Table 3.

GEE analysis assessing the effect of material on surface wear adjusted for time

Surface wear	Coefficient	P value	95% confidence interval
Duran 1.5 mm (base comparison)	Reference
Duran 1 mm	0.70	0.98	− 79.76	81.17
Essix C +	89.19	0.01	21.24	157.13
Vivera	9.46	0.84	− 80.56	99.49
Zendura	302.44	0.00	204.92	399.95
Pre-wear (base comparison)	Reference
Post-wear	101.38	0.00	65.58	137.18