Effect of root resection on the apical sealing ability of mineral trioxide aggregate.
OBJECTIVE
The purpose of this in vitro study was to determine the minimum depth of mineral trioxide aggregate (MTA; ProRoot; DENTSPLY/Tulsa Dental, Tulsa, Okla) required to maintain an apical seal following root resection. Study design. In 10 instrumented teeth, MTA was used to obturate the apical 6 mm of the root canal and was allowed to set for 48 hours. Leakage was determined by means of a fluid filtration method at a pressure of 20 cm H(2)O. Leakage was measured before root resection, and after 3, 4, 5, and 6 mm apical resections. Data were analyzed by means of a Kruskal-Wallis one-way analysis of variance with P <.05.


RESULTS
Fluid leakage was shown to increase after each resection, but did not reach statistical significance (P <.05) until 4 mm of the apex had been removed.


CONCLUSIONS
The results indicate that root resection did not significantly affect the sealing ability of MTA when at least 3 mm of the MTA remained. Although there was a statistically significant difference in leakage following the 4 mm resection, it is unknown what the biological difference would be between the 3 mm and 4 mm resections.
Lamb
Edwin L
EL
Medical College of Georgia, Augusta, GA 30912-1244, USA. rloushin@mail.mcg.edu
Loushine
Robert J
RJ
Weller
R Norman
RN
Kimbrough
W Frank
WF
Pashley
David H
DH
D017607:Aluminum Compounds / Q000737:chemistry*; D000704:Analysis of Variance; D001047:Apicoectomy / Q000145:classification; D017610:Calcium Compounds / Q000737:chemistry*; D003481:Cuspid / Q000601:surgery; D001840:Dental Bonding; D003763:Dental Leakage / Q000145:classification; D004338:Drug Combinations; D005374:Filtration / Q000295:instrumentation; D006801:Humans; D010087:Oxides / Q000737:chemistry*; D011312:Pressure; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation; D018915:Root Canal Preparation; D017640:Silicates / Q000737:chemistry*; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013997:Time Factors
D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate