TABLE 3.

Mean score of five scales concerning the denture complaints (possible range 0–3), mean scores of chewing ability of soft, tough, and hard food (possible range 0–2) and overall satisfaction score (possible range 1–10) before and 5 and 10 years after treatment and significance level of differences (p < .05) between the groups

	Pre‐treatment			5 years			10 years
	4‐Implant group (n = 33)	6‐Implant group (n = 33)	p Value	4‐Implant group (n = 29)	6‐Implant group (n = 31)	p Value	4‐Implant group (n = 26)	6‐Implant group (n = 20)	p Value
Functional complaints about upper denture (SD)	1.5 (0.6)	1.7 (0.5)	0.099	0.1 (0.1)	0.2 (0.2)	0.212	0.2 (0.2)	0.3 (0.5)	0.305
Functional complaints in general (SD)	1.0 (0.5)	1.1 (0.5)	0.132	0.1 (0.1)	0.1 (0.1)	0.106	0.1 (0.2)	0.2 (0.5)	0.258
Facial aesthetics (SD)	1.1 (0.9)	1.1 (1.0)	0.828	0.1 (0.3)	0.4 (0.7)	0.052	0.3 (0.4)	0.3 (0.7)	0.914
“Neutral Space” (SD)	0.6 (0.6)	0.5 (0.7)	0.408	0.4 (0.4)	0.2 (0.4)	0.055	0.5 (0.4)	0.3 (0.5)	0.215
Aesthetics (SD)	0.4 (0.3)	0.4 (0.4)	0.877	0.1 (0.2)	0.1 (0.2)	0.508	0.2 (0.3)	0.2 (0.5)	0.607
Soft food (SD)	0.4 (0.4)	0.4 (0.4)	0.632	0.0 (0.0)	0.0 (0.1)	0.338	0.0 (0.1)	0.1 (0.2)	0.422
Tough food (SD)	1.0 (0.5)	1.2 (0.6)	0.332	0.1 (0.3)	0.1 (0.3)	0.688	0.1 (0.2)	0.1 (0.4)	0.823
Hard food (SD)	1.8 (0.4)	1.8 (0.5)	0.730	0.2 (0.5)	0.4 (0.5)	0.140	0.2 (0.4)	0.5 (0.7)	0.024
Overall satisfaction score (SD)	4.4 (1.7)	3.9 (1.5)	0.188	8.6 (0.7)	8.8 (0.9)	0.467	8.7 (0.8)	8.6 (1.6)	0.699

Note: Differences between study groups were tested with the independent Student's t test.