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Retention and resistance provided by nine self-threading pins
1Department of Restorative Dentistry, University of Texas Health Science Center at San Antonio 78284-7890.
Operative Dentistry
|March 1, 1991
Summary
Minim and PPS pins offer superior dentin retention for dental restorations. Titanium alloy and stainless steel pins provide better resistance in amalgam fillings compared to pure titanium or heat-softened steel.
Area of Science:
- Dental materials science
- Biomaterials engineering
- Restorative dentistry
Background:
- Dental pins are used to enhance the retention of complex amalgam restorations.
- Understanding pin retention in dentin and their contribution to restoration resistance is crucial for clinical success.
Purpose of the Study:
- To evaluate the retention characteristics of nine different pin types in dentin.
- To assess the resistance provided by these pins to complex amalgam restorations under simulated clinical conditions.
Main Methods:
- Extracted molar teeth were prepared and pins were embedded in dentin.
- Pin retention was tested using an Instron Testing Machine under tensile load.
- Amalgam restorations incorporating each pin type were subjected to compressive loading at a 45-degree angle.
Main Results:
- Minim and PPS pins demonstrated significantly higher retention in dentin compared to other tested pins.
- Titanium alloy and stainless steel pins offered significantly greater resistance to amalgam restorations than pure titanium or heat-softened stainless steel pins.
Conclusions:
- Minim and PPS pins are recommended for improved retention in dentin.
- The material composition of pins significantly impacts the mechanical resistance of complex amalgam restorations.