An Evaluation of the Gap Sizes of 3-Unit Fixed Dental Prostheses Milled from Sintering Metal Blocks

Table 3

Mean ± standard deviation of each point of gap for two groups with results of the Mann-Whitney test (unit: μm).

Points		Premolar			Molar
		SMB	LWC	value	SMB	LWC	value
1	10	62.0 ± 22.7	59.4 ± 10.7	0.880	75.7 ± 36.8	98.0 ± 14.9	0.151
2	10	39.3 ± 17.6	55.6 ± 17.6	0.045	41.1 ± 15.0	48.7 ± 10.8	0.112
3	10	104.5 ± 21.0	79.3 ± 14.6	0.005	113.7 ± 20.1	82.7 ± 24.5	0.008
4	10	97.2 ± 17.8	79.0 ± 11.1	0.028	116.3 ± 20.0	75.8 ± 28.8	0.007
5	10	36.0 ± 12.3	50.0 ± 6.3	0.019	34.8 ± 8.3	59.0 ± 7.6	0.001
6	10	55.6 ± 21.3	68.1 ± 11.1	0.131	60.1 ± 29.1	76.2 ± 20.0	0.059
7	10	58.3 ± 22.0	71.4 ± 11.8	0.096	101.4 ± 36.0	74.2 ± 24.3	0.096
8	10	39.3 ± 15.1	62.3 ± 14.5	0.005	52.4 ± 12.0	52.0 ± 12.1	0.940
9	10	109.0 ± 36.2	86.6 ± 14.2	0.082	119.2 ± 29.1	83.4 ± 26.9	0.016
10	10	116.0 ± 33.6	90.2 ± 12.0	0.007	100.2 ± 17.3	102.7 ± 20.4	0.597
11	10	44.2 ± 11.4	63.6 ± 12.7	0.003	53.8 ± 17.2	51.3 ± 12.6	0.705
12	10	62.5 ± 22.6	70.0 ± 12.0	0.406	68.8 ± 28.5	83.4 ± 22.7	0.257
Total	120	68.6 ± 35.6	69.6 ± 16.9	0.139	78.1 ± 37.4	73.9 ± 25.6	0.852

SMB: sintering metal block (experimental group); LWC: lost-wax technique + casting (gold standard group).
The results of Mann-Whitney test.