Does cold burnishing gutta-percha create a better apical seal?

By Minnich SG, Hartwell GR, Portell FR.

Date: 03/1991
Journal: JOE

Summary: 

Purpose: to evaluate and compare the seal created by cold burnishing gutta-percha after resection and with no further manipulation of the gutta-percha after resection

N= 60 single rooted teeth (4  groups of 15)

Materials/Methods:

•Teeth were cleaned and shaped to a minimal apical size of 45

•The apical 2 mm of the root were sectioned at right angle

•Group I: well obturated (spreader placed 1 mm short of WL), no further manipulation of GP

•Group II: as group I except that the exposed GP was cold burnished with a small-ball burnisher

•Group III: poor obturation (spreader placed 5 mm short of WL), no further manipulation of GP

•Group IV: as group III except that the exposed GP was cold burnished with a small-ball burnisher

•The apical seal was investigated using a linear dye penetration technique and stereomicroscope.

Most highlighted Results:

•In well obturated canals: cold burnishing the apical GP resulted in significantly more dye penetration     ( Group 2 > Group 1)

•In poorly obturated canals: cold burnishing the apical GP resulted in significantly less dye penetration (Group 3 > Group 4)

Clinical significance: a well obturated GP has an better apical seal than poorly obturated