title: Effect of matrix placement on furcation perforation repair.
abstract: Furcation perforations are a serious complication during endodontic treatment, and a matrix to aid placement of repair material has been recommended. This study tested the sealing ability of amalgam and Ketac silver placed with and without plaster of Paris as a matrix. A bacterial penetration technique was used to test the seal. Perforations created in the pulpal floor of extracted human mandibular molars were repaired as follows: group 1, amalgam; group 2, amalgam plus plaster as a matrix; group 3, Ketac silver; and group 4, Ketac silver plus plaster (17 teeth/group). Leakage was measured by placing bacteria (Streptococcus sobrinus) in the pulp chamber, and recording the time taken for bacterial growth in a medium bathing the root surface. A plaster of Paris matrix improved the seal with amalgam, but not with Ketac silver. Ketac silver provided the best seal, but all materials showed complete leakage within 22 days.
mesh_terms: D002133:Calcium Sulfate; D016722:Cermet Cements; D003723:Dental Amalgam; D003763:Dental Leakage; D005069:Evaluation Studies as Topic; D006801:Humans; D018915:Root Canal Preparation / Q000009:adverse effects* / Q000295:instrumentation; D012390:Root Canal Therapy / Q000009:adverse effects / Q000379:methods; D018709:Statistics, Nonparametric; D016986:Streptococcus sobrinus; D018677:Tooth Injuries / Q000209:etiology / Q000628:therapy*; D014092:Tooth Root / Q000293:injuries*