Influence of cortical bone anchorage on the primary stability of dental implants

Purpose This retrospective chart review study assessed patient records to determine implant insertion torque (IT) and implant stability quotient (ISQ) values during implant placement to evaluate the correlation with cortical bone anchorage (mono- or bicortical). Methods Primary stability data (IT du...

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Bibliographic Details
Published in:	Oral and maxillofacial surgery Vol. 22; no. 3; pp. 297 - 301
Main Authors:	de Oliveira Nicolau Mantovani, Anne Kelly, de Mattias Sartori, Ivete Aparecida, Azevedo-Alanis, Luciana Reis, Tiossi, Rodrigo, Fontão, Flávia Noemy Gasparini Kiatake
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer Berlin Heidelberg 01-09-2018 Springer Nature B.V
Subjects:	Dental implants Dentistry Medicine Medicine & Public Health Oral and Maxillofacial Surgery Original Article Product design Transplants & implants Mandible Bone anchorage Bone density Dental implants Insertion torque Implant stability Resonance frequency analysis
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Summary:	Purpose This retrospective chart review study assessed patient records to determine implant insertion torque (IT) and implant stability quotient (ISQ) values during implant placement to evaluate the correlation with cortical bone anchorage (mono- or bicortical). Methods Primary stability data (IT during implant placement surgery and ISQ values immediately after implant placement) and cone beam computed tomography of 33 patients (165 implants) were assessed. Patients were divided into the following groups: G1, implants with apical cortical bone contact; G2, implants with bicortical bone contact (apical and cervical regions); and G3, implants with cervical cortical bone contact. Results Sixty-eight implants were excluded due to cortical bone contact on regions other than implant apical or cervical. Ninety-seven implants were therefore assessed for this study. No implant failure was found after a mean 70.42-month follow-up time. Implants with bicortical anchorage (G2) showed higher IT (64.1 Ncm) during implant placement and higher ISQ values (76) ( p < 0.05). Monocortical implants (G1, apical, and G3, cervical) showed similar IT (G1 52.3 and G3 54.3) and ISQ values (G1 71.9 and G3 73) ( p > 0.05). No correlation (Pearson correlation coefficient) was found between the two stability measurement devices for the different cortical bone anchorages that were analyzed (G1 0.190, G2 0.039, and G3 − 0.027) ( p > 0.05). Conclusions Insertion torque values and implant stability quotients were influenced by cortical bone contact. No significant correlation was found between IT and ISQ values—higher insertion torque values do not necessarily lead to higher implant stability quotients.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1865-1550 1865-1569
DOI:	10.1007/s10006-018-0705-y