# A STUDY ON FACIAL BONE GROWTH OF PALATAL CLEFTS EXPERIMENTALLY INDUCED IN MICE

• 전윤식 (연세대학교 대학원 치의학과)
• Chun, Youn Sic (Department of Dental Science, Graduate School, Yonsei University)
• 발행 : 1988.09.30

#### 초록

In methods of finding causes for cleft palate, many cases have been studied by investigators using teratogenic agents. Among them, a synthetic agent known as triamcinolone acetonide (TA) was widely used. When this drug was injected into mice during palatogenesis, it induced lowered body weight and a deformed mandible. But many cases have been studied on growth changes, only of the developmental stages of the palate. Therefore, the objective of this study was to evaluate craniofacial growth in experimentally induced cleft palate mice after finishing palatogenesis namely just before birth. Normal, alcohol treated, and TA treated DDY mice were obtained at 18-days of gestation and heads were prepared for serial sectioning in the sagittal plane. The midsagittal sections were photographically enlarged (${\times}40$) and measurements made to asses the amount of growth. The obtained results were as follows. 1. The incidence of cleft palate was 41.2% when TA was injected. 2. The body weight of the cleft palate group was lower than the control group. 3. In the cleft palate group, mandibular length (H-M) was lighter than the control group. 4. In the cleft palate group, degree of staining was not distinct compared to the control group by the double staining method. 5. In the cleft palate group, anteroposterior posture of the tongue tip to facial plane (C-M) was more posterior than the control group. 6. The cause of posterior posture of the tongue tip to facial plane (C-M) in the cleft palate group, was not short and retracted tongue but the mandibular length was increased. 7. The anteroposterior relationship of hyoid cartilage to cranial base was the same in all groups.