Computerized Casts for Orthodontic Purpose Using Powder-Free Intraoral Scanners: Accuracy, Execution Time, and Patient Feedback

Table 1

Descriptive statistics of accuracy (mm) of three different measurements (conventional measurement, digital measurement, and digitalization of gypsum model).

Measurements	Group	Model	Mean	SD	Min	Median	Max	Significance
Upper arch	(1A)	Gypsum	30.35	2.28	24.8	31	32.5
	(1B)	Digitalized gypsum	28.9	2.72	21.72	29.43	32.25	ns
	(2)	Digital	29.46	2.66	22.66	29.9	33.18
Lower arch	(1A)	Gypsum	28.06	1.63	24.5	28.65	30
	(1B)	Digital gypsum	28.07	1.39	25.09	28.15	30.33	ns
	(2)	Digital	28	1.30	25.23	28.2	29.99
Intercanine upper	(1A)	Gypsum	34.03	1.83	31.4	33.7	37.6
	(1B)	Digital gypsum	34	1.84	30.77	33.54	37.46	ns
	(2)	Digital	33.8	1.93	31.15	33.54	36.76
Intercanine lower	(1A)	Gypsum	25.87	2.15	22	25.63	31
	(1B)	Digital gypsum	25.96	1.99	21.54	25.61	29.95	ns
	(2)	Digital	25.64	2.01	21.98	25.51	30.05
Intermolar upper	(1A)	Gypsum	40.78	2.12	36.9	40.85	45.5
	(1B)	Digital gypsum	40.53	2.40	36.98	40.1	46.25	ns
	(2)	Digital	40.36	2.24	37.37	40.04	46.11
Intermolar lower	(1A)	Gypsum	39.05	3.48	31	39.55	45.2
	(1B)	Digital gypsum	38.93	3.36	31.66	39.88	45.65	ns
	(1B)	Digital gypsum	38.93	3.36	31.66	39.88	45.65