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Enamel-dentin crown fractures bonded with various bonding agents
E C Munksgaard1, L Højtved, E H Jørgensen
1Department of Dental Materials and Technology, University Hospital (Rigshospitalet), Copenhagen, Denmark.
Endodontics & Dental Traumatology
|April 1, 1991
Summary
Researchers measured the fracture strength of repaired sheep incisors. Bonding with specific dental agents and acid etching restored about 50% of intact tooth strength, crucial for dental repair research.
Area of Science:
- Biomaterials Science
- Dental Research
- Mechanical Testing
Background:
- Fractured incisors pose a significant clinical challenge.
- Assessing the mechanical integrity of repaired teeth is crucial for treatment success.
- Previous studies have not fully elucidated the fracture strength of bonded, previously fractured incisors using various agents.
Purpose of the Study:
- To describe a method for measuring the fracture strength of bonded, previously fractured incisors.
- To compare the efficacy of different bonding agents in restoring tooth fracture strength.
Main Methods:
- Sheep incisors were fractured parallel to the incisal edge.
- Fractured surfaces were acid-etched, and some dentin surfaces were treated with Gluma, Tenure, or Scotchbond2.
- Teeth were bonded with an unfilled resin, and fracture strength was measured.
Main Results:
- The mean fracture area of central incisors was 8.45 +/- 0.89 mm2 and lateral incisors was 6.50 +/- 0.64 mm2.
- Enamel constituted approximately 30% of the total fracture area.
- Bonding with acid etching and an unfilled resin yielded ~38% of the strength of repairs using Gluma treatment; different bonding agents (Tenure, Scotchbond2) showed no significant difference from Gluma.
- Repaired teeth achieved approximately 50% of the fracture strength of intact teeth (around 8 MPa).
Conclusions:
- The described method allows for the measurement of fracture strength in repaired incisors.
- Acid etching combined with specific dentin bonding agents and unfilled resin can restore significant fracture strength to previously fractured incisors.
- The restored fracture strength is approximately 50% of intact teeth, providing valuable data for dental repair protocols.