Rajiv gandhi university of health sciences bangalore, karnataka annexure II proforma for registration of subjects for dissertation



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RAJIV GANDHI UNIVERSITY OF HEALTH SCIENCES BANGALORE, KARNATAKA ANNEXURE – II

PROFORMA FOR REGISTRATION OF SUBJECTS FOR DISSERTATION

1.

NAMEOF THE CANDIDATE & ADDRESS (IN BLOCK LETTERS)

DR. SAHISTHA ANJUM MOQUDDAM

POST GRADUATE STUDENT, DEPARTMENT OF ORTHODONTICS AND DENTOFACIAL ORHTOPAEDICS.

AL-BADAR RURAL DENTAL COLLEGE & HOSPITAL, GULBARGA


2

NAME OF THE INSTITUTION

AL-BADAR RURAL DENTAL COLLEGE & HOSPITAL, GULBARGA


3.

COURSE OF STUDY AND SUBJECT

MASTER OF DENTAL SURGERY IN ORTHODONTICS AND DENTOFACIAL ORTHOPAEDICS.

4.

DATE OF ADMISSION TO THE COURSE

28th MAY 2008


5.


TITLE OF THE TOPIC


EVALUATION OF INTERMAXILLARY TOOTH SIZE DISCREPANCY AND MESIODISTAL CROWN DIMENSIONS FOR GULBARGA POPULATION”



6. BRIEF RESUME OF THE INTENDED WORKS

6.1 Need for the study:-

A goal in comprehensive orthodontic treatment is to obtain optimal final occlusion, over bite and overjet. The attainability of this goal is influenced by many factors including the relationship between the total mesio-distal width of the maxillary and mandibular teeth. One among the classic works of Bolton was based on determining the ideal ratio between the maxillary and mandibular teeth material. He introduced mathematical tooth size ratios that were supposed to be helpful in order to obtain proper interarch relationship.

Many studies have been done on Bolton’s analysis for different population. It has been concluded that Bolton’s analysis has certain limitations such as-


  1. Bolton’s analysis is not statistically applicable for all the populations.

  2. Bolton’s ratio is the same irrespective of the sex, but studies have shown different values for both males and females.

The purpose of this study is to know the applicability of Bolton’s analysis for Gulbarga population.

6.2 Review of Literature

They performed Bolton’s tooth size ratio on a sample of 50 plaster models (25 males and 25 females) of Iranian-Azari population. They selected subjects with Angle’s class 1 molar and canine relationship, symmetrical arches, absence of interproximal caries with no previous orthodontic treatment and normal overjet and over bite. They used a digital boley gauge with vernier scale that provided a precision reading to the nearest 0.01mm. The assessment of the results disclosed that Bolton’s analysis can be used on Iranian-Azari population with no significant difference for male and female subjects.1

This study was performed to determine the size of individual permanent teeth, tooth size ratio for the maxillary and mandibular dentitio and sex difference for those variables in a Turkish population, and to compare with those of Bolton’s analysis. 150 Turkish subjects were selected (72 men and 78 women) of 20-35 years having class 1 occlusion, well aligned arches and a digital caliper was used to measure the casts to the nearest 0.01mm. The results revealed that the original Bolton’s data did not represent Turkish population and it is appropriate to use Turkish norms in daily orthodontic practice for Turkish population.2

This study was conducted to determine maxillary-mandibular tooth size ratio in Peruvian population. Study sample consisted of 200 children of age 12-16 years of which 100 were males and 100 were females with complete permanent dentition. Bolton’s analysis on Peruvian population showed no statistically significant difference between males and females.3

They conducted the study to evaluate Bolton’s interarch ratios across populations and genders. Data was collected from pre orthodontic casts of 180 patients including 30 males and 30 females from each of the 3 populations that is blacks, hispanics and whites. It was concluded that there were significant differences in the overall anterior and posterior interarch ratios between whites, blacks and hispanics suggesting that population specific standards are necessary for clinical assessments. There was also significant difference between males and females, Bolton’s analysis being applicable to only White females.4



This study was conducted to determine Bolton ratios in Spanish subjects. The study was done on 100 dental casts. The results concluded significant differences in Spanish values from that of standard Bolton’s values but no difference in values between males and females.5

They conducted the study to calculate anterior and overall ratios of mandible and maxillary tooth size for Syrian population and to compare with that of Bolton’s and Michigan studies. Study was conducted on 55 patients (35 males and 20 females) of 11-22 years. Among which 48 patients had already undergone orthodontic treatment. They observed that original data from Bolton showed minimally higher ranges and mean values for anterior and over all tooth ratio and the sex specific analysis demonstrated no relevant differences.6



6.3 Objectives of the study:

  1. To determine maxillary to mandibular tooth size ratio in Gulbarga population.

  2. To Determine the sexual dimorphism with respect to bolton’s ratio in Gulbarga population

  3. To compare the ethnic differences between Gulbarga population and Caucasians.

7. MATERIALS AND METHODS-

    1. Source of data-

Plaster models of 60 patients (30 male and 30 female) between

20-28 years of age selected randomly among Gulbarga population.



    1. Method of collection of data- (including sampling procedure, if any)

The primary selection criteria

  1. Subjects should have ancestors belonging to Gulbarga.

  2. Patients should be non growing adults.

  3. All teeth must be present and fully erupted from 2nd molar to 2nd molar.

  4. Absence of interproximal caries and restoration or any anomalies in the

tooth morphology

5. Subjects with no previous history of orthodontic treatment with normal

Overjet and overbite

METHOD OF STUDY-

Impression will be made of the selected subjects, orthodontic models will be prepared and study models will be prepared and analyzed for Bolton’s anterior tooth ratio and over all tooth ratios using Digital Vernier Caliper. The mesio distal width of all the teeth will be measured at the maximum mesio distal contact point.

The values obtained will be statistically analyzed for co-efficient of variation, standard deviation and mean values. This data is to be compared with standard Bolton’s values.

7.3 Does the Study require any investigations or interventions to be conducted on patients or other human or animals? If so, please describe briefly.

Not Applicable



7.4 Has ethical clearance been obtained from your institution in case of 7.3?

Not Applicable



8. LIST OF REFERENCES:





  1. Behman Mirzakouchaki, Shirin Shahrbaf, Reza Talebiya . Determining tooth size ratio in Iranian-Azari population. J Contemp Dent Pract 2007 Nov; (8)7:086-093



  1. Tancan Uysal and Zafer Sari. Intermaxillary tooth size discrepancy and mesio-distal crown dimensions for a Turkish population. Am J Orthod Dentofacial Orthop 2005; 128:226-30.



  1. Edvardo Bernabe, Paul W Major, Carlos Flores-Mir. Tooth-width ratio discrepancies in a sample of Peruvian adolescence. Am J Orthod Dentofacial Orthop 2004; 125:361-5.



  1. Stephanie S Smith, Peter H Buschang and Etsuko Watanabe. Interarch tooth size relationships of 3 populations: “Does Bolton’s analysis apply?” Am J Orthod Dentofacial Orthop 2000; 117:169-74.



  1. Pardese V , Gandia J L , Cibrian R. Do Bolton’s ratio apply to a Spanish population. Am J Orthod Dentofacial Orthop 2006 Mar; 129(3) 428-30.

6. Abduhl W Nourallah, Christian H Splieth, Christian. Schwahn, Mohammad
Khurdaji Standardizing interarch tooth size harmony in Syrian population Angle
Orthod 2005; 75:996-999.



9.

SIGNATURE OF THE

CANDIDATE




10.

REMARK OF THE GUIDE

The study is helpful in analyzing the applicability of Bolton’s tooth size ratio for Gulbarga population


11.





12.

NAME & DESIGNATION OF (IN BLOCK LETTERS)

11.1 GUIDE

11.2 SIGNATURE

11.3 CO-GUIDE (IF ANY)

11.4 SIGNATURE

11.5 HEAD OF THE DEPARTMENT

11.6 SIGNATURE

REMARK OF CHAIRMAN AND PRINCIPAL

12.1` SIGNATURE

Dr. ANITA KARANDIKAR PROFESSOR & HEAD OF THE DEPARTMENT OF ORTHODONTICS & DENTOFACIAL ORTHOPAEDICS AL-BADAR RURAL DENTAL COLLEGE & HOSPITAL, GULBARGA

Dr. ANITA KARANDIKAR PROFESSOR & HEAD OF THE DEPARTMENT OF ORTHODONTICS & DENTOFACIAL ORTHOPAEDICS AL-BADAR RURAL DENTAL COLLEGE & HOSPITAL, GULBARGA




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