title: Multivariate analysis of factors affecting presence and/or agenesis of third molar tooth.
abstract: To investigate the presence and/or agenesis of third molar (M3) tooth germs in orthodontics patients in Malaysian Malay and Chinese population and evaluate the relationship between presence and/or agenesis of M3 with different skeletal malocclusion patterns and sagittal maxillomandibular jaw dimensions. Pretreatment records of 300 orthodontic patients (140 males and 160 females, 219 Malaysian Malay and 81 Chinese, average age was 16.27±4.59) were used. Third-molar agenesis was calculated with respect to race, genders, number of missing teeth, jaws, skeletal malocclusion patterns and sagittal maxillomandibular jaw dimensions. The Pearson chi-square test and ANOVA was performed to determine potential differences. Associations between various factors and M3 presence/agenesis groups were assessed using logistic regression analysis. The percentages of subjects with 1 or more M3 agenesis were 30%, 33% and 31% in the Malaysian Malay, Chinese and total population, respectively. Overall prevalence of M3 agenesis in male and female was equal (P>0.05). The frequency of the agenesis of M3s is greater in maxilla as well in the right side (P>0.05). The prevalence of M3 agenesis in those with a Class III and Class II malocclusion was relatively higher in Malaysian Malay and Malaysian Chinese population respectively. Using stepwise regression analyses, significant associations were found between Mx (P<0.05) and ANB (P<0.05) and M3 agenesis. This multivariate analysis suggested that Mx and ANB were significantly correlated with the M3 presence/agenesis.
authors: Orthodontic Unit, School of Dental Science, Universiti Sains Malaysia, Kota Bharu, Kelantan, Malaysia.
authors: Mohammad Khursheed
authors: MK
authors: Alam
authors: Orthodontic Unit, School of Dental Science, Universiti Sains Malaysia, Kota Bharu, Kelantan, Malaysia.
authors: Muhammad Asyraf
authors: MA
authors: Hamza
authors: Orthodontic Unit, School of Dental Science, Universiti Sains Malaysia, Kota Bharu, Kelantan, Malaysia.
authors: Muhammad Aizuddin
authors: MA
authors: Khafiz
authors: Oral and Maxillofacial Surgery Unit, School of Dental Science, Universiti Sains Malaysia, Kota Bharu, Kelantan, Malaysia.
authors: Shaifulizan Abdul
authors: SA
authors: Rahman
authors: Oral and Maxillofacial Surgery Unit, School of Dental Science, Universiti Sains Malaysia, Kota Bharu, Kelantan, Malaysia.
authors: Ramizu
authors: R
authors: Shaari
authors: Periodontology Unit, School of Dental Science, Universiti Sains Malaysia, Kota Bharu, Kelantan, Malaysia.
authors: Akram
authors: A
authors: Hassan
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008964:Molar, Third / Q000196:embryology*; D015999:Multivariate Analysis; D012307:Risk Factors; D055815:Young Adult