Determination of Stature Using Tooth Length

Background: Stature plays a major role in forensic identification. It is also considered to be one of the fundamental compo- nents of physical anthropology. When a full skeleton is not available, stature can be estimated from incomplete human remains. Teeth form an excellent material for anthropological, genetic, odontologic and forensic investigations. Various studies have ventured to ascertain the usefulness of tooth crown measurements in stature prediction. Methodology: Tooth lengths of all 28 teeth except 3rd molars were measured on digital OPG using inbuilt software IMPAXH (Agfa, Belgium). Stature was measured from the vertical distance from the vertex of head to the floor. Correlation between the tooth length and height of an individual was done by Pearson correlation test and linear regression analysis for prediction of stature from tooth length. Result & conclusion: Overall the results revealed that individual tooth variables have a good correlation with stature with r value ranging from 0.12-0.57 and p value less than 0.05. Among the tooth lengths, the length of the maxillary right molars showed the highest correlation with stature followed by maxillary right premolars and maxillary right canine than the other teeth. Regression equation was generated from tooth length, to predict height.

Assessment of root canal morphology of mandibular first premolars in the Indian population using spiral computed tomography: An in vitro study.

Aim: The aim of the study is to determine the root canal morphology of the mandibular first premolar teeth in an Indian population using spiral computed tomography (SCT). Materials and Methods: One hundred extracted mandibular first premolars were observed using Spiral Computed Tomography for the (i) Pattern of root canal (ii) Tooth length (iii) Position of the bifurcation of the canal (iv) Invagination of the root (v) Root thickness. The root canal morphology was classified based on Vertucci's classification. Results: Eighty percent of the teeth had a single canal, 11% of the teeth had two canals, and C-shaped canals were found in 2% of the teeth, in this study. The average length of the teeth was 21.6 mm. Fourteen percent of the teeth had mesial invagination of the root. Conclusion: The Type I root canal morphology was the most common type of root canal system in the mandibular first premolars among the Indian population in this study.

Change in tooth length and angulation on panoramic radiographs taken at different labiolingual and buccolingual inclinations / 대한치과교정학회지

OBJECTIVE: The purpose of this study was to examine how the mesio-distal angulation and the length of each tooth changes on panoramic radiograph at different bucco-lingual inclinations. METHODS: After constructing an acrylic model based on the mean arch of 30 adults with normal occlusion, the wire was placed in the center of the teeth on the acrylic model. First, the wire was implanted in normal angulation and inclination and a panoramic radiograph taken. After changing the inclination from I-15 degrees to I+15 degrees by 5 degrees a panoramic radiograph was taken again and the mesio-distal angle and wire length on the panoramic radiograph were assessed. RESULTS: When the wire was implanted at the normal angulation and inclination, the length measured in the panoramic radiograph was magnified 111 ~ 117% from the original length in the anterior region and 121 ~ 125% in the posterior region. Only the central and lateral incisors showed significant length differences when the inclination was changed from I-15 degrees to I+15 degrees at fixed angulation. When the inclination was changed from I-15 degrees to I+15 degrees, the angulation of most teeth on panoramic radiograph appeared to be more disto-angulated than in reality, and the lateral incisor and canine showed the largest difference. Only I-15 degrees, I+15 degrees groups of premolars and I+15 degrees group of molars showed more mesio-angulation than in reality. As the labio(bucco)lingual inclination of all teeth were decreased, tooth angulation in the panoramic radiograph appeared to be more disto-angulated. CONCLUSION: The labio-liugual inclination of teeth should be considered because it affects panoramic image of teeth, such as length of incisors and angulation of other teeth.

Permanent tooth length measured during endodontic treatment.

The severity of dental caries which pulp exposes are mostly extracted. Endodntic treatment is the best choice are limited at apical constriction (cemento-dentinal junction) which average distrance 0.5 to 1 milimeter from root apex. The purpose of this study is the measuring of tooth length from the heighest point of crown to root apex. One thousand and two hundred endodontic patients, more than nine years old, has been studied at the dental department, Siriraj Hospital, Mahidol University. The treated tooth has been measured tooth length before and after instrumentation by endodontic file. The result are should that male to female patient are 1:1.86 and average tooth length as followed; upper central incisor, lower central incisor, upper lateral incisor, lower lateral incisor, upper canine, lower canine were 21.7+1.87, 18.7+1.96, 20.4+1.94, 19.8+1.46, 23+1.78 and 21.2+1.65 millimeters respectively. The average length of upper first bicuspid, lower first bicuspid, upper second bicuspid, lower second bicuspid, upper first molar, lower first molar, upper second molar, lower second molar, upper third molar and lower third molar were 18.9+1.45, 19.7+1.42, 18.9+1.47, 19.4+1.68, 18.3+1.58, 18.8+1.32, 18.2+1.74, 18.2+1. 4, 17+0.81 and 16.7+1.68 millimeters respectively. The average tooth length is guided to enlarge and filling root canal in the process of endodontic treatment.