• Napassorn Kangvansurakit, D.D.S.
• Patita Bhuridej, D.D.S., Ph.D.
• Atiphan Pimkhaokham, D.D.S., Ph.D.
• Onanong Chai-U-Dom Silkosessak, D.D.S., M.Sc.

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.

(CU Dent J. 2017;40:39-50)