Found no significant difference in Px after 2
yrs. The size of the file and length of the
seperation didn't seem to be relevant.
Broken instrument
1970 (Natkin, Crump) 1997 (Altshul) 2010 (P
and retrearment
There were statistically more cracks
in the ultrasonic group than the no po
group.
yrs. The size of the file and length of the
seperation didn't seem to be relevant.
Broken instrument
1970 (Natkin, Crump) 1997 (Altshul) 2010 (P
and retrearment
There were statistically more cracks
in the ultrasonic group than the no po
group.