乳牙蛻換期牙髓組織變化之組織學研討

Histological Study of the Change of Pulp Tissue During Shedding of the Deciduous Tooth

陳弘森(Horng-Sen Chen)

《The Kaohsiung Journal of Medical Sciences》 8卷2期 (1992/02) Pp. 96-107

https://doi.org/10.6452/KJMS.199202.0096

摘要

為了要了解乳牙在蛻換過程中所伴隨之牙髓變，由吸收開始期至完全被吸收時期，總共收集120顆無齲齒或病變之乳牙，並參考Moorress等人和Haavikko之分類法，將乳牙牙根吸收程度，分成五級如下：Res. 1／4, Res. 1／2, Res.3／4, Res. Co.。將牙齒拔出後，依常規方法作蘇木紫─伊紅染色(hematoxylin and eosin stain)，Masson’s stain及銀染色(silver stain)，以光學顯微鏡觀察，獲得以下的結論：⑴正常牙髓維持其正常機能，當牙根被吸收在1／2以上時，牙髓常見類似炎性變化，且具有內部吸收(internal resorption)作用。 ⑵當乳牙牙根完全被吸收，脫落之前，牙髓腔內部即不再有正常牙髓組織相。 ⑶乳牙牙神經組織在牙根被吸收初期即發生變性，顯示牙神經對牙根吸收作不具影響力。 ⑷乳牙脫換時所產生的牙根被吸收現象，毀牙細胞(odontocla-sts)扮演著主要角色，另外一些巨噬細胞 ，亦有參予。

並列摘要

To understand the pulp change of root resorption of human deciduous teeth from a histological point of view, one hundred and twenty specimens were collected for study.
The teeth (caries-free) were extracted for occlusal reason or because they exhibited various degrees of mobility and discomfort. The extent of root resorption was classified into five grades: Res. i, Res. 1／4, Res. 1／2, Res.3／4, Res. Co., according to Moorrees et al. and Haavikko.
All teeth were fixed in 10% formalin (pH7.2) immediately after extraction for 3-7 days. They were then decalcified for 14 days in 5% formic acid-sodium citrate, sectioned serially at 7 μm and stained with hematoxylin and eosin, Masson's stain, and silver impregnated stain. All sections were examined under a light microscope.
The results obstained were as follows: 1.While the root was resorbed more than one half way, some normal pulp was replaced by the connective tissue as in inflammation. Internal resorption could be seen. 2.By the time deciduous root resorption was essential as complete, normal pulp tissue was no longer present. 3. Because the nerve degenerated furing initial tooth resorption, there was no evidence that deciduous root resorption aws under ner-vous control. 4.The present observation suggests that in addition to odontoclasts, several other cells such as fibroblast-like cells and macro-phages, were actively involved in root resorption during the shedding of deciduous teeth.

並列關鍵字

tooth ； root resorption ； pulp tissue