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Updated: Aug 6, 2026
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Mechanical properties of an implant titanium base abutment with a new biologically inspired design
Davide Silvestri1, Carlo Monaco2, Lorenzo Breschi3
1PhD student, Department of Biomedical and Neuromotor Sciences, Alma Mater Studiorum, University of Bologna, 40125, Bologna, Italy.
Objectives:
Abutment design in the esthetic zone must support peri‑implant soft tissues while maintaining sufficient mechanical strength. This in vitro study evaluated the fracture resistance of two commercial titanium-base (Ti-base) abutments and two customized Ti‑bases featuring biologically inspired, soft‑tissue-oriented geometries.
Methods:
Four groups were tested: A: commercial Ti‑base (transmucosal height 2.0 mm; bonding-base height 4.0 mm); B: commercial Ti‑base with increased bonding-base height (8.0 mm); C: customized Ti‑base with an anatomically contoured margin (mesial and distal areas 1.5 mm, and palatal area 1.0 mm more coronal than the vestibular margin; transmucosal height 2.5 mm; bonding‑base height 4.0 mm); D: customized Ti‑base with contoured margin and channel for angled screw (transmucosal height 2.5 mm; bonding‑base height 4.0 mm). Abutments were tightened onto implant analogs and subjected to static load-to-fracture testing using a universal testing machine (Instron). One‑way ANOVA and Tukey post‑hoc tests were applied (α = .05).
Results:
Statistically significant differences were detected among groups (p < 0.0001), however no statistically significant difference was found between group B and D (p = 0.0685). Mean fracture resistance values (N ± SD) were: Group A, 873.2 ± 18.2; Group B, 570.2 ± 34.3; Group C, 1068.5 ± 75.5; Group D, 631.6 ± 66.0. Yield point values were: Group A, 755 ± 17.6; Group B, 468.8 ± 31.8; Group C, 885.2 ± 28.1; Group D, 608.4 ± 85.9.
Conclusions:
Within the limitations of this in vitro mechanical evaluation, the anatomically contoured customized Ti‑base demonstrated the highest fracture resistance.
Clinical Significance:
The use of a Ti-base with anatomically scalloped shoulders (1.5 mm interproximal elevation, 1.0 mm palatal elevation) demonstrated superior mechanical properties (1068.5 N fracture load) compared to conventional designs (873.2 N), suggesting potential clinical advantages for managing esthetic cases with scalloped-thin gingival phenotypes, while maintaining fracture resistance above physiological loads (90-390 N). However, clinical validation and fatigue testing are required before widespread adoption.
