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ePaper created 2016-03-11, 23:13:06 | version 1.38.0
issue 2016 — 79 Periodontics Article analyzingsecondaryorbiologicalstability. ISQ is a reliable method for implant fol- low-up and the initial base value should be recorded in order for the clinician to have areferenceformaintenancepurposes.Im- plant failures are occasionally difficult to diagnose and the comparison against the initial ISQ value can be a useful approach to assessing risk of implant failure. Analysisoftheassociationbetweenthe ISQvaluesontheimplantandontheabut- mentindicatedalinearpatterninthedata, as the linear correlation coefficient was 0.68. However, a significant difference was observed in terms of the mean ISQ value measured on the implant and on the abutment (p < 0.05), with the highest val- uesobservedontheimplant.Manystudies have demonstrated that implants with a high initial ISQ value (> 60) are often suc- cessfully osseointegrated12, 23 and tend to perform well clinically in the long term. Sennerby and Meredith state that low ini- tial ISQ values that continue to decrease as healing progresses may be a sign of im- plant failure.23 Glauser et al. report an im- plant failure rate of 11.2%.9 The implants with an initial ISQ value of higher than 69 had a 100% success rate, while those with an initial ISQ value of between 48 and 59 had an average failure rate of 19%, and 100% of the implants with an initial ISQ value of lower than 39 failed. No studies were found that compared ISQ on the implant and the abutment at the same surgical intervention, which was theapproachchoseninthisstudy.TheISQ values for each implant and abutment were very far apart, despite the results showing a linear pattern between them. ThisfindingcomplicatestheuseofRFAon implants where an abutment is torqued in the same session as the implant, since re- moval of the abutments torqued during the osseointegration period is not indi- cated. Therefore, when the ISQ value for an implant at the time of placement is less than 60, an abutment should not be torqued during the same session,9 since suchascenariocontraindicatesimmediate loading. Measurements at the implant level are regarded as the most accurate approachesto definingthe loading proto- col foranyparticularprosthesis; however, measurements at the abutment level could be the safest way to follow up on dental implants, since premature abut- ment removal could result in implant fail- ure.Becauseofthelinearcorrelationiden- tified between both measurements, abutment ISQ orimplant ISQ values could be used equally. Based on the results presented in this study, less accuracy was observed in the measurement of ISQ when the abutment was seated in the same surgical session, which is essential for immediate loading. Owing to the lack of studies using the same methodology, further investigation is needed in order to develop methods that are more accurate for evaluation of ISQ on abutments. In addition, studies comparing RFA on implants and abut- ments of different implant systems would be desirable. Therefore, it can be con- cluded in the present study that no asso- ciation was found between the measure- ments of placement torque and RFA. Additionally, a statistically significant dif- ference was identified between the im- plant and abutment ISQ measurements. Editorial note: A list of references is available from the publisher. Fig. 5 Association analysis between the measurements ISQ on implant vs. ISQ on abutment. Article_Saletti_00-00.qxp_Layout 1 02.03.16 20:53 Seite 4 Article_Saletti_00-00.qxp_Layout 102.03.1620:53 Seite 4