Influence of cavity depth and restoration of non-carious cervical root lesions on strain distribution from various loading sites

Du, Je-Kang; Wu, Ju-Hui; Chen, Ping-Ho; Ho, Pei-Shan; Chen, Ker-Kong

doi:10.1186/s12903-020-01083-w

Table 1 The comparison of strains measured (Average ± SD) at BU, BL, PU, and PL sites after loading 9 kg at each loading point on teeth with NCCLs of various depths

From: Influence of cavity depth and restoration of non-carious cervical root lesions on strain distribution from various loading sites

		Unrestored NCCL site
Loading point	Depth	Measurement site
Loading point	Depth	BU	BL	PU	PL
LC	0 mm	57.89 ± 22.02	159.44 ± 60.82	− 251.33 ± 101.98	− 447.44 ± 99.91
	0.5 mm	47.89 ± 19.96	162.22 ± 70.09	− 243.00 ± 97.31	− 438.22 ± 104.30
	1 mm	35.11 ± 17.83	146.78 ± 64.38	− 249.56 ± 106.94	− 463.56 ± 118.87
	1.5 mm	20.11 ± 17.24	92.44 ± 48.37	− 250.22 ± 110.45	− 453.00 ± 100.31
	P value	< 0.01*	0.08	0.10	0.97
		0 mm > 0.5 mm > 1.5mm^a 0 mm > 1 mm > 1.5mm^a
LI	0 mm	90.56 ± 18.508	514.67 ± 110.89	− 305.89 ± 107.10	− 792.44 ± 110.12
	0.5 mm	68.78 ± 21.534	420.22 ± 128.69	− 279.11 ± 136.24	− 699.22 ± 141.63
	1 mm	47.11 ± 18.286	379.44 ± 85.86	− 294.44 ± 112.93	−759.44 ± 102.09
	1.5 mm	8.78 ± 20.024	269.89 ± 111.10	− 293.22 ± 110.30	− 784.56 ± 100.39
	P value	< 0.001**	< 0.01*	0.97	0.32
		0 mm > 0.5 mm > 1.5mm^a 0 mm > 1 mm > 1.5mm^a	0 mm > 1.5mm^a 0.5 mm > 1.5mm^a 1 mm > 1.5mm^a
BC	0 mm	− 137.67 ± 7.07	− 231.11 ± 36.29	39.22 ± 28.15	99.22 ± 46.75
	0.5 mm	−133.89 ± 15.17	− 230.11 ± 58.99	47.00 ± 37.67	115.89 ± 63.38
	1 mm	− 103.00 ± 10.32	−172.78 ± 45.63	49.22 ± 39.66	118.56 ± 64.31
	1.5 mm	−70.56 ± 24.83	−94.56 ± 51.72	57.33 ± 36.68	151.33 ± 55.20
	P value	< 0.001**	< 0.001**	0.76	0.30
		0 mm < 0.5 mm < 1.5mm^a 0 mm < 1 mm < 1.5mm^a	0 mm < 0.5 mm < 1.5mm^a 0 mm < 1 mm < 1.5mm^a
BI	0 mm	− 241.44 ± 23.6	− 640.22 ± 13.36A	131.00 ± 80.29	542.67 ± 28.49
	0.5 mm	−206.44 ± 28.25	− 595.00 ± 82.90B	134.11 ± 82.38	546.67 ± 68.15
	1 mm	− 197.22 ± 51.34	− 539.56 ± 95.86B	136.22 ± 79.68	577.56 ± 49.03
	1.5 mm	−93.78 ± 41.351	− 316.89 ± 124.60C	158.67 ± 80.30	636.33 ± 33.06
	P value	< 0.001**	< 0.001**	0.88	< 0.01*
		0 mm < 0.5 mm < 1.5mm^a 0 mm < 1 mm < 1.5mm^a	0 mm < 0.5 mm < 1.5mm^a 0 mm < 1 mm < 1.5mm^a
M	0 mm	−18.11 ± 34.97	−71.22 ± 65.89	−32.44 ± 22.86	− 108.00 ± 28.43
	0.5 mm	−13.22 ± 34.19	−65.11 ± 85.81	− 25.78 ± 25.97	−91.89 ± 40.96
	1 mm	−10.89 ± 25.55	−62.11 ± 67.77	−21.11 ± 24.59	−80.00 ± 41.38
	1.5 mm	2.89 ± 11.57	−36.00 ± 37.71	−24.89 ± 22.91	−76.78 ± 18.01
	P value	0.44	0.69	0.79	0.21
D	0 mm	−1.89 ± 13.66	−75.67 ± 71.41	−3.11 ± 23.98	−55.11 ± 106.91
	0.5 mm	5.78 ± 15.98	−45.11 ± 44.97	−4.67 ± 29.07	−85.78 ± 119.26
	1 mm	17.89 ± 5.18	−27.33 ± 44.23	−10.89 ± 35.04	−105.44 ± 130.93
	1.5 mm	9.44 ± 7.59	−20.89 ± 31.74	−2.56 ± 32.04	−86.44 ± 125.39
	P value	< 0.01*	0.11	0.93	0.85
		0 mm < 1mm^a
CO	0 mm	−16.67 ± 16.49	−17.00 ± 63.67	−105.22 ± 83.92	− 185.56 ± 103.63
	0.5 mm	−15.22 ± 24.71	− 14.67 ± 73.56	−93.11 ± 71.90	− 169.67 ± 96.90
	1 mm	−2.78 ± 14.44	8.11 ± 45.96	−88.11 ± 60.87	−188.22 ± 88.48
	1.5 mm	−6.33 ± 10.25	1.11 ± 36.58	−86.67 ± 73.78	− 160.33 ± 89.43
	P value	0.27	0.74	0.95	0.91

SD standard deviation, BU a strain gauge was fixed to the coronal bucco-cervical region with the tip at the cemento-enamel junction (CEJ) (considered as the occlusal margin of the NCCL), BL the strain gauge was fixed at the root bucco-cervical region with the tip 1.5 mm from the CEJ (considered as the gingival margin of the NCCL), PU the strain gauge was fixed at the coronal palato-cervical region with the tip at the CEJ, PL the strain gauge was fixed at the root palato-cervical region with the tip at the CEJ, NCCLs Non-carious cervical lesions
^a: the statistically significant differences (p < 0.05) by the post-hoc comparison of Tukey’s pairs comparison

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