Resonance frequency analysis – indicator of post-implantation morphology of mandibular bone tissue

Abstract

This article describes the role of resonance frequency analysis (RFA) as an indicator of the quality of primary implant stability, which is the basis of the goal and confirmed by the results of a clinical case – odontological implantation on edentulous segments of atrophied bone tissue on the right side of the mandible, taking into account the topographic features of its canal, using ultra-short (h = 5.5 mm) implants.
 Aim. To highlight the role of resonance frequency analysis during surgical interventions using short (ultrashort) implants in predicting their primary stability and preserving the normal morphology of the mandibular bone tissue.
 Materials and methods. The primary stability of 17 dental implants in seven patients was determined using the Penguin Instruments (RFA) technique in declarative units of measurement – the implant stability quotient (ISQ). Values in the range of 75 ISQ meant that the implant had adequate primary stability and could receive and distribute the immediate load on the bone tissue of the edentulous segment.
 Results. Following the stages of preparation, 17 ultra-short (h = 5.5 mm × b = 4.0 mm) implants were placed on the edentulous segments of the mandible without an incisional osteotomy path according to the patient rehabilitation protocol. We used the method of resonance frequency analysis to obtain a value of high primary stability of two short subcortical implants in the projection of tooth 4.7 – 92 ISQ and the projection of tooth 4.6 – 90 ISQ. On the 3rd day of the clinical stage of fixation of the supraconstruction, RFA measurements were performed, the values of which showed a significant decrease in the stability quotient of the installed implants in the projection of tooth 4.7 – 61 ISQ and in tooth 4.6 – 74 ISQ. This result made it necessary to revise the rehabilitation plan, adjust the medical prescription sheet and decide to postpone the placement of the all-milled restorative structure on the implants.
 Conclusions. The RFA study indicates not only the primary stability of implants but also a full-fledged stage-bystage clinical prognosis of the further functionality of a prosthetic structure based on short implants with proper preservation of the morphological functionality of bone tissue.