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Table 5 Insertion torque values in participants with or without implant-root contact

From: Insertion torque recordings for the diagnosis of contact between orthodontic mini-implants and dental roots: a systematic review

Authors Model Insertion torque values compared for different subgroups
Motoyoshi et al. [6] Human patients 58 self-drilling without root contact: 7.1 ± 3.4 Ncm
7 self-drilling 1 point contact: 8.7 ± 3.0 Ncm
5 self-drilling multiple contacts: 8.1 ± 2.3 Ncm
58 pre-drilling without root contact: 6.8 ± 2.3 Ncm
7 pre-drilling 1 point contact: 7.4 ± 1.3 Ncm
8 pre-drilling multiple contacts: 7.7 ± 2.1 Ncm
Chen et al. [84] Mongrel dogs 25 pre-drilling without root contact 17.1 ± 5.9 Ncm
47 pre-drilling with root contact 19.9 ± 6.6 Ncm
Briscenoa [25] Beagle dogs 23 self-drilling without root contact 23.8 ± 3.6 Ncm
23 self-drilling with root contact 50.7 ± 7.2 Ncm
Wilmes et al. (a) [33] Mandibles of pig cadavers 147 pre-drilling without root contact: mean 16.6 ± 5.7 Ncm
50 pre-drilling with root contact: mean 18.5 ± 5.8 Ncm
Wilmes et al. (b) [33] Mandibles of pig cadavers 147 pre-drilling without root contact: mean 16.6 ± 5.7 Ncm
108 pre-drilling with root penetration: mean 21.9 ± 5.6 Ncm
McEwan (a) [32] Mandibles of pig cadavers 3M implants
10 self-drilling without root contact: mean 11.71 ± 0.9 Ncm
10 self-drilling with root contact: mean 17 ± 2.5 Ncm
10 self-drilling implants with root penetration were excluded because they did not further advance after root contact
McEwan (b) [32] Mandibles of pig cadavers Tomas implants
10 self-drilling without root contact: mean 8.76 ± 0.8 Ncm
7 self-drilling with root contact: mean 12.86 ± 1.2 cm
10 self-drilling implants with root penetration were excluded because they did not further advance after root contact
  1. Data obtained from the original manuscript are presented in black-type face print
  2. Data obtained through our contacting author protocol are italicized
  3. aThe reference author, Dr. PH Buschang, was contacted and reported that 23 implants were placed with root contact and 23 without. This information was inserted in Table 5, but does not completely explain what happened to 5 of the 56 inserted implants because in the original manuscript, only a loss of five (fractured) implants was reported