Table 2. Mean volumetric wear amounts of the restorative materials and their opposing enamel for 0 – 3 months and 3 – 6 months.

Materials		Mean wear (mm3) (0 - 3 m)	SD	Mean wear (mm3) (3 - 6 m)	SD	Number of crowns
Restoration	EM	0.093743	0.102449	0.178314	0.140297	7
	GC	0.317533	0.154506	0.133683	0.04452	7
	VE	0.24912	0.142566	0.14046	0.091378	5
	VS	0.05105	0.067725	0.091275	0.074368	5
						Total: 24
Enamel	EM	0.158886	0.157061	0.101757	0.103038	7
	GC	0.127683	0.099608	0.211467	0.205868	7
	VE	0.23524	0.107804	0.16084	0.085647	5
	VS	0.1998	0.109431	0.0763	0.053577	5
						Total: 24