Related Experiment Video
Updated: Aug 16, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
[Effect of cone angle on fracture resistance force of root and post-core system]
Yan-nan Ma1, Xin-min Chen, Li-ya Xu
1Department of Prosthodontics, West China Stomatological Hospital, Sichuan University, Chengdu 610041, China.
Objective:
To study the effect of cone angle on fracture resistance force of root and post-core system.
Methods:
Forty-two simulated tooth roots made of polymethacrylate (PMMA) were divided into six groups according to the root canal cone angles of 0 degrees, 3.93 degrees, 5.71 degrees, 7.48 degrees, 11.31 degrees and 14.71 degrees. Cast post and cores were manufactured and cemented with zinc polycarboxylate cement (PC). Casting the post and core to restore every simulated tooth root. Each specimen was embedded in acrylic resin and then fixed in a special jig on the universal load-testing machine. A compressive load was applied at a 90-degree angle to the long axis of the core until fracture, at a crosshead speed of 1 mm/min. The maximum of load was recorded.
Results:
The mean values of load in root and post-core system were 0.1225 kN, 0.1498 kN, 0.1600 kN, 0.1893 kN, 0.1078 kN and 0.0945 kN. There were significant differences in the fracture resistance among groups.
Conclusion:
The fracture resistance force of cast post and core increased with the enlargement of post cone angles under certain conditions.
Related Concept Videos
Behavior of Concrete Under Compressive Load
As the concrete specimen fractures under...
Normal Strain under Axial Loading
Unsymmetric Bending - Angle of Neutral Axis
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal centroidal axes. The...
General Case of Eccentric Axial Loading
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical bending,...
Residual Stresses in Circular Shafts
Flexural Stress
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
