Table 2. Subgroup analysis of the accuracy of the implant placement analysis (mean ± standard deviation).

	Protocol	Vertical (mm)	Angular (°)	Platform (mm)	Apex (mm)
(a) Accuracy of the implant placement based on the implanted sites
First molar	Modified	0.96 ± 0.37	3.68 ± 1.99	1.18 ± 0.31	1.62 ± 0.47
	Conventional	1.07 ± 0.32	4.24 ± 1.14	1.26 ± 0.28	1.89 ± 0.62
Second molar	Modified	0.53 ± 0.44	5.04 ± 1.86	1.66 ± 1.00	2.20 ± 0.61
	Conventional	0.65 ± 0.43	5.68 ± 2.60	1.71 ± 0.49	2.56 ± 0.98
(b) Accuracy of the implant placement based on the surgeons’ experience
Experts	Modified	0.96 ± 0.37	3.68 ± 1.99	1.18 ± 0.31	1.62 ± 0.47
	Conventional	1.07 ± 0.32	4.24 ± 1.14	1.26 ± 0.28*	1.89 ± 0.62*
Beginners	Modified	0.53 ± 0.44	5.04 ± 1.86	1.66 ± 1.00	2.20 ± 0.61
	Conventional	0.65 ± 0.43	5.68 ± 2.60	1.71 ± 0.49*	2.56 ± 0.98*
(c) Accuracy of the implant placement based the surgeons’ experience in the first molar site
Experts	Modified	0.81 ± 0.28	4.06 ± 2.59	1.11 ± 0.24	1.66 ± 0.55
	Conventional	1.06 ± 0.18	4.06 ± 1.49	1.26 ± 0.24	1.70 ± 0.39
Beginners	Modified	1.12 ± 0.41	3.31 ± 1.29	1.25 ± 0.38	1.58 ± 0.41
	Conventional	1.07 ± 0.45	4.43 ± 0.76	1.26 ± 0.34	2.09 ± 0.78
(d) Accuracy of the implant placement based the surgeons’ experience in the second molar site
Experts	Modified	0.27 ± 0.33+	5.42 ± 1.95	1.94 ± 0.38	2.33 ± 0.67
	Conventional	0.48 ± 0.41	4.54 ± 1.72	1.33 ± 0.29*	1.99 ± 0.70*
Beginners	Modified	0.80 ± 0.38+	4.67 ± 1.86	1.38 ± 0.38#	2.06 ± 0.58#
	Conventional	0.83 ± 0.42	6.83 ± 2.95	2.08 ± 0.35*,#	3.13 ± 0.92*,#

⁺ Statistical significance found between the experts and beginners within the modified protocol (P < .05).

^* Statistical significance found between the experts and beginners within the conventional protocol (P < .05).

^# Statistical significance found between the modified and conventional protocols within the beginners (P < .05).