| THE DELAYED DEVELOPMENT OF MANDIBULAR SECOND PREMOLARS - A PITFALL FOR MISDIAGNOSIS OF CONGENITAL ABSENCE |
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| 선천 결손으로 오인될 수 있는 하악 제2소구치의 발육지연 |
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우연선, 정태성, 김신 |
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부산대학교 치과대학 소아치과학교실 |
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| Abstract |
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The congenital missing of mandibular second premolars is among the common dental anomaly in children. When a second premolar is diagnosed as congenitally missed, we should consider many factors influencing the treatment plan such as patient's age, states of roots of 2nd primary molar, degree of crowding, skeletal growth pattern, facial profile, procumbency of the incisor and lower facial height, etc. The mineralization of the second premolars begins in the majority of cases at the age of 2~2 1/2 years, but this period varies more widely than those for other permanent teeth. Also, mandibular second premolars show the greatest variations in differentiation and calcification. For this reason, aplasia of this group of teeth cannot be diagnosed at early age and with the same degree of certainty. From the clinical studies with 2 cases and some literature review on late development of second premolars, it could be summarized as follows : 1. The 2 cases showed marked delay in the development of mandibular second premolars. 2. After the crypt formation, the speed of calcification seemed nearly normal, suggesting that the delay was due to differentiation rather than calcification. 3. When one is encountered with similar conditions, it would be desirable to consider the possibility of delayed tooth development. |
| Key Words:
Mandibular second premolar, Delayed development, Congenital missing |
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