Relations between the mesiodistal crown diameters of the primary and permanent teeth of Hong Kong Chinese

Yuen, Keith Kwok-wah; Tang, Endarra L. K.; So, Lisa L. Y.

doi:10.1016/0003-9969(95)00107-7

Cited by 24 publications

(14 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Taiwan Aborigines that include Ami, Atayal and Yami tribes (Liu, 1977;Manabe et al , 1996) had larger teeth than the Taiwan Chinese of the present study, but Liao (1984) reported a similar large size for Taiwan Chinese. Hong Kong Chinese (Yuen et aL , 1996) have similar tooth sizes to the Taiwan Chinese of the present study. The discrepancy between Liao's data and ours may relate to the difference of materials including the effect of gene flow from Taiwan Aborigines to Taiwan Chinese.…”

Section: Discussionsupporting

confidence: 69%

Sexual Dimorphism in the Tooth Crown Dimensions of the Second Deciduous and First Permanent Molars of Taiwan Chinese

Kondo

Funatsu

Wakatsuki

et al. 1998

Okajimas Folia Anatomica Japonica

View full text Add to dashboard Cite

Summary: Sexual dimorphism in the crown components in the second deciduous molar (dm2) and the first permanent molar (M1) of the dental casts taken from Chinese living in Kaohsiung (Taiwan) was investigated. Mesiodistal and buccolingual crown diameters, and 4 main-cusp sizes in the maxillary molars and mesiodistal diameters of the trigonid and talonid in the mandibular molars were measured using a digital caliper (0.01 mm). Percentage sexual differences were calculated. With the exception of trigonid mesiodistal diameters, the mean values of males were larger than females. In both of dm2 and M1 the mean values of the trigonid mesiodistal diameters were slightly larger in females than in males, but the differences were not significant. Percentage sexual dimorphism was smaller in the mesiodistal diameters than in the buccolingual in both dm2 and M1. The crown components showed larger sexual difference in dm2 than in M1, while in the maxilla the external crown size showed larger sexual difference in M1 than in dm2. The buccal cusps showed larger sexual difference than the lingual in the maxillary molars and the talonid showed larger sexual difference than the trigonid in the mandibular. Sexual dimorphism of dm2 and M1 in their crown components displayed similar pattern, although the different degree was noted. This result is thought to relate to the fact these molars belong to the first dentition embryologically.The second deciduous molar (dm2) morphologically resembles the first permanent molar (M1). These two molars adjoin among the molar series, and they belong to the first dentition embryologically. They have similar crown shapes and occlusal groove-patterns, but different sizes. Although there are many similarities between them, they are not identical.The maxillary molar teeth have 4 main-cusps; paracone, metacone, protocone and hypocone. The mandibular molar teeth consist of the mesial trigonid and the distal talonid. Thus the maxillary and mandibular molar tooth crown consists of several crown components, and the crown shape can be expressed by these crown components (Yamada et al

show abstract

Section: Discussionsupporting

confidence: 69%

Sexual Dimorphism in the Tooth Crown Dimensions of the Second Deciduous and First Permanent Molars of Taiwan Chinese

Kondo

Funatsu

Wakatsuki

et al. 1998

Okajimas Folia Anatomica Japonica

View full text Add to dashboard Cite

show abstract

“…This was consistent with the results reported by Al-Bitar,[21] Jensen,[17] Bishara et al .,[20] Hattab et al .,[22] and Yeun et al . [23] Thus, this necessitates the need for separate prediction formula and probability tables for males and females.…”

Section: Discussionmentioning

confidence: 99%

Mixed dentition analysis - Applicability of two non-radiographic methods for Chennai school children

Kommineni¹,

Reddy²,

Chandra³

et al. 2014

J Int Soc Prevent Communit Dent

View full text Add to dashboard Cite

Aim:To evaluate the applicability of the Tanaka and Johnston (1974) and Moyers (1988) methods in predicting the size of permanent canines and premolars in Chennai school children.Materials and Methods:470 sets (127 female and 343 male) of cast models were included in the sample. Mesio-distal (m-d) widths of all teeth from left to right first molars were measured and compared with the predicted values derived from Tanaka and Johnston and Moyers methods.Results:There was significant bilateral symmetry and sexual dimorphism in teeth sizes seen in both the sexes. Sum of the m-d diameter of permanent mandibular incisors can be used reliably to predict the sum of m-d diameters of unerupted canines and premolars.Conclusions:Tanaka and Johnston's method cannot accurately predict the m-d widths. Moyers’ prediction tables can be used to estimate the m-d widths of unerupted canines and premolars closer to 50% probability level.

show abstract

“…In this context, the maximum root radius is an important dimension, since curved instruments such as curettes or files should be aligned as well as possible to the spherical root surface [10]. Surprisingly, there is a large body of data on tooth morphology concerning crown diameters, furcation anatomy, and root length [2,3,4,6,11,12,14,17,18,19] but a lack of data, e.g., on root radii, that are relevant to the design of periodontal instruments. Detailed information on that specific aspect of root geometry may allow instruments to be designed that are well adapted to the surface to be treated.…”

Section: Introductionmentioning

confidence: 99%

Assessment of root curvature and distance using computed tomography

Petersilka

Draenert²,

Jervøe‐Storm

et al. 2002

Clinical Oral Investigations

View full text Add to dashboard Cite

The safety and efficacy of subgingival root surface instrumentation may be enhanced by optimized adaptation between instrument and treated surface. Thus, detailed knowledge of root geometry may allow advances in instrument design. The aim of this study was therefore to measure root radii of various tooth types as well as distances between tooth roots using computed tomography. Two hundred sixteen teeth in eight patients were studied, with cross sections of teeth at the level of the cemento-enamel junction (CEJ) being regarded as ellipses. The maximum radii of ellipses were calculated and averaged for each tooth surface within various tooth groups. In addition, the spacing between roots at CEJ level and 5 mm below the CEJ was measured. Mean radii varied from 1.09+/-0.50 mm (lower incisor, lingual) to 13.7+/-0.96 mm (upper molar, mesial). Radii of 1 mm to 6 mm were most frequently found at buccal, palatal, and lingual surfaces, whereas the majority of radii were between 2 mm and 11 mm at mesial and distal sites. Root distance varied between 1.04+/-0.49 mm (lower incisors, CEJ level) and 2.81+/-1.70 mm (lower molars, 5 mm below CEJ). The curvature of an instrument for root surface instrumentation should correspond to a radius of at least 11 mm to achieve maximum adaptation to the treated surface, and the width of the working end should be less than 1 mm to allow sufficient interdental instrumentation.

show abstract

Relations between the mesiodistal crown diameters of the primary and permanent teeth of Hong Kong Chinese

Cited by 24 publications

References 17 publications

Sexual Dimorphism in the Tooth Crown Dimensions of the Second Deciduous and First Permanent Molars of Taiwan Chinese

Sexual Dimorphism in the Tooth Crown Dimensions of the Second Deciduous and First Permanent Molars of Taiwan Chinese

Mixed dentition analysis - Applicability of two non-radiographic methods for Chennai school children

Assessment of root curvature and distance using computed tomography

Contact Info

Product

Resources

About