Abstract
Objectives. Insufficient cortical bone volume when placing implants can lead to lack of primary stability. The use of cement as a bone fill material in bone defects around dental implant could result in better clinical outcome. HA has shown excellent biological properties in implant dentistry. The purpose of this study was to evaluate the effect of nanohydroxyapatite powder (Nano-HA) in combination with accelerated Portland cement (APC) on implant primary stability in surgically created circumferential bone defects in a bovine rib in vitro model. Materials and Methods. Sixteen bovine rib bones and thirty-six implants of same type and size (4 mm × 10 mm) were used. Implants were divided into six groups: no circumferential bone defect, defect and no grafting, bone chips grafting, Nano-HA grafting, APC grafting, and Nano-HA mixed to APC grafting (Nano-HA-APC). Circumferential defects around the implants were prepared. The implant stability quotient (ISQ) values were measured before and after the grafting. Results. APC exhibited the highest ISQ values. A significant increase of ISQ values following the grafting of Nano-HA-APC (18.08±5.82) and APC alone (9.50±4.12) was achieved. Increase of ISQ values after 72 hours was 24.16±5.01 and 17.58±4.89, respectively. Nano-HA grafting alone exhibited the least rise in ISQ values. Conclusions. Nanohydroxyapatite silicate-based cement could improve the primary stability of dental implants in circumferential bone defect around implants.
Highlights
Primary stability is defined as the degree of the mechanical anchoring established when placing an implant
While increase in implant stability quotient (ISQ) values after accelerated Portland cement (APC) grafting was compared with Nano-HA-APC grafting, the increase in ISQ values was not significant (P = 0.097)
Increasing of ISQ value in the period of 24–72 hrs was dissimilar in the groups. (The difference between ISQ 2 and ISQ 3 was 6 for APC and 8 for Nano-HA-APC.) It seems that this difference would be related to incorporation of nanoparticles in the Nano-HAAPC cement
Summary
Primary stability is defined as the degree of the mechanical anchoring established when placing an implant. High primary stability is critical for a successful osseointegration of dental implants [1]. Insufficient cortical bone volume when placing implants can lead to lack of primary stability. Using a bone graft material around the arranged implant beds was suggested as a technique to overcome insufficient primary stability of the dental implant [6]. Fixation (or in other words primary stability) understood as the mechanical anchoring right after placing an implant. The aim of this study was to evaluate the effect of nanohydroxyapatite powder (Nano-HA) in combination with APC on implant primary stability in surgically created circumferential bone defects in a bovine rib in vitro model
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