## 3 Results
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline \multicolumn{2}{c}{**Resorption (mm)**} & & \multicolumn{1}{c}{**0**} & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** \\ \hline Extrusion & T & a & 3.00 & 3.49 & 3.97 & 4.46 & 4.96 & 5.77 & 6.59 & 7.40 & 8.25 \\
0.6 N/60 gf & & m & 3.00 & 3.80 & 4.59 & 5.39 & 6.18 & 6.70 & 7.22 & 7.73 & 8.25 \\  & & **c** & 6.70 & 8.41 & 10.12 & 11.82 & 13.52 & 15.61 & **18.60** & **20.52** & **22.50** \\ \hline \multirow{6}{*}{1.2 N/120 gf} & VM & a & 2.60 & 3.04 & 3.47 & 3.91 & 4.35 & 5.06 & 5.77 & 6.49 & 7.20 \\  & & m & 2.60 & 3.31 & 4.01 & 4.72 & 5.42 & 5.87 & 6.32 & 6.77 & 7.20 \\  & & **c** & 5.82 & 7.33 & 8.84 & 10.35 & 11.85 & 14.10 & **16.34** & **18.59** & **19.61** \\ \hline \multirow{2}{*}{1.2 N/120 gf} & T & a & 6.00 & 6.98 & 7.95 & 8.93 & 9.92 & 11.54 & 13.18 & 14.81 & 16.50 \\  & & m & 5.99 & 7.59 & 9.18 & 10.77 & 12.37 & 13.40 & 14.43 & 15.47 & 16.50 \\  & & **c** & 13.41 & 16.82 & **20.23** & **23.64** & **27.05** & **31.22** & **37.20** & **41.04** & **45.00** \\ \hline \hline \end{tabular}
\end{table} 
Table 2: T and VM maximum stress average values (Kpa) produced by extrusion in PDL. For rotation (Figure 5, Table 4), qualitatively, the stressed areas were in the PDL cervical third, for all three loads, all criteria, and during the entire periodontal breakdown simulation. Quantitatively, rotation displayed the highest amount of stress among all five movements. In intact periodontitis experiencing up to 1.2 N, the orthodontic loads seemed safe to be applied (despite the stress in the cervical third doubling for 1.2 N). For 2.4 N, the cervical stress was up to 4.5 times higher than the MHP, suggesting a careful approach. Reduced periodontitis, experiencing 0.6 N, displayed only cervical third stress, exceeding the MHP (two-four times more, after a 4 mm loss). 1.2 N displayed a moderate (up to 2.4 times) exceedance of MHP in the middle third (after a 4 mm loss) and high overrun in the cervical third (3.1-8.5 times the MHP, after 1 mm loss). 2.4 N displayed, in the entire PDL, high exceedances of MHP after 1 mm of loss. For rotation movements, more than 1.2 N should be applied with care, especially in the presence of bone loss. Figure 4: Intrusion—Tresca and VM qualitative and quantitative stress display in PDL for 0.6 N (**A**), 1.2 N (**B**), and 2.4 N (**C**), and 0-, 4-, and 8-mm periodontal breakdowns. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multicolumn{2}{c}{**Resorption (mm)**} & & **0** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** \\ \hline \multirow{8}{*}{2.4 N/240 gf} & VM & a & 5.21 & 6.06 & 6.91 & 7.75 & 8.70 & 10.13 & 11.60 & 13.02 & 14.39 \\  & & m & 5.20 & 9.03 & 9.55 & 10.94 & 12.99 & 13.36 & 13.73 & 14.10 & 14.39 \\  & & c & 9.07 & 11.62 & 14.16 & 16.70 & **19.42** & **22.63** & **25.86** & **29.08** & **32.13** \\ \hline \multirow{2}{*}{2.4 N/240 gf} & T & a & 11.99 & 13.95 & 15.90 & **17.85** & **19.84** & **23.10** & **26.46** & **29.70** & **33.00** \\  & & m & 11.99 & **20.83** & **22.02** & **25.23** & **29.62** & **30.48** & **31.32** & **32.16** & **33.00** \\  & & c & **20.88** & **26.73** & **32.59** & **38.43** & **44.29** & **51.63** & **58.99** & **66.33** & **73.71** \\ \hline \multirow{8}{*}{2.4 N/240 gf} & VM & a & 10.42 & 12.12 & 13.81 & 15.51 & **17.40** & **20.26** & **23.20** & **26.04** & **28.78** \\  & & m & 10.40 & **18.07** & **19.10** & **21.89** & **25.97** & **26.72** & **27.46** & **28.20** & **28.77** \\  & & c & **18.15** & **23.23** & **28.33** & **33.40** & **38.83** & **45.27** & **51.72** & **58.15** & **64.25** \\ \hline Intrusion & T/VM \% & a & 1.15 & 1.15 & 1.15 & 1.15 & 1.14 & 1.14 & 1.14 & 1.14 & 1.15 \\  & & m & 1.15 & 1.15 & 1.15 & 1.15 & 1.14 & 1.14 & 1.14 & 1.14 & 1.15 \\  & & c & 1.15 & 1.15 & 1.15 & 1.15 & 1.14 & 1.14 & 1.14 & 1.14 & 1.15 \\ \hline \hline \end{tabular}  
T—Tresca, VM—Von Mises, a—apical third, —middle third, c—cereb third, T/VM—% increase.  
\end{table}