Influence of calcium hydroxide association on the physical properties of AH Plus.
BACKGROUND
This study evaluated in vitro the radiopacity, setting time, flow, film thickness, solubility, and dimensional changes of AH Plus sealer pure (Dentsply De Trey Gmbh, Konstanz, Germany) and containing 5% and 10% of calcium hydroxide.


METHODS
The study was performed according to the requirements of the ISO 6876:2001 standard and the American National Standards Institute/American Dental Association (ANSI/ADA)'s Specification No. 57. The following tests were performed: setting time, flow, film thickness, dimensional stability, radiopacity, and solubility. Data were analyzed statistically by analysis of variance and the Tukey tests with a significance level of 5%.


RESULTS
The addition of 5% or 10% calcium hydroxide to AH Plus sealer did not alter significantly the radiopacity or setting time values (p > 0.05). Adding 10% calcium hydroxide reduced the flow compared with pure AH Plus and AH Plus/5% calcium hydroxide. The addition of 5% and 10% calcium hydroxide increased the solubility and expansion of AH Plus. All materials presented expansion valued above those recommended by the ADA. The addition of calcium hydroxide to the sealer resulted in greater film thickness.


CONCLUSIONS
The addition of 5% calcium hydroxide did not affect most physical properties of AH Plus sealer.
Duarte
Marco Antonio Hungaro
MA
Department of Operative Dentistry, Dental Materials and Endodontics, Dental School of Bauru, University of São Paulo, Bauru, SP, Brazil. mhungaro@travelnet.com.br
Ordinola-Zapata
Ronald
R
Bernardes
Ricardo Affonso
RA
Bramante
Clovis Monteiro
CM
Bernardineli
Norberti
N
Garcia
Roberto Brandão
RB
de Moraes
Ivaldo Gomes
IG
D002126:Calcium Hydroxide / Q000737:chemistry*; D055598:Chemical Phenomena; D003287:Contrast Media / Q000737:chemistry; D004853:Epoxy Resins / Q000737:chemistry*; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D044367:Phase Transition; D012212:Rheology; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012995:Solubility; D013499:Surface Properties; D013997:Time Factors; D014783:Viscosity
D003287:Contrast Media; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; D002126:Calcium Hydroxide