Impact of endodontic case difficulty on operating time of single visit nonsurgical endodontic treatment under general anesthesia

Table 4 Operating time in minutes according to the case difficulty levels (Model 2) with inclusion of dental factors (categories B and C)

Tooth types	Case difficulty levels (Model 2^¶)						P values
	Minimal		Moderate		High
	N	Time (mean±SD)*	N	Time (mean±SD)	N	Time (mean±SD)
Anterior	18	33.7±10.0	51	44.0±12.0	11	47.6±10.0	0.00
Premolar	16	42.3±10.2	21	54.2±22.0	6	66.8±17.2	0.01
Molar	0	–	33	70.8±15.0	42	90.6±18.3	< 0.00
Total	34	37.7±10.8	105	54.5±19.2	59	80.2±24.0	< 0.00

^¶Endodontic case difficulty level was set with inclusion of the factors in two categories (B. diagnosis and treatment considerations and C. additional considerations)

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