scholarly journals New Regression Equations for Mixed Dentition Space Analysis in an Iranian Population

2013 ◽  
Vol 14 (6) ◽  
pp. 1156-1160 ◽  
Author(s):  
Mohammad Hossein Toodehzaeim ◽  
Hossein Aghili ◽  
Elham Shariatifar ◽  
Mahboobe Dehghani
Keyword(s):  
Linear Regression ◽  
Correlation Coefficients ◽  
Iranian Population ◽  
New Method ◽  
Mixed Dentition ◽  
Regression Equations ◽  
Space Analysis ◽  
Novel Approach ◽  
Mixed Dentition Analysis ◽  
Mandibular Incisors

Abstract Aims Prediction of the mesiodistal crown width of unerupted canines and premolars is an important aspect of mixed dentition analysis. The accuracy of Tanaka-Johnston equations, the most commonly method, is questionable when it is applied to different ethnic groups. In this study, we aimed to develop a new regression equation for this prediction in an Iranian population. Materials and methods The dental casts of 120 Iranian subjects with complete permanent dentition were selected. Mesiodistal crown widths of teeth were measured with digital caliper. In the first part of the study, the correlation and linear regression equations between four mandibular incisors and the canine-premolars segments of both arches were developed (modified Tanaka-Johnston equation). In the second part, as a new method, correlation and linear regression equations were developed between the sum of mandibular central incisorsmaxillary first molars and the canine-premolars segments. Results It was found that the correlation coefficients between the sum of mandibular central incisors-maxillary first molars and the maxillary and mandibular canine-premolars segments were higher (r = 0.66, 0.68 respectively) than the one between the four mandibular incisors and the canine-premolars segments (r = 0.58. 0.64). Conclusion New linear regression equations were derived. In this study, the sum of mandibular central incisors and maxillary first molars was better predictor for unerupted canines and premolars. This novel approach allows the prediction of width of unerupted canines and premolars to take place at earlier age. Clinical significance Using the new method, orthodontists could take advantage of mixed dentition analysis at earlier age. Moreover, to test the derived equations on a larger sample size and in other ethnicities is highly recommended. How to cite this article Toodehzaeim MH, Aghili H, Shariatifar E, Dehghani M. New Regression Equations for Mixed Dentition Space Analysis in an Iranian Population. J Contemp Dent Pract 2013;14(6):1156-1160.

Regression Equations for Predicting the Size of Unerupted Canines and Premolars in an Iranian Population: A Pilot Study

2010 ◽  
Vol 11 (5) ◽  
pp. 33-40 ◽  
Author(s):  
Maryam Talebi ◽  
Iman Parisay ◽  
Ali Sarraf ◽  
Fateme Mazhari
Keyword(s):  
Pilot Study ◽  
Correlation Coefficients ◽  
Iranian Population ◽  
Mixed Dentition ◽  
Regression Equations ◽  
Moderate Correlation ◽  
Cross Sectional ◽  
Significance Level ◽  
Mandibular Arch ◽  
Simplified Formula

Abstract Aim The aim of this pilot study was to evaluate equations for predicting the size of unerupted canines and premolars during the mixed dentition period in an Iranian population. Methods and Materials This cross-sectional analysis was performed on 106 subjects (52 girls, 54 boys, aged 13–15 years). Data were obtained from dental cast by making direct measurements of the maximum mesiodistal widths of all mandibular and maxillary incisors, canines, premolars, and first molars with an electronic digital sliding caliper, with an accuracy of ±0.02 mm and repeatability of ±0.01 mm. The results were statistically analyzed using Student t tests, Pearson product-moment coefficients, and ANOVA tests. Correlation coefficients (r) and error variance of estimates were determined using a significance level of p<0.05. Results No significant differences were found between the mesiodistal tooth widths of males and females in this Iranian population. The highest correlation was between the sum of the mesiodistal width of canines and premolars in the maxilla with the mesiodistal width of the mandibular first molars and maxillary central incisors (r=0.742). A moderate correlation was obtained in the mandible (r=0.665). Approximations were developed to predict the size of the unerupted canines and premolars in both jaws (in the maxilla, Y = 0.740X + 14.271, or the simplified formula, Y = 3/4X + 14; for the mandibular arch, Y = 0.658X + 16.353, or the simplified formula, Y = 2/3 X + 16). Conclusion The strongest correlation was found for the sum of the mesiodistal width of canines and premolars in the maxilla with the mesiodistal width of the mandibular first molars and maxillary central incisors in the maxillary analysis (r=0.742). A moderate correlation was found in the mandible for the sum of the mesiodistal width of canines and premolars with the mesiodistal width of the mandibular first molars and maxillary central incisors (r=0.665). Clinical Significance The simplified equations proposed for the maxillary arch (Y = 3/4 X + 14) and for the mandibular arch (Y = 2/3 X + 16) offer an easy and practical way to predict the size of unerupted canines and premolars in the maxillary and mandibular arches of Iranian children. Citation Talebi M, Parisay I, Sarraf A, Mazhari F. Regression equations for predicting the size of unerupted canines and premolars in an Iranian population: A pilot study. J Contemp Dent Pract [Internet], 2010 October; 11(5):033-040. Available from http://www.thejcdp.com/journal/view/ volume11-issue5-talebi

scholarly journals TANAKA AND JOHNSTON'S MIXED DENTITION VALIDITY: AN ANALYSIS AMONG YEMENI ADULTS IN SANA'A CITY

2022 ◽  
Author(s):  
Waleed Abdualaziz Mohammad Dahag ◽  
Abdulwahab Ismail Mohamed Al-Kholani ◽  
Taghreed Ahmed M Al-Kibsi ◽  
Hussein Shoga Al-Deen ◽  
Hassan Abdulwahab Al-Shamahy ◽  
...  
Keyword(s):  
Peer Review ◽  
School Children ◽  
Correlation Coefficients ◽  
T Test ◽  
Mixed Dentition ◽  
Primary School Children ◽  
Regression Equations ◽  
Chi Square ◽  
Anterior Teeth ◽  
Tooth Width

Introduction and objective: Mixed dentition space analysis methods via Tanaka-Johnston analysis are regularly used all over the world. Conversely, the appropriate of this analysis between different ethnic groups is dubious. The study aimed to test the appropriate of the Tanaka-Johnston analysis for Yemeni adults and to arise regression equations designed for Yemen population if needed.  Methods: The study included two hundred and twenty-seven (106 males and 121 females) Yemenis from Sana'a University, University of Science and Technology, and Al-Rehab Private Clinic. The mesiodistal widths of the four permanent lower canines, incisors, and premolars for the entire quadrants were determined with a digital caliper to the nearest 0.01 mm. To compare average presentation values ​​derived from this study with values ​​derived using Tanaka-Johnston equations, Student's paired t-test was used, as well as the chi-square (χ2) test used for appropriateness of fit. Result: Gender differences were observed in the total mesiodistal width of both canines and premolars in both arches as revealed by the t-test (p < 0.001). The sum of the actual mesiodistal width of the canines and premolars was compared with the expected widths derived from the Tanaka and Johnston equation and significant differences (p<0.001) were found. Regression analysis indicated that the sum of the mesiodistal width of the permanent mandibular incisors is a good predictor of that of un-erupted canines and premolars, with correlation coefficients ranging from 0.51 to 0.61. Accordingly, two linear regression equations were developed to predict tooth width for Yemeni males and females. Conclusion: It was concluded from this study that the Tanaka-Johnston analysis did not accurately predict the mesiodistal width of the unruptured canines and premolars of the Yemeni population. Moreover, new regression equations have been developed for the research sample that can be a standard for Yemen. However, further studies must be performed to verify the applicability and accuracy of these equations.                   Peer Review History: Received: 10 November 2021; Revised: 12 December; Accepted: 29 December, Available online: 15 January 2022 Academic Editor: Dr. Asia Selman Abdullah, Pharmacy institute, University of Basrah, Iraq, [email protected] UJPR follows the most transparent and toughest ‘Advanced OPEN peer review’ system. The identity of the authors and, reviewers will be known to each other. This transparent process will help to eradicate any possible malicious/purposeful interference by any person (publishing staff, reviewer, editor, author, etc) during peer review. As a result of this unique system, all reviewers will get their due recognition and respect, once their names are published in the papers. We expect that, by publishing peer review reports with published papers, will be helpful to many authors for drafting their article according to the specifications. Auhors will remove any error of their article and they will improve their article(s) according to the previous reports displayed with published article(s). The main purpose of it is ‘to improve the quality of a candidate manuscript’. Our reviewers check the ‘strength and weakness of a manuscript honestly’. There will increase in the perfection, and transparency.  Received file:                Reviewer's Comments: Average Peer review marks at initial stage: 6.5/10 Average Peer review marks at publication stage: 7.5/10 Reviewers: Dr. A.A. Mgbahurike, University of Port Harcourt, Nigeria, [email protected] Rola Jadallah, Arab American University, Palestine, [email protected] Similar Articles: PREVALENCE AND CAUSES OF TRAUMATIC DENTAL INJURIES TO ANTERIOR TEETH AMONG PRIMARY SCHOOL CHILDREN IN SANA'A CITY, YEMEN OCCLUSAL CHARACTERISTICS OF THE PRIMARY DENTITION AMONG A SAMPLE OF YEMENI PRE-SCHOOL CHILDREN

Mixed dentition space analysis for a northern italian population: new regression equations for unerupted teeth

2011 ◽  
Vol 12 (2) ◽  
pp. 94-99 ◽  
Author(s):  
Giulio Alessandri Bonetti ◽  
Silvia Verganti ◽  
Matteo Zanarini ◽  
Stefano Bonetti ◽  
Maria R. Gatto
Keyword(s):  
Mixed Dentition ◽  
Italian Population ◽  
Regression Equations ◽  
Space Analysis ◽  
Unerupted Teeth

scholarly journals Lingual Eruption of Mandibular Permanent Incisors: A Space Correlated Phenomenon?

2009 ◽  
Vol 10 (1) ◽  
pp. 25-32 ◽  
Author(s):  
Naser Asl Aminabadi ◽  
Ramin Mostofi Zadeh Farahani ◽  
Aydin Sohrabi ◽  
Firuz Pouralibaba
Keyword(s):  
Clinical Problem ◽  
Mixed Dentition ◽  
Key Factors ◽  
Space Condition ◽  
Space Analysis ◽  
Long Term Follow Up ◽  
Wait And See ◽  
Mandibular Incisors

Abstract Aim The aim of the present study was to investigate the prevalence and distribution according to various arch length conditions of lingually erupted mandibular permanent incisors and the effect of space condition on this phenomenon with long-term follow-up of these teeth. Methods and Materials A total of 105 children aged 5-7.5 years with one or more permanent mandibular incisors erupting lingual to the corresponding primary incisors were included in the study. A space analysis was performed. The subjects were divided into six groups according to various space conditions. The subjects were followed for 2 years. Results In this study the prevalence of lingual eruption was 18.4%. Eighty-three point seven percent of the subjects had either equivalent space, mild space excess, or a space deficiency (not more than 3 mm). No relationship was found between groups and clinical outcomes (P>.05). Follow up of the main three groups (according to the space analysis results) revealed in the adequate space group 75% of the children lost their primary incisors without any intervention. Similar outcomes occurred in 85.7% and 57.14% of cases in the mild space excess and space deficiency groups, respectively. Considering the three main groups combined, equivalent space, mild space excess, and mild space deficiency, 70.45% of children lost their primary incisors without any intervention and 14.8% needed primary incisor extraction (17.4%, 14.3%, and 10.7% in each group, respectively). Conclusion There was no predisposition toward a space deficiency or excess found in these subjects so the wait-and-see policy versus early extraction can be considered for lingually erupting permanent mandibular incisors. Clinical Significance Lingual eruption of mandibular incisors is a common clinical problem in the early mixed dentition period that is a source of discomfort for parents of patients with this condition. The present study provides a unique insight into the prevalence of the problem as well as the clinical decisions such as favoring retention of primary incisors as long as possible, the extraction of these primary teeth, placement of lower lingual holding arches, or referral for comprehensive orthodontic treatment. These types of data should not be regarded as standards but as illustrative of several key factors that are still not well-understood or which are still ignored. Citation Aminabadi NA, Farahani RMZ, Sohrabi A, Pouralibaba F. Lingual Eruption of Mandibular Permanent Incisors: A Space Correlated Phenomenon? J Contemp Dent Pract 2009 January; (10)1:025-032.

scholarly journals Evaluation of the need to distinguish between white and black patients in predicting the combined mesiodistal crown width of canines and premolars

2006 ◽  
Vol 14 (4) ◽  
pp. 281-285
Author(s):  
Cabral Etenildo Dantas ◽  
Joanna Martins Novais Barbosa ◽  
Ludmila Galindo França de Oliveira
Keyword(s):  
Mixed Dentition ◽  
Regression Equations ◽  
Large Sample ◽  
Dental Clinics ◽  
Crown Width ◽  
Black Patients ◽  
Mandibular Incisors ◽  
Dental Casts ◽  
White Patients

The aim of the present study was to evaluate the need to distinguish between white and black patients when predicting the combined mesiodistal crown width of canines and premolars in Recife. A sample of 120 dental casts (60 from black and 60 from white patients) was selected from the archives of dental clinics in Recife. The mesiodistal crown width of the maxillary and mandibular canines and premolars and of the mandibular incisors was measured in these casts using a caliper with an accuracy of 0.02mm. The combined mesiodistal crown width of these teeth in the black patients was compared with that found in the white patients, and also with the estimated values obtained by regression equations based on the sample of white patients and on a large sample of a population from the same city. The study demonstrated that there were no significant differences between whites and blacks in the combined mesiodistal crown width of any of the three analyzed teeth groups and also revealed that such equations were statistically accurate in estimating the mesiodistal crown width of canines and premolars in blacks. It was concluded that there is no need for specific tables or equations regarding the patient's race in the analysis of mixed dentition in Recife.

scholarly journals New regression equations for mixed dentition space analysis in Nepalese mongoloids

2018 ◽  
Vol 18 (1) ◽  
Author(s):  
Jamal Giri ◽  
Prabhat Ranjan Pokharel ◽  
Rajesh Gyawali ◽  
Jigyasha Timsina ◽  
Kashmira Pokhrel
Keyword(s):  
Mixed Dentition ◽  
Regression Equations ◽  
Space Analysis

scholarly journals Analysis of quality and prediction of external and internal egg traits in Mexican native turkey hens

2020 ◽  
pp. 647
Author(s):  
Rodrigo Portillo- Salgado ◽  
Benigno Ruiz- Sesma ◽  
Paula Mendoza- Nazar ◽  
José Guadalupe Herrera- Haro ◽  
Jaime Bautista- Ortega ◽  
...  
Keyword(s):  
Linear Regression ◽  
Surface Area ◽  
Egg Quality ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Internal Quality ◽  
Unit Surface Area ◽  
Regression Equations ◽  
Quality Traits ◽  
Shell Weight

This study aimed to evaluate external and internal quality traits and determine prediction equations for some of these traits in eggs of Mexican native turkey hens. A total of 72 eggs from native turkey hens in the laying stage raised in rural municipality of Villaflores, Chiapas were measured. The external traits evaluated were: egg weight (EW), polar diameter (PD), equatorial diameter (ED), egg shape index (SI), shell weight (SW), shell percentage (SP), egg surface area (ESA) and shell weight per unit surface area (SSA). The internal traits were: albumen height (AH), yolk height (YH), albumen weight (AW), yolk weight (YW), Haugh units (HU), albumen percentage (AP), yolk percentage (YP) and yolk color (YC). The data were analyzed with descriptive statistics and Pearson correlation coefficients (r) and linear regression using the SAS program, ver. 9.4. The values obtained for the external egg quality traits showed greater variability. Pearson's correlation coefficients between external and internal traits were positive and moderately significant (P <0.05), as well as highly significant (P <0.0001), and ranged from r = 0.31 (EW vs PD) to r = 0.99 (ED vs ESA). All linear regression equations to predict EW, SW, AW and YW were found to be significant (<.0001). The best predictors of EW were PD, SI, SW and ESA (R2 = 76%). SW and YW traits can be adequately predicted using the EW and SI values together (R2 = 59% and R2 = 74%, respectively), while the AW can be predicted from the EW (R2 = 33%). Based on the results obtained, it is suggested to implement selection programs to improve the quality parameters of the native turkey hen egg in Mexico.

scholarly journals Predicting the Mesiodistal Crown Dimensions of the Permanent First Molars from the Deciduous Second Molars

2021 ◽  
Vol 2021 ◽  
pp. 1-5
Author(s):  
Dunia Ahmed Al-Dulaimy ◽  
Mohammed Nahidh ◽  
Mohammed Rafid A. Al-Khannaq
Keyword(s):  
Gender Differences ◽  
High Precision ◽  
New Method ◽  
Mixed Dentition ◽  
Regression Equations ◽  
And Gender ◽  
Crown Dimensions

Background. This study aims to formulate regression equations that predict the mesiodistal crown widths of the permanent first molars utilizing the mesiodistal crown widths of the deciduous second molars. Methods. Fifty pairs of study models belonging to 50 Iraqi children aged eight to nine years with sound mixed dentition were used to measure the mesiodistal crown widths of the permanent first molars and deciduous second molars using a pointed digital sliding caliper with 0.01 mm sensitivity. Side and gender differences were assessed, and the correlations between these teeth were obtained to develop the regression equations. Results. The results revealed no significant side differences, so the samples were merged and analyzed for gender differences, which were found to be significant in all examined teeth except the mandibular permanent first molar. Direct, moderate, and highly significant correlations between the mesiodistal crown widths of the permanent first molars and deciduous second molars were found, which led to the development of regression equations. After applying these equations, the resultant predicted widths were compared to the actual widths, and the results revealed nonsignificant method differences. Conclusions. A new method was developed to predict the widths of permanent first molars from the adjacent primary second molars with high precision.

Predicting the size of unerupted canines and premolars of the maxillary and mandibular quadrants in an Iranian population

2007 ◽  
Vol 32 (1) ◽  
pp. 43-47 ◽  
Author(s):  
Hosseinzadeh Tahere ◽  
Shalchi. Majid ◽  
Mohandes. Fateme ◽  
Kharazi fard ◽  
Mohammad Javad
Keyword(s):  
Good Accuracy ◽  
Correlation Coefficients ◽  
Iranian Population ◽  
Regression Equations ◽  
Probability Level ◽  
Inclusion Criteria ◽  
Male Subjects ◽  
Digital Caliper ◽  
Lower Arch ◽  
Actual Size

The aim of this investigation was to examine the accuracy of Moyers probability tables and the Tanaka and Johnston prediction equations in predicting the size of unerupted canines and premolars of the maxillary and mandibular quadrants in an Iranian population and to derive a standard formula for it. Methods. Out of a sample of 280 subjects, 50 (25 males and 25 females) were selected by specific inclusion criteria. An electronic digital caliper was used to read the nearest 0.01mm. The teeth measurements derived were compared with those predicted from Tanaka Johnston equations and Moyers probability tables and then standard regression were developed. Results. Tanaka and Johnston regression equations overestimate the mesiodistal width of permanent canines and premolars. There were no statistically significant differences between actual mesiodistal width of canines and premolars and the predicted width from Moyers charts at 65% for the lower and upper arches in male subjects and for the lower arch in females but none of the probabilities has good accuracy for the upper arch in females. For the newly developed regression equations, the correlation coefficients between the sum of the mandibular incisors and the sum of the canine and premolars were 0.709 (for lower) and 0.539 (for upper) in subjects. Conclusions: Tanaka and Johnston overestimate the actual size for Iranian teeth widths. Moyers method can be used at 65% probability level for male subjects and at the 75% and 85% level for upper arch and the 50%and 65% level for lower arch in female subjects.

Sign in / Sign up

Export Citation Format

Share Document