title: In Vitro Effects of External Pressure Changes on the Sealing Ability under Simulated Diving Conditions.
abstract: Aim. To measure and validate the permeability of pressure changes in correlation to different root filling techniques. Methods. Eighty extracted single-rooted teeth were randomly assigned to one of eight groups of ten teeth. Following standardized instrumentation and irrigation, root canal fillings were performed using either cold lateral condensation, a warm carrier-based gutta-percha obturation technique, a warm carrier-based Resilon, or warm gutta-percha compaction with the downpack/backfill technique. After insertion of a pressure sensor within the pulp chamber ten teeth of each group then underwent simulated dives with pressure measurement and the other ten a dye penetration test during simulated dives to 5.0 bar. Differences were analyzed statistically (P < 0.05) using one-way analysis of variance (ANOVA). Results. When the warm carrier-based gutta-percha obturation technique and vertical gutta-percha obturation techniques were used, there was significant lower intrapulpal pressure to experimental chamber pressure (P > 0.05). When cold lateral condensation or carrier-based Resilon as used, pressure was sometimes almost completely equalized. Conclusions. Warm gutta-percha obturation techniques provide a largely pressure-tight seal whereas the Resilon obturation technique and cold lateral condensation appear to be unsuitable to pressure changes.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Hanover Medical School, 30625 Hannover, Germany.
authors.forename: Marcus
authors.initials: M
authors.lastname: Stoetzer
authors.forename: Martin
authors.initials: M
authors.lastname: Ruecker
authors.forename: Andreas
authors.initials: A
authors.lastname: Koch
authors.forename: Dirk
authors.initials: D
authors.lastname: Ziebolz
authors.forename: Horst
authors.initials: H
authors.lastname: Kokemüller
authors.forename: Christina
authors.initials: C
authors.lastname: Kaempf
authors.forename: Nils-Claudius
authors.initials: NC
authors.lastname: Gellrich
authors.forename: Constantin
authors.initials: C
authors.lastname: von See