Comparison of Bolton ratio in normal occlusion and different malocclusion groups in Iranian population

Mollabashi, Vahid; Soltani, Mohammad Karim; Moslemian, Naeime; Akhlaghian, Marzieh; Akbarzadeh, Mahdi; Samavat, Hesamoddin; Abolvardi, Masoud

doi:10.1016/j.ortho.2019.01.005

Cited by 14 publications

(20 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In our study, no significant differences were found with respect to gender for the anterior ratio and overall ratio. This is in agreement with majority of previously reported findings [12, 22–24], but contrasting findings have been reported by other studies [8, 25]. In the Nepalese subjects, Hong et al have reported no significant difference between male and female Class I samples for either anterior ratio or overall ratio [26]; however, Jaiswal et al have reported significant difference between male and female subjects for anterior ratio only [27].…”

Section: Discussionsupporting

confidence: 88%

Analysis of Interarch Tooth Size Relationship in Nepalese Subjects with Normal Occlusion and Malocclusions

Mishra

Kafle

Gupta³

2019

International Journal of Dentistry

View full text Add to dashboard Cite

Introduction A proportional relationship between the maxillary and mandibular teeth size is required for achieving good finish with proper overjet and overbite postorthodontic treatment. The aims and objectives of this study were to determine the anterior and overall Bolton's ratio in Nepalese population, to compare Bolton's ratio between subjects with normal occlusion, Class I malocclusion, and Class II malocclusion, to compare these results with Bolton's norm, and to determine the frequency of clinically significant (beyond 2 SD) tooth size discrepancy compared to Bolton's norm. Materials and Methods The study models of the subjects with normal occlusion and Angle's Class I malocclusion and Class II malocclusion and fulfilling the inclusion criteria were retrieved from department archives. An electronic digital caliper was used to measure mesiodistal tooth size of the maxillary and mandibular teeth anterior to the second molars. The study sample of 120 study models consisted of the normal occlusion group (n = 31), Class I malocclusion group (n = 47), and Class II malocclusion group (n = 42). These measurements were then used to obtain Bolton's ratio in three groups of subjects. Bolton's ratio of study groups was compared with each other and with Bolton's original ratio. Results The differences in tooth size ratio of the study groups were not significant statistically, when the groups were compared on the basis of malocclusion or gender. Statistically significant differences were exclusively observed between the study groups and Bolton's original sample for the anterior ratio. The frequency of the clinically significant tooth size ratio discrepancy was lower for the overall ratio (9.1%) compared to the anterior ratio (22.5%). Conclusions Bolton's analysis on the Nepalese population sample shows that there was no significant difference observed on the anterior and overall tooth size ratios when these were compared based on Angle's malocclusion classes or gender. The clinically significant anterior tooth size discrepancy was more prevalent than that of the overall ratio.

show abstract

Section: Discussionsupporting

confidence: 88%

Analysis of Interarch Tooth Size Relationship in Nepalese Subjects with Normal Occlusion and Malocclusions

Mishra

Kafle

Gupta³

2019

International Journal of Dentistry

View full text Add to dashboard Cite

show abstract

“…Several studies have reported the cephalometric and tooth-size features of individuals of Middle Eastern ethnicity ( Al Jundi & Riba, 2014 ; Ali, El-Shorbagy & Elliathy, 2016 ; Fouda, Hafez & Al-Awdi, 2017 ; Mollabashi et al, 2019 ; ElAbbasy, 2019 ). Although Syrians belong to the Middle Eastern ethnic group, limited data are available pertaining to the craniofacial characteristics of adolescents of Syrian nationality.…”

Section: Discussionmentioning

confidence: 99%

“…Former Middle Eastern studies have indicated that tooth-size disharmonies exist among different groups of malocclusion ( Fattahi, Pakshir & Hedayati, 2006 ; Mollabashi et al, 2019 ). In accordance with our results on tooth-size ratios (CIs of anterior ratio and overall ratio in Table 1 vs. their corresponding values in Table S2 ), some Middle Eastern studies did not find differences in overall ratios between Class II-1 subjects and the normative data ( Asiry & Hashim, 2012 ), whereas other Middle Eastern studies described an overall ratio for Class II-1 subjects that was smaller ( Mollabashi et al, 2019 ; Shamaa, 2019 ) or larger ( Uysal et al, 2005 ) compared to that of subjects with normal occlusion. Similarly, variability can be found in the Middle Eastern literature regarding the anterior ratio, whereas a smaller ratio ( Fattahi, Pakshir & Hedayati, 2006 ) or no differences were detected ( Uysal et al, 2005 ; Asiry & Hashim, 2012 ) (CIs of anterior ratio and overall ratio in Table 1 vs. their corresponding values in Table S5 ).…”

Section: Discussionmentioning

confidence: 99%

“…Likewise, inconsistent results have been reported regarding the relationship between Class II-1 malocclusion and upper-airway dimensions, where some investigators suggested Class II-1 malocclusion may have an influence on the upper-airway dimensions ( Mergen & Jacobs, 1970 ; Silva et al, 2015 ; Soni et al, 2015 ) while other authors did not find a significant correlation between the two ( Sosa, Graber & Muller, 1982 ; Ceylan & Oktay, 1995 ; Bollhalder et al, 2013 ). Further, a number of tooth-size studies have investigated Class II-1 malocclusion; their results were also contradictory, with some reporting significant differences in tooth-size ratios between Class II-1 malocclusion and Class I malocclusion or normal occlusion ( Fattahi, Pakshir & Hedayati, 2006 ; Wędrychowska-Szulc, Janiszewska-Olszowska & Stepień, 2010 ; Mollabashi et al, 2019 ) and others indicating no significant differences in this regard ( Crosby & Alexander, 1989 ; Oktay & Ulukaya, 2010 ; Machado et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Craniofacial characteristics of Syrian adolescents with Class II division 1 malocclusion: a retrospective study

Ayoubi

Torre²,

Madléna

2020

PeerJ

View full text Add to dashboard Cite

Background Malocclusion characteristics vary across different ethnic groups and populations. Limited data are available regarding the characteristics of Syrian adolescents with Class II division 1 (Class II-1) malocclusion, and the recent inflow of Syrian refugees and immigrants into Europe and many areas worldwide demonstrate the need for updated studies to discover the craniofacial characteristics of these new immigrants. Objectives The present compound cephalometric and tooth-size study sought to assess the dentofacial morphology, upper-airway dimensions, and tooth-size characteristics of Syrian adolescents with Class II-1 malocclusion and compare the results with established Syrian population norms. Materials and Methods The study sample consisted of 43 Syrian patients including 24 females and 19 males with Class II-1 malocclusion (age: 14.3 (±1.5) years, mean (±SD)). Cephalometric radiographs and orthodontic casts were analyzed using special orthodontic software (OnyxCeph3™) and a universal digital caliper, respectively. Statistics were calculated using the SPSS software. Results In Syrian adolescents with Class II-1 malocclusion, the position of the mandible relative to the nasion perpendicular (mean (95% confidence interval)) was −11.01 (−12.45, −9.57) mm. Facial axis angle showed a negative value: −6.25 (−7.65, −4.85) degrees. An obtuse nasolabial angle was observed: 104.05 (101.77, 106.33) degrees. The average width of the upper pharynx was 11.50 (10.53, 12.47) mm; however, there was no prevalence of an upper-pharyngeal width of 5 mm or less. The average value of the anterior tooth-size ratio was 80.69 (79.85, 81.53) percent. In total, 39.5% of the investigated subjects had anterior ratios outside two standard deviations from Bolton’s norm, while 25.6% of the investigated subjects had anterior ratios outside two standard deviations from Syrian population norm. Conclusions In this study, the inter-maxillary discrepancy of Class II-1 Syrian adolescents was a consequence of their hyperdivergent facial pattern. The observed small pharyngeal widths were not clinically significant, while the anterior tooth-size discrepancy might be clinically relevant.

show abstract

Digital evaluation of Bolton's tooth size discrepancies among different malocclusions categories of Egyptian adolescent orthodontic population: A retrospective study

Hussein

Mohamed²,

El-Awady³

et al. 2022

International Orthodontics

View full text Add to dashboard Cite

Comparison of Bolton ratio in normal occlusion and different malocclusion groups in Iranian population

Cited by 14 publications

References 22 publications

Analysis of Interarch Tooth Size Relationship in Nepalese Subjects with Normal Occlusion and Malocclusions

Analysis of Interarch Tooth Size Relationship in Nepalese Subjects with Normal Occlusion and Malocclusions

Craniofacial characteristics of Syrian adolescents with Class II division 1 malocclusion: a retrospective study

Digital evaluation of Bolton's tooth size discrepancies among different malocclusions categories of Egyptian adolescent orthodontic population: A retrospective study

Contact Info

Product

Resources

About