Insertion and removal torques according to orthodontic mini-screw design

Yul, Jung; Yoon, Tae Min; Hwang, Chung Ju

doi:10.4041/kjod.2008.38.1.5

Cited by 13 publications

(5 citation statements)

References 16 publications

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“…Despite a high insertion torque, long-term stability has been seen to decline over time, as the excessive stress initially distributed to the surrounding bone is balanced or micro-damage occurs. 19 In this study, screw-root proximity and age were the factors affecting the success rate, whereas sex, jaw, placement side, and placement location did not. In instances in which the miniscrew contacted a root, the success rate was 40.0%.…”

Section: Discussionmentioning

confidence: 52%

Stability and success rate of dual-thread miniscrews:

Lee¹,

Choi²,

Yu³

et al. 2021

The Angle Orthodontist

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Objectives To date, the clinical stability of dual-thread orthodontic miniscrews has not been studied. This study aimed to compare the primary stability and long-term clinical success rate of dual-thread and cylindrical orthodontic miniscrews and to examine the association between various clinical factors and the success rate of miniscrews. Materials and Methods A total of 145 cylindrical and 135 dual-thread miniscrews were inserted in the maxillary and mandibular buccal alveolar areas of 142 patients. The torque and Periotest (Siemens, Bensheim, Germany) values were recorded during insertion and removal. The effect of clinical variables such as sex, age, screw design, jaw, side of placement, root proximity, and site of placement on the success rate was examined using logistic regression analysis. Results There was no statistically significant difference (P = .595) in the overall clinical success rate between the two designs, with an overall success rate of 82.1% and 84.4% for the cylindrical and dual-thread miniscrews, respectively. Age and screw-root proximity were significantly associated with failure (P < .05). Conclusions The dual-thread miniscrews did not show superior long-term stability and clinical success rate as compared with the cylindrical miniscrews. The results of this study suggest that patient age and screw-root proximity influence the clinical success rate of miniscrews.

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Section: Discussionmentioning

confidence: 52%

Stability and success rate of dual-thread miniscrews:

Lee¹,

Choi²,

Yu³

et al. 2021

The Angle Orthodontist

Self Cite

View full text Add to dashboard Cite

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“…To improve success rate of 1.6 mm-diameter mini-implants, they recommended the placement torque to be from 5 to 10 NCm [ 23 ]. Self-drilling system and tapered mini-implants may increase primary stability, but harmful stress can be generated if the torque is excessive [ 24 , 25 ].…”

Section: Discussionmentioning

confidence: 99%

Primary Stability of Self-Drilling and Self-Tapping Mini-Implant in Tibia of Diabetes-Induced Rabbits

Park

Kim

Paek

et al. 2014

International Journal of Dentistry

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Objective. This study aimed to evaluate effects of type 1 diabetes mellitus and mini-implant placement method on the primary stability of mini-implants by comparing mechanical stability and microstructural/histological differences. Methods. After 4 weeks of diabetic induction, 48 mini-implants (24 self-tapping and 24 self-drilling implants) were placed on the tibia of 6 diabetic and 6 normal rabbits. After 4 weeks, the rabbits were sacrificed. Insertion torque, removal torque, insertion energy, and removal energy were measured with a surgical engine on 8 rabbits. Remaining 4 rabbits were analyzed by microcomputed tomography (micro-CT) and bone histomorphometry. Results. Total insertion energy was higher in self-drilling groups than self-tapping groups in both control and diabetic groups. Diabetic groups had more trabecular separation in bone marrow than the control groups in both SD and ST groups. Micro-CT analysis showed deterioration of bone quality in tibia especially in bone marrow of diabetic rabbits. However, there was no statistically significant correlation between self-drilling and self-tapping group for the remaining measurements in both control and diabetic groups. Conclusions. Type 1 diabetes mellitus and placement method of mini-implant did not affect primary stability of mini-implants.

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“…Insertion torque analysis was used to measure the mechanical retention achieved by screwing[ 11 14 ] and removal torque analysis is a method used to assess the stability and the osseointegration capacity of MSIs. [ 20 21 ] We did not want to experience any unwanted increases or decreases in terms of MIT, MRT or mobility. We found a significant ( P < 0.01) difference in terms of MIT between the control and MIR groups (this difference was within the desired limits) and we observed an improvement in terms of MRT and mobility, but the difference was not statistically significant.…”

Section: Discussionmentioning

confidence: 99%

Effects of a newly designed apparatus on orthodontic skeletal anchorage

2013

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Objective:An appliance was designed to increase the cortical bone surface contact area of miniscrew implants (MSIs). The purpose of this in vitro study was to evaluate the effects of this appliance on the anchorage force resistance and the stability of orthodontic MSIs.Materials and Methods:A total of 48 MSIs were placed into bone specimens prepared from the ilium of bovines. Half were placed with the newly designed apparatus and half were placed conventionally. All the specimens were subjected to tangential force loading perpendicular to the MSI with lateral displacement of 0.6 mm, using an Instron Universal Testing machine. The maximum removal torque of each tested specimen was also recorded. Both study and control groups were divided into two subgroups based on whether they had thin and thick cortical bone.Results:The test group had statistically higher force anchorage resistance and maximum insertion torque values than the control group (P < 0.001). The results were found to be more significant in cases in which the cortical bone was thin (P < 0.001).Conclusions:Within the limits of this in vitro study, the present findings suggest that the newly designed apparatus might have a favorable effect on MSI stability in patients presenting with thin cortical bone. Clinical studies are necessary to confirm the results that were observed in vitro.

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Insertion and removal torques according to orthodontic mini-screw design

Cited by 13 publications

References 16 publications

Stability and success rate of dual-thread miniscrews:

Stability and success rate of dual-thread miniscrews:

Primary Stability of Self-Drilling and Self-Tapping Mini-Implant in Tibia of Diabetes-Induced Rabbits

Effects of a newly designed apparatus on orthodontic skeletal anchorage

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