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1
المؤلفون: Meetal Dave, Jonathan Davies, Ron Wilson, Richard Palmer
المصدر: Clinical Oral Implants Research. 24:671-678
مصطلحات موضوعية: Cone beam computed tomography, Dental radiography, medicine.medical_specialty, Radiodensity, medicine.medical_treatment, Ribs, In Vitro Techniques, Peri implant bone, Osteotomy, Postoperative Complications, medicine, Animals, Dental Implants, Rib cage, medicine.diagnostic_test, Receiver operating characteristic, business.industry, Periapical radiography, Dental Implantation, Endosseous, Radiography, Dental, Digital, Cone-Beam Computed Tomography, Cattle, Radiology, Oral Surgery, business
الوصف: Objective To compare the diagnostic accuracy of conventional periapical radiography and cone beam computed tomography (CBCT) at detecting peri-implant bone defects. Materials and methods Implants were placed in fresh bovine ribs in osteotomy sites of varying diameter (five with no peri-implant space, five with a 0.35 mm space, five with a 0.675 mm space) and imaged using (i) digital long cone periapical radiographs (LCPAs), (ii) limited volume CBCT using 3D Accuitomo 80® and (iii) large volume CBCT using i-CAT Next Generation®. Images from each were randomly presented to nine examiners on two occasions. Confidence in diagnosing the presence or absence of a peri-implant radiolucency was recorded on a five-point scale. Receiver Operating Characteristic (ROC) analysis and Kappa tests were performed. Results Digital LCPAs were better at diagnosing a peri-implant bone defect when the peri-implant space was 0.35 mm (P
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2
المؤلفون: Richard Palmer, Ron Wilson, Paul J. Palmer, Touraj Razavi, Jonathan Davies
المصدر: Clinical Oral Implants Research. 21:718-725
مصطلحات موضوعية: Cone beam computed tomography, medicine.anatomical_structure, Materials science, business.industry, medicine.medical_treatment, Reference values, medicine, Dentistry, Cortical bone, Oral Surgery, Dental implant, business, Biomedical engineering
الوصف: Objective:To assess the accuracy of measuring the cortical bone thickness adjacent to dental implants using two cone beam computed tomography (CBCT) systems.Material and methods:Ten 4 × 11 mm Astra Tech® implants were placed at varying distances from the cortical bone in two prepared bovine
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3
المؤلفون: Touraj, Razavi, Richard M, Palmer, Jonathan, Davies, Ron, Wilson, Paul J, Palmer
المصدر: Clinical oral implants research. 21(7)
مصطلحات موضوعية: Dental Implants, Bone Density, Reference Values, Alveolar Process, Animals, Cattle, Ribs, Cone-Beam Computed Tomography
الوصف: To assess the accuracy of measuring the cortical bone thickness adjacent to dental implants using two cone beam computed tomography (CBCT) systems.Ten 4 x 11 mm Astra Tech implants were placed at varying distances from the cortical bone in two prepared bovine ribs. Both ribs were scanned in a reproducible position using two different CBCT scanners. Ten examiners each carried out four measurements on all 10 implants using the two CBCT systems: vertical distance between the top of the implant and the alveolar crest (IT-AC), and thickness of the cortical bone from the outer surface of the implant threads at 3, 6 and 9 mm from the top of the implant. Ground sections were prepared and bone thickness was measured using a light microscope and a graticule to give a gold standard (GS) measurement.The examiner's measurements were significantly different between CBCT systems for the vertical and thickness dimensions (P0.001) while measuring the cortical bone thickness between 0.3 and 3.7 mm. Within that range, i-CAT NG measurements were consistently underestimated in comparison with the GS. Accuitomo 3D60 FPD measurements closely approximated the GS, except when cortical bone thickness was0.8 mm. The mean percentage errors from the GS at 3, 6 and 9 mm measurement levels were 68%, 28% and 18%, respectively, for i-CAT NG and 23%, 5% and 6%, respectively, for Accuitomo 3D60 FPD.Within the limitations of this study, it was concluded that i-CAT NG (voxel size 0.3) may not produce sufficient resolution of the thin cortical bone adjacent to dental implants and, therefore, the measurements may not be accurate; whereas, Accuitomo 3D60 FPD (voxel size 0.125) may produce better resolution and more accurate measurement of the thin bone.
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