Relationship of Maxillary Midline Diastema and Impacted Supernumerary Teeth

• Main Authors: Hsin Ho, 何昕
• Other Authors: Jeng-Feng Liu
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/96494956589628405070

碩士 === 國立陽明大學 === 牙醫學系 === 105 === Midline diastema is a normal feature in mixed dentition, and the supernumerary teeth in the premaxilla is not uncommon abnormality noted at the same developmental stage. However, it is inability of a young child to tolerate the surgical procedure. The prevalence of midline diastema in school age children with impacted supernumerary tooth was compared with those without impacted supernumerary tooth in our study. In addition, to observe the change of midline diastema in children with impacted supernumerary tooth along with the growth of the age and the eruption of permanent canines. This study divided into two parts. The patients who visited the Outpatient department of Pediatric Dentistry in Taichung Veterans General Hospital from January 2002 to January 2005 were collected in the first part. Patients with two erupted maxillary permanent central incisors were included in this study. The percentage of midline diastema in school age children with impacted supernumerary teeth and without impacted supernumerary teeth were compared. Periapical radiograph of patients who visited Taichung Veterans General Hospital and diagnosed as supernumerary teeth were collected for ten years since November 1st in 2005 in the second part. In the first part, it was noted that midline diastema is not related to impacted premaxillary supernumerary teeth in school age children. Furthermore, the percentage of midline diastema was decreased with age even in school age children with impacted premaxillary supernumerary teeth. Midline diastema in mixed dentition was not simply caused by impacted supernumerary teeth and even in children with impacted supernumerary teeth, the prevelence of midline diastema was decreased with age. Clinically, if a impacted supernumerary teeth in anterior maxilla, periodically follow up of the midline diastema can be suggested if the complications such as rotation and delay eruption of permanent incisors were not seen. Extraction of the impacted supernumerary teeth may not be the only choice.