Mesiodistal Crown Diameters Research Articles

No relationship found between dental fluctuating asymmetry, birthweight, and birth term in two modern North American samples.

Deciduous dental crowns primarily develop during gestation and early infancy and embody early life stress exposures. Composite measures of dental fluctuating asymmetry (DFA) generated from the deciduous teeth may therefore indicate cumulative gestational stress in developmental origins of health and disease (DOHaD) studies. This study examines whether higher composite measures of deciduous DFA are associated with low birthweight and prematurity, two aspects of birth phenotype consistently associated with increased morbidity and mortality risks in adulthood. We evaluated associations between composite deciduous DFA, birthweight, and birth term in two contemporary North American samples: an autopsy sample from New Mexico (n = 94), and sample from a growth cohort study in Burlington, Ontario (n = 304). Dental metric data for each sample was collected from postmortem CT scans and dental casts, respectively. Composite DFA was estimated using buccolingual (BL) and mesiodistal (MD) crown diameters from paired deciduous teeth. Contrary to expectations, the results of linear regression indicated no significant relationship between birthweight and DFA, or birth term and DFA, in either sample. Deciduous DFA does not predict aspects of birth phenotype associated with gestational stress. Birthweight and birth term are plastic relative to the more developmentally stable deciduous dentition, which may only subtly embody early life stress. We suggest that deciduous DFA should be utilized with caution in DOHaD studies until its relationship with gestational stress is clarified.

The relationship of tooth crown dimensions between first molar and central incisor in maxilla.

The purpose of this study was to investigate a correlation between the cusp dimensions of the first molar and mesiodistal crown diameters of the central incisors in the maxilla. The study materials were composed of dental casts from 29 modern Japanese female subjects with a mean age of 20years and 8months. The mesiodistal crown diameters of the maxillary central incisors were measured. The mesiodistal and bucco-lingual crown diameters and the cusp diameters of the maxillary first molars, such as the paracone, metacone, protocone, and hypocone, were also measured. The crown areas and indices of the first molars were calculated. The Spearman's single rank correlation coefficients between the mean values for the crown dimensions of the first molars and the mesiodistal crown diameters of the central incisors were calculated. The hypocone cusp diameter and the hypocone index were the largest compared to those of the paracone, protocone, and metacone cusps. The bucco-lingual diameter and hypocone cusp diameter of the first molars positively correlated with the mesiodistal crown diameters of the central incisors on the same sides. There were positive correlations between the hypocone index of the first molars and the mesiodistal crown diameters of the central incisors. Based on the results, if a large hypocone is observed in eruption of the maxillary first molars, it will be predictable that of the mesiodistal crown diameter of the maxillary central incisor large.

Accuracy of Deciduous and Permanent Molar Teeth in Gender determination of Egyptian Children: Dental and Forensic Implications

Forensic odontology is an investigative aspect of dentistry that apply dental knowledge for legal issues including identification of unknown human bodies or remains. Sexual dimorphism of permanent teeth measurements has been extensively studied but, no studies involved pediatric age group with mixed deciduous and permanent dentition. The aim of this study was to determine accuracy of maxillary and mandibular deciduous and permanent molar teeth in sex determination in a sample of Egyptian children. Additionally, to estimate crown size of mandibular permanent first molar from mandibular deciduous second molar. A sample of 210 male and female children aged 6-12-years, in mixed dentition stage. Mesio-distal (MD) crown diameters of maxillary and mandibular permanent first molars and deciduous second molars were measured by a digital caliper. The mean MD crown diameter of both Rt maxillary and mandibular permanent first molars was significantly higher in males than females (10.29±.31 vs10.00±.60 and 11.01±.51 vs10.71±.60 respectively, p < 0.001). Furthermore, Rt and Lt mandibular deciduous second molars exhibited significantly larger mean MD diameter in males (9.94±.44 and 9.98±.42) than females (9.71±.46 and9.74±.46). Further, Simple linear regression revealed new equations for prediction of crown size of mandibular Rt permanent first molar from mandibular Rt deciduous second molar. Odontometric study of deciduous and permanent molar teeth showed poor accuracy in sex determination. They can be used in conjunction with other traits to establish gender accurately. Furthermore, this work presented new equations that will be helpful in estimating crown size of mandibular permanent first molar from mandibular deciduous second molar.

Mesiodistal Crown Diameter of Normal Occlusion and Different Malocclusion Groups for a Sample of Kurdish Population of Erbil City

It is essential to know the tooth crown size to provide accurate diagnosis and treatment planning to ensure the satisfactory outcome of orthodontic treatment. The aim of the present study was to measure and compare mesiodistal crown diameter of a Kurdish sample in Erbil city with normal and different classes of malocclusion. The mesiodistal tooth width was measured by an electronic digital caliper on a total of 150 (75 males and 75 females) orthodontic models of secondary school students of different occlusal relationships (Class I normal occlusion, Class I, Class II division I, Class II division II, and Class III malocclusions). The results showed that (1) the maxillary right first molar was significantly larger than the left one and both maxillary right lateral incisors and first premolars were larger than their contralateral teeth at the level of P &lt; 0.01. (2) Both upper and lower canine were significantly smaller in females than in males; (3) Class I malocclusion showed tendency toward larger teeth than the rest of the other occlusal categories; (4) no statistically significant differences in tooth size were found among the Class II division I, division II, and Class III malocclusions when compared to normal occlusion. In conclusion, females had smaller teeth than males and there was asymmetry between the right and left sides in tooth size and Class I malocclusion showed tendency toward larger teeth.

Gender Difference in the Prediction of Crown Widths of Unerupted Permanent Canines and Premolars with Crowded Teeth

Aims: To determine whether the accuracy of the prediction of the summed widths of unerupted permanent canines and premolars depend on the patient's gender and to examine whether there are differences between sexes in the best combination of independent variables for predicting and to developing new predicting equations for crowding patient for both jaws and both sexes. Materials and methods: The sample consisted of eighty dental casts (40 males and 40 females). The age ranged between (14-22) years and all patients have anterior crowding. The mesiodistal crown diameters of the central incisors, the lateral incisors, the canines, the first premolar, the second premolar, and the first molars in the maxillary and mandibular arch were measured on dental casts. Basal arch lengths and intermolar distances for the upper arch and for the lower arch were also recorded. Predicted sum widths of permanent canines and premolars in both dental arches were calculated using backward multiple regression analysis by using statistical package for social science (SPSS). Results: In the male subject group, there were statistically significant correlations between central incisor and lateral incisor widths in the maxilla (r=0.456) and in the mandible between lower central and lateral incisor widths and lower basal arch length (r=0.682), and in the female subject group, there were statistically significant correlations between the central incisor and the lateral incisor widths, upper first molar, upper basal arch length and upper inter molar distance (r=0.742). For the mandible, lower central and lateral incisor and lower first molar widths (r=724). Also the correlation coefficients (r) and determination coefficients (R2 ) for female group are greater when compared with those for the male subject group. Conclusions: Four regression equations for crowding patients for both gender are establish and the best combination of independent variables for prediction was found to differ between sexes.

Evaluation of Root Canal Morphology of Permanent Maxillary Canine Using CBCT – A Cross-sectional Study

Background : A clear understanding and thorough knowledge of anatomy of human teeth is the utmost of importance to all dental procedures especially in endodontic and orthodontics treatment. This includes the study of root canal anatomy and its variations according to the race and gender.Aim : The scope of the research was to determine the root and canal morphology of the maxillary canine in Indian population by analyzing cone-beam computed tomography (CBCT) images.Material and Method : Forty-six CBCT images consisting of 20 males and 26 females were examined in this study and a total of 88 maxillary canines were analyzed. The root anatomy of each tooth was evaluated for the following parameters: the root canal patterns, the shape of the access cavity, the mesiodistal width of the crown and the distance from occlusal pit to the pulp chamber. The data was analyzed and compared and p-value of the data was considered 0.05 statistically.Result : It can be concluded that a higher prevalence of maxillary canines have Type I root canal pattern in both gender. The most common shape of access cavity in male subjects was oval. Round access cavity was the most frequently observed in female subjects. Maxillary canine in male population also had greater mesiodistal crown diameter than female population.Conclusion : The present study reported the normal anatomy and variations of maxillary canines in Indian population. The incidence of root canal morphology differed with gender.

Tooth Crown Size of the Permanent Dentition in Subjects with Thalassemia Major

Thalassemia refers to a group of hereditary anemias resulting from defects in synthesis of either alpha or the beta polypeptide chains of hemoglobin. The homozygous form of beta thalassemia (thalassemia major) exhibits the most severe clinical symptoms. Odontometric analysis of subjects with thalassemia are lacking, despite the wide distribution of the disease and its orofacial characteristics. The aim of this study was to provide detailed descriptions of tooth crown size in the permanent dentition of subjects with thalassemia major and to compare the findings with those of the same population. Dental casts of 46 thalassemic subjects, 25 males and 21 females, aged 7.3 to 23.7 years, were measured for the mesiodistal and buccolingual crown diameters. Crown size variability, correlations, sexual dimorphism, and summary measurements are presented. All means for mesiodistal and buccolingual dimensions in males exceeded those in females, with 18 of the 28 comparisons statistically significant (ranged from P&lt;0.05 to P&lt;0.001, t-test). With the exception of maxillary central and lateral incisors and mandibular first molars, all other teeth exhibited greated buccolingual diameters than mesiodstal. No specific pattern of percentages of sexual dimorphism was noted between the mesiodistal and buccolingual diameters. Comparison of the mesiodistal crown diameters in thalassemic subjects with unaffected control group showed that thalassemic males and females have significantly smaller dimensions than their controls, with 9 of the 24 comparisons being highly significant.

Size does matter: Variation in tooth size apportionment among major regional North and sub-Saharan African populations

In the 1980s Edward Harris proposed an approach using principal components analysis to compare mesiodistal and buccolingual crown diameters in humans. A major goal was to remove overall “size” from the measurements – which is ineffective for biological affinity. Relative size, however, is important, i.e., to assess how it is apportioned along the tooth rows. To get at such data, Harris utilized three size predictors in multiple linear regression to calculate PC 1 residuals, which were then used with other uncorrected components in analysis.Here we demonstrate that it is still an effective method, by comparing 32 MD and BL measurements in 12 (n=712) and 18 (n=1251) samples from sub-Saharan and North Africa. Plotting of the first three components (50% of variance) shows clear separation between regions. North Africans are characterized by: 1) small LI1s, and BL dimensions of the UM1, LI2, and LM1, and 2) large MD diameters of the UM2 and LM1, and BL diameters of the LM2 and LM3. Comparisons of North Africans only show the ability to distinguish among samples from the Maghreb, Egypt, and Nubia. In other words, basic crown diameters can be successfully used for affinity estimation, if relative size, a.k.a., “shape” is accounted for.

The application of multi-baseline digital close-range photogrammetry in three-dimensional imaging and measurement of dental casts.

ObjectiveTo explore a new technique for reconstructing and measuring three-dimensional (3D) models of orthodontic plaster casts using multi-baseline digital close-range photogrammetry (MBDCRP) with a single-lens reflex camera.Study designThirty sets of orthodontic plaster casts that do not exhibit severe horizontal overlap (>2 mm) between any two teeth were recorded by a single-lens reflex camera with 72 pictures taken in different directions. The 3D models of these casts were reconstructed and measured using the open source software MeshLab. These parameters, including mesio-distal crown diameter, arch width, and arch perimeter, were recorded six times on both the 3D digital models and on plaster casts by two examiners. Statistical analysis was carried out using the Bland–Altman method to measure agreement between the novel method and the traditional calliper method by calculating the differences between mean values.ResultsThe average differences between the measurements of the photogrammetric 3D models and the plaster casts were 0.011–0.402mm. The mean differences between measurements obtained by the photogrammetric 3D models and the dental casts were not significant except for the lower arch perimeter (P>0.05), and all the differences were regarded as clinically acceptable (<0.5 mm).ConclusionsMeasurements obtained by MBDCRP are compared well with those obtained from plaster casts, indicating that MBDCRP is an alternate way to store and measure dental plaster casts without severe horizontal overlap between any two teeth.

Comparison of Bolton’s Ratios in a Sample of Iraqi and Egyptian Populations

Background: The objective of this study was to investigate the possibility of standardizing the Bolton ratio analysis as a diagnostic measure for both Iraqi and Egyptian orthodontic populations within three Angle' classification groups. Materials and methods: Two hundred forty pretreatment study casts (one hundred twenty of each population) were included in this study and divided into three Angle' classification groups. The mesiodistal crown diameters of all teeth were measured for computing the anterior and total Bolton ratios. Analysis of variance was performed to compare the mean ratios of Bolton analysis as a function of the Angle classification.HSD test was used to specify the classes of malocclusion that have significant differences. Results: No statistically significant differences were determined in the mean values of the anterior ratio among the angle classification groups in both Iraqi and Egyptian populations. No statistically significant differences were determined in the mean values of the overall ratio among the angle classification groups in Iraqi population. While there were statistically significant differences in the mean values of overall ratio among the angle classification groups in Egyptian population. This difference is specified with in class II malocclusion of Egyptian population. Conclusion: Anterior Bolton ratio can be standardized for both Iraqi and Egyptian orthodontic populations. While the overall ratio can be standardized only in class I and III malocclusions of both populations.

Third-molar mineralization as a function of available retromolar space

Objective: To test in the maxilla and mandible for an association between stage of third-molar (M3) mineralization and space in the jaws for M3 eruption. Mineralization is hypothesized to be delayed not only for impacted M3s but also for M3s with eruption space less than their mesiodistal crown diameter.Material and methods: Retrospective cone beam computed tomography (CBCT) scans of 37 females and 32 males aged 17–24 years, for a total sample of 197 upper and lower M3s, were used to assess the status of M3 eruption and measure the M3 crown diameter (CD) relative to the length of the retromolar space (RS). Stage of M3 mineralization was then compared between impacted and erupting M3s as well as between two conditions of relative eruption space (RS/CD ≥ 1 versus RS/CD < 1) using Mann–Whitney U tests.Results: Impacted M3s were at significantly earlier (delayed) stages of mineralization compared to erupting M3s. Mineralization was also delayed for M3s with eruption space less than their mesiodistal crown diameter (e.g. RS/CD < 1). A moderate positive correlation between stage of M3 mineralization and space was seen in both jaws, and was stronger in the mandible.Conclusion: Our study shows for the first time that stage of M3 mineralization is associated not only with impaction but also with amount of retromolar space, and that these associations are consistent in upper and lower jaws. Present findings underscore that M3 mineralization stage may be a clinically useful predictor of M3 impaction that thus merits further investigation.

The Relationship between Palatal Displacement of Upper Canines and Incisors Widths in a Syrian Sample of Patients with Uncrowded Arches.

The aim of this study investigates mesiodistal crown size of the maxillary and mandibular incisors of patients with palatally impacted canines (PDC). Pretreatment dental casts of orthodontic patients with PDC of one or both maxillary canines (N: 33) were collected. This PDC sample was matched according to age and sex with pretreatment dental casts from unaffected orthodontic patients. For the PDC and matched control samples, maximum mesiodistal crown diameters were recorded for the four incisors on the right side only. The results showed that, on average, the mesiodistal crown diameters for the maxillary and mandibular incisors measured smaller in the PDC sample than in the control sample. These findings of statistically significant tooth-size reductions associated with PDC occurrence indicate a generalized pattern of reduced tooth size as a characteristic associated with the PDC anomaly. Further, the presence of generalized tooth-size reduction in cases with palatally displaced canines help explain why most orthodontic treatment plans for PDC patients are of the nonextraction type.

The relation between the mesio-distal crown widths of the deciduous second molars and the permanent first molars

Background: This study aimed to find whether there is a relation between the mesio-distal crown diameters of the deciduous second molars and the permanent first molars in an Iraqi sample from Baghdad city. Material and methods: The sample consisted of 54 Iraqi children aged 8-9 years at the mixed dentition stage. The measurements included the mesio-distal crown width of the deciduous second molars and the permanent first molars on the study casts using digital sliding vernier. Results: The results revealed absence of the side difference of the widths of teeth measured. High significant gender difference was detected for the permanent first molars and the deciduous second molars except mandibular permanent first molar. On the other hand, high significant difference was found between the maxillary and mandibular arches for the permanent first molars and the deciduous second molars except for the permanent first molar in males. A direct strong significant correlation was found between the width of the permanent first molars and the deciduous second molars. Conclusion: The findings of the present study may be used as predictive factor for tooth – jaw disharmony and the possibility for the crowding in the future.

Sex determination by tooth size in a sample of Greek population

Sex assessment from tooth measurements can be of major importance for forensic and bioarchaeological investigations, especially when only teeth or jaws are available. The purpose of this study is to assess the reliability and applicability of establishing sex identity in a sample of Greek population using the discriminant function proposed by Rösing et al. (1995).The study comprised of 172 dental casts derived from two private orthodontic clinics in Athens. The individuals were randomly selected and all had clear medical history. The mesiodistal crown diameters of all the teeth were measured apart from those of the 3rd molars. The values quoted for the sample to which the discriminant function was first applied were similar to those obtained for the Greek sample. The results of the preliminary statistical analysis did not support the use of the specific discriminant function for a reliable determination of sex by means of the mesiodistal diameter of the teeth. However, there was considerable variation between different populations and this might explain the reason for lack of discriminating power of the specific function in the Greek population. In order to investigate whether a better discriminant function could be obtained using the Greek data, separate discriminant function analysis was performed on the same teeth and a different equation emerged without, however, any real improvement in the classification process, with an overall correct classification of 72%. The results showed that there were a considerably higher percentage of females correctly classified than males.The results lead to the conclusion that the use of the mesiodistal diameter of teeth is not as a reliable method as one would have expected for determining sex of human remains from a forensic context. Therefore, this method could be used only in combination with other identification approaches.

Estimating the size of unerupted canine and premolars in a mixed Indian population

Introduction: This study was carried out to determine the correlation between the sum of the mandibular permanent incisors and the combined mesiodistal crown diameters of the maxillary and mandibular canine and premolars in a sample of mixed Indian subjects, examine the applicability of the Tanaka and Johnston method of prediction in a mixed Indian population and develop a new prediction method for this specific population. Materials and Methods: The dental models of the dentition of 251 mixed Indian patients below the age of 21 years, who had upper and lower permanent canines and premolars erupted were selected for this study. All the measurements were made by an observer with modified Boley gauge with Vernier caliper. Results: The differences between the predicted widths of the canine and premolars with the Tanaka and Johnston equations and the actual widths were highly statistically significant, as indicated by t-tests. The actual widths of the maxillary canine and premolars showed a significant difference in size (P = 0.0001) from the widths predicted by the Tanaka and Johnston equation, as did the canine and premolars in the mandible (P = 0.0003). Conclusion: The current findings suggest that the accuracy of originally derived Tanaka and Johnston mixed dentition analysis method can be increased using a newly derived regression equations based on a local mixed Indian population.

Mesio-Distal and Buccal-Lingual Tooth Dimensions are Part of the Cleft Spectrum: A Pilot for Future Genetic Studies

Objective : Considering that oral clefts and tooth dimensions may be part of the same phenotypic spectrum, the aim of this study was to investigate tooth dimensions in permanent dentition and dental malformations, including tooth size discrepancies, of subjects born with clefts compared with individuals without clefts. Design : Cross-sectional study. Participants : The cleft group was composed of 66 subjects, and the noncleft group consisted of 66 healthy unrelated subjects. Main Outcome Measures : The mesio-distal and buccal-lingual crown diameter of fully erupted permanent teeth outside the cleft area was measured using a digital caliber. Clinical records and radiographs were used to evaluate the type of clefts and dental anomalies. Results : The lower second premolar was significantly reduced in the CLP and CP groups. The upper lateral incisor was found to be significantly smaller in the CP group, only for mesio-distal dimensions (P < .05). Dental agenesis was found in eight (12%) cleft subjects and supernumerary teeth in two (3%). Conclusions : Subjects born with oral clefts presented size reduction in specific dental groups.

Dento-facial relationships in individuals with normal occlusion

The aim of this study was to evaluate the relationships of selected facial measurements with mesio-distal crown widths and dental arch dimensions in individuals with normal occlusions. A cross-sectional study was conducted on 276 subjects with Angle's Class I normal occlusions. Three-dimensional images of the face and dental casts were captured and analyzed using stereophotogrammetric systems. Significant correlations were found between the sagittal facial variables and both upper and lower dental arch dimensions and to lesser degree with the horizontal and vertical variables. The values of correlation coefficients calculated between facial and dental crown measurements ranged from .01 to .50 for upper teeth and .01 to .49 for lower teeth. The values of correlation coefficients between facial and upper dental arch dimensions ranged from .01 to .55 and those between facial and lower dental arch dimensions ranged from .01 to .60. A principal components analysis showed that the sagittal dimensions, face height, nose, labial fissure, binocular widths were positively associated with dental arch dimensions and mesio-distal crown diameters in males. On the other hand, only the sagittal variables were associated with dental dimensions in females. The results of this study confirm that positive associations exist between facial and dental arch dimensions. These relationships should be taken into consideration when attempts are made to modify dental arch size as part of orthodontic treatment. Moreover, these relationships are also relevant to prosthodontists involved with selecting tooth sizes that display optimal functional balance with the craniofacial structures.

Mesiodistal crown diameters and tooth size discrepancy of permanent dentition in thalassemic patients

Objectives: To provide a description of mesiodistal crown diameters (MD) and tooth-size discrepancy (TSD) of the permanent dentition in patients with thalassemia major (TM) and to compare the results with those of unaffected control group. Study design: The sample consisted of 46 thalassemic patients, 25 males and 21 females aged 7.3 to 23.7 years (mean ± SD = 11.2 ± 3.9 years) and control group matched by age and sex. Dental casts of the participants were measured for MD, using a digital sliding caliper. Descriptive statistics were computed for each individual tooth. Student t-test was used for comparison of mean values between males and females as well as between thalassemic and control groups. The differences between sets of data were evaluated by analysis of variance (ANOVA). Results: All means for MD of thalassemic males and females were smaller than their controls, with 20 of the 24 comparisons being statistically significant (ranged from P<0.05 to P<0.001). In both thalassemic and control groups, males exhibited significantly larger MD than females in most instances. Canines displayed the most sexual dimorphic teeth in the dentition. Lateral incisors showed the greatest variability indicated by the coefficient of variation, while the first molars were the least variable teeth (7.6% vs. 5.3%). There were no statistically significant differences in the anterior and overall tooth-size discrepancy ratios between sexes or between thalassemic and control groups. The mean anterior ratio (79.5%) and overall ratio (92.4%) of the control group were significantly larger than of Bolton ratios; P< 0.001 and P<0.05, respectively. Conclusions: The present study demonstrated that thalassemic males and females exhibited significantly smaller MD than the control group. The TSD ratios in both thalassemic and control groups were significantly larger than those of Bolton sample. These findings should be taken into account when planning orthodontic treatment for thalassemic patients. Key words:Permanent dentition, tooth size, thalassemia major.

Prediction of the size of unerupted canines and premolars in an Iranian population

One of the important aspects of diagnosis and treatment planning in the mixed dentition is estimation of the size of unerupted permanent canines and premolars. One of the most commonly used the prediction methods are Tanaka and Johnston, which are based on data from a sample of Northern European descent children. The accuracy of this method when applied to a different ethnic population is questionable. The aim of this study was to determine the modified equations from Tanaka and Johnston for Iranian population. This study was an analytic and cross-sectional investigation with the randomized cluster sampling in Ahwaz. Fifty four students of 14-18 years age (32 girls, 22 boys) were selected between 320 students and plaster models of their maxillary and mandibular arches were prepared. Subjects had fully erupted teeth, class I canine and molar relationship and presented no proximal caries or fillings, morphological anomalies, missing teeth or occlusal abrasion, and bruxism. The mesiodistal crown diameters of the permanent teeth were measured with using the sharpened boley gauge (accuracy 0.01 mm). The data were analyzed by using the regression correlation analyses and t-test. The size of permanent canines and premolars were larger in maxilla than mandible and males than females. These values in Iran were different from other countries. In this study to predict the space (in mm) required for alignment of unerupted canine and premolars in Iranian children, halve the sum of mesiodistal dimension of the four mandibular incisors and add the respective constants 10.5 for upper jaw and 10 for lower jaw.

Applicability of tooth size predictions in the mixed dentition space analysis in Nalgonda population

Aim: The aim of this study was to evaluate the applicability of the Tanaka-Johnston and Moyer's methods for predicting the size of permanent canines and premolars in Nalgonda population. Materials and Methods: 200 sets of dental casts (13-16 years) of the permanent dentition with no detected abnormalities were obtained from children attending in and around the schools of Nalgonda. The actual mesiodistal crown diameters were measured with digital vernier calipers (Zoom, Japan) to accuracy of 0.01 mm. The actual values were then compared with the predicted values derived from the Tanaka and Johnston equations and Moyer's probability tables. Correlation and linear regression analyses were performed between the predicted and the actual tooth size and standard regression equations were developed. Results: In the present study, Tanaka and Johnston regression equation overestimated the mesiodistal widths of permanent canine and premolars (P Conclusion: Tanaka and Johnston analysis overestimated the actual widths of the unerupted canines and premolars in the maxillary and mandibular arches of male and female subjects of Nalgonda population. New standardized regression equations were formulated for the prediction of the mesiodistal widths of unerupted canines and premolars. Moyer's prediction tables can be used at all probability levels for male and female subjects of Nalgonda.