Jarvie Journal - College of Dental Medicine - Columbia University

The Journal of the William Jarvie Society
Effect Of A Glutaraldehyde-Based Dentin Desensitizing Agent
on the Retentive Strength of a Bioceramic Luting Cement
Fransiskus Andrianto 1 , Julio Espinoza 2 , Anthony Randi 2 *
1 Postgraduate Prosthodontic Program, College of Dental Medicine, Columbia University, NY, NY
Division of Prosthodontics, College of Dental Medicine, Columbia University, New York, NY
*Faculty Mentor
Introduction: Dentinal desensitizing agents are frequently utilized after tooth preparation to prevent
post-preparation sensitivity and prior to cementation to prevent post-cementation sensitivity.
Nanostructurally Integrating Bioceramic (NIB) luting cement has been introduced recently. This dental
material distinguishes itself from existing primary classes, such as resins and glass ionomers, and also
from water-based cements, such as zinc phosphate cement. Minimal information has been published
evaluating the retentive strength and solubility of this new class of luting cement
Objective: To evaluate the effect of a glutaraldehyde-based dentin desensitizing agent on the retentive
strength of this new class of luting cement compared to the other two self-etching resin cements.
Materials & Methods: 72 freshly extracted molars were embedded in a stainless steel mounting ring
with autopolymerizing acrylic resin. The occlusal surface of each mounted tooth was prepared flat 4 mm
above the CEJ. A high speed handpiece secured in a milling apparatus on a dental surveyor with a
diamond bur was oriented at an angle of 10º from a vertical axis to create a total convergence angle of
20º. The teeth were impressed with polyether and dies fabricated with type IV dental stone. Full crown
wax patterns were made. The crowns were cast in Type III gold alloy. Metal/Zirconia Primer was
applied in the internal surface of the castings, except for the Ceramir group. The teeth were divided into
three groups. Each group was subdivided into 2 groups of 12 teeth. One group of 12 acted as the control
for each cement. The other group received a gluteraldehyde desensitizig agent (Systemp®.desensitizer,
Ivoclar Vivadent). Group I – single-step self-etching resin cement: RelyX Unicem, Group II – two-step
self-etching resin cement: Multilink Automix and Group III – bioceramic luting cement: Ceramir.
Specimens were stored in water for 24 hours and thermo-cycled between 5º C and 55º C for 2500 cycles
with a 30-second dwell time. The crowns were subjected to an axial dislodgment force until failure using
a universal testing machine at a cross head speed of 1 mm/minute. Failure was defined as dislodgement
of the crown from the tooth preparation or fracture of the clinical crown or root. The force at
dislodgment was recorded.
Result: With the use of a glutaradeldehyde desensitizing agent, RelyX Unicem (37%) and Multilink
Automix (24%) demonstrated decrease in bond strength. Ceramir demonstrated 27% increase in bond
strength. Retentive results of the cements without desensitizing agents demonstrated bond strengths of
RelyX Unicem (913 N) > Multilink Automix (723 N) > Ceramir (470 N).
Conclusion: The use of a gluteraldehyde desensitizing agent decreased the retentive strength of selfetching
resin cements. RelyX Unicem exhibited higher failure loads than the 2-step Multilink Automix
system.
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