Effect of blood contamination on retention characteristics of MTA when mixed with different liquids

By Vanderweele RA, Schwartz SA, Beeson TJ

Date: 04/2007
Journal: JOE

Summary: 

Purpose: to evaluate the resistance to displacement of tooth-colored MTA when subjected to blood contamination and the use of different mixing liquids in a furcation perforation

N= 125 extracted mandibular and maxillary molars

Materials/Methods:

•Furcation perforations were created in 120 prepared tooth sections using a #2 round bur and two complete passes of a #5 Gates Glidden

•The teeth were then divided into 12 experimental groups based on contamination status, mixing liquid, and MTA setting time (Table 1 )

•Samples underwent Instron testing at either 24 or 72 hours and at 7 days

Most highlighted Results:

•All of the 72-hour samples displayed significantly greater resistance to displacement than the 24-hour samples.

•All the 7-day samples displayed significantly greater resistance to displacement than the 24-hour and 72-hour samples

Non-contaminated samples mixed with sterile water, lidocaine, or saline performed similarly at all time periods

•At 7 days, the resistance to displacement of the non-contaminated samples was significantly greater than that of the blood contaminated samples within each group

Clinical significance: it is recommended that bleeding be controlled at the perforation site before MTA perforation repair