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Table 2 Strains measured (Average ± SD) at the BU, BL, PU, and PL sites after loading with 9-kg weight at each point on teeth with NCCLs of various depths following restoration with resin composite

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

   Restored NCCL site
Loading point Depth Measurement site
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 53.67 ± 22.40 157.78 ± 61.40 − 236.56 ± 90.55 − 421.33 ± 84.92
1 mm 59.00 ± 23.60 172.22 ± 63.05 −237.89 ± 94.59 − 433.56 ± 103.34
1.5 mm 61.89 ± 21.60 174.89 ± 55.66 −237.00 ± 95.75 −412.11 ± 89.46
  P value 0.89 0.90 0.99 0.87
LI 0 mm 90.56 ± 18.51 514.67 ± 110.89 −305.89 ± 107.10 −792.44 ± 110.12
0.5 mm 90.89 ± 20.48 497.67 ± 97.36 −290.11 ± 118.41 − 770.67 ± 62.24
1 mm 92.56 ± 23.59 491.89 ± 134.78 −279.00 ± 107.76 − 754.33 ± 120.89
1.5 mm 105.56 ± 22.98 520.22 ± 106.23 −293.33 ± 110.05 − 733.11 ± 103.20
  P value 0.41 0.94 0.97 0.65
BC 0 mm −137.67 ± 7.07 −231.11 ± 36.29 39.22 ± 28.15 99.22 ± 46.75
0.5 mm − 151.56 ± 22.35 − 238.56 ± 31.77 44.33 ± 31.53 110.56 ± 43.07
1 mm − 154.22 ± 17.67 − 240.56 ± 38.33 46.11 ± 35.89 114.00 ± 60.06
1.5 mm −160.44 ± 7.18 − 232.00 ± 21.51 43.22 ± 29.69 107.78 ± 44.69
  P value 0.02 0.90 0.97 0.93
BI 0 mm −241.44 ± 23.62 −640.22 ± 13.36A 131.00 ± 80.29 542.67 ± 28.49
0.5 mm − 246.44 ± 42.75 − 632.78 ± 63.97A 133.22 ± 84.09 544.11 ± 75.44
1 mm − 244.56 ± 31.52 − 619.56 ± 38.81A 131.44 ± 82.43 544.22 ± 66.36
1.5 mm −198.11 ± 90.06 − 532.67 ± 86.55B 136.44 ± 90.57 539.00 ± 110.69
  P value 0.19 < 0.01* 0.10 0.10
   0 mm < 1.5 mm a
0.5 mm < 1.5 mm a
1 mm < 1.5 mm a
  
M 0 mm −18.11 ± 34.97 −71.22 ± 65.89 −32.44 ± 22.86 − 108.00 ± 28.43
0.5 mm −17.00 ± 31.50 −73.22 ± 79.63 −24.78 ± 23.80 −92.00 ± 43.12
1 mm −21.78 ± 38.36 −69.33 ± 79.30 −25.33 ± 28.36 −96.78 ± 45.82
1.5 mm −20.11 ± 33.14 −61.11 ± 56.10 −31.22 ± 22.31 −97.67 ± 25.91
  P value 0.99 0.99 0.87 0.83
D 0 mm −1.89 ± 13.66 −75.67 ± 71.41 −3.11 ± 23.98 −55.11 ± 106.91
0.5 mm 3.44 ± 19.78 −45.56 ± 38.02 −7.11 ± 25.03 −93.56 ± 112.10
1 mm 11.44 ± 12.53 −29.89 ± 67.47 −12.33 ± 45.38 − 114.67 ± 155.99
1.5 mm 3.89 ± 15.78 −31.89 ± 52.02 −10.89 ± 38.79 −95.22 ± 136.22
  P value 0.36 0.34 0.94 0.80
CO 0 mm −16.67 ± 16.49 −17.00 ± 63.67 − 105.22 ± 83.92 −185.56 ± 103.63
0.5 mm −17.89 ± 23.88 −14.11 ± 65.11 −97.22 ± 72.57 − 177.11 ± 84.51
1 mm −12.78 ± 14.53 −6.89 ± 57.89 −96.22 ± 83.49 −177.78 ± 91.49
1.5 mm −17.67 ± 18.18 −7.44 ± 58.64 −92.67 ± 80.92 − 164.56 ± 94.74
  P value 0.93 0.98 0.99 0.97
  1. 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
  2. a: the statistically significant differences (p < 0.05) by the post-hoc comparison of Tukey’s pairs comparison