Date of Completion


Embargo Period



Qiang Zhu, D.D.S., Ph D., Kamran Safavi D.M.D., M.Ed., Yu-Hsiung Wang, D.D.S., Ph.D

Field of Study

Dental Science


Master of Dental Science

Open Access

Open Access



Introduction:The aim of this study is to determine whether the insertion rate of the Dentsply/Sirona Guttacore obturation product with Dentsply AH Plus sealer has an effect on 1. the extrusion amount of the obturating materials and 2. the extrusion probability of the obturating materials out of root canal apex.

Methods:Thirty root canal simulating plastic blocks were prepared with Waveone Gold nickel titanium rotary files to a size “primary” file. The prepared blocks were divided into three groups: group 1 was obturated using GuttaCore size primary obturator (analogous to the reciprocating file size) at a rate of 1 seconds; group 2 was obturated at a rate of 7 seconds; and group 3 was obturated at a rate of 16 seconds. The results were statistically analyzed by evaluating the amount and the probability of the obturating material extrusion.

Results:The average amount of the extruded obturation material was .44 mg (Group 1), .22 mg (Group 2) and .17 mg (Group 3). The probability of the obturation material extrusion was 60% (group 1), 30% (Group 2) and 22% (Group 3). There are no statistical differences for the amount of extruded obturation materials among the three groups (P>0.05). There are also no statistical differences for the probability of the obturation material extrusion among the three groups (P>0.05).

Conclusion:This study suggests that the insertion rates of the Guttacore obturator have no effect on the extrusion of theobturation materials.

Major Advisor

Qiang Zhu, D.D.S., Ph D.