Mean Eruption Ages and Emergence Sequences of Permanent Mandibular first Molar and Central Incisor in local population of Lahore, Pakistan

Abstract

Objective: To find out the mean eruption age and emergence sequence of permanent Mandibular first molar and central incisor in local population of Lahore, Pakistan.

Background: Mandibular first molar and central incisors are the first permanent teeth that erupt in mouth. The timing of these teeth is useful to determine early or delayed eruption. It also helps in prophylactic measures, as water fluoridation. Useful in pediatric dentistry e.g. as one of the milestone, orthodontic dentistry, for diagnosis of certain growth disturbances. Useful in forensic dentistry for estimation of age, developmental differences and similarities  among populations. This study standard may ensure international comparability to assist clinicians.

Study Design:  Cross-sectional  

Place and Duration of Study: This study was conducted at the Department of Oral Biology, KEMU, Lahore from 1^st March 2010 to 15 January 2011

Materials and methods: Four thousand primary school children of both genders aging between 5-9 years were examined. Ethical permission was obtained. Consent was obtained. Emergence of teeth was noted in three anatomical stages. Teeth were noted by two-digit system of FDI (Federation Dentaire Internationale), on Performa. Statistical analysis was done by SPSS version 13.

Results: In male mean eruption age of Lower Central Incisor was 7.29 years with emergence range of 6.75- 8.14 years. Whereas Lower First Molar was 6.93 years, with range of 6.46–7.93 years. In female mean eruption age of Lower Central Incisor was 6.84 years, with emergence range of 6.08- 7.48 years. And of Lower First Molar was 6.87 years, with range of 6.75 – 7.32 years. P-value less than 0.05 was assumed significant. 

Conclusion: Mandibular central incisor & first molar eruption ages are later in both genders compared to Western standards used in our clinical and basic sciences.