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

Research output: Contribution to journalArticle

9 Citations (Scopus)


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 19 580 μstrain in 2.00 mm cortical bone. The strain of dual-thread miniscrews increased with increasing cortical bone thicknesses of 1.0-2.0 mm. 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.

Original languageEnglish
Pages (from-to)268-274
Number of pages7
JournalEuropean Journal of Orthodontics
Issue number3
Publication statusPublished - 2015 Jun 1


All Science Journal Classification (ASJC) codes

  • Orthodontics

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