4. 과잉치 치낭의 63%에서 점액성 변화를 나타냈으며 38%에서 치성세포 잔존을 보였다.
위 결과로 미루어 볼 때 과잉치 주변에서 높은 빈도로 퇴축 치성상피세포가 관찰되는 것은 낭종으로 발전될 높은 잠재성을 나타내고 있으며 또한 치주인대로 분화된 양상과 단핵세포의 관찰은 매복된 과잉치가 더욱 깊이 매복될 가능성을 나타내므로 과잉치의 외과적 발치를 결정할 때 이러한 점을 고려해야 한다.
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핵심되는 말 : 매복, 과잉치, 치낭, 현미경학적인 소견
[영문]
Supernumerary teeth are frequent disease which can cause functional and esthetic problems on neighboring teeth and peridontal tissue. But the etiologies of development of supernumerary teeth are still unknown but development of third
dental lamina and separation of permanent tooth bud are believable.
Many reports have been written on supernumerary teeth but they were focused on frequencies, treatments and locations. Few document can be found on histopatholocial studies of the supernumerary teeth.
This study contains light microscopic observations of impacted supernumerary teeth which were surgically extracted from patients age from 5 years to 11 years.
Pathohistological studies may compare the structures of supernumerary tooth to other permanent tooth and deciduous tooth, also may find the causes of complication to neighboring tooth.
Following results were made;
1. Reduced enamel epithelium was observed on 38% of supernumerary teeth and 13% had cystic change.
2. Forty six percentage of supernumerary teeth showed replacement resorption. They were observed on crown and root portion and replaced with dentinoids and calcified materials.
3. Monocytes were observed on 19% of dental follicle and 19% had periodental ligament differentiation .
4. Myxoid changes occured on 63% of dental follicle and odontogenic cell rests were observed on 38% of dental follicle.
From these results, reduced enamel epithelium frequently has high potential on causing cystic changes. Monocyte infiltration and PDL differentiation may drift mesiodens into deeper portions therefore early extraction of supernumerary teeth is considered.