224 - Prevalence of Primary Molar Ankylosis and Relationship to Demographic Factors

Purpose:

Recent study conducted at the University of Nevada, Las Vegas have evaluated the prevalence of ankylosis of primary molar. The purpose of this study is to determine the prevalence and its relationship with gender, ethnicity and crowding. Also, this aims to find out which deciduous molar shows the highest prevalence of ankylosis in the UNLV patient population.

Methods:  

The authors searched the electronic database (Axium) for subjects from Jan 2014- Dec 2022. Different data were collected after reviewing individual charts including gender, ethnicity, location of ankylosis, missing premolars, crowding and spacing. The Chi-square test was used to evaluate the significant relationship of ankylosis of primary molars to crowding, gender and ethnicity. Percentage for each ankylosed primary molar was calculated to determine which primary molar is more commonly ankylosed.

Results:

Retrospective data analysis revealed that the overall prevalence of ankylosis was found to be 10%. No significant differences between sex and prevalence of ankylosis observed when two different sex were compared (P= .512). No significant differences between different ethnicities and prevalence of ankylosis were observed (P= .300). There was significant relationship between crowding and ankylosis (P=.046). Tooth #B had highest frequency of ankylosis in maxillary arch whereas tooth #L had the highest frequency of ankylosis in the mandibular arch. 

Conclusion:

From this study, only crowding was significantly associated with ankylosis of primary molar. Primary molar ankylosis was more common in the mandibular arch. However, more study is needed to evaluate the relationship between primary molar ankylosis and demographic factors.

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