Now is the time to change to custom impression trays.
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[1] G. Christensen. Complex fixed and implant prosthodontics: making nearly foolproof impressions. , 1992, Journal of the American Dental Association.
[2] G J Christensen,et al. Day-to-day fixed prosthodontics: a fast, easy, predictable approach. , 1992, Journal of the American Dental Association.