## 3 Results
### Tipping (Figure 7, Table 6)
\begin{table}
\begin{tabular}{l l c c c c c c c c c} \hline \hline
**Resorption (mm)** & & **0** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** \\ \hline Tipping & Structure & & **366.10** & **380.40** & **394.80** & **409.15** & **423.50** & **453.60** & **483.80** & **513.90** & **544.10** \\
0.6 N/60 gf & Tooth + bracket & a & 61.67 & 112.85 & 164.03 & 215.20 & 266.41 & 299.20 & 331.90 & 364.70 & 397.60 \\ Stress & & m & 61.67 & 134.95 & 208.20 & 281.50 & 354.80 & 387.50 & 420.30 & 453.10 & 485.90 \\ Amount & & c & 122.61 & 180.60 & 238.70 & 296.70 & 354.80 & 365.50 & 376.20 & 386.90 & 397.60 \\ In each & & C & 305.20 & 317.60 & 330.00 & 342.50 & 354.80 & 365.50 & 376.20 & 386.20 & 397.60 \\ Component & Tooth & a & 61.67 & 96.35 & 128.00 & 162.70 & 196.40 & 243.70 & 291.00 & 338.36 & 385.70 \\  & & m & 61.67 & 119.90 & 178.10 & 236.40 & 294.70 & 336.75 & 378.80 & 420.80 & 462.92 \\  & & c & 122.61 & 165.60 & 208.60 & 251.60 & 294.70 & 317.40 & 340.20 & 362.90 & 385.70 \\  & & C & 244.10 & 248.50 & 253.00 & 252.740 & 261.90 & 273.50 & 285.20 & 296.90 & 308.60 \\  & & m & 60.01 & 89.00 & 118.00 & 147.00 & 176.00 & 228.50 & 281.00 & 333.50 & 386.00 \\  & & m & 60.01 & 99.92 & 139.84 & 179.75 & 219.66 & 280.48 & 341.29 & 402.11 & 462.92 \\  & & c & 118.61 & 154.76 & 190.91 & 227.06 & 263.21 & 293.91 & 324.61 & 355.30 & 386.00 \\  & & C & 60.01 & 61.76 & 63.51 & 65.26 & 67.01 & 69.85 & 72.70 & 75.54 & 78.38 \\ Bone & & a & 73.27 & 78.48 & 83.70 & 88.92 & 94.14 & 97.81 & 101.50 & 105.17 & 108.85 \\  & & m & 73.27 & 78.48 & 83.70 & 88.92 & 94.14 & 97.81 & 101.50 & 105.17 & 108.85 \\  & & c & 146.53 & 156.97 & 167.41 & 177.85 & 188.29 & 195.64 & 202.99 & 210.34 & 217.69 \\ NVB & NVB & 1.47 & 1.82 & 2.18 & 2.53 & 2.88 & 3.28 & 3.69 & 4.09 & 4.49 \\ Pulp & & a & 0.13 & 0.17 & 0.19 & 0.23 & 0.25 & 0.29 & 0.33 & 0.36 & 0.39 \\  & & c & 0.15 & 0.18 & 0.21 & 0.23 & 0.25 & 0.29 & 0.33 & 0.36 & 0.39 \\ PDL & & a & 1.55 & 2.36 & 3.16 & 3.96 & 4.78 & 5.65 & 6.52 & 7.39 & 8.26 \\  & & m & 3.06 & 4.07 & 5.09 & 6.10 & 7.11 & 8.42 & 9.73 & 11.03 & 12.34 \\  & & c & 12.13 & 15.55 & 18.96 & 22.38 & 25.79 & 30.57 & 35.35 & 40.13 & 44.91 \\ \hline Tipping & Structure \% & & **100** & **100** & **100** & **100** & **100** & **100** & **100** & **100** & **100** \\
0.6 N/60 gf & Tooth + bracket \% & a & **16.84** & **29.67** & **41.55** & **52.60** & **62.91** & **65.96** & **68.60** & **70.97** & **73.07** \\ Stress \% & & m & 16.84 & 35.48 & 52.74 & 68.80 & 83.78 & 85.43 & 86.87 & 88.17 & 89.30 \\ Reaching & & c & 33.49 & 47.48 & 60.46 & 72.52 & 83.78 & 80.58 & 77.76 & 75.29 & 73.07 \\ Each & & C & **83.37** & **83.49** & **83.59** & **83.71** & **83.78** & **80.58** & **77.76** & **75.15** & **73.07** \\ Component & Tooth \% & a & **16.84** & **25.33** & **32.42** & **39.77** & **46.38** & **53.73** & **60.15** & **65.84** & **70.89** \\  & & m & 16.84 & 31.52 & 45.11 & 57.78 & 69.59 & 74.24 & 78.30 & 81.88 & 85.08 \\  & & c & 33.49 & 43.53 & 52.84 & 61.49 & 69.59 & 69.97 & 70.32 & 70.62 & 70.89 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Maximum stress average values (KPa) produced by orthodontic forces in tooth structure and dentine-cement. In intact periodontitis, both forces (0.6 and 1.2 N) seem to be safe for application (lower than MHP). Nevertheless, in reduced periodontium, 0.6 N of the applied force produced a cervical third PDL stress that is higher than physiological MHP (i.e., after 2-5 mm of loss, with higher resorptive risks). A force of 2.4 N exceeded the physiological MHP for all movements and bone levels, thus ischemic and resorptive risks are the highest (Figure 8 and Table 7). Nevertheless, the stress absorption-dissipation pattern displayed by the other two lower loads remained constant.