PCZOPolk County Zoning Ordinance (Polk County Planning Commission; Oregon)
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Groups PCrZO, PCrCH, PCZO, PCCH and OTg had their gutta-percha removed at a length equal to 2/3 of the total length of the root using a largo reamer #2 (Dentsply Maillefer, Ballaigues, Switzerland).
Groups PCrZO and PCZO had their interim post and core crowns coated with Rely X Temp NE; groups PCrCH and PCCH were coated with Hydro C.
Groups PCrZO and PCZO showed statistical differences between them (P < 0.