Calcified Tissue Research

, Volume 2, Issue 1, pp 229–236 | Cite as

Resorption of cementum by cementocyte activity (“Cementolysis”)

  • Leonard F. Bélanger
Original Papers

Abstract

Cementum resorption (“cementolysis”) comparable to osteocytic osteolysis and concomitant with cementocyte maturation has been observed in alpharadiographs of rat molars. This phenomenon was enhanced by administration of parathyroid extract (Para-Thormone, Lilly) and retarded by feeding a diet containing 1% MgO for 48 days.

3H-thymidine-labeled rats have shown cells with radioactive nuclei at the cementodentinal junction 3 days later and none thereafter, pointing to a turnover of young cementum comparable to that of trabecular bone.

Key words

Tooth (teeth) Cementum Resorption (“Cementolysis”) 

Résumé

L'existence d'un phénomène de résorption comparable à l'ostéolyse péri-ostéocytaire au niveau des cementocytes adultes du rat a été mise en évidence par l'alpharadiographie. Cette «cémentolyse» a été stimulée par l'administration d'extrait parathyroîdien et retardée chez des rats dont la diète contenait 1% de MgO.

La thymidine tritiée a été retrouvée par radioautographie dans des noyaux de cellules situées à la jonction cément-dentine, 3 jours aprés l'injection, démontrant ainsi un «turnover» du cément des jeunes rats, comparable à celui de l'os trabéculaire.

Zusammenfassung

Eine Resorption des Zements („Zementolyse”), vergleichbar mit einer durch Osteocyten verursachte Osteolyse, und begleitet von einer Zementocytenreifung wurde anhand von Alpha-Radiographien von Rattenbackenzähnen beobachtet.

Dieser Vorgang wurde durch Verabreichung von Parathyroid-Extrakt (Para-Thormone, Lilly) gesteigert und durch 48tägige Verfütterung einer 1% MgO enthaltenden Diät verlangsamt.

Ratten, die mit3H-Thymidin markiert sind, zeigten Zellen mit radioaktivem Nuclei an der zemento-dentinalen Übergangsstelle, und zwar nur nach 3 Tagen — später nicht mehr. Dies weist auf einen Umsatz von jungem Zement hin, ähnlich jenem der Knochenbälkchen.

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Copyright information

© Springer-Verlag 1968

Authors and Affiliations

  • Leonard F. Bélanger
    • 1
  1. 1.Department of Histology and Embrylogy, Faculty of MedicineUniversity of OttawaOttawa 2Canada

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