LIZETT CASTELLANOS COSANOMASTER O.I.A Y PACIENTES
ESPECIALESINVESTIGACIN CLNICACASO n13DIFUSIN APICAL DEL HIDRXIDO DE
CALCIO EN UN ESTUDIO IN VITRONevertheless, endodontic treatment of
teeth with periapical lesions is less successful than treatment of
teeth with no lesion present (1). Because bacteria are the cause of
periapical disease (2), it is logical that failure to eradicate
these bacteria may cause persistence of the lesion. INTRODUCCIN
Consequently, the bacteria responsible for the failure of
endodontic therapy may be those colonizing the periapical tissues
and external surface of the root, where nonsurgical endodontic
therapy cannot affect them.Failure of the lesion to resolve may
therefore be due not to inadequate intraradicular endodontic
therapy, but rather to an inability to address the extraradicular
cause of the disease.
2CA(OH)2 IS ABLE TO MAINTAIN AN INCREASED TISSUE PH OVER A LONG
TIME BECAUSE OF THE SLOW RELEASE OF HYDROXYL IONS .Recently,
researchers have found that Enterococcus faecalis, the most
commonly isolated bacterial species in failed root canal
procedures, appears to have the ability to remain viable in
dentinal tubules, where Ca(OH)2 may not reach them despite extended
exposure time.Because Ca(OH)2 kills by the effect of hydroxyl ions,
its efficacy depends on the availability of those ions in solution,
which in turn depends on the vehicle in which the Ca(OH)2 is
carried. This relation has been demonstrated by the variable
effectiveness of Ca(OH)2-containing mixtures against this
bacterium. Analogously, the effectiveness of Ca(OH)2-containing
mixtures against microorganisms in the periapical tissues should
depend on the efficiency with which the intracanal medicament is
able to diffuse from the root canal.
HIDROXILOThe purpose of this study was to evaluate the apical
diffusion of three Ca(OH)2 medicaments: (1) a Ca(OH)2 and
methylcellulose preparation (PD); (2) a 10% aqueous suspension of
Ca(OH)2 in distilled water; and (3) a thick mixture of Ca(OH)2 in
distilled water with a viscosity similar to that of PD, through
four apical aperture sizes, Using simulated root canals in an in
vitro agar model.
OBJETIVOSMATERIAL Y MTODOSAgar solutions, 100 ml95 ml
filter-sterilized distilled water (dH2Oand 1.5 g Bacto Agar for a
1.5% final concentrationWere sterilized for 20 minutes at 120C,
then placed into a 50C water bath to prevent the agar from
congealing.
RESULTADOSNo color, pH, or Ca ion change from the reserved broth
specimen was noted for any negative control specimen.
