The aim of the current article was to present a radiographic method to determine the
surface area of newly formed periodontal attachment, as well as to analyze volumetric
and morphologic changes after regenerative periodontal treatment.In this retrospective
study, 11 singular intrabony periodontal defects were selected for minimally invasive
surgical treatment and 3D evaluation. 3D virtual models were acquired by the segmentation
of pre- and postoperative CBCT scans. This study determined the surface area of baseline
periodontal attachment (RSA-A) and defect-involved root surface (RSA-D) on the preoperative
3D models, and the surface area of new periodontal attachment (RSA-NA) on the postoperative
models. Finally, cumulative change of periodontal attachment (∆RSA-A) was calculated
and Boolean subtraction was applied on pre- and postoperative 3D models to demonstrate
postoperative 3D hard tissue alterations.The average RSA-A was 84.39 ± 33.27 mm2,
while the average RSA-D was 24.26 ± 11.94 mm2. The average surface area of RSA-NA
after regenerative periodontal surgery was 17.68 ± 10.56 mm2. Additionally, ∆RSA-A
was determined to assess the overall effects of ridge alterations on periodontal attachment,
averaging 15.53 ± 12.47 mm2, which was found to be statistically significant (P =
.00149). Lastly, the volumetric hard tissue gain was found to be 33.56 ± 19.35 mm3,
whereas hard tissue resorption of 26.31 ± 38.39 mm3 occurred.The proposed 3D radiographic
method provides a detailed understanding of new periodontal attachment formation and
hard tissue alterations following regenerative surgical treatment of intrabony periodontal
defects.
