Naveen Kumar, K (2008) Mixed Dentition Analysis - Applicability of two Non Radiographic methods in Chennai School Children. Masters thesis, Ragas Dental College and Hospital, Chennai.
|
Text
240802308naveenkumar.pdf Download (1MB) | Preview |
Abstract
INTRODUCTION : Occlusion refers to the relationship between the upper and lower teeth when they are in contact; it refers to the alignment of teeth as well as the relationship of the dental arches. Orthodontic patients mainly seek treatment for improvement of dental esthetics and oral health. Tooth malalignment is associated with plaque accumulation, gingival inflammation, or caries only in severe cases and in patients with insufficient oral hygiene. However, there might be another, indirect contribution of dental occlusion to oral health. Research on general body concept has found that individuals perceiving their dental appearance as less attractive may feel discouraged in performing health behaviors to improve or preserve their physical condition. They tend to avoid not only the presentation of their body in public but also self-confrontation with the mirror image. As a consequence, such individuals tend to exercise less and show more maladaptive nutritional habits than attractive individuals do. It has been suggested that such a relationship between attractiveness and health behavior might also apply to dentistry. The mixed dentition is a transition period of occlusion that has both primary and permanent teeth, usually lasts from six to twelve years and is associated with maximum orthodontic problems due to the inadequacy of space for erupting permanent teeth. An early assessment of available space may permit early intervention or minimize the development of malocclusion. AIMS AND OBJECTIVES : The aim of this study was to evaluate the applicability of the Tanaka and Johnston (1974) and the Moyer’s (1988) methods of predicting the size of permanent canines and premolars in Chennai school children. OBJECTIVES : 1. To compare the predicted values of m-d widths of permanent canines and premolars from Tanaka and Johnston (1974) Moyer’s method (1988) with the measured values. 2. To provide the base line data with the measured mesio distal diameter of all permanent teeth till first permanent molar for the Chennai children. MATERIALS AND METHODS : Five hundred sets of dental casts were obtained from children during the school dental health camps in and around Chennai. Thirty sets of sample were removed during the final selection as nine casts were damaged during transportation, eleven casts had one or more teeth partially erupted and ten casts had retained decidous teeth, which did not satisfy the inclusion criteria. The final sample consists of 470 sets of which 127 were girls and 343 were boys. Standard orthodontic trays were used for impression taking and impressions were taken with alginate material in the usual manner. The impressions were poured in dental stone immediately to reduce any error. All children were subjected to clinical examination at the start of the study with medical and dental histories taken. The sample criteria include: 1. Indigenous Chennai patients of south Indian descent with fully erupted permanent incisors, permanent canines, and premolars in both maxillary and mandibular arches. 2. The patients had to be free of any systemic disease or serious health problems. 3. Patients with teeth free from restorations, proximal wear, fractures or proximal caries as determined by clinical examination. 4. Patients with teeth free from any hypoplasia or other dental anomalies as in number, size and shape of the tooth 5. A maximum age of 15 years to preclude any discrepancies due to significant proximal wear. 6. High quality dental study casts free from any distortions. OBSERVATIONS AND RESULTS : The present study is aimed at evaluating the applicability of the Tanaka and Johnston (1974) and the Moyer’s (1988) methods of predicting the size of permanent canines and premolars in Chennai school children. A digital vernier gauge, whose measuring beaks were sharpened, was used to measure the mesio distal widths of the individual teeth in order to increase the accuracy. All the teeth from left first molar through to the right first molar of each set of dental casts were measured to the nearest 0.01 mm. The values obtained by measuring the four hundred and seventy sets of casts were tabulated in the Table 1.This basic measured data obtained is used for all the regression equations and it is also helpful in providing the Odontometric data of Chennai school children. This table consists of one twenty seven female subjects and three forty three male subjects. The means and standard deviations of the measured mesio distal widths of the individual teeth are presented for male subjects in Table 2. The measured mean diameter, for Central Incisor was 8.75 ± 0.51, Lateral Incisor 7.04 ± 0.48, Canine 7.88 ± 0.38, First Premolar 7.12 ± 0.38, Second Premolar 6.66 ± 0.46, and First Molar 10.29 ± 0.53, in the maxillary arch and mean diameter for Central Incisor 5.49 ± 0.36, Lateral Incisor 6.09 ± 0.46, Canine 6.93 ± 0.39, First Premolar 7.19 ± 0.35, Second Premolar 7.08 ± 0.38, and First Molar 11.21 ± 0.55 in the mandibular arch. CONCLUSION : The present study was conducted to evaluate the applicability of the Tanaka and Johnston (1974) and the Moyer’s (1988) methods of predicting the size of permanent canines and premolars in Chennai school children. The following conclusion were derived from this study: 1. Significant sexual dimorphism in tooth sizes exist in Chennai population 2. There is significant bilateral symmetry seen in both the sexes. 3. Sum of the mesio distal diameter of permanent mandibular incisors can be used reliably to predict the sum of mesio distal diameter of unerupted canines and premolars. 4. Tanaka and Johnston (1974) method cannot accurately predict the mesio distal widths of unerupted canines and premolars of Chennai children due to the high variability in estimation. 5. The Moyer’s (1988) prediction tables can be used to estimate the mesio distal widths of unerupted canines and premolars closer to 50% probability level
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Mixed Dentition Analysis, Applicability of two Non Radiographic methods, School Children. |
| Subjects: | DENTAL > Paedodontics and Preventive Dentistry |
| Depositing User: | Kambaraman B |
| Date Deposited: | 22 Jan 2018 11:48 |
| Last Modified: | 22 Jan 2018 11:48 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/5521 |
Actions (login required)
 |
View Item |
