Effect of spreader and accessory cone size on density of obturation using conventional or mechanical lateral condensation.  

By Gound TG, Riehm RJ, Odgaard EC, Makkawy H.

Date: 10/2001
Journal: JOE


To compare depth of accessory cone penetration and the volume of gutta-percha compacted into a standard canal when MLC or CLC are used with various spreader-accessory cone combinations.

•CLC: pressure is maintained on the SS spreader for 10 to 60 s to allow the gutta-percha to deform before the spreader was removed

•MLC: the NiTi spreader is removed after about 5 s of reciprocating action at the final depth of penetration.


-Simulated curved root canal in a resin block was enlarged to size 40 and used to compare the depth of accessory cone penetration and weight of obturation occurring with the use of different obturation techniques and spreader-accessory cone combinations.

– Twelve groups, each consisting of 10 obturations.

– A conventional lateral condensation technique was used in six groups.

– Mechanical lateral condensation (MLC) technique was used in six matched groups.

– The six spreader-accessory cone combinations were either Fine-Medium or Fine nickel-titanium finger spreaders with either Fine, Medium-Fine, or size 25 accessory cones. -Seven accessory cones were placed in every obturation.

– The depth of each accessory cone penetration into the canal was measured.

– After each obturation the gutta-percha was removed, sectioned, and the resulting mass was weighed.

Most highlighted Results:

• MLC fills were significantly heavier and had greater depth of penetration on average than conventional lateral condensation.

•The best combination for heavy fills was MLC, Fine-Medium spreaders, and Fine accessory cones.

•The greatest mean accessory cone depth occurred with MLC, Fine-Medium spreaders, and size 25 accessory cones.