PubMed · 6935792
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C J Nortjé. 1980. Röntgenological diagnosis.. https://pubmed.ncbi.nlm.nih.gov/6935792/
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STATEMENT OF PROBLEM: Numerous reports and surveys have been published on natural tooth abutment intrusion with implant-connected fixed partial dentures. The consensus of these publications was that the cause of intrusion was multifactorial, with causative factors such as disuse atrophy, debris impaction, impaired rebound memory, and mechanical binding. It was also believed that the process was irreversible. PURPOSE: In this article, the limitations with these theories are discussed, and two patient reports of tooth intrusion reversal are reviewed. A review of the current literature is discussed, as well as the current theory of tooth movement in response to dynamic mechanical stimulus, a brief discussion of current experimental procedures and results, and the current recommendations for reversal of intrusion.
A type III glass-ionomer cement (Vidrion F), currently used as fast-setting lining material and fissure sealant, was implanted into rat dental alveolus immediately after tooth extraction and its biocompatibility was analysed in terms of incorporation into alveolar bone in the wound healing process. Histological and histometric evaluation of trial areas adjacent to the implants showed that by week 1 the glass-ionomer granules were encircled by a conspicuous capsule surrounded by immature connective tissue. By week 3 the implants were surrounded by a less prominent fibrous capsule and most of the tested area was occupied by mature trabecular bone. By week 6 the fibrous capsule was thinner and the tested area was almost totally covered by bone, which was in close contact with the implanted material in several places. Quantitative data confirmed progressive new bone formation in parallel with a decrease in the percentage fraction of connective tissue in the trial areas around the implants. The results revealed that the tested material is biologically compatible, being progressively incorporated into alveolar bone in the wound healing process. The quantitative evaluation of alveolar wound healing around a glass-ionomer implant may provide an experimental model for future comparative studies carried out with other biomaterials.
The purpose of this investigation was to elucidate the biology of distraction osteogenesis during mandibular widening. Midsymphyseal vertical interdental osteotomies were performed in nine Macaca mulatta monkeys. After a latency period a tooth-borne appliance was activated at a rate of 0.5 mm twice a day for 7-10 days. The appliance was then stabilized for a period of 4 or 8 weeks. The distraction gap at the inferior portion of the symphysis was bridged completely by new bony trabeculae. Bone formation in the interdental area was apparently related to the surgical technique. Newly formed bony trabeculae were oriented parallel to the direction of distraction. The location of the osteotomy site with an adequate margin of alveolar bone contiguous with the adjacent teeth was necessary for the induction of the distraction osteogenesis. Disproportional movement between superior and inferior portions of the distracted segments was noted.