectiveness. Turk J Orthod 2019; 32:72-78. [PMID: 31294409 PMCID: PMC6605886 DOI: 10.5152/turkjorthod.2019.18045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 09/26/2018] [Indexed: 01/28/2023]
Abstract
OBJECTIVE The aim of this study was to compare the clinical effectiveness of Essix and Hawley retainers during the retention period. METHODS A total of 30 subjects whose fixed orthodontic treatment results were evaluated according to the American Board of Orthodontics Phase III Objective Grading system were included in this study. After the removal of orthodontic attachments, the study participants were equally divided into two retention protocols: upper-lower Essix and upper-lower Hawley. The subjects were instructed to wear their retainers full time for 6 months, except during meals, and during nights only for 6 months. The clinical effectiveness of the retainers was evaluated according to the overjet, overbite, maxillary, and mandibular intercanine widths, intermolar widths, arch lengths, irregularity indexes, and lateral cephalometric measurements. All dental model and lateral cephalometric measurements were performed by the same investigator during three periods: pre-treatment, post-treatment, and post-retention. RESULTS The overjet, overbite, maxillary, and mandibular intercanine widths; intermolar widths; and arch lengths and lateral cephalometric measurements were not statistically significantly different between the groups and identified time periods. Although the maxillary and mandibular irregularity indexes increased from the post-treatment to post-retention periods, the difference was not statistically significant. Pre-treatment, post-treatment, and post-retention lateral cephalometric measurements were not statistically significantly different between and within the groups. CONCLUSION According to the results of a repeated-measures analysis of variance with two factors, and although an increase was found in the maxillary and mandibular irregularity indexes, the clinical effectiveness of Essix and Hawley retainers was found to be similar during the retention period.
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Affiliation(s)
- Yeşim Kaya
- Department of Orthodontics, Yüzüncü Yıl University School of Dentistry, Van, Turkey
| | - Murat Tunca
- Department of Orthodontics, Yüzüncü Yıl University School of Dentistry, Van, Turkey
| | - Sıddık Keskin
- Department of Biostatistics, Yüzüncü Yıl University School of Dentistry, Van, Turkey
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Lagorsse A, Gebeile-Chauty S. [Does gender make a difference in orthodontics? A literature review]. Orthod Fr 2018; 89:157-168. [PMID: 30040615 DOI: 10.1051/orthodfr/2018011] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 12/12/2017] [Indexed: 11/14/2022]
Abstract
OBJECTIVES The objective of this literature review is to investigate whether the gender of patients and practitioners makes any difference to orthodontic treatment. MATERIALS AND METHODS Sixty-nine articles were selected, the vast majority of which studied patient gender. RESULTS Young females are the category of patients which most often apply for orthodontic treatment, probably because of their higher aesthetic demands, despite their objective needs being no greater. Aesthetic, skeletal and dental analyses reveal an obvious dimorphism with larger dimensions in males, especially for the nose, cheekbones, mouth and mandibular canines. Nevertheless, cephalometric angular values do not vary significantly between male and female individuals. Growth is quantitatively greater in males. It also occurs later, as does eruption and maturation of their teeth. Response to the different orthodontic / orthopedic therapies would appear not to differ according to the sex of the patient. DISCUSSION These results, however, need to be qualified according to the country concerned, the patients' life style and mind frames, as these can modify or influence the studied parameters.
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Affiliation(s)
- Arthur Lagorsse
- Département d'Orthopédie Dento-Faciale, Faculté d'Odontologie, rue Guillaume Paradin, 69372 Lyon cedex 08, France
| | - Sarah Gebeile-Chauty
- Département d'Orthopédie Dento-Faciale, Faculté d'Odontologie, rue Guillaume Paradin, 69372 Lyon cedex 08, France
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Patel D, Mehta F, Patel N, Mehta N, Trivedi I, Mehta A. Evaluation of arch width among Class I normal occlusion, Class II Division 1, Class II Division 2, and Class III malocclusion in Indian population. Contemp Clin Dent 2015; 6:S202-9. [PMID: 26604575 PMCID: PMC4632224 DOI: 10.4103/0976-237x.166842] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Objective: To test the hypothesis that there is no difference between Class I (CI) normal occlusion, Class II division 1 (CIId1) and CII division 2 (CIId2), and Class III (CIII) malocclusion with respect to arch widths, width of the maxillary and mandibular arches, gender dimorphism within groups, and gender comparisons. Materials and Methods: Samples of 40 CI subjects, 40 CIId1 subjects, 40 CIId2 subjects, and 34 CIII subjects were studied. All subjects were Indians with no history of orthodontic treatment. An analysis of variance and Duncan's test statistically compared the groups and genders. Results: CIId1 malocclusion showed the narrowest maxillary arch compared with the other types of malocclusions. CIII malocclusion showed largest mandibular arch than other types of malocclusions. Gender dimorphism is more commonly seen in CI normal occlusion than other types of malocclusions. Gender dimorphism is not observed in CIId1 group. Gender comparisons revealed arch width differences between different types of malocclusions more pronounced in males than in females. The maxillary/mandibular intermolar width difference is positive for CI normal occlusion and negative for CIId1, CIId2, and CIII malocclusions, which suggested, the presence of crossbite tendency in CII and CIII malocclusions. Conclusion: The hypothesis is rejected by the findings of this study.
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Affiliation(s)
- Dolly Patel
- Department of Orthodontics, AMC Dental College and Hospital, Ahmedabad, India
| | - Falguni Mehta
- Department of Orthodontics, Government Dental College and Hospital, Ahmedabad, India
| | | | - Nishit Mehta
- Graduate DDS Student, Herman Ostrow of Dentistry of USC, Los Angeles, California
| | | | - Apexa Mehta
- Graduate Student, School of Public Health, Rutgers University, New Jersey, USA
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Lombardo L, Setti S, Molinari C, Siciliani G. Largeurs intra-arcades : une méta-analyse. Int Orthod 2013. [DOI: 10.1016/j.ortho.2013.02.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abstract
OBJECTIVE To determine and compare the mean values of various intra-arch distances in Class I, Class II division 1 and Class II division 2 patients. MATERIALS AND METHODS The search engines PubMed, Embrace and Cochrane were employed to select articles for further study, and the sample thereby selected comprised adult subjects with full permanent dentition, without missing teeth, malformations or previous orthodontic treatment. Only subjects from articles published during the last 10 years were included in the study. RESULTS The search located a total of 628 articles regarding arch form. However, only eight articles were chosen for the study. We observed that: the distance between mandibular canines is smaller in Class I than in Class II division 1; mandibular inter-molar distance is similar in Class I and Class II division 1; maxillary inter-canine distance is similar in Class I, Class II division 2 and Class II division 1; maxillary inter-premolar width is greater in Class I than in Class II division 1; and that maxillary inter-molar width is similar in Class I and Class II division 2. CONCLUSIONS No statistically significant differences in arch width were found between the different classes analysed (there are only slightly differences between classes), except in the case of mandibular inter-canine width (L3), which was smaller in Class I than in Class II,1, and maxillary inter-premolar width (U4), which was smaller in Class II-I than in Class I.
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Mariano Pereira P, Pinhão Ferreira A, Tavares P, Braga AC. Different manifestations of Class II Division 2 incisor retroclination: a morphologic study. Am J Orthod Dentofacial Orthop 2013; 143:310-6. [PMID: 23452964 DOI: 10.1016/j.ajodo.2012.09.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2012] [Revised: 09/01/2012] [Accepted: 09/01/2012] [Indexed: 11/18/2022]
Abstract
INTRODUCTION The aims of this study were to investigate whether there is a different transverse morphologic pattern of dental arches among patients with different manifestations of Class II Division 2 incisor retroclination and to evaluate to what extent the pattern of smaller-than-average teeth in Class II Division 2 malocclusion is common to all groups studied. This information might clarify whether different Class II Division 2 phenotypes represent a single etiology or multiple etiologies. METHODS The sample comprised 108 subjects with Class II Division 2 malocclusions, divided into 2 groups according to the type of incisor retroclination: group I included 43 Class II Division 2 subjects with retroclination exclusively of the maxillary central incisors, and group II included 65 Class II Division 2 subjects with retroclination of the 4 maxillary incisors. Maxillary and mandibular intercanine and intermolar widths as well as mesiodistal crown dimensions of the 4 maxillary and mandibular incisors were determined from the patients' initial study models. Mean values of all variables were compared between the 2 groups by sex with analysis of variance. RESULTS From the comparison between these 2 groups, no statistically significant differences were found for all transverse measurements (P >0.05). For all mesiodistal measurements analyzed, statistically significant differences between the groups were only found for the mean value of both maxillary lateral incisors' mesiodistal dimensions in both sexes (P <0.05). CONCLUSIONS It is not possible to attribute a characteristic pattern of dental arch-width and incisor mesiodistal dimensions to the different manifestations of incisor retroclination in Class II Division 2 malocclusion.
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Affiliation(s)
- Pedro Mariano Pereira
- Department of Orthodontics, Egas Moniz High Institute for Health Science, Lisbon, Portugal.
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Slaj M, Spalj S, Jelusic D, Slaj M. Discriminant factor analysis of dental arch dimensions with 3-dimensional virtual models. Am J Orthod Dentofacial Orthop 2011; 140:680-7. [DOI: 10.1016/j.ajodo.2010.12.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2010] [Revised: 12/01/2010] [Accepted: 12/01/2010] [Indexed: 11/29/2022]
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Slaj M, Spalj S, Pavlin D, Illes D, Slaj M. Dental archforms in dentoalveolar Class I, II and III. Angle Orthod 2010; 80:919-924. [PMID: 20578864 PMCID: PMC8939017 DOI: 10.2319/112609-672.1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2009] [Accepted: 02/01/2010] [Indexed: 09/12/2023] Open
Abstract
OBJECTIVE To test the hypothesis that no differences exist in dental arch dimensions between dentoalveolar Classes I, II, and III, and between male and female subjects, as measured on virtual three-dimensional (3D) models. MATERIALS AND METHODS Samples included randomly selected plaster dental casts of 137 white patients (43 Class I, 50 Class II, and 44 Class III) from the Department of Orthodontics, School of Dental Medicine, University of Zagreb, Croatia. Dental models were scanned and digitized using ATOS II SO ("Small Objects") scanning technology (GOM mbH, Braunschweig, Germany). Eight linear and two proportional measurements were calculated for both upper and lower dental arches. RESULTS In men, a significant difference in the upper dental arch was present in the incisor region, and in the lower dental arch, differences were found in intercanine and intermolar widths (P < .05). Significant differences were noted between male groups in the upper molar depth dimension (P = .022) and in the lower molar and canine depth dimensions (P < .05). Class III males had the greatest lower molar and canine width/depth ratios and the smallest lower canine depth/molar depth ratio. Class III women had wider and shorter mandibular arches when compared with Class I and Class II females. CONCLUSION The hypothesis was rejected. The dimensions of the dental arches are related to gender and to dentoalveolar class. Class I and II subjects have similar dimensions of maxillary dental arch, but Class II subjects have a transverse deficit in the mandible. In Class III subjects, the maxillary dental arch is insufficient in transverse and sagittal dimensions, and the mandibular arch dominates in the transverse but not in the sagittal dimension.
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Affiliation(s)
- Martina Slaj
- Department of Orthodontics, School of Dental Medicine, University of Zagreb, Zagreb, Croatia.
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Arch-width and perimeter changes in patients with borderline Class I malocclusion treated with extractions or without extractions with air-rotor stripping. Am J Orthod Dentofacial Orthop 2010; 137:734.e1-7; discussion 734-5. [DOI: 10.1016/j.ajodo.2009.12.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2009] [Revised: 12/01/2009] [Accepted: 12/01/2009] [Indexed: 11/19/2022]
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Commercially available archwire forms compared with normal dental arch forms in a Japanese population. Am J Orthod Dentofacial Orthop 2010; 137:520-7. [DOI: 10.1016/j.ajodo.2008.04.025] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2007] [Revised: 04/01/2008] [Accepted: 04/01/2008] [Indexed: 11/24/2022]
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Janson G, Oltramari-Navarro PVP, de Oliveira RBS, Quaglio CL, Sales-Peres SHDC, Tompson B. Tooth-wear patterns in subjects with Class II Division 1 malocclusion and normal occlusion. Am J Orthod Dentofacial Orthop 2010; 137:14.e1-7; discussion 14-5. [PMID: 20122423 DOI: 10.1016/j.ajodo.2009.08.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2009] [Revised: 08/01/2009] [Accepted: 08/01/2009] [Indexed: 11/19/2022]
Abstract
INTRODUCTION The aim of this study was to investigate the prevalence of tooth wear in adolescents with Class II malocclusion, compared with those with normal occlusion. METHODS The sample consisted of dental casts obtained from 310 subjects, divided into 3 groups: group 1, 110 subjects with normal occlusion (mean age, 13.51 years); group 2, 100 complete Class II Division 1 patients (mean age, 13.44 years); and group 3, 100 half-cusp Class II Division 1 patients (mean age, 13.17 years). Dental wear was assessed by using a modified version of the tooth-wear index. The 3 groups were compared by means of the Kruskal-Wallis and Dunn tests, considering the frequency and the severity of wear on each surface of each group of teeth. The level of statistical significance was set at 5%. RESULTS The normal occlusion group had statistically greater tooth wear on the palatal surfaces of the maxillary central incisors and the incisal surfaces of the maxillary canines than the corresponding surfaces in both Class II malocclusion groups. The complete and half-cusp Class II Division 1 malocclusion groups had statistically greater tooth wear on the occlusal surfaces of the maxillary second premolar and first molar, the occlusal surfaces of the mandibular premolars, and the buccal surfaces of the mandibular posterior teeth compared with the normal occlusion group. The half-cusp Class II Division 1 malocclusion group had significantly greater tooth wear on the incisal surfaces of the mandibular incisors compared with the complete Class II Division 1 malocclusion group. CONCLUSIONS Subjects with normal occlusion and complete or half-cusp Class II Division 1 malocclusions have different tooth-wear patterns. Tooth wear on the malocclusion subjects should not be considered pathologic but rather consequent to the different interocclusal tooth arrangement.
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Affiliation(s)
- Guilherme Janson
- Department of Orthodontics, Bauru Dental School, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru, São Paulo, 17012-901, Brazil.
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Ling JYK, Wong RWK. Dental arch widths of Southern Chinese. Angle Orthod 2009; 79:54-63. [PMID: 19123707 DOI: 10.2319/092007-452.1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2007] [Accepted: 12/01/2007] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To investigate the dental arch width of the Southern Chinese across buccal cusps, central fossae, or lingual cusps and compare these values with study findings in different populations and using different definitions. MATERIALS AND METHODS The dental arch dimensions of study casts of an unselected sample from a 12-year-old Hong Kong Oral Health Survey of 12-year-old children (n = 358; 210 boys and 148 girls) were measured. RESULTS When compared with Caucasians, the Southern Chinese were characterized by a wider dental arch width. However, variations were great. All maxillary and mandibular male arch widths were significantly larger than female arch widths, except at the incisor regions. CONCLUSION This study yielded a database about dental arch widths by which different studies on these widths can be compared.
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Kuntz TR, Staley RN, Bigelow HF, Kremenak CR, Kohout FJ, Jakobsen JR. Arch Widths in Adults with Class I Crowded and Class III Malocclusions Compared with Normal Occlusions. Angle Orthod 2008; 78:597-603. [DOI: 10.2319/0003-3219(2008)078[0597:awiawc]2.0.co;2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2005] [Accepted: 08/01/2007] [Indexed: 11/23/2022] Open
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