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. Author manuscript; available in PMC: 2023 Jun 1.
Published in final edited form as: J Esthet Restor Dent. 2022 Mar 21;34(4):633–640. doi: 10.1111/jerd.12907

Table 2.

Mean and standard deviation of fracture load in newtons of zirconia crowns as a function of yttria content after two aging methods.

Zirconia Content Aging Method
Thermocycling Only Thermo-Mechanical Loading
3Y-PSZ 3728.6±463.1 A,a 3708.4±479.9 A,a
4Y-PSZ 3309.9±397.0 B,b 3172.9±427.6 B,b
5Y-PSZ/3Y-PSZ 2597.8±333.5 C,c 2461.3±332.1 C,c
5Y-PSZ/4Y-PSZ 2591.1±503.4 C,c 2393.6±270.0 C,c

- Capitol letter superscript indicates statistical significance in fracture resistance as a function of yttria content (p<0.05).

- Lower case letter superscript indicates statistical significance in fracture as a function of aging method (p<0.05).