Resonance frequency measurements of implant stability in viva. A cross‐sectional and longitudinal study of resonance frequency measurements on implants in the edentulous and partially dentate maxilla.

Abstract

The aim of this investigation was to evaluate the use of resonance frequency measurements in the clinical measurement of implant stability. Resonance frequency measurements are undertaken by measuring the response of a small transducer attached to an implant fixture or abutment. Two groups of patients were selected for study. Group A comprised 9 patients who had a total of 56 implants placed. Resonance frequency measurements were made at fixture installation and repeated 8 months later at abutment connection. The resonance frequency of the implant/transducer system increased for 50 out of the 56 implants from a mean value of 7473 Hz +/- 127 Hz (P < 0.05) to a mean of 7915 Hz +/- 112 Hz (P < 0.05). Two implants had failed to integrate and the resonance frequency of these had fallen. Group B comprised 9 patients who had been provided with fixed prostheses and had a total of 52 implants placed. They were examined 5 years after fixture placement and the prostheses removed. All implants were judged clinically to be osseointegrated. The level of the marginal bone around each implant was calculated by measuring the number of exposed threads on intraoral periapical radiographs and added to the length of each abutment to give a value termed the effective implant length (EIL). Measurements indicated a correlation (R = -0.78, P < 0.01) between EIL and resonance frequency. The results support the hypothesis that the resonance frequency of an implant/transducer system is related to the height of the implant not surrounded by bone and the stability of the implant/tissue interface as determined by the absence of clinical mobility.

Predictability of the resonance frequency analysis in the survival of dental implants placed in the anterior non-atrophied edentulous mandible

“…These authors, however, did not observe any significant differences in terms of ISQ values at different post-surgical times. Among three methods for the evaluation of implant stability (RFA, Periotest and insertion torque), only RFA has been correlated to bone-implant contact in experimental studies with animals (6,16). However, in the study over maxilla and mandible of human cadaver this correlation was less pronounced, probably because properties of human mandible and maxilla change rapidly in a short period of time.…”

“…RFA has been previously reported to be effective in the detection of implant failure and in the checking of the healing process (4,5). Furthermore, it has been reported the importance of cortical bone in the determination of primary stability, with a positive correlation between RFA and the height of cortical bone in experimental studies with animals (6). Correlation in the patient alive has been studied less extensively.…”

Methods of Evaluating The Dental Implant Stability

“…Osstell TM Mentor ve ISQ cihazlarının eski Osstell TM cihazından en büyük farkı ve avantajı, birçok ölçümü değişik yönlerde yapması ve sonuçta tek bir değer vermesidir. 35 Osstell kullanımı hiçbir temas içermez, probun ucu SmartPege değdirilmeden ölçüm yapılır, tamamen noninvazivdir ve hasta 1-2 saniye süren ölçüm sırasında bir şey hissetmez. Stabilite implant üzerinde ISQ değeri ile gösterilir.…”

“…Her iki değeri de ölçtüğünüzden emin olmak için birinci ölçüm için prob çene hattı ile aynı hizada tutulurken, ikinci ölçümde ise çene hattına dik olarak tutulmalıdır. 35 RFA daha önceki bir çok çalışmada yerleştirme torku ve kemik-implant bağlantısını gösteren histolojik çalışmalarla karşılaştırılmış ve sonuçların birbiri ile pozitif korelasyon gösterdiği tespit edilmiştir. 36,37,38 Rutin klinik uygulamalarda implant stabilitesinin değerlendirilmesinde objektif bulgular veren ve kullanışlı ölçüm cihazı olarak kabul edilen RFA yöntemine sıklıkla başvurulmaktadır.…”

A Resonance Frequency Technique to Monitor the Integrity of Dental Implants

“…The purpose of this paper is to describe the mechanical design of the transducer, rather than to discuss the clinical results. Details of the early clinical work can be found in [6,8,9]; the major trial currently in progress will be completed in the latter half of 1998 and will then be reported.…”