TREATMENT OF CLASS I CROWDING WITH EXTRACTION OF THE SECOND PERMANENT MOLAR

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Journal of the Korean Academy of Pediatric Dentistry 2001;28(3):421-429.
Published online August 31, 2001.

TREATMENT OF CLASS I CROWDING WITH EXTRACTION OF THE SECOND PERMANENT MOLAR

제2대구치 발치를 이용한 Class I crowding의 치험례

박성용, 최남기, 양규호

전남대학교 치과대학 소아치과학교실

Abstract

Since Non-Extraction treatment in some orthodontic case shows unstable result and unfavorable profile, extraction is selected as inevitable treatment option for the harmonious profile, facial skeleton, and the stable dentition on both arches. For the achievement of proper goal, premolars, molars, sometimes incisors or canines are selected to be extracted. The first Premolar is usually extracted for relieving the crowded dentition with which the molar relations are class I to gain stable dentition and proper profile, but often results in the depression of profile or the loss of vortical dimension. On the contrary, the extracton of the second molar helps maintaining the fullness of profile and the vertical dimension, prevents additional space closural procedures which often make the procedures complicated, relieves both anterior and posterior crowding, and substitutes the extraction fossae for newly erupting 3rd molars. From the point of recurrence, the second molar extraction procedure, therefore, is more beneficial. This cases showed the good results of second molar extraction procedures in the patients with class I crowding.

Key Words: Extracton, Non-extracton, The second molar