Ultrasonic root-end preparation Part 2, Microleakage of EBA root-end fillings

By Saunders WP, Saunders EM, Gutmann JL

Date: 11/1995
Journal: JOE


Purpose: To evaluate the effect of 3 methods of root-end preparation, on the apical seal of EBA root-end fillings

 N= =   120 single rooted human teeth with mature apices


•Teeth prepared chemo-mechanically, obturated with gutta percha, and resected with a diamond bur

•Sample divided into 3 groups:

•G1: Root end prep using 010 round bur in slow speed with water for 2-3 mm depth

•G2: As G1, cavities were flushed with 10% citric acid & 3% ferric chloride •G3: Root end prep using ultrasonic tip  for 2-3 mm depth

•The root end was restored with an EBA cement

EBA cement consists of: a powder of 60% zinc oxide. 34% silicon dioxide and 6% natural resin; mixed with a liquid of 62.5% ortho ethoxybenzoic acid and 37.5% engenol

•The 3 groups tested for leakage with Indian ink dye after demineralization using a stereoscopic microscope; after 7 days & 7 months

•The degree of leakage: 0 = no leakage; I. up to 0.5 mm; 2. > 0.5-1.0 mm; 3. > 1.0-2.0 mm; and 4. > 2.0

Most highlighted Results:

1.For each technique, there was significantly more leakage after 7 months than 7 days

2.There was no significant difference in leakage between the groups at each time interval 3.There was significantly more cracking in teeth prepared with the ultrasonic instrument

Clinical significance:

Leakage of EBA root-end fillings occurred with different methods used for apical cavity preparation