Table 2. Mean and standard deviation (SD) descriptive statistics of marginal and internal gaps (µm) for LW, SM, and AM groups of premolar and molar (n = 10).

Measurement area	Premolar						P valuec	Molar						P valuec
	LW		SM		AM			LW		SM		AM
	Mean	SD	Mean	SD	Mean	SD		Mean	SD	Mean	SD	Mean	SD
Marginal gap	54.19a	36.23	51.44a	35.93	99.06b	60.53	.007	63.87a	39.32	48.73a	34.44	115.48b	62.57	.001
Chamfer gap	69.50ab	44.27	63.30a	38.40	107.75b	56.10	.011	75.62a	41.16	59.57a	33.52	124.35b	59.45	.001
Axial wall gap	102.63	30.85	85.43	43.19	90.81	34.83	.246	101.87	41.35	88.98	35.34	116.08	41.64	.173
Occlusal gap	117.78a	42.40	121.88a	35.78	202.07b	58.46	.001	156.97a	56.40	154.80a	46.37	274.26b	96.31	.000

LW, lost-wax; SM, subtractive manufacturing; AM, additive manufacturing; µ-SLA, micro-stereophotography.

^a.bValues in rows followed by the same letters among the LW, SM and AM groups, ^cKruskal-Wallis H test.