Testing of Mean Filler Content and Wear Properties of Printed and Machined Tooth Materials

The Boston University Goldman School of Dental Medicine wear test is a pin on plate design similar to the UAB system. Plates of Vita MKII (shown to wear at a similar rate as tooth enamel by both in-vivo and in-vitro tests) are on the bottom of the device and  pins of test material are on the top and weighted. A continuous flow of water is used to remove wear debris. The pin material has dimensions of about 3.5 mm in diameter and 5 - 6 mm high. The pins are bonded to metal rods that are weighted with a 400 gm load. The pins are moved in a slight arc motion across the plates for 200,000 cycles. The pin/rod apparatus is weighed and pin height measured with a dial micrometer.