Abstract
Statement of problem
Studies that evaluate the survival rate and load to fracture of premolars restored
with inlays produced using different methods are lacking.
Purpose
The purpose of this in vitro study was to compare the survival rate and fracture load
of premolars restored with inlays fabricated using different methods.
Material and methods
Thirty maxillary premolars were selected, embedded, and prepared to receive inlays
fabricated using different methods (n=10): LaCom-digital scanning with Lava C.O.S.
scanner (3M ESPE), followed by milling of composite resin block (Lava Ultimate; 3M
ESPE) in a milling unit; CeCom-digital scanning with Cerec 3D Bluecam scanner (Dentsply
Sirona), followed by milling of a Lava Ultimate block in Cerec (Dentsply Sirona);
PresDis-impression with polyvinyl siloxane, inlay made using the lost wax technique,
and IPS e.max Press (Ivoclar Vivadent AG) pressed ceramic (lithium disilicate). A
dual-polymerizing resin cement system was used to lute the inlays. Inlays were mechanically
cycled (2 Hz, 106 mechanical pulses, 80 N) after 24 hours, and the specimens were stored in distilled
water at 37°C for 11 months. Then, a fatigue test was conducted using a 10-Hz frequency
and 400-N load on the inner inclines of the cusps. The test was complete when the
specimen fractured or when the specimen reached 1.5×106 cycles. The specimens that survived fatigue testing were submitted to a single-load
fracture test in a universal testing machine and analyzed using a stereoscope for
failure classification. Survival rates were estimated using the Kaplan-Meier method
and log-rank test (Mantel-Cox). Fracture load data were analyzed using 1-way ANOVA
(α=.05).
Results
No significant differences were detected among the groups for the survival rate (P=.87) or for the load to fracture (P=.78). Most failures were longitudinal, catastrophic fractures.
Conclusions
Premolars restored with inlays fabricated using the tested methods had similar survival
rates and loads to fracture.
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Article info
Publication history
Published online: August 07, 2018
Identification
Copyright
© 2018 by the Editorial Council for The Journal of Prosthetic Dentistry.
