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A new type of filler particle has been developed as the inorganic component in a posterior composite resin. Identified as zirconialsilica, this agent consists of small centers of amorphous silica surrounded by satellites of zirconium dioxide. Marketed as P‐50, this new posterior composite resin was clinically evaluated for wear resistance and other pertinent characteristics. At the end of one year the wear rate averaged less than one micrometer per month.
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Mazer et al. (1988) studied this question.
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