IADR Abstract Archives

A Comparison of Treatment Changes of Upper Second Molar Extraction

Objectives:The purpose was to evaluate the dentofacial changes in the patients treated with maxillary second molar extraction as compared to the changes in those with maxillary and mandibular first premolar extraction and non-extraction treatment. Methods:The sample consisted of 55 growing patients with fully erupted maxillary second molars, less than 6.0 mm of crowding, and similar pretreatment age. All the subjects showed favorable dentition and profile after the orthodontic treatment. They were divided into 3 groups. Group 1 consisted of 16 subjects,treated with maxillary second molar extraction. Group 2 consisted of 19 subjects, treated with maxillary and mandibular first premolar extraction. Group 3 consisted of 20 subjects, treated with nonextraction. Results:Treatment duration was shorter in the Group 1, but there was no significant difference among the 3 groups.The antero-posterior skeletal changes and the vertical skeletal changes were not significantly different between the Group 1 and the Group 2 or 3. Lip protrusion decreased in all the groups after the treatment. The changes were significantly larger in the Group 2, while there was no significant difference between the Group 1 and 3. In the Group 2, upper and lower incisors were retroclined significantly as a result of premolar extraction compared to the Group 1 and 3. Upper incisors were also retroclined more in the Group 1 than in the Group 3, but the difference was not statistically significant. Lower incisors were proclined as a result of non-extraction treatment in the Group 1 and 2. Conclusions:the changes of dentition and soft tissue after second molar extraction treatment were different from those of non-extraction and premolar extraction treatment.Upper second molar extraction treatment may be considered in the patients who require extraction therapy, if patient shows well formed crowns of upper third molars and need little changes of facial profile

Korean Division Meeting
2003 Korean Division Meeting (Seoul, South Korea)
Seoul, South Korea
2003
P-18
Korea 2003 Submissions
Oral/Poster Presentations