بررسي شيوع رويش لينگوالي دندان هاي ثناياي دايمي فك پايين و ارتباط آن با نوع قوس دنداني در كودكان شهر كرمان

Prevalence of Lingual eruption of mandibular permanent incisors and relationship between lingual eruption and arch- form in 6-8 years old Children in kerman

Introduction: The eruption of mandibular permanent incisors lingual to retained primary incisors is often a source of concern for parents. It is seen both in patients with an obvious arch length inadequacy and in those with a desirable amount of spacing of the primary incisors. Because no statistics on prevalence of lingual eruption of mandibular permanent incisors exists, the aim of the present study was to investigate the prevalence of lingual eruption of mandibular permanent incisors and relationship between lingual eruption an arch- form in 6-8 years old children in kerman during autumn 2006. Material and Methods: In this descriptive-cross sectional study, 4278 students (%50 girl, 50% boy) were selected randomly form 50 Schools in Kerman. Data including age, sex, position of lingual eruption of mandibular permanent incisors and dental arch form were recorded and then analyzed using t and chi- square tests. Results: The prevalence of Lingual eruption of mandibular permanent incisors was 2.2%. Lingual eruption of mandibular permanent incisors in girls was significantly more than boys (p value < 0.05). Lingual eruption of mandibular permanent incisors in students with space among mandibular primary incisors was significantly more than students with an obvious arch length inadequacy (p value < 0.05). Conclusion: Lingual eruption of mandibular incisors is a common clinical problem in the early mixed dentition period. The extraction of lower primary incisors can lead to displacement of lower lingual holding arches, or referral for comprehensive orthodontic treatment. Therefore, in these subjects "the wait- and- see policy" versus "early extraction" can be considered for lingual erupting permanent mandibular incisors.