Insertion torque values and success rates for paramedian insertion of orthodontic mini-implants

Leonardo, Bruno Di; Ludwig, Björn; Lisson, Jörg A.; Contardo, Luca; Mura, Rossano; Hourfar, Jan

doi:10.1007/s00056-018-0120-x

Cited by 21 publications

(16 citation statements)

References 38 publications

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“…Therefore, when we consider the primary stability of a mini-screw, we must relate it to different factors such: bone density [ 6 , 10 ], cortical thickness [ 5 , 21 ], the inclination of insertion [ 7 , 11 ] and insertion torque [ 17 ]. The influence of many of these factors can, hence, as emerges from our study, be minimized with a two-miniscrew system, where load and torsion forces are best issued.…”

Section: Discussionmentioning

confidence: 99%

“…Success rates are between 70 and 100% [ 10 , 11 , 12 ], with an overall failure rate of 13.5% [ 13 , 14 , 15 , 16 ]. In the past, different solutions such as using a larger-diameter miniscrew, changing the insertion site [ 17 , 18 , 19 ] or secondary insertion [ 20 , 21 ] have been analyzed to overcome the loss of stability. We hypothesized that adding a second miniscrew could increase the anchorage reducing the risk of movements under the orthodontic load of the proximal miniscrew.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Evaluation of the Stability of One or Two Miniscrews under Loading on Synthetic Bone

Pradal

Nucci

Derton

et al. 2020

JFB

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The aim of the present study was to evaluate the primary stability of a two-miniscrew system inserted into a synthetic bone and to compare the system with the traditional one. Forty-five bi-layered polyurethane blocks were used to simulate maxillary cancellous and cortical bone densities. Samples were randomly assigned to three groups—one-miniscrew system (Group A, N = 23), two-miniscrew system (Group B, N = 22) and archwire-only (Group C, N = 10). A total of 67 new miniscrews were subdivided into Group A (23 singles) and Group B (22 couples). 30 mm of 19″ × 25″ archwires were tied to the miniscrew. The load was applied perpendicularly to the archwire. Maximum Load Value (MLV), Yield Load (YL) and Loosening Load (LL) were recorded for each group. The YL of Group B and C had a mean value respectively of 4.189 ± 0.390 N and 3.652 ± 0.064 N. The MLV of Group A, B and C had a mean value respectively of 1.871 ± 0.318N, of 4.843 ± 0.515 N and 4.150 ± 0.086 N. The LL of Group A and B had a mean value respectively of 1.871 ± 0.318 N and of 2.294 ± 0.333 N. A two- temporary anchorage device (TAD) system is on average stiffer than a one-TAD system under orthodontic loading.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical Evaluation of the Stability of One or Two Miniscrews under Loading on Synthetic Bone

Pradal

Nucci

Derton

et al. 2020

JFB

Self Cite

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“…Some studies have reported that a higher insertion torque may lead to a higher failure rate 44 ; however, no significant difference was observed in other studies. 45…”

Section: Greater Palatine Nerve and Vessel Pathwaymentioning

confidence: 99%

Palatal temporary skeletal anchorage devices (TSADs): What to know and how to do?

Ahn

Kang

Jeong

et al. 2020

Orthod Craniofacial Res

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“…Several factors, including bone density, OAS diameter, OAS length and anchorage method, affect torque during the OAS procedure [ 9 , 10 , 11 ]. Specifically, bone stability affects the success and failure rate via the insertion torque [ 7 , 12 , 13 ]. In addition, bone density is related to the stability and retention of OASs [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Orthodontic Anchor Screw Anchorage Method on the Stability of Artificial Bone: An In Vitro Study

Kang

Hyoungsik

et al. 2020

Materials

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This study aims to compare the torque values for various lengths of the titanium-based orthodontic anchor screw (OAS), different anchorage methods and varying artificial bone densities after predrilling. Furthermore, the effects of these parameters on bone stability are evaluated. A total of 144 OASs were prepared with a diameter of 1.6 mm and heights of 6, 8 and 10 mm. Artificial bones were selected according to their density, corresponding to Grades 50, 40 and 30. Torque values for the automatic device and manual anchorage methods exhibited a statistically significant difference for the same-sized OAS, according to the bone density of the artificial bones (p < 0.05). However, when insertion torque was at the maximum rotations, there was no significant difference in the torque values for the Grade 30 artificial bone (p > 0.05). When the torque values of both anchorage methods were statistically compared with the mean difference for each group, the results of the manual anchorage method were significantly higher than those of the automatic device anchorage method (p < 0.05). A statistically significant difference was observed in the bone stability resulting from different OAS anchorage methods and artificial bone lengths. These findings suggest that the automatic anchorage method should be used when fixing the OAS.

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Insertion torque values and success rates for paramedian insertion of orthodontic mini-implants

Abstract: With an overall success rate of 98.8%, the study hypothesis that greater insertion torque (>10 Ncm) will decrease the success rate and increase palatal OMI failure was rejected.

Cited by 21 publications

References 38 publications

Mechanical Evaluation of the Stability of One or Two Miniscrews under Loading on Synthetic Bone

Mechanical Evaluation of the Stability of One or Two Miniscrews under Loading on Synthetic Bone

Palatal temporary skeletal anchorage devices (TSADs): What to know and how to do?

Influence of Orthodontic Anchor Screw Anchorage Method on the Stability of Artificial Bone: An In Vitro Study

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