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Assessment of dental implants stability in areas previously submitted to maxillary sinus elevation
EAO Online Library. Zenobio E.
Oct 9, 2018; 232779
Elton Zenobio
Elton Zenobio
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Abstract
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Dental implants have become a predictable treatment modality that has been widely used in the rehabilitation of edentulous areas. The primary stability achieved shortly after implant installation is a prerequisite for the success of osseointegration, as well as one of the main factors that influence the survival rates of the implants.This study aimed to compare the primary and secondary stability, measured by Resonance Frequency Analysis (RFA), in implants of different lengths installed in areas submitted to maxillary sinus lift. Correlation between RFA and implant insertion torque was also assessed. The study was approved by the Research Ethics Committee (CAAE 53955215.0.0000.5137).**Twenty implants of 9 and 11 mm were inserted in areas submitted to maxillary sinus lift. The insertion torque was measured by the Bien Air® motor. Osstell®, through RFA, determined the ISQ (Implant Stability Quotient) at two times- the day of implant installation (T1) and 90 days after implant installation (T2). A D'Agostino-Pearson normality test showed that the data of the variables Implant Stability Quotient (ISQ) and insertion torque have a normal distribution. The paired t-test was performed to assess the existence of differences in ISQ between T1 and T2.A Student's t-test was performed to assess any differences in ISQ between the 9 mm implants and the 11mm implants. The Pearson correlation test was used to evaluate the existence of a correlation between ISQ and insertion torque in T1. **No differences were observed in the ISQ between T1 and T2 when the 20 implants were grouped, nor when the 9 mm implants were evaluated separately. In contrast, when the 11 mm values ​+​+were evaluated separately, the ISQ was significantly higher in T2 than in T1 (p <0.05). In T1, 9 mm implants had a higher ISQ than 11 mm ones (p <0.05), whereas in T2 the implants of 11 mm showed a higher ISQ than the 9 mm implants did (p <0.05). There was no difference in insertion torque between 9 and 11 mm implants (p> 0.05), nor was there a correlation between ISQ and insertion torque (p> 0.05). Longer implants (11 mm) presented a significant increase in ISQ values ​+​+during the healing period when installed in areas previously submitted to maxillary sinus lift. This phenomenon was not observed for shorter implants (9 mm). Finally, no correlation was observed between ISQ and insertion torque. Previous reports tried to demonstrate a correlation between ISQ and insertion torque, however, it must be taken into account that RFA and insertion torque represent distinct characteristics.
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