Chulalongkorn University Dental Journal

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Background/objectives Resonance frequency analysis (RFA) is a non-invasive method for implant stability evaluation by implant stability quotient (ISQ) value. However, RFA cannot provide pre-implant placement prediction. Therefore, a new method for pre-surgical outcome projection is still needed. Fractal dimension (FD) is a radiographic quantitative analysis for bone complexity, which might be use as a stability predictor at the time of treatment planning. This investigation aimed to study the correlation between FD and ISQ Materials and methods Patients, receiving implant placement at Faculty of Dentistry, Chulalongkorn University between 2013-2017, were screened according to study criteria. Inclusion conditions included presence of ISQ and absence of systemic condition affecting bone quality. Demographic data of the patient and details of implant treatment were collected. CBCT data acquired within 6 months prior to ISQ measurement were reconstructed into cross-sectional slices for FD calculation, while imaging related variables were documented. Significant affecting factors to ISQ were inspected using multiple linear regression beforehand. Subsequently, a correlation between ISQ and FD with confounding factors was re-analyzed. Results ISQ values at implantation time were significantly affected by implant diameter and placement jaw bones. (R2 = 0.307, p < 0.001) No significant correlation was found between ISQ and FD when including age, sex, implant diameter, implanted jaw bone, image resolution and x-ray machine. Conclusions No linear correlation between FD from pre-implant CBCT image under this studyûs condition and ISQ at the time of implant placement was found. Implant diameter and jaw type for implantation were found to influence ISQ value.



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