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

Table 3 Operating time in minutes related to case difficulty levels (Model 1) with inclusion of all factors (categories A, B, and C)

Tooth types	Case difficulty levels (Model 1^¶)						P value^§
	Minimal		Moderate		High
	N	Time (min)*	N	Time (mean±SD)	N	Time (mean±SD)
Anterior	2	35.0 ± 7.1	55	40.6 ± 12.5	23	46.6 ± 10.9	0.04
Premolar	0	–	27	47.1 ± 12.5	16	59.0 ± 26.0	0.10
Molar	0	–	28	70.4 ± 15.3	47	88.7 ± 18.6	< 0.00
Total	2	35.0 ± 7.1	110	49.8 ± 18.1	86	71.9 ± 26.4	< 0.00

^¶Endodontic case difficulty level was set with inclusion of the factors in three categories (A. patient considerations, B. diagnosis and treatment considerations, and C. additional considerations)
^§Groups of minimal and moderate levels were combined for analysis

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