Abstract
Sufficient bone volume, as well as the bone quality characteristics are necessary prerequisites to ensure optimal mechanical stability of the implants and subsequent osseointegration. The aim of the present study was to assess the correlation between bone density values obtained by cone-beam computed tomography (CBCT), the primary stability of dental implants and the histomorphometric analysis of bone quality. Following tooth extraction, socket preservation with frieze-dried bone allograft or protein-rich fibrin (PRF) was performed on 30 patients with 30 maxillary teeth in the region from second premolar to second premolar. Four months after the procedure, CBCT was used to assess the bone density (Hounsfield units) in the area of extraction. Thirty bone samples were harvested from implant sites using a trephine drill. They were analyzed with Image J software. Immediately after placing the implant, the implant stability quotient was measured using the Osstell Idx device. The results revealed significant correlations between bone density and primary stability along the vestibulo-oral (r=0.392, p=0.032) and mesiodistal axes (r=0.407, p=0.026). Bone density also correlated strongly with the percentage of newly formed bone (r=0.776, p<0.001). Bone quality, in terms of bone density measured in CBCT and new bone formation are correlated to the primary stability of the dental implants and vice versa.
Highlights
Sufficient bone volume, as well as the bone quality characteristics are necessary prerequisites to ensure optimal mechanical stability of the implants and subsequent osseointegration
The clinical success of dental implants is dependent upon the bone quality and bone volume as well as the surgical technique used in implant placement.[1]
computed tomography scans (CT) is a well-established method for evaluation of bone quality and quantification of bone density expressed in Hounsfield units (HU).[4]
Summary
The clinical success of dental implants is dependent upon the bone quality and bone volume as well as the surgical technique used in implant placement.[1]. The long-term success of dental implants is highly dependent upon the degree of osseointegration in sufficient and healthy bone.[11,12] In the present clinical study, implant placement was performed 4 months after a socket preservation procedure with PRF as a sole grafting material or frieze-dried bone allograft Measurement of implant stability with RFA is a reliable, noninvasive method which can be used at any time after implant placement.[21] div, Bulgaria, approved the present study (ethic code: P-2230/26.04.2018). With one extraction socket each, all on the upper jaw, were included and treated in the oral surgery department of the Faculty of Dental Medicine in Plovdiv, Bulgaria. Measurements were performed independently by two investigators in all three planes – axial, sagittal and coronal, and the mean final HU values were determined (Fig. 1)
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