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Clinical evaluation of the stability of implants placed at different supracrestal levels

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      The aim of this study was to evaluate the stability during healing and before loading of implants placed at two different supracrestal levels according to their collar texture.

      Materials and Methods:

      This retrospective study included patients who received posterior implants with the same macro design. Implants with a machined collar were placed 0.3 mm above the crestal bone (M group), while those with a laser-microtextured collar were placed 1 mm above the crestal bone (L group). All implants healed in a single stage with healing abutments. Implant stability quotient (ISQ) values were determined using resonance frequency analysis immediately after implant placement during surgery and after 1, 4, 8, and 12 weeks after surgery. Other evaluated factors for stability included the implant diameter and length and the site of placement (maxilla or mandible).


      In total, 103 implants (47 L, 56 M) were evaluated. The median ISQ values at baseline and 1 week after placement were significantly higher for the M group than for the L group (p=0.006 and p=0.031, respectively). There were no differences at the subsequent observation points. The ISQ value was higher for wide-diameter than regular diameter (p=0.001) and mandibular implants than maxillary implants (p=0.001 at 0-8. weeks; p=0.012 at 12 weeks) at all observation points. When diameter data were neglected, the implant length did not influence the ISQ value at all observation points.


      Our results suggest that submerging implant more inside bone may only influence primary stability. Moreover, the implant diameter and site of placement influence primary and secondary stability before loading, whereas the implant length does not when its diameter is not accounted for.

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      Most cited references 27

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      Quantitative determination of the stability of the implant-tissue interface using resonance frequency analysis.

      Bone anchored implants are now being used in dentistry for supporting intraoral and craniofacial prostheses. Although high success rates have been reported, a small number of implants may fail during the early healing phase or lateral in function. Currently available clinical methods to determine implant stability and osseointegration are relatively crude and may entail percussing a fixture with a blunt instrument. Radiographs are of value, but a standardised technique is necessary to ensure repeatability. This investigation was designed to study the application of a non-invasive test method using resonance frequency analysis to make quantitative measurements of the stability of the implant tissue interface in-vitro and in-vivo. The resonance frequency of a small transducer was measured when attached to implants embedded at different heights in an aluminum block. A strong correlation (r = 0.94, p < 0.01) was observed between the observed frequency and the height of implantation fixture exposed. The change in stiffness observed in the bone surrounding an implant during healing was modelled by embedding implants in self-curing polymethylmethacrylate and measuring the resonance frequency at periods during polymerisation. A significant increase in resonance frequency was observed related to the increase in stiffness. Resonance frequency measurements were also made on implants in-vivo and the results correlated well with the in-vitro findings.
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        Assessment of implant stability as a prognostic determinant.

         N Meredith (2019)
        This paper aims to establish the parameters necessary to monitor successful implant placement and osseointegration.
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          Implant stability measurements using resonance frequency analysis: biological and biomechanical aspects and clinical implications.


            Author and article information

            [1 ]Department of Oral Implantology Faculty of Dentistry Istanbul University Turkey
            [2 ]Department of Periodontology Faculty of Dentistry Bezmialem Vakif University Turkey
            [3 ]Department of Prosthodontics Faculty of Dentistry Istanbul University Turkey
            Author notes
            [* ]To whom correspondence should be addressed: Dr. B. Alper Gultekin eduDepartment of Oral Implantology Faculty of Dentistry Istanbul University 34390, Capa-Fatih/Istanbul Turkey Phone: +90 212 414 20 20 (ext:30429) alpergultekin@
            J Istanb Univ Fac Dent
            J Istanb Univ Fac Dent
            J. Istanbul Univ. Fac. Dent.
            Journal of Istanbul University Faculty of Dentistry
            Istanbul University Faculty of Dentisty (Istanbul, Turkey )
            01 October 2016
            : 50
            : 3
            : 21-31
            28955572 5573511 10.17096/jiufd.96003 jiufd-50-3-402
            Copyright © 2016 Journal of Istanbul University Faculty of Dentistry

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            Biological Sciences


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