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Relationship between contact time measurements and PTV values when using the Periotest to measure implant stability.

Journal article
Authors N Meredith
Bertil Friberg
Lars Sennerby
Carlos Aparicio
Published in The International journal of prosthodontics
Volume 11
Issue 3
Pages 269-75
ISSN 0893-2174
Publication year 1998
Published at Institute of Odontology
Institute of Surgical Sciences, Department of Biomaterials
Pages 269-75
Language en
Keywords Dental Abutments, Dental Implants, Diagnosis, Oral, instrumentation, Equipment Design, Evaluation Studies as Topic, Humans, Materials Testing, Osseointegration, Percussion, Reproducibility of Results, Time Factors
Subject categories Surgical research


PURPOSE: The Periotest is an electronic instrument that has been advocated for the measurement of implant stability and osseointegration. The aims of this investigation were to establish the relationship between contact time and PTV values when the Periotest was used to assess implants in vivo and in vitro, and to investigate the influence of the striking height of the Periotest handpiece and the length of implant abutment. MATERIALS AND METHODS: The accelerometer signal from a Periotest was captured and compared with the resulting PTV value. In vitro measurements of PTV and contract time were performed on a 3-mm abutment that had been attached to a 15-mm implant luted into an aluminium block, and were repeated on a patient in vivo. further measurements were made of the abutments of six implants in turn in the maxilla of the same patient. The standard abutment lengths on the implants were 3, 4 (x 2), 5.5 (x 2), and 7 mm. RESULTS: The results indicated that there was a linear relationship between contact time and PTV value for implants measured in vitro and in vivo. Greater scatter of the in vivo data was attributed to test and patient variables including striking position, distance, and damping as a result of the presence of soft tissue. There was a linear relationship between the PTV value and the striking height for implant measurements in vivo and in vitro. CONCLUSION: It can be concluded that the sensitivity of the Periotest to clinical variables including striking heights and handpiece angulation limit the application of the instrument as a clinical diagnostic aid to measure implant stability.

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