Clasp retention and composites: an abrasion study.

Area of Science:

• Materials Science
• Biomaterials Engineering
• Dental Prosthodontics

Background:

• Composite resins are widely used in dentistry, including for creating undercuts for removable partial denture clasps.
• Assessing the wear characteristics of these materials against prosthetic components is crucial for long-term clinical success.
• Understanding the interaction between composite resins and denture clasp materials can prevent premature failure and patient dissatisfaction.

Purpose of the Study:

• To evaluate the abrasion resistance and abrasivity of nine composite resins.
• To determine the wear of wrought stainless steel clasps when in contact with these composite resins.
• To assess the clinical relevance of observed abrasion for removable partial denture retention.

Main Methods:

• An in vitro test was developed to screen abrasion resistance and abrasivity.
• Nine different composite resins were tested.
• Wrought stainless steel round clasps were used as the opposing abrasive material.

Main Results:

• The abrasion of the tested composite resins was unlikely to cause significant loss of retention in a clinical setting.
• Two specific composite resins demonstrated marked abrasion of the stainless steel clasps.
• This significant clasp abrasion by certain composites is considered clinically relevant.

Conclusions:

• While most composite resins exhibit adequate wear resistance against denture clasps, careful material selection is necessary.
• Certain composite resins can cause significant wear to stainless steel clasps, potentially compromising denture retention and function.
• Further research into the long-term effects of these interactions is warranted for optimizing removable partial denture design.