The International Journal of Oral & Maxillofacial Implants, 04/1987

Rabbit vital microscopic bone chambers were used to study acute irradiation effects on the microvasculature in bone tissue in rabbits. This in vivo technique makes it possible to study the temporal development of events in a well-defined tissue compartment. During a 4-hour observation period following 25 Gy single dose of Co60-irradiation, increasing leukocyte adherence to the venular endothelium and subsequent migration into the interstitial space was observed. The capillaries showed reduced and occasional reversal of blood flow. At no time during the entire observation period were there any signs of macromolecular leakage as studied with FITC-dextran 70 and epi-illuminescence.

The plasma flame-sprayed coatings on seven ITI-Hollow Basket Implants (types E, F, and K) and eight IMZ-Implants (Cylinder and Cylinder Extension), exfoliated in man, were analyzed metallographically and compared with nonused implants of the same types. Two thirds of the retrieved implants showed a significant decrease of the coating thickness. There was no correlation between the coating thickness reduction and the intraoral functional time. The microhardness of the ITI-Hollow Basket Implant bodies was significantly higher than that of the IMZ-Implants.

The Intramobile Cylinder (IMZ) Two-Stage Osteointegrated Implant System is unique. The IMZ Implant System incorporates a Delrin, intramobile element (IME) which simulates the periodontal ligament of the natural tooth unit. This shock-absorbing element distributes stress and functional load in a physiological manner so that the semi-edentulous patient may be reconstructed by splinting to the adjacent natural teeth. This article will discuss the IMZ Implant System, its surgical insertion, prosthetic reconstruction, and the rationale and concepts of the intramobile element. It will further review the clinical findings of 3,436 implants placed during the past 10 years in West Germany primarily, followed by the past 2 years experience in North America.

A small animal model to investigate materials and implant designs intended for use as immediate replacements for extracted teeth has been developed. The effect of biological graft materials such as mineralized bone powder, demineralized bone powder, and collagen (Zyderm) on healing in relation to an endosseous porous-coated Co-Cr alloy implant placed into an extraction socket is reported. Testing of the data by analysis of variance revealed that the use of graft material improved healing by bone significantly (P .01). The Duncan Multicomparison Test (α = .05) showed that Zyderm produced significant improved healing over the demineralized bone powder and implant alone.

The jaw myxoma is a rare odontogenic tumor. This article reviews the presentation, diagnosis, and treatment of this tumor. It also reports a case of the surgical management of the myxoma and the subsequent skeletal and dental reconstruction following tumor resection.