title: Ultrasonic root-end preparation, Part 2. Microleakage of EBA root-end fillings.
abstract: The effect of three methods of root-end preparation, following apical resection, on the apical seal of root-end fillings, was studied in vitro. Root canals of 116 single-rooted teeth with mature apices were prepared chemomechanically and obturated with gutta-percha and sealer. The root ends were resected with a diamond bur under water coolant and were prepared as follows: group I a size 010 round bur was used to prepare an apical cavity 2-3 mm down the long axis of the root; group II treatment as per group 1 followed by a 60-s rinse with a solution of 10:3 (10% citric acid: 3% Fe2Cl3); and group III an ultrasonic retrotip was used to prepare a 2-3 mm deep apical cavity. The root end was restored with an EBA cement. Apical leakage was determined using India ink after 7 days and 7 months. The teeth were demineralized, rendered transparent and linear dye penetration was recorded. Results showed that there was no significant difference in leakage between the groups at each time interval (P > 0.05) but there was increased leakage after 7 months (P < 0.01). Cracking of the root surface was seen most often with the ultrasonically prepared roots (P < 0.001).
authors.affiliation: Department of Adult Dental Care, Glasgow Dental Hospital and School, United Kingdom.
authors.forename: W P
authors.initials: WP
authors.lastname: Saunders
authors.forename: E M
authors.initials: EM
authors.lastname: Saunders
authors.forename: J L
authors.initials: JL
authors.lastname: Gutmann
mesh_terms: D016009:Chi-Square Distribution; D002951:Citrates; D019343:Citric Acid; D003763:Dental Leakage; D017220:Dentin-Bonding Agents; D006801:Humans; D012184:Retrograde Obturation / Q000295:instrumentation* / Q000379:methods; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D018709:Statistics, Nonparametric; D013997:Time Factors; D014464:Ultrasonic Therapy / Q000295:instrumentation*
chemical_list: D002951:Citrates; D017220:Dentin-Bonding Agents; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D019343:Citric Acid; C084074:Super EBA