F-mod and modSLA surfaces showed no significant differences in early bone responses. Furthermore, the implant design had no influence on the bone response. This in vivo experimental model will help improve the evaluation of surface modification factors by allowing an independent estimation of one variable (surface modification) against a constant (implant design).

In a recent publication, "First-order mathematical correlation between damping and resonance frequency evaluating the bone-implant interface," Kwon et al. [1] found a statistical linear correlation between the Periotest and implant stability quotient values. The Periotest device (Gulden Messtechnik, Bensheim, Germany) evaluates the quality of the bone-implant interface using the damping effect at the interface. When the implant firmly contacts the bone, the damping effect becomes smaller, which reduces the Periotest value (PTV) (the overall PTV range is from −8 to 50) [2,3]. Resonance frequency analysis can detect the frequency of the peak output amplitude responsive to input signals, which varies depending on the quality of the interface between the implant and the bone [3,4].This frequency is used to derive the implant stability quotient (ISQ) value, which is higher (within an overall range from 0 to 100) for more stable bone-implant interfaces. Although the authors formulated a linear equation showing a statistical correlation between the PTV and the ISQ value [1], this finding is in conflict with many studies that have found little or no significant correlation even though the two values would intuitively seem to be associated [5].