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BONE EVALUATION FOR CRANIOFACIAL IMPLANT PLACEMENT-MICRO CT ASSESSMENT OF MICROARCHITECTURAL PARAMETERS
2nd International Conference on DENTISTRY AND ORAL HEALTH
April 15-16, 2019 | Milan, Italy
Filip Ivanjac, Vitomir Konstantinovic, Marija Duric and Aleksa Janovic
Belgrade University, Serbia
Posters & Accepted Abstracts : J Clin Dentistry Oral Health
Abstract:
Introduction: The most important factor for successful implant therapy is good implant stability in the bone
tissue. It is equally important for every type of implants, so EO (extra oral), craniofacial implants are not an exception.
To achieve satisfactory implant stability bone tissue quality is one of the most important factors. Bone
quality is determined by its microarchitectural parameters.
Aim: The aim of this study was to evaluate bone tissue microarchitectural parameters in targeted points for
craniofacial implant placement.
Methodology: Micro CT method was used on cadaver model to determine optimal localisation for implant
placement based on the bone density. Implant placement points were periorbital, perinasal and the auricular
region. Each bone sample was scanned in dry state at a resolution of 10μm using micro computerized tomography
(Sky Scan 1172 x-Ray Micro tomography, Sky Scan, Kontich, Belgium). Acquisitions were performed on
85kV voltages, 118μA pipe current, 1000ms time exposure, 0.5mm thick aluminium and copper filter, and 180
° rotation. The obtained images were reconstructed using NRecon v.1.6.9.8 software with a beam hardening
correction of 25%, a ring artefact with a correction of 18%, and a reduction of two. The images were then analyzed
using CTAn 1.14.4.1 software. The parameters of the microarchitecture of the cortical bone that were
measured included: cortical thickness (Ct.Th mm), cortical porosity (Ct.Po,%), pore diameter (Po.Dm mm), and
pore separation (Po.Sp mm).
Results: According to Micro CT at the glabella region, the smallest porosity of the cortical bone was determined
(Ct.Po 4,13mm), the largest pore separation (Po.Sp. 0,49mm), and the smallest pore diameter (Po.Dm.0,09mm),
the cortical thickness also showed high values (1,49mm) and high implant stability values for disc implants.
The highest (Ct.Th 2,72mm) was found at the Zygomatic region. Also, in the orbital region the thickness of the
cortex was very high (Ct.Th.1, 89mm), although the porosity of the cortical bone was somewhat higher (Ct.
Po. 6, 72). By examining the microarchitecture of the cortical bone at localizations: Orbital bone, glabella and
peripheral region of the aperture piriformis, maxillary process of the zygomatic bone and the qualitative value
of bone tissue in these localizations was optimal for insertion of the disc implants. The mastoid part of the temporal
bone in the control group showed the smallest thickness of the cortical bone (Ct.Th.1, 25mm) and also a
small porosity (Ct.Po. 4, 30mm) that justified the use of the screw implants.
Conclusion: Bone quality parameters were satisfactory on implant insertion localisations. Every implant type
was adequate in shape and size for the intended localisation and its bone microarchitectural parameters.
Biography:
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