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Table 3 Relative error

From: SEM characterization and ageing analysis on two generation of invisible aligners

Relative error

 

For LD30x

\(\varepsilon ^{{t_{x} }} _{{STXrel}} = \frac{{LD30X_{{t_{x} }} - \mu (LD30X_{{t_{0} }} )}}{{\mu (LD30X_{{t_{0} }} )}}\)

For EX30x

\(\varepsilon ^{{t_{x} }} _{{EXXrel}} = \frac{{EX30X_{{t_{x} }} - \mu (EX30X_{{t_{0} }} )}}{{\mu (EX30X_{{t_{0} }} )}}\)

Mean values

 

For LD30x

\(\mu (\varepsilon ^{{t_{1} }} _{{LD30Xrel}} )\); \(\mu (\varepsilon ^{{t_{2} }} _{{LD30Xrel}} )\);\(\mu (\varepsilon ^{{t_{3} }} _{{LD30Xrel}} )\)

For EX30x

\(\mu (\varepsilon ^{{t_{1} }} _{{EX30Xrel}} )\); \(\mu (\varepsilon ^{{t_{2} }} _{{EX30Xrel}} )\);\(\mu (\varepsilon ^{{t_{3} }} _{{EX30Xrel}} )\)

Standard deviation

 

For LD30x

\(\sigma (\varepsilon ^{{t_{1} }} _{{LD30Xrel}} )\); \(\sigma (\varepsilon ^{{t_{2} }} _{{LD30Xrel}} )\);\(\sigma (\varepsilon ^{{t_{3} }} _{{LD30Xrel}} )\)

For EX30x

\(\sigma (\varepsilon ^{{t_{1} }} _{{EX30Xrel}} )\); \(\sigma (\varepsilon ^{{t_{2} }} _{{EX30Xrel}} )\);\(\sigma (\varepsilon ^{{t_{3} }} _{{EX30Xrel}} )\)