IADR Abstract Archives
The antibacterial effect of various provisional cement removal techniques
Objectives: Provisional crowns comprise a considerable part of the prosthetic treatment. Although the provisional crown is cemented to the abutment tooth, bacterial microleakage always occurs and may compromise the treatments' prognosis. A variety of methods for decreasing the bacterial load around the provisional restorations have been investigated. As the provisional restoration is frequently removed, cleaned and cemented again, having an antibacterial effect of the cement removal process may be advantageous, cost effective and an easy approach to improve the health of the surrounding tissues
Methods: Thirty provisional crowns fabricated (n=15 100µm and n=15 250 µm spacer) were cemented using Temp-Bond® provisional cement on standardized dies. The samples were immersed in a bacterial suspension for 24 hrs. The crowns were then detached from the die and the provisional cement was removed using: immersion in Temp-off™, mechanical cleaning using a dental explorer or sandblasting. The antibacterial effect of the removal technique was evaluated by imprinting of the crowns margins on a blood agar plates, by viable count (CFU/mL) and by scanning electron microscopy. Similar evaluation was preformed on Temp-Bond NE®. The data were analyzed to determine the significance of the differences in bacterial growth between the study groups.
Results: Cement removal using Temp-off™ showed a significant reduction in viable cell count compared to cement removal using an explorer or sandblast (p<0.05). Lower viable cell counts were seen in crowns with 250 µm spacing (p<0.05). No significant difference was found between Temp-Bond ® and Temp-Bond NE® groups.
Conclusions: Temp-off™ solvent to remove temporary cement reduces bacterial contamination of the intaglio surface of provisional crowns when compared to other removal techniques. These findings imply that the use of Temp-off™ may be beneficial in routine daily practice.
Methods: Thirty provisional crowns fabricated (n=15 100µm and n=15 250 µm spacer) were cemented using Temp-Bond® provisional cement on standardized dies. The samples were immersed in a bacterial suspension for 24 hrs. The crowns were then detached from the die and the provisional cement was removed using: immersion in Temp-off™, mechanical cleaning using a dental explorer or sandblasting. The antibacterial effect of the removal technique was evaluated by imprinting of the crowns margins on a blood agar plates, by viable count (CFU/mL) and by scanning electron microscopy. Similar evaluation was preformed on Temp-Bond NE®. The data were analyzed to determine the significance of the differences in bacterial growth between the study groups.
Results: Cement removal using Temp-off™ showed a significant reduction in viable cell count compared to cement removal using an explorer or sandblast (p<0.05). Lower viable cell counts were seen in crowns with 250 µm spacing (p<0.05). No significant difference was found between Temp-Bond ® and Temp-Bond NE® groups.
Conclusions: Temp-off™ solvent to remove temporary cement reduces bacterial contamination of the intaglio surface of provisional crowns when compared to other removal techniques. These findings imply that the use of Temp-off™ may be beneficial in routine daily practice.