Fig 1.
(A) Site treated with alveolar ridge preservation (ARP) using a xenogeneic bone graft and collagen membrane. (B) The contralateral site was left to heal spontaneously without grafting.
Fig 2.
Cross-sectional view of the region of interest.
Superimposed intraoral scan-derived STL models obtained at three time points: immediately before tooth extraction (yellow), 30 days post-extraction (blue), and 90 days post-extraction (white). Models were registered based on adjacent teeth. A reference line was drawn through the buccal and lingual gingival margins. Horizontal dimensional changes (HW; red arrows) were measured at 2 mm (H2) and 4 mm (H4) apical to the reference line. Vertical dimensional changes (orange arrow) were quantified perpendicular to the reference line at the center of the ridge.
Fig 3.
Linear changes in ridge contour over time.
(A) Time-dependent horizontal changes at buccal and lingual aspects measured at H2 and H4. (B) Comparison of linear changes across positions at 30 and 90 days post-extraction. H2: horizontal width 2 mm apical to the reference line; H4: horizontal width 4 mm apical to the reference line; ARP: alveolar ridge preservation.
Fig 4.
Vertical linear changes in ridge contour.
Vertical dimensional changes were measured at the center of the extraction socket at baseline, 30 days, and 90 days post-extraction. ARP: alveolar ridge preservation.
Fig 5.
Mean distance between surfaces (RMS).
Mean distance (root mean square, RMS) between superimposed surface models over time, quantifying volumetric soft tissue changes. ARP: alveolar ridge preservation.
Fig 6.
Volumetric changes in the extraction site.
Three-dimensional volumetric changes were calculated by extracting regions of interest (ROIs) defined by consistent buccal and lingual borders and measuring the enclosed polygonal volume. ARP: alveolar ridge preservation.
Table 1.
Changes in ridge contour between baseline and 30, 90 days post-extraction based on intraoral scanned data measurements (mean ± SD).