Online ISSN: 2515-8260

Keywords : Hypodontia

Prevalence And Patterns Of Third Molar Agenesis Among Three Major Ethnic Groups In Malaysia And Its Association With Agenesis Of Other Teeth

Dr. Ramesh Kumaresan; Dr. Navaneetha Cugati; Dr. Priyadarshini Karthikeyan; Dr. Neeraja Turagam; Dr Ravi Shankar Babu Y; Dr. Durga Prasad Mudrakola; Dr. Mandava Deepthi

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 7, Pages 5235-5254

Background: The third molar (M3) tooth is of clinical interest to different specialties in dentistry. Being the last tooth to develop in the human dentition it is also the most commonly malformed teeth. The agenesis of the third molars is linked to the evolution and growth of the human jaw and is also associated with other dental anomalies and has significance from evolution point of view.
Objective:The objective of this study was to establish the prevalence and distribution of M3 agenesis among the three major ethnicities of Malaysian population and to evaluate its association with hypodontia of other teeth.
Materials & Methods:Panoramic radiographs of 1514 Malaysian children were examined for the presence or absence of M3 and other class of teeth. The frequency of M3 agenesis was calculated by ethnic group, gender, tooth location along with its association with hypodontia of other teeth. Comparison between groups was done using the Chi-square test at a level of significance of 0.05
Results:The prevalence of one or more M3 agenesis in Malaysian population was 20.1%. The prevalence of M3 agenesis was highest among the Malaysian Malays (22.6%) compared to the Chinese (21.3%) and Indians (17.2%). Agenesis of M3 showed an overall greater predilection for the maxillary arch (21%) than the mandibular arch (17.1%). Patients with M3 agenesis were more prone to have hypodontia of other teeth (15.36%) when compared to patients who have third molars (4.06%).
Conclusion:Malaysian Malays and Chinese had a higher prevalence of M3 agenesis than Malaysian Indian. Hypodontia of other teeth was more prevalent in patient with M3 agenesis, hence, proving an inter-relationship between M3 agenesis and hypodontia among other class of teeth.


Naz Fathima Raj Mohamed; Gifrina Jayaraj; Yuvaraj Babu

European Journal of Molecular & Clinical Medicine, 2020, Volume 7, Issue 1, Pages 3224-3238

Tooth agenesis or congenital tooth absence is the absence of development of at least one permanent tooth and a common dental anomaly in man. Hypodontia may occur either as part of a syndrome or as a non-syndrome developed by MSX 1 and PAX 9 are causative genes co-expressed in dental mesenchymal resulting in early developmental arrest of the developing tooth. As compared with permanent dentition, the prevalence of hypodontia in primary dentition is found to be very small. Most commonly missing tooth is a third molar. Most commonly missing tooth is a third molar. It is evident from the literature that the etiology of hypodontia is varied, and genetic, epigenetic, and environmental factors that contribute. Research has suggested that clinical hypodontia management requires careful planning across multidisciplinaires.