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Strain of bone-implant interface and insertion torque regarding different miniscrew thread designs using an artificial bone model

 Jung-Yul Cha  ;  Chung-Ju Hwang  ;  Sung Hwang Kwon  ;  Han-Sung Jung  ;  Kwang-Mahn Kim  ;  Hyung Seog Yu 
 EUROPEAN JOURNAL OF ORTHODONTICS, Vol.37(3) : 268-274, 2015 
Journal Title
Issue Date
Biomechanical Phenomena ; Bone Screws* ; Bone Substitutes/chemistry ; Bone and Bones/anatomy & histology ; Bone-Implant Interface/physiology* ; Dental Alloys/chemistry ; Elastic Modulus ; Humans ; Miniaturization ; Orthodontic Anchorage Procedures/instrumentation* ; Orthodontic Appliance Design* ; Polyurethanes/chemistry ; Stress, Mechanical ; Surface Properties ; Titanium/chemistry ; Torque
OBJECTIVES: To evaluate the initial stability of dual-thread miniscrews by analyzing the strain at the bone-implant interface and insertion torque during implantation in artificial bone models with different cortical bone thicknesses. MATERIALS AND METHODS: Insertion torque, and strain, measured with a five-element strain gauge in 1.0, 1.5, and 2.0-mm artificial cortical bone, during insertion of single- (OAS-T1507) and dual-thread (MPlant-U3) type self-drilling miniscrews were assessed. RESULTS: Both dual- and single-thread miniscrews showed greater than 7790 μstrain for all cortical bone thicknesses, and dual-thread miniscrews reached up to 19580 μstrain in 2.00 m m cortical bone. The strain of dual-thread miniscrews increased with increasing cortical bone thicknesses of 1.0-2.0mm. For single-thread miniscrews, the maximum insertion torque was relatively constant, but maximum insertion torque increased significantly in dual-thread groups with increasing cortical bone thicknesses (P < 0.0001). The maximum insertion torque with all cortical bone thicknesses was significantly lower with single- than dual-thread types (P < 0.0001). CONCLUSIONS: Self-drilling dual-thread miniscrews provide better initial mechanical stability, but may cause strain over the physiological bone remodelling limit at the bone-implant interface in thick cortical bone layers.
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2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Oral Biology (구강생물학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kwang Mahn(김광만) ORCID logo https://orcid.org/0000-0002-5235-0294
Yu, Hyung Seog(유형석) ORCID logo https://orcid.org/0000-0002-1275-5078
Jung, Han Sung(정한성) ORCID logo https://orcid.org/0000-0003-2795-531X
Cha, Jung Yul(차정열)
Hwang, Chung Ju(황충주) ORCID logo https://orcid.org/0000-0003-3024-4551
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