Adhesives & Retention Systems Flashcards

In adhesive science applied to facial prosthetics, 'peel strength' specifically measures resistance to forces applied in which direction?

Answer: At an angle peeling the bond progressively from one edge

Peel strength measures the force required to progressively separate a flexible adhesive bond starting from one edge at an angle, which is the mode most relevant to a prosthesis edge lifting from skin.

In a combination retention system for a midfacial prosthesis, which elements are most commonly integrated?

Answer: Osseointegrated implant bar-clip framework supplemented with adhesive at the prosthesis margins

Combining an implant-retained bar-clip framework for primary stability with marginal adhesive for edge seal optimizes both retention strength and cosmetic blending in complex midfacial defects.

Which adhesive formulation performs BEST for patients in humid climates or those who perspire heavily during daily activities?

Answer: Moisture-resistant silicone-based adhesive

Moisture-resistant silicone-based adhesives maintain bond integrity in the presence of perspiration and humidity, making them the appropriate choice for patients whose skin conditions challenge standard adhesive performance.

When using a magnetic retention system for an auricular prosthesis on osseointegrated implants, the magnets are embedded in which components?

Answer: Both the implant abutment housings and the fitting surface of the prosthesis

Magnetic retention requires complementary magnets embedded in both the implant abutment housing on the patient side and the prosthesis fitting surface, creating attraction when the prosthesis is properly seated.

Which factor is the PRIMARY consideration when selecting between adhesive retention and implant-retained bar-clip retention for an auricular prosthesis?

Answer: Adequacy of remaining tissue for adhesive retention, patient dexterity, activity level, and preference

Retention system selection is driven by a comprehensive clinical assessment including available tissue, patient manual dexterity for self-management, physical activity demands, and the patient's informed preference.

The term 'cohesive failure' in prosthetic adhesive bonding refers to:

Answer: Failure occurring within the adhesive layer itself rather than at either bonded interface

Cohesive failure occurs when the adhesive material itself ruptures internally, leaving residue on both the prosthesis and the skin, indicating the bond at both interfaces exceeded the adhesive's internal strength.

When instructing a patient on the MOST critical daily practice to prevent cumulative skin complications with adhesive-retained prostheses, the anaplastologist should emphasize:

Answer: Completely remove all adhesive residue each day and inspect the skin for early signs of breakdown before reapplication

Complete daily adhesive removal followed by careful skin inspection allows early detection of irritation, prevents cumulative chemical exposure, and maintains the skin integrity necessary for long-term prosthetic use.