Rubinoff CH, Greener EH, Robinson PJ. Physical properties of periodontal dressing materials, J Oral Rehab, 13:757,1986.

The purpose of this study was to develop standardized reproducible methods for evaluating the physical properties of working and setting times, adhesion and dimensional stability for periodontal dressing material.

Materials and Methods

• Coe-Pak , Coe-Pak-Hard and Fast Set, and Ward's Wond-Pak
• 5 specimens for each material
• Working and setting properties were determined by observing the changes in viscosity via a rheometer.
• 24h and 1 week tensile strength were assessed .
• Dimensional changes were assessed

Results

• After 24h neither Coe Pak and Coe Pak Hard and Fast set had reached final set. Benche time was from the start of the mix until the material reached the putty-like consistency such that it could be handled without sticking to one's finger.
• The handling time was the considered to be the period from the end of the bench time to the end of the working time.
• Wonder Pak had significantly longer working time.
• No differences between Coe Pak, Coe Pak Hard and Fast set. The bench time for Coe Pak ( 3.6 min) is greater than that for Coe Pak Hard and Fast Set. Wondpak had no bench time.. WondPak set to a brittle cement-like state.
• The analysis of adhesion at 1 and 7 days did not show any difference in the tensile strength. WondPak was the less adhesive after 24h.
• Coe Pak had initial expansion
• Coe Pak Hard and FastSet showed gradual small expansion and then contraction
• WondPak had significant linear contraction.

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