Mesiodistal tooth width and tooth size discrepancies of Yemeni Arabians: A pilot study

Al-Gunaid, Talat Hasan; Yamaki, Masaki; Saito, Isao

doi:10.4103/2278-0203.99760

Cited by 25 publications

(28 citation statements)

References 31 publications

(60 reference statements)

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“…According to the present study, no statistically significant differences were found between genders in anterior or overall Bolton’s ratio for each malocclusion group. These findings are in the line with previous researches on several other populations ( 13 – 15 , 19 – 24 ). On the other hand, some other investigations showed statistically significant differences between genders in the overall ratio for the malocclusion groups ( 23 , 25 ) and in the anterior ratio ( 23 , 26 ).…”

Section: Discussionsupporting

confidence: 93%

“…Besides that, sexual dimorphism of the teeth dimension is related to humanoid sex genes and hormones and is influenced by their imbalance ( 7 – 9 ). Furthermore, teeth size have been studied worldwide in order to compare various populations that have specific characteristics and to determine the patterns of variability between different teeth, associations within and between dental arches ( 1 , 2 , 5 , 6 , 9 – 15 ).…”

Section: Introductionmentioning

confidence: 99%

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Bolton ratios in Portuguese subjects among different malocclusion groups

Machado¹,

Pereira

Vasques

et al. 2018

J Clin Exp Dent

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BackgroundSeveral methods have been described to estimate inter-arch tooth size relationship, such as Bolton’s ratios. The aims of this study were to verify the validity of Bolton indexes in a sample of untreated Portuguese subjects based on Angle classification and to evaluate the gender difference.Material and Methods168 pre-treatment dental casts of orthodontics Portuguese subjects (59 males and 109 females) with different occlusions were used, which were selected randomly from 541 consecutively treated orthodontic patients. The mesiodistal widths from first molar to first molar were measured on each pre-treatment cast to the nearest 0.01 mm using digital caliper, and Bolton’s anterior and overall ratios were calculated. Descriptive statistics as mean, standard deviation and range were calculated. Moreover, the results were compared to Bolton’s ratios and differences based on gender and occlusion groups were evaluated by statistical inference methods.ResultsThe results reveal that the mean values, standard deviation and range were larger than Bolton’s in normal occlusion group (78.3±3.5% in anterior ratio and 92.1±2.2% in overall ratio) and there were no differences between genders (p >0.05). Class I (anterior and overall ratios, p=0.001 and p<0.001, respectively), Class II/2 (anterior ratio, p=0.032) and Class III (overall ratio, p=0.041) were significantly different from Bolton’s reference data.ConclusionsThe results showed no differences between gender and no difference between normal occlusion and malocclusion groups. Moreover, in normal occlusion group, the anterior and overall tooth size ratios was equivalent to the original Bolton’s ratios, although the mean and standard deviation were large. Key words:Bolton anterior and overall ratios, normal occlusion, malocclusion, portuguese population.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Bolton ratios in Portuguese subjects among different malocclusion groups

Machado¹,

Pereira

Vasques

et al. 2018

J Clin Exp Dent

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“…Moreover, tooth measurement was conducted on study models which offers a significant improvement on direct intra-oral tooth measurement and allow remeasurement when required. [3334] Racial variations in MD tooth width have been noted by previous researchers[51113243536] and therefore variations in MD tooth width are likely to be population-specific. Moreover, males are consistently found to have larger teeth than females.…”

Section: Discussionmentioning

confidence: 87%

An odontometric study of tooth size in normal, crowded and spaced dentitions

Bugaighis

Elorfi

2013

J Orthodont Sci

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Objective:To assess the mesio-distal tooth width in normal, crowded, or spaced dentitions.Materials and Methods:A sample of 192 maxillary and mandibular dental casts of Libyan subjects was selected from a larger cohort. These subjects did not present with craniofacial anomaly, hypodontia, significant attrition, caries, restorations, or history of permanent tooth extraction or orthodontic treatment. The sample was divided into normal, crowded, and spaced groups according to tooth size/arch length discrepancy. Each group included 32 upper and lower dental casts with equal numbers of males (mean (SD) age = 14.7 (1.9) years) and females (mean (SD) age = 15.7 (2.5) years). The mesiodistal (MD) tooth width, sum of the MD tooth widths mesial to the first molars (TTM), sum of the MD width of the four incisors (I), and the sum of the MD width of canine and first and second premolars (CPP) were calculated for each group. The independent Student t-test was applied sequentially to detect significant differences between paired groups. The ANOVA test was undertaken to explore significant differences between the three groups. Pearson coefficient of correlation was used to evaluate the correlation between I and the corresponding CPP in maxillary and mandibular arches.Results:MD tooth width, TTM, I, and CPP were significantly wider in the crowded compared to normal and spaced dentitions (P<0.001), except for the width of the upper left lateral incisors in both normal and crowded groups. Although there was a trend for smaller tooth widths in spaced dentitions compared to normal ones, this was only significant in the maxillary left central incisor, maxillary right and left lateral incisors, maxillary right first premolar, mandibular right lateral incisor, and mandibular right canine (P<0.05). However, the maxillary TTM, I, and CPP in the normal group were significantly greater than in the spaced group (P<0.05). Significant positive correlations existed between the mean values of I and CPP in both the maxillary and mandibular dentitions of all groups (P<0.01).Conclusions:It appears that in the studied Libyan population, the MD tooth width is a significant component of crowding/spacing.

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“…Some studies have reported differences in the dentition between past and present in Japanese populations [1][2][3]8) . Few studies have compared differences in the sizes of the deciduous teeth and dental arch between past and present in such a population, however.…”

Section: Introductionmentioning

confidence: 99%

Development of Jaw and Deciduous Teeth in Japanese Children —Comparing Size of Crown and Alveolar Area between Today and 40 Years Ago—

Makiguchi

Imai

Arakawa

et al. 2018

Bull. Tokyo Dent. Coll.

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The purpose of the present study was to investigate change in the size of the jaw and deciduous teeth in Japanese children over the past 40 years by performing measurements on plaster models of the dental arch obtained from children born between 2007 and 2009 (2000s group) and children born between 1968 and 1974 (70s) group. A total of 61 children were enrolled in the 2000s group, comprising 25 boys (average age, 4 years 5 months) and 36 girls (average age, 4 years 4 months), and 93 children in the 70s group, comprising 45 boys (4 years 6 months) and 48 girls (4 years 4 months). The mesiodistal width of the crown, dental arch width, dental arch length, dental arch height, and available arch length in these groups were measured using a 3D measurement system and the sums of the mesiodistal width of the crown and tooth size-arch length discrepancies calculated. The results of the two groups were statistically compared and the following conclusions reached: the size of deciduous teeth has not changed statistically over the last 40 years; the size of the dental arch has decreased in boys (p<0.01), while remaining approximately the same in girls; and the tooth size-arch length discrepancy has decreased, especially in boys (p<0.01). These results indicate that the interdental spaces of the deciduous dentition have decreased, increasing the risk of crowding in Japanese children.

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Mesiodistal tooth width and tooth size discrepancies of Yemeni Arabians: A pilot study

Cited by 25 publications

References 31 publications

Bolton ratios in Portuguese subjects among different malocclusion groups

Bolton ratios in Portuguese subjects among different malocclusion groups

An odontometric study of tooth size in normal, crowded and spaced dentitions

Development of Jaw and Deciduous Teeth in Japanese Children —Comparing Size of Crown and Alveolar Area between Today and 40 Years Ago—

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