요즈음 문헌은 물론 구강병리학 Textbook에게까지 새로운 질환의 용어가 기제되고 있는 것 중에서 Odontogenic Carcinoma라는 이름 아래 악골에서 발생하는 암종에 대하여 기술하고 있어 이는 특히 우리 치과의사의 입장에서 기초나 임상에서 그 발생기전이나 치료면에 이르기까지 유의해야 할 문제라고 생각된다.

This study was designed to observe the marginal leakage of three permanent cements affected by three temporary cements. The temporary cements used in this study were Zinc oxide-eugenol, Non-eugenol, and Calcium hydroxide cements and the permanent cements were Zinc phosphate, Polycarboxylate and Alumina reinforced EBA cements. To measure the dye penetration into permanently cemented zone, the experimental specimens were treated with the temporary cements for a week. An analysis of the data obtained from 120 specimens resulted in the following conclusions: 1. Regardless of the types of the permanent cements used, using Calcium hydroxide cement as temporary cement showed higher marginal leakage than other temporary cements. 2. Using Polycarboxylate cement as permanent cement showed less marginal leakage than other permanent cements. 3. The marginal leakage in zinc phosphate cement was similar to Alumina reinforced EBA cement regardless of the types of the temporary cements.

The author observed a patient of ectodermal dysplasia with oligodontia. The treatments were done as follows: Vital pulpotomy and restorative treatment were done as usual method. Removable type space maintainer was set on the area of primary teeth removed. Follow-up checking were required for the observation of growth and development of the permanent teeth and the jaw.

This is to report a case of traumatic bone cyst which occurred in the left condylar head of the mandible. It is a very rare case and the prognosis after operation seems to be fair, therefore we report as follows. 1. The pt, a 49 year-old female, has been suffering from difficulties of mastication with disfiguration of face due to deviation of mandible to the right side for 20 years. 2. Histopathologic findings showed the figure of multilocular bony cysts contained with fibrous tissue, osteoid tissue and many hematopoietic cells 3. Roentgenographic features showed well circumscribed radiolucent lesion with some radiopaque area. 4. After clinical evaluation, condylectomy was done to remove the lesion. 5. After the operation, the esthetic problem and masticatory functions were improved.

Authors have treated 4 patients of Angle's class II malocclusion; which were consisted a boy aged 11years 2 months, a girl aged 11 years 4 months, a boy aged 13 years 7 months and a female aged 20 years 1 months. The results of treartment were reviewed and discussed with literatures.