1. He is cutting his permanent teeth.

2. Enamel erosion is permanent tooth damage and is easily misdiagnosed with attrition due to physical effect and enamel decalcification due to bacterial nature.

3. Young permanent tooth and deciduous tooth which have high pulp horn.

4. Treatment of congenital missing of permanent tooth is often complicated by delayed diagnosis or inadequate treatment.

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5. Objective : To study the anatomic morphology of permanent tooth external layer of Korean - nationality.

6. Conclusion: Bone remodel around the permanent tooth germ resulted from primary tooth orthodontic movement.

7. The permanent tooth germ plays an important role in physiological root resorption of deciduous tooth, but not the alone factor.

8. Root resorption of deciduous tooth without permanent tooth germ was significantly delayed than the deciduous tooth with permanent tooth germ.

9. MEHTODS: By immunohistochemistry, SHIP expression was examined in the tissue membrane , alveolar bone, permanent tooth germ.

10. Root canal filling pastes for primary tooth have to meet more needs than paste for permanent tooth, such as being absorbed with root simultaneously and doing no harm to permanent tooth germ.

11. RESULTS: SHIP positive signals were observed in the osteoclasts, odentoclasts and enamel of permanent tooth germ.