Table 2: Effect of Extraction Method and Dwell Time on Degree of TR Post-Extraction
Number of Cases of Worsening TR Post-Extraction (n=84) Number of Cases of Same or Improved TR Post-Extraction (n=237) P Value
Extraction Method Extraction Method Extraction Method Extraction Method
Simple traction, n (%) 25 (29.8) 94 (39.7) 0.11
Extraction tools required, n (%) 59 (70.2) 143 (60.3)
Mechanical, n (%) 21 (25.0) 60 (25.3) 0.95
Laser, n (%) 31 (36.9) 47 (19.8) <0.01
Combination, n (%) 6 (7.1) 28 (11.8) 0.23
Laser + Combination, n (%) 37 (44.0) 75 (31.6) 0.04
Mechanical + Combination, n (%) 27 (32.1) 88 (37.1) 0.67
Unknown, n (%) 1 (1.2) 8 (3.4) 0.30
Average Dwell Time (Pre-extraction) Average Dwell Time (Pre-extraction) Average Dwell Time (Pre-extraction) Average Dwell Time (Pre-extraction)
Duration (years), mean ± SD 6.9 ± 13.1 6.0 ± 11.2 0.55