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Crown margin design: a dental school survey.
Butel EM, Campbell JC, DiFiore PM. Butel EM, et al. J Prosthet Dent. 1991 Feb;65(2):303-5. doi: 10.1016/0022-3913(91)90179-z. J Prosthet Dent. 1991. PMID: 2051369
A slide duplicator attachment.
Butel EM. Butel EM. J Prosthet Dent. 1990 May;63(5):600-1. doi: 10.1016/0022-3913(90)90084-p. J Prosthet Dent. 1990. PMID: 1692591 No abstract available.