14 Prediction of Mesiodistal Width of Canine and Premolars in Mixed Dentition Stage

Sarah Husna Khairulzan1, Rowena Diane Saruyan1, and Nagham Al-Jaf1*

1Faculty of Dentistry, Universiti Teknologi MARA, Sungai Buloh Campus, 47000 Sungai Buloh, Selangor, Malaysia

Abstract: Objectives: to assess the applicability of Moyer’s prediction tables and equations to the Malay population and to formulate a regression model to predict the size of mesiodistal width of unerupted canine and premolars if proved necessary. Methods: Dental study models, from the pre-treatment records of Malaysian Malay orthodontic cases in Faculty of Dentistry, UiTM Sungai Buloh, were screened. Our inclusion criteria were matched by 13 male records and 31 female records. Each gender group was subdivided into maxillary and mandibular subgroup. A digital Vernier caliper with an accuracy of 0.01 mm was used to measure the mesiodistal width of the mandibular central and lateral incisors, mandibular and maxillary canines, first premolars, and second premolars of all four quadrants. Using the collected data of the summed widths of the four mandibular incisors and the summed widths of canine and premolars, the applicability of Moyer’s probability table and two different equations were tested. The data were used to formulate a prediction regression equation of the type 𝑦 = a + b𝑥 for one group. Results: One of the tested equations were applicable to all groups except for the male maxilla group. While the other equations were not applicable for all groups. The regression coefficient (r) was 0.6 with an r² value of 0.36 for male maxilla group. Conclusions: Moyer’s 1973 equations are applicable for Malaysian Malay subjects except for the male maxilla group, for which the formulated prediction equation can be used.

DOI: https://doi.org/10.6084/m9.figshare.8188205.v1