Applicability of the Tanaka–Johnston and Moyers mixed dentition analyses in Northeast Han Chinese

Sherpa, Jangbu; Sah, Gopal; Zeng, Rong; Wu, L P

doi:10.1179/1465313314y.0000000122

Cited by 9 publications

(5 citation statements)

References 33 publications

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“…Coefficient of determination (r 2 ) in our study ranged between 0.41 and 0.63 suggesting that 41 to 63% of the total variation in the sum of mesiodistal widths of unerupted canine and premolars (y) can be explained by the sum of mesiodistal widths of mandibular incisors (x). The r 2 values of our study were comparable to that of Nepalese Brahmins/Chhetris [18] and Hong Kong Chinese [11] but higher when compared to Han Chinese [12], Saudi Arabian [31], Senegalese [22], Thai [15] and Syrian [16] population. However, studies conducted in Turkey [30] and Uganda [24] have reported higher r 2 values than our study.…”

Section: Discussionsupporting

confidence: 75%

New regression equations for mixed dentition space analysis in Nepalese mongoloids

et al. 2018

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BackgroundMixed dentition space analysis methods using regression equations, namely, Moyers’ analysis and Tanaka-Johnston analysis are commonly used around the world. However, the applicability of these analyses among different racial groups have been questioned. The primary objective of this study was to assess the applicability of the Moyers’ and Tanaka-Johnston analyses among Nepalese Mongoloids and to develop regression equations for the same population if needed.MethodsOne hundred (50 males and 50 females) pre-treatment study models of the Nepalese Mongoloid patients undergoing orthodontic treatment were retrieved from the archives of the department of Orthodontics. The mesiodistal widths of mandibular incisors and widths of canines and premolars of all 4 quadrants were measured by a single investigator using a digital caliper to the nearest 0.01 mm. Predicted widths of canines and premolars were obtained using standard Moyers’ and Tanaka-Johnston analyses and then compared with the measured widths.ResultsThe measured widths of canines and premolars were significantly different from the predicted widths obtained from Moyers’ and Tanaka-Johnston analyses. Strong and positive correlations were found between the sum of mesiodistal widths of mandibular incisors and the sum of mesiodistal widths of canines and premolars in males (0.73 for maxillary arch and 0.68 for mandibular arch) and females (0.64 for maxillary arch and 0.79 for mandibular arch).ConclusionsThe Moyers’ and Tanaka-Johnston analyses did not accurately predict the mesiodistal width of unerupted canines and premolars for Nepalese Mongoloid population. Hence, new regression equations have been developed for this population. However, validation studies should be conducted to confirm the applicability and accuracy of these equations.Electronic supplementary materialThe online version of this article (10.1186/s12903-018-0677-1) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 75%

New regression equations for mixed dentition space analysis in Nepalese mongoloids

et al. 2018

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“…Once the prediction size of the unerupted permanent teeth is found, the most likely degree of crowding can be established 7 . Early diagnosis and interception of crowding undoubtedly aids in better treatment planning to tackle crowding and thereby the effects produced by it [8][9][10] . The severity of malocclusion in the future can be markedly decreased using timely interception.…”

Section: Introductionmentioning

confidence: 99%

Applicability of Two Non-Radiographic Mixed Dentition Analysis Methods in Orthodontic Patients

2021

PJMD

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Background: Using erupted components of a dental arch to estimate the width of the unerupted dental components are the basis of mixed dentition analysis. Non-radiographic mixed dentition analysis employs a regression equation to assess the width of the unerupted canines and premolars. In this study, we assessed the applicability of two non-radiographic methods of mixed dentition analysis in orthodontic patients. Methods: This cross-sectional research was carried out from the records of Ziauddin College of Dentistry, Department of Orthodontics, from November 2019 to March 2020. Pre-treatment dental casts of 120 subjects (60 males and 60 females) aged between 12-30 years undergoing orthodontic treatment were selected. The mesiodistal widths from the left first molar to the right first molar were measured using a digital Vernier caliper on pretreatment dental casts of both arches. Bachman’s and Tanaka-Johnston methods were applied to estimate the widths of canine and premolars. Gender dimorphism for actual and estimated values was assessed using an independent t-test and a paired t-test was applied for the comparison between the actual and estimated mesiodistal widths of canine and premolar. Results: The actual and estimated widths of canine and premolars reported 14.3±1.4 years for males and 13.4±1.2 years for females. In addition, the Bachman’s and Tanaka-Johnston method overestimated the actual widths of unerupted canine and premolar but the difference was statistically insignificant (p≥ 0.05) in both the genders. Conclusion: The two non-radiographic methods were reliable for mixed dentition analysis with minor overestimation between actual and estimated widths (ICC=0.79). This makes both the methods applicable interchangeably in regular clinical practice.

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“…This results is similar to conclusions of other studies that indicated inacuracy of moyer prediction tables for females. (32,33) Further studies are reguired to test the accuracy of prediction tables at 50 th percentile for the egyption population…”

Section: Discussionmentioning

confidence: 99%

Validity Of Moyers`s Mixed Dentition Analysis For Egyptians

Fouda,

abd-elgawad

2023

Egyptian Orthodontic Journal

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Introduction: Treatment planning is crucial for proper tooth alignment in a mixed dentition stage. An examination of the mixed dentition should be able to predict the mesiodistal widths of the unerupted permanent teeth. Overestimating of width for unerupted teeth could increase the space required and lead to unnecessary extractions. Design: Crosssectional study. Participants: This study included 307 subjects (148 males and 159 females) aged from 16 to 22 years. Material and methods: Digital Vernier calipers was used to measure Mesio-distal tooth width on study cast Measurements of the predicted width of canine and premolars according to Moyer's prediction tables were compared with the measured values on plater models. Results: No statistically significant difference in measured width of upper and lower canine and premolars (UCPM, LCPM, respectively) in male vs. female. Poor reliability (ICC<0.5) for all measures in comparison with the predicted values except for 50 th percentile for females in lower canine & premolars which was moderate (ICC =0.534). Conclusions: The Egyptian population is not consistent with Moyer's prediction tables.

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Applicability of the Tanaka–Johnston and Moyers mixed dentition analyses in Northeast Han Chinese

Abstract: Both the Tanaka-Johnston and Moyers method may not be applied universally without question. Hence, it may be safer to develop regression equations for specific populations. Validating studies must be conducted to confirm the precision of these newly developed regression equations.

Cited by 9 publications

References 33 publications

New regression equations for mixed dentition space analysis in Nepalese mongoloids

New regression equations for mixed dentition space analysis in Nepalese mongoloids

Applicability of Two Non-Radiographic Mixed Dentition Analysis Methods in Orthodontic Patients

Validity Of Moyers`s Mixed Dentition Analysis For Egyptians

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