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Vertical root fracture and relative deformation during obturation and post cementation
G Obermayr1, R E Walton, J M Leary
1Department of Endodontics, University of Iowa, College of Dentistry, Iowa City.
The Journal of Prosthetic Dentistry
|August 1, 1991
Summary
Post placement and cementation cause more root strain than lateral condensation alone. However, combined procedures did not significantly increase vertical root fracture incidence in this study.
Area of Science:
- Endodontics
- Dental Materials Science
- Biomechanical Engineering
Background:
- Vertical root fractures (VRFs) are a significant cause of tooth loss.
- Speculated etiologies include forces during post placement and lateral condensation during root canal obturation.
- A comparative analysis using a unified measurement system is lacking.
Purpose of the Study:
- To quantify and compare root strain during obturation and post cementation.
- To determine the incidence of VRFs during these procedures.
- To identify the primary source of root stress.
Main Methods:
- 32 extracted maxillary central incisors underwent step-back preparation.
- Teeth were divided into control and experimental groups.
- Root strain was measured using a strain gauge during lateral condensation and post cementation; fractures were assessed via transillumination and stereomicroscopy.
Main Results:
- Post placement and cementation generated significantly greater relative root deformation compared to obturation alone.
- The combined strain from both procedures did not significantly elevate VRF incidence.
- Root stresses during post cementation were identified as the primary cause of relative deformation.
Conclusions:
- Post cementation is a more significant contributor to root deformation than root canal obturation.
- While post placement induces substantial stress, it did not proportionally increase fracture rates in this experimental setup.
- Further research may explore long-term effects and different post materials.