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Figure 1. Schematic representations of the various degrees of hard-tissue loss that the tested premolars might exhibit at completion of endodontic treatment. The darker area represents the missing structure in the conditions referred to as (A) 4 coronal walls retained (Group 1, N = 40), (B) 3 walls remaining (Group 2, N = 40), (C) 2 walls maintained (Group 3, N = 40), and (D) only 1 coronal wall preserved (Group 4, N = 40).
J DENT RES, Vol. 86, No. 8,
729-734 (2007)
DOI: 10.1177/154405910708600808
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