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Changes in dentin after insertion of self-threading titanium pins with 3 methods: a scanning electron microscope
Sanja Segović1, Suzana Ferk, Ivica Anić
1Department of Endodontology and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Croatia.
The Journal of Prosthetic Dentistry
|February 21, 2002
Summary
Self-threading pins can cause dentinal cracks, but dentin bonding agents do not fully penetrate these cracks. The bonding agent seals crack openings and spaces between the pin and dentin.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials
Background:
- Self-threading pins are used in dental restorations.
- Pin insertion can lead to dentinal cracks.
- Penetration of dentin bonding agents into these cracks is not well understood.
Purpose of the Study:
- To document dentinal cracks after self-threading pin placement using different methods.
- To observe dentin changes when a bonding agent is applied before pin insertion.
Main Methods:
- Scanning electron microscopy (SEM) was used to examine dentinal cracks.
- Three pin insertion methods were tested: manual, handpiece at 7000 rpm, and handpiece at 30,000 rpm.
- X-ray mapping analyzed dentin bonding agent presence and composition.
Main Results:
- Dentinal cracks were observed in 50-54.5% of specimens depending on pin insertion method.
- The dentin bonding agent was present between the pin and dentin wall.
- The bonding agent did not fill the dentinal cracks, only their orifices.
Conclusions:
- Pin insertion method did not significantly influence dentinal crack formation.
- Dentin bonding agents can seal pin tract preparation walls and crack orifices.
- Further research is needed to fully understand bonding agent behavior in dentinal cracks.