Influence of speed sintering on the fit and fracture strength of 3-unit monolithic zirconia fixed partial dentures

Conventional, Speed Sintering and High-Speed Sintering of Zirconia: A Systematic Review of the Current Status of Applications in Dentistry with a Focus on Precision, Mechanical and Optical Parameters

“…A further 10 studies were retrieved through manual search. All 15 studies included in the systematic review were in vitro studies [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ].…”

“…Precise marginal fit of restorations supports periodontal health, as properly fitted restorations prevent plaque accumulation compared to non-precise restorations. Studies by Rezende et al, Ahmed et al, Elisa Kauling et al and Nakamura et al evaluated the fit precision of speed sintered zirconia-based restorations compared to conventional sintered ones [ 16 , 17 , 18 , 27 ]. Ahmed et al [ 16 ] evaluated the margin fit using optical microscopy and reported that fast sintering resulted in greater marginal discrepancies of monolithic zirconia crowns than with the standard sintering protocol.…”

“…Ahmed et al [ 16 ] evaluated the margin fit using optical microscopy and reported that fast sintering resulted in greater marginal discrepancies of monolithic zirconia crowns than with the standard sintering protocol. However, the study carried out by Elisa Kauling et al showed after speed and conventional sintering of 3-unit zirconia FDPs using the replica technique a slightly superior fit in the marginal and occlusal areas of zirconia restorations sintered by speed processes compared to conventionally sintered ones [ 27 ]. When single abutment teeth were investigated, speed sintering showed a significantly better fit compared to the conventional sintering in premolars at the marginal gap and occlusal surface, and in molars at the occlusal surface.…”

“…They observed a not evenly distributed sintering shrinkage. The internal fit discrepancy was also not even, with the highest fit in the occlusal regions [ 27 ]. However, the marginal fit values were in the clinically acceptable range.…”

Clinical Feasibility of Fully Sintered (Y, Nb)-TZP for CAD-CAM Single-Unit Restoration: A Pilot Study

“…As an alternative to the conventional sintering protocol, high-speed sintering for dental zirconia with high temperature in the range of 1570–1590 °C was introduced; this may affect the mechanical properties by increasing the grain size [ 4 , 5 ]. Studies have shown contradictory findings regarding the effect of speed sintering on the mechanical properties, either increasing or decreasing the flexural strength of sintered zirconia [ 6 , 7 , 8 , 9 ]. Speed sintering was reported to have a variable influence on the strength, depending on the content of yttria [ 4 , 7 ].…”