Intercanine and intermolar widths in angle class I, II and III malocclusions

Malrelation along the transverse plane is one of the most common causes of malocclusion and can be assessed by considering the intercanine and intermolar widths. An endeavour was undertaken to find the intercanine and intermolar widths on 76 dental casts of the individuals having Class I, Class II division 1, Class II division 2, Class III and Class II subdivision malocclusions, visiting orthodontic department of Sardar Begum dental college and hospital, Peshawar. Results were obtained using SPSS version 20 which showed the mean maxillary intermolar widths of 34.6mm*, 34.5mm, 30.9mm, 34.7 mm and 34.18mm for Class I, Class II division 1,Class II division 2,Class III and Class II subdi-vision groups respectively. Mean maxillary intercanine widths were found to be 24.16mm, 24.5mm, 24.6mm, 23.9mm and 23.05mm for Class I, Class II division 1,Class II division 2,Class III and Class II subdivision groups respectively. Similarly mean mandibular intermolar widths were 32.8mm, 33.02mm, 30.3mm, 33.1mm and 32.8mm for Class I, Class II division 1, Class II division 2, Class III and Class II subdivision groups respectively. While mean mandibular intercanine widths were found to be 19.2mm,19.06mm,20.34mm,19.54mm and 18.75mm for the Class I, Class II division 1,Class II division 2,Class III and Class II subdivision groups respectively. ANOVA analysis showed no sta-tistical significant differences in the intermolar and intercanine widths among the five malocclusion groups

Validity of little's irregularity index on photocopied images of dental casts

Crowding whether primary or secondary is one of the main reasons for seeking orthodontic treatment. Incisor irregularity is an easy and excellent indicator of the severity of crowding. Assessment of incisor irregularity on photocopied images can prove to be a good mean as an alternate to the conventional method of assessment on dental casts. In this study a sample of 58 dental casts were selected using non probability purposive sampling technique. The accuracy of assessment of incisor irregularity on photocopied images is judged by finding its comparison with direct method of assessment on dental casts which showed a good agreement when assessed using paired sample t test [p- value- 0.201] and the correlation was 0.775. An advantage of assessment of incisor irregularity on photocopied images is that the vertical errors that can occur in conventional method are precluded. Thus this study concludes that an alternate way of assessment of incisor irregularity on photocopied images is a reliable diagnostic tool which can be considered in our routine diagnostic procedures

Mesiodistal crown dimensions and bolton ratio in the khan research laboratories employees and their families

Management of occlusion with proper overjet and overbite is the goal of orthodontic treatment. This is not possible if the interarch tooth size discrepancies exist. So measurement of tooth sizes and calculation of interarch tooth size ratios are important diagnostic tools to solve such problems. To determine normative data, mesiodistal crown width of the permanent teeth and Bolton ratio of the KRL [Khan Research Laboratories] sample was taken. This was a descriptive study carried out at the Dental OPD of KRL Hospital, Islamabad from 15th September, 2004 till 15th December, 2005. A mixed sample [male and female] of 500 individuals having Class I occlusion was selected through a non-probability [convenient] sampling technique. Out of this sample 120 patients were selected using probability [simple random] sampling. Normative data on the mesiodistal crown dimensions was obtained [Table 4]. Mean overall interarch tooth width ratio was 91.5, while mean anterior interarch ratio was found to be 79.02. T-tests to compare the ratios of this sample with the ratios of the Bolton sample showed that the difference was nonsignificant for the overall interarch tooth width ratio [P=0.215], while it was highly significant for the anterior tooth width ratio [P=0.00]. Mesiodistal crown dimensions of KRL sample were found to be larger than the American white population. Bolton's overall ratio of 91.3 can be applied on the KRL sample

Arch forms among different angle classifications -a study

The aim of the study was to find out the type of arch form amongst different Angle classifications attending the orthodontic department of Sardar Begum Dental College and Hospital, Peshawar. Consideration of the arch form is of paramount importance, because it is imperative that the arch form should be examined before embarking upon the treatment as this gives valuable information about the position into which teeth can be moved if they are to be stable following treatment. It was a prospective cross-sectional study carried out on a total of 120 individuals irrespective of gender having Angle's class I, II or III occlusion. The results revealed that the most prevalent arch form among the individuals of the sample was of the tapered variety i.e., 49.2% irrespective of the Angle classification while ovoid and square arch forms were 2[nd] and 3[rd] in the prevalence order i.e., 29.2% and 21.2% respectively. The study emphasizes that consideration should be given to the arch form specific for the particular individual