Effects of cement type and thickness on retention of serrated pins.

The retentive capacity of cemented pins was determined. Zinc phosphate, polycarboxylate, and cyanoacrylate were used to cement threaded pins (0.024 inch) into precise channels of 0.025, 0.026, and 0.027 inch. Highest retentive values were realized when zinc phosphate and polycarboxylate cements were used with the smallest pin-channel mismatch. Ethyl cyanoacrylate was least retentive and demonstrated no mismatch dependency.