Abstract
Few studies assess repeatability and reproducibility in registers of resonance frequency analysis (a value of dental implant stability). Objective: Few studies assess repeatability and reproducibility in resonance frequency analyses (implant stability evaluation). This study is aimed at assessing reliability (repeatabilty and reproducibility) in the Osstell Mentor® system using the intraclass correlation coefficient (ICC) as the statistical method. Study Design: ISQ measurements of RFA were carried out by means of the Osstell Mentor® instrument in 58 implants in 19 patients. Six measurements were performed on each implant by means of two different Smart-Pegs (I and II). Three consecutive measurements were registered with each transducer. Results: Average ISQ varied from 72.43 to 72.60 and 73.26 in the first, second and third measurements, respectively with the SamrtPeg I and from 72.98 to 73.26 and 73.74 in the first, second and third measurements, respectively with the SamrtPeg II . Exactly equal values were observed in 10.43 and 12.1% of the cases with Smart-Pegs I and II, respectively. The intraclass correlation coefficient was 0.96 and 0.96 for Smart Pegs I and II, respectively. Repeatability and reproducibility was 0.97 for both Smart-Pegs I and II. Conclusions: The RFA system contributed by Osstell Mentor® renders almost perfect reproducibility and repeatability, as proven by statistical analysis carried out by means of ICC with 95% confidence level. This instrument contributes highly reliable RFA measurements in dental implants. Key words:Dental implants, RFA, ISQ, implant stability, Osstell.
Highlights
The rehabilitation of partially or completely toothless patients by means of implant supported prostheses is a predictable treatment (1)
Implants receive no functional load until bone and implant surface are closely jointed together, as this assures permanent implant stability throughout the stages that follow implant placement
Implant stability can be defined as the absence of clinical mobility under a specific load, which depends on the contact between implant surface and the bone surrounding the implant
Summary
The rehabilitation of partially or completely toothless patients by means of implant supported prostheses is a predictable treatment (1). The latter is the one that the implant acquires when the bone forms in direct contact with the implant surface and is determined by the process of osseointegration itself In this paradigm, the assessment of implant stability becomes very important to obtain successful and predictable bone-implant attachment. First generation transducers were constituted by an L-shaped metallic accessory made of surgical stainless steel or titanium that was coupled to (screwed on) the implant or the pillar This accessory had two ceramic pieces at the ends: the first was excited through a sinusoidal signal of variable frequency that caused the implant to vibrate. Few studies in literature either assess repeatability and reproducibility in registers taken with each of the available systems or compare obtained measures with those rendered by different generations of RFA instruments. This work is aimed at assessing the reliability (repeatability and reproducibility) of the Osstell Mentor® (Ostell AB, Gothenburg, Sweden) system
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