Radiographic evaluation of the effect of dental development of permanent first molars on ectopic eruption

Aim: To radiographically evaluate the relationship between ectopic eruption of permanent first molars and the level of tooth development of these teeth radiographically. Methods: In the present study a total of panoramic radiographs of 15.332 patients (6116 females, 9216 males) aged from 5 to 9 years old who attended Ondokuz Mayis University, Faculty of Dentistry was evaluated. In cases of ectopic eruption, which teeth erupted ectopically most frequently, in which gender and age it was more common, whether it exhibited symmetrical distribution, and the severity of ectopic eruption were recorded. In asymmetric ectopic eruption cases tooth development stages of both ectopicaly erupted and normally erupted teeth were compared according to the Nolla method. In addition, tooth development in cases of ectopic eruption in the mandible was also evaluated comparatively with the Cameriere method. Chi-square test and t-tests were used in the statistical analysis of the data. Results: A total of 315 cases were diagnosed with ectopic eruption, and frequency of ectopic eruption was calculated as 2,05%. Of these 54.8% of ectopic eruption cases are belong to male and 45.2% are female The difference between genders was not statistically significant (p>0,05). A total of 429 ectopic PFMs were detected and 83% (370) of them were located in maxilla and 17% (59) of them were in the mandible. The difference between the jaws was statistically significant (p<0,05). When dental development was evaluated, it was determined that a total of 205 PFMs exhibited asymmetric ectopic eruption, and the most common development score according to the Nolla method is 7 for affected and unaffected teeth. The tooth development score distributions of the DBMs in the ectopic eruption area were found to be different from the compared teeth (p<0,05). İn addition, when the Cameriere measurment resuls of the PFMs in the mandible were compared, it was determined that the measurment values of the PFMs in the ectopic eruption were higher than the unaffected side (p<0,05). Conclusion: It was observed that the tooth development of DBMs with ectopic eruption was delayed the opposing teeth on the unaffected side. It was thought that DBMs with delayed tooth development may erupt ectopically or ectopic eruption may lead to delayed tooth development. Key Words: Dental development, Ectopic eruption, Permanent first molar