Morphologic and hemodynamic analysis of dental pulp in dogs after molar intrusion with the skeletal anchorage system

Yuichi Konno, Takayoshi Daimaruya, Masahiro Iikubo, Reiko Kanzaki, Ichiro Takahashi, Junji Sugawara, Takashi Sasano

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Introduction: We have successfully treated skeletal open bite by intruding posterior teeth with the skeletal anchorage system. Our aim in this study was to morphologically and hemodynamically evaluate the changes in pulp tissues when molars are radically intruded. Methods: The mandibular fourth premolars of 9 adult beagle dogs were divided into 3 groups: a sham operated group (n = 6, 3 dogs), 4-month intrusion group (n = 6, 3 dogs), and a further 4-month retention group (n = 6, 3 dogs). We evaluated the morphological changes of the pulp and dentin-the amount of vacuolar degeneration in the odontoblast layer, the predentin width and nervous continuity in the pulp tissue, and the pulpal blood-flow response evoked by electrical stimulation in the dental pulp. Results: Extreme molar intrusion with the skeletal anchorage system caused slight degenerative changes in the pulp tissue, followed by recovery after the orthodontic force was released. Circulatory system and nervous functions were basically maintained during the intrusion, although a certain level of downregulation was observed. These morphologic and functional regressive changes in the pulp tissue after molar intrusion improved during the retention period. Conclusions: Histologic changes and changes in pulpal blood flow and function are reversible, even during radical intrusion of molars.

Original languageEnglish
Pages (from-to)199-207
Number of pages9
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Volume132
Issue number2
DOIs
Publication statusPublished - Aug 1 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Orthodontics

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