H. Caulier et al., THE RELATIONSHIP OF SOME HISTOLOGIC PARAMETERS, RADIOGRAPHIC EVALUATIONS, AND PERIOTEST MEASUREMENTS OF ORAL IMPLANTS - AN EXPERIMENTAL ANIMAL STUDY, The International journal of oral and maxillofacial implants, 12(3), 1997, pp. 380-386
The objective of this study was to analyze the efficacy and correlatio
n between clinical and histologic parameters used to evaluate oral imp
lants. after extraction of the premolars and a healing time of 4 month
s in 16 Dutch goats, four Branemark implants were placed in the maxill
ary left and light premolar regions, After a healing time of 6 months,
followed by another 4 months with the permucosal abutments, the goats
mere sacrificed and the jaws were block-resected. Before histologic p
reparation, long-cone radiographs were made and Periotest scores of th
e implants were recorded. Bone level measured histomorphometrically we
re found to be 0.85 mm more apically, compared to that measured radiol
ogically (P = .001). Furthermore, statistically significant correlatio
ns (P > 0.2) were not found between the Periotest values of the calciu
m-phosphate-coated and uncoated implants for (1) the first thread in c
ontact with bone, or (2) with the total number of threads in contact w
ith bane. It was concluded that the radiologic data overscored the rea
l marginal I,one level around screw-shaped oral implants, and that the
Periotest device is neither able to discriminate between the first th
read nor between the total number of threads in contact with bone.