Retention of threaded pins in amalgam.

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Restorative Dentistry

Background:

• Self-threading retention pins are crucial for stabilizing dental restorations.
• Understanding pin-amalgam interaction is vital for long-term restoration success.
• Various pin designs and amalgam compositions exist, necessitating comparative analysis.

Purpose of the Study:

• To determine the removal force for three types of self-threading retention pins (Minuta, Minikin, Minim) from amalgam.
• To identify the optimal pin length for maximum retention in different amalgam types.
• To provide clinical guidance on pin selection based on retention and amalgam properties.

Main Methods:

• Tested TMS Minuta, Minikin, and Minim self-threading retention pins.
• Evaluated pins in high-copper admixture and ternary spherical-type amalgam alloys.
• Measured the force required for pin removal.
• Investigated the effect of Minim pin length (2-2.5 mm) on retention.

Main Results:

• The TMS Minim pin, 2 to 2.5 mm in length, demonstrated optimal retention in high-copper amalgam.
• Minuta and Minikin pins required significantly less force for removal.
• Pin retention varied based on pin design and amalgam composition.

Conclusions:

• The 2 to 2.5 mm TMS Minim pin is recommended for optimal retention in high-copper amalgam.
• Minuta and Minikin pins are suitable for situations requiring minimal pin size, but necessitate the use of stronger amalgam materials.
• Clinical selection should balance retention needs with pin size and amalgam properties.