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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
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 > 1.5mma
0 mm > 1 mm > 1.5mma
   
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 > 1.5mma
0 mm > 1 mm > 1.5mma
0 mm > 1.5mma
0.5 mm > 1.5mma
1 mm > 1.5mma
  
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 < 1.5mma
0 mm < 1 mm < 1.5mma
0 mm < 0.5 mm < 1.5mma
0 mm < 1 mm < 1.5mma
  
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 < 1.5mma
0 mm < 1 mm < 1.5mma
0 mm < 0.5 mm < 1.5mma
0 mm < 1 mm < 1.5mma
  
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 < 1mma    
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
  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