Journal of Japanese Society of Oral Implantology
Online ISSN : 2187-9117
Print ISSN : 0914-6695
ISSN-L : 0914-6695
Mobility of Two-Piece Apatite Implants Measured with Periotest® and Its Clinical Evaluation
Tetsuo IchikawaMasashi MiyamotoYasuyuki HorisakaYasuo OkamotoMasanobu HoriuchiNaoyuki MatsumotoHideo Yoshida
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1992 Volume 5 Issue 1 Pages 51-56

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Abstract

We investigated chronological changes in the mobility of two-piece apatite implants with a medical electric device, Periotest®, to identify the efficiency of Periotest and to establish clinical criteria for diagnosis with the device.
A total of 38 hydroxyapatite implants (APACERAM 2-Piece Implant type-S®,Pentax) were placed in the molar region of the mandible in 5 male patients and 10 female ones. They have been under observation since the fixture placement for up to five years. Almost all the implants have been in excellent condition up to the present. The implants stand alone, having no connection with any teeth; and the opposite teeth are normal.
Mobilities of the implants were chronologically measured by one examiner using Periotest. The variations of the site and direction for percussion were regulated as little as possible in each implant. In addition, we examined the influence of the length of the fixture, the diameter of fixture, and the length of abutment on the Periotest value(PTV).
The results are as follows.
1. Reproducible PTVs were obtained with the maximum variability of 1 in a series of percussions of the same implant.The PTVs within 30 days after the abutment placement ranged between -1 and -6 and the mean value of -3.5. Thereafter, they decreased slightly to the mean value of less than -4, and remained constant over the observation period. Periotest was useful in estimating the diagnosis for patients whose implants were border line in which radiography and manual testing may not be sensitive enough to detect problems. Periotest seems to provide an effective examination for the two-piece apatite implant.
2. The PTVs were affected by the length of abutment and the diameter of the fixture, and less affected by the length of the fixture. To diminish the mobility of the implant we should select a fixture with a greater diameter.

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© 1992 Japanese Society of Oral Implantology
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