Table 1.

Outcomes for the mean differences between programmed and implemented IPR

Region	Tooth	n teeth	Programmed IPR (P-IPR)	Implemented IPR (I-IPR)	(P-IPR)-(I-IPR)	95% CI for mean IPR difference	p value
LOWER	LL5	9	0.22 ± 0.15	0.15 ± 0.16	0.07 ± 0.10	[− 0.008; 0.153]	0.0724
	LL4	34	0.20 ± 0.10	0.11 ± 0.14	0.09 ± 0.16	[0.031; 0.139]	0.0031**
	LL3	45	0.29 ± 0.17	0.14 ± 0.16	0.16 ± 0.20	[0.1; 0.218]	< .0001****
	LL2	46	0.35 ± 0.16	0.20 ± 0.16	0.14 ± 0.20	[0.077; 0.199]	< .0001****
	LL1	47	0.34 ± 0.16	0.17 ± 0.15	0.17 ± 0.18	[0.121; 0.227]	< .0001****
	LR1	47	0.34 ± 0.16	0.20 ± 0.15	0.13 ± 0.16	[0.085; 0.18]	< .0001****
	LR2	47	0.34 ± 0.17	0.18 ± 0.17	0.17 ± 0.22	[0.103; 0.23]	< .0001****
	LR3	42	0.30 ± 0.16	0.14 ± 0.18	0.17 ± 0.23	[0.096; 0.24]	< .0001****
	LR4	31	0.23 ± 0.11	0.14 ± 0.12	0.09 ± 0.15	[0.032; 0.141]	0.0030**
	LR5	14	0.38 ± 0.25	0.25 ± 0.19	0.12 ± 0.18	[0.02; 0.225]	0.0232*
	Overall	362	0.31 ± 0.17	0.17 ± 0.16	0.14 ± 0.19	[0.12; 0.16]	< .0001****
UPPER	UR5	8	0.45 ± 0.21	0.20 ± 0.17	0.25 ± 0.19	[0.095; 0.405]	0.0065**
	UR4	17	0.28 ± 0.13	0.15 ± 0.15	0.13 ± 0.16	[0.05; 0.216]	0.0038**
	UR3	24	0.25 ± 0.14	0.12 ± 0.19	0.12 ± 0.16	[0.051; 0.189]	0.0016**
	UR2	23	0.27 ± 0.16	0.18 ± 0.14	0.09 ± 0.16	[0.025; 0.165]	0.0104*
	UR1	27	0.28 ± 0.16	0.13 ± 0.11	0.16 ± 0.18	[0.086; 0.225]	< .0001****
	UL1	27	0.27 ± 0.17	0.13 ± 0.11	0.13 ± 0.19	[0.056; 0.204]	0.0013**
	UL2	22	0.27 ± 0.16	0.16 ± 0.19	0.11 ± 0.18	[0.028; 0.186]	0.0103*
	UL3	26	0.23 ± 0.13	0.15 ± 0.16	0.08 ± 0.18	[0.008; 0.154]	0.0313*
	UL4	19	0.27 ± 0.14	0.13 ± 0.11	0.14 ± 0.16	[0.061; 0.214]	0.0013**
	UL5	11	0.39 ± 0.22	0.19 ± 0.16	0.20 ± 0.12	[0.119; 0.283]	0.0003***
	Overall	204	0.28 ± 0.16	0.15 ± 0.15	0.13 ± 0.17	[0.105; 0.153]	< .0001****
LOWER + UPPER	Total number of teeth	566	0.30 ± 0.16	0.16 ± 0.16	0.14 ± 0.18	[0.121; 0.151]	< .0001****

LL5 lower left second premolar, LL4 Lower left first premolar, LL3 lower left canine, LL2 lower left lateral incisor, LL1 lower left central incisor, LR1 lower right central incisor, LR2 lower right lateral incisor, LR3 lower right canine, LR4 lower right first premolar, LR5 lower right second premolar, UR5 upper right second premolar, UR4 Upper right first premolar, UR3 Upper right canine,UR2 Upper right lateral incisor, UR1 Upper right central incisor,UL1 Upper left central incisor, UL2 Upper left lateral incisor, UL3 Upper left canine, UL4 Upper left first premolar, UL5 Upper left second premolar, IPR Interproximal reduction, P-IPR Programmed IPR, I-IPR Implemented IPR, CI Confidence interval

*P < .05; **P < .01; ***P < .001, ****P < .0001