Insertion and removal torques according to orthodontic mini-screw design

Jung Yul Cha, Tae Min Yoon, Chung Ju Hwang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Objective: This study was designed to analyze the primary and secondary stability characteristics of orthodontic mini-screws of tapered design when compared with the cylinder mini-screw. Methods: A total of 48 mini-screws were placed into the buccal alveolar bone of the mandible in 6 male beagle dogs. Comparison was made between tapered and cylinder type mini-screws (Biomaterials Korea, Seoul, Korea). Maximum insertion torque (MIT) was measured using a torque sensor (Mark-10, MGT 50, USA) during installation, and maximum removal torque (MRT) was recorded after 3 and 12 weeks of loading. Results: Taper mini-screws showed a higher MIT value of 22.3 Ncm compared with cylinder mini-screw showing 13.6 Ncm (p < 0.001). The MRT of the taper mini-screw showed a significantly higher value of 9.1 Ncm than those of cylinder mini-screw of 5.7 Ncm at 3-weeks after installation (p < 0.05). However, there was no difference in the MRT value between the taper and cylinder mini-screws at 12 weeks of loading. Conclusions: These results showed that the high insertion torque of the taper mini-screw design increases initial stability until 3 weeks of loading, but does not have any effect on the secondary stability at 12 weeks of loading.

Original languageEnglish
Pages (from-to)5-12
Number of pages8
JournalKorean Journal of Orthodontics
Volume38
Issue number1
DOIs
Publication statusPublished - 2008 Feb 1

Fingerprint

Torque
Orthodontics
Korea
Zygoma
Biocompatible Materials
Mandible
Dogs

All Science Journal Classification (ASJC) codes

  • Orthodontics

Cite this

@article{bff4185200a84a769483584f37573bc6,
title = "Insertion and removal torques according to orthodontic mini-screw design",
abstract = "Objective: This study was designed to analyze the primary and secondary stability characteristics of orthodontic mini-screws of tapered design when compared with the cylinder mini-screw. Methods: A total of 48 mini-screws were placed into the buccal alveolar bone of the mandible in 6 male beagle dogs. Comparison was made between tapered and cylinder type mini-screws (Biomaterials Korea, Seoul, Korea). Maximum insertion torque (MIT) was measured using a torque sensor (Mark-10, MGT 50, USA) during installation, and maximum removal torque (MRT) was recorded after 3 and 12 weeks of loading. Results: Taper mini-screws showed a higher MIT value of 22.3 Ncm compared with cylinder mini-screw showing 13.6 Ncm (p < 0.001). The MRT of the taper mini-screw showed a significantly higher value of 9.1 Ncm than those of cylinder mini-screw of 5.7 Ncm at 3-weeks after installation (p < 0.05). However, there was no difference in the MRT value between the taper and cylinder mini-screws at 12 weeks of loading. Conclusions: These results showed that the high insertion torque of the taper mini-screw design increases initial stability until 3 weeks of loading, but does not have any effect on the secondary stability at 12 weeks of loading.",
author = "Cha, {Jung Yul} and Yoon, {Tae Min} and Hwang, {Chung Ju}",
year = "2008",
month = "2",
day = "1",
doi = "10.4041/kjod.2008.38.1.5",
language = "English",
volume = "38",
pages = "5--12",
journal = "Korean Journal of Orthodontics",
issn = "2234-7518",
publisher = "Korean Association of Orthodontists",
number = "1",

}

Insertion and removal torques according to orthodontic mini-screw design. / Cha, Jung Yul; Yoon, Tae Min; Hwang, Chung Ju.

In: Korean Journal of Orthodontics, Vol. 38, No. 1, 01.02.2008, p. 5-12.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Insertion and removal torques according to orthodontic mini-screw design

AU - Cha, Jung Yul

AU - Yoon, Tae Min

AU - Hwang, Chung Ju

PY - 2008/2/1

Y1 - 2008/2/1

N2 - Objective: This study was designed to analyze the primary and secondary stability characteristics of orthodontic mini-screws of tapered design when compared with the cylinder mini-screw. Methods: A total of 48 mini-screws were placed into the buccal alveolar bone of the mandible in 6 male beagle dogs. Comparison was made between tapered and cylinder type mini-screws (Biomaterials Korea, Seoul, Korea). Maximum insertion torque (MIT) was measured using a torque sensor (Mark-10, MGT 50, USA) during installation, and maximum removal torque (MRT) was recorded after 3 and 12 weeks of loading. Results: Taper mini-screws showed a higher MIT value of 22.3 Ncm compared with cylinder mini-screw showing 13.6 Ncm (p < 0.001). The MRT of the taper mini-screw showed a significantly higher value of 9.1 Ncm than those of cylinder mini-screw of 5.7 Ncm at 3-weeks after installation (p < 0.05). However, there was no difference in the MRT value between the taper and cylinder mini-screws at 12 weeks of loading. Conclusions: These results showed that the high insertion torque of the taper mini-screw design increases initial stability until 3 weeks of loading, but does not have any effect on the secondary stability at 12 weeks of loading.

AB - Objective: This study was designed to analyze the primary and secondary stability characteristics of orthodontic mini-screws of tapered design when compared with the cylinder mini-screw. Methods: A total of 48 mini-screws were placed into the buccal alveolar bone of the mandible in 6 male beagle dogs. Comparison was made between tapered and cylinder type mini-screws (Biomaterials Korea, Seoul, Korea). Maximum insertion torque (MIT) was measured using a torque sensor (Mark-10, MGT 50, USA) during installation, and maximum removal torque (MRT) was recorded after 3 and 12 weeks of loading. Results: Taper mini-screws showed a higher MIT value of 22.3 Ncm compared with cylinder mini-screw showing 13.6 Ncm (p < 0.001). The MRT of the taper mini-screw showed a significantly higher value of 9.1 Ncm than those of cylinder mini-screw of 5.7 Ncm at 3-weeks after installation (p < 0.05). However, there was no difference in the MRT value between the taper and cylinder mini-screws at 12 weeks of loading. Conclusions: These results showed that the high insertion torque of the taper mini-screw design increases initial stability until 3 weeks of loading, but does not have any effect on the secondary stability at 12 weeks of loading.

UR - http://www.scopus.com/inward/record.url?scp=77950318077&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77950318077&partnerID=8YFLogxK

U2 - 10.4041/kjod.2008.38.1.5

DO - 10.4041/kjod.2008.38.1.5

M3 - Article

AN - SCOPUS:77950318077

VL - 38

SP - 5

EP - 12

JO - Korean Journal of Orthodontics

JF - Korean Journal of Orthodontics

SN - 2234-7518

IS - 1

ER -