N=4 dogs with healthy periodontium.
-maxillary and mandibular premolar/molars; 64 perforations made.
-Performed under general anesthesia, rubber dam placed and accesses made, Cleaned and shaped with sterile saline and obturated with Cavit.
-#4 round bur used to perforate the furcation which was then rinsed with sterile saline. Heme controlled with racellets.
-4 equal groups of perforation repair materials used: amalgam, cavit, CaOH, and nothing (cotton pellet).
-occlusal amalgams placed and 3 month observation occurred clinically and xray; sacrificed dogs and histo
-possible role of bacterial contamination not investigated.
-tissue responds best in the following order: amalgam>cavit>CaOH>nothing.
-most bone resorption and clinical exposure of furcal areas occurs within first 1-2 months and then slows.
-cavit and amalgam had a similar inflammatory response, much less than CaOH.
Attempting to repair a perforation better than no repair. The use of CAOH for 1 month or more results in more periodontal destruction. Amalgam is better than Cavit for repairs.