Morris H F, Winkler S, Ochi S
Dental Implant Clinical Research Group at the VA Medical Center in Ann Arbor, Mich 48105, USA.
J Oral Implantol. 2000;26(4):291-9. doi: 10.1563/1548-1336(2000)026<0291:TAEDIA>2.3.CO;2.
Osseointegration is an ongoing histometric process that may vary during clinical function. The implant must be stable at uncovering, which reflects the status of bone-implant interface. The physiology of bone healing associated with endosseous implants suggests that this process occurs between 8 and 12 months, and Periotest values (PTVs) tend to reflect changes in the stability of the bone-implant interface. Stability generally increases gradually from the time of uncovering to an optimal PTV that occurs at a point close to 12 months. This stable interface must remain intact for long-term clinical survival. Rapid development of this optimal PTV is highly desirable in order to prevent premature overloading of the bone-implant interface. The Ankylos implant is a new screw-type implant design in which the thread pitch and length vary to maximize trabecular bone contact. The purpose of this report is to evaluate to 18 months the stability (PTVs) of this implant design. More than 457 implants were placed and followed for a period of 18 months by the multicentered, multidisciplinary Ankylos Implant Clinical Research Group (AICRG). Implant stability (PTVs) was assessed using the Periotest at abutment connection and at 3, 6, 9, 12, and 18 months after uncovering. The Periotest values for all implants rapidly reached an optimal status between uncovering (-3.1 PTVs) and 3 months (-3.4 PTVs). This rapid increase in stability has not previously been reported for other implant designs. The mandibular arch was more negative (-3.8 PTVs) at uncovering as compared with the PTVs for the maxillary arch (-1.7 PTVs). Negative PTVs were recorded (1) as length and diameter increased, (2) as bone density increased, (3) in certain jaw regions, (4) as the number of implants/case increased, and (5) for implants stabile at placement. The Ankylos screw implant design produced rapid stabilization 3 months after uncovering.
骨结合是一个持续的组织计量学过程，在临床功能期间可能会有所不同。种植体在暴露时必须稳定，这反映了骨-种植体界面的状态。与骨内种植体相关的骨愈合生理学表明，这个过程发生在8到12个月之间，而Periotest值（PTV）往往反映骨-种植体界面稳定性的变化。从暴露时到接近12个月时出现的最佳PTV，稳定性通常会逐渐增加。为了实现长期临床存活，这个稳定的界面必须保持完整。为防止骨-种植体界面过早过载，非常希望能快速形成这种最佳PTV。Ankylos种植体是一种新型的螺旋型种植体设计，其螺距和长度各不相同，以最大限度地增加与小梁骨的接触。本报告的目的是评估这种种植体设计在18个月内的稳定性（PTV）。多中心、多学科的Ankylos种植体临床研究组（AICRG）植入了457颗以上的种植体，并对其进行了18个月的跟踪。在基台连接时以及暴露后3、6、9、12和18个月时，使用Periotest评估种植体稳定性（PTV）。所有种植体的Periotest值在暴露时（-3.1 PTV）到3个月时（-3.4 PTV）迅速达到最佳状态。其他种植体设计此前尚未报道过这种稳定性的快速增加。与上颌弓的PTV（-1.7 PTV）相比，下颌弓在暴露时的数值更负（-3.8 PTV）。记录到负的PTV情况如下：（1）随着长度和直径增加；（2）随着骨密度增加；（3）在某些颌骨区域；（4）随着种植体数量/病例增加；（5）对于植入时稳定的种植体。Ankylos螺旋种植体设计在暴露后3个月产生了快速稳定。
