A comparison of tapered and cylindrical miniscrew stability

Seong Hun Yoo, Young Chel Park, Chung Ju Hwang, Ji Young Kim, Eun Hee Choi, Jung Yul Cha

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


OBJECTIVES: This study compared the stability of tapered miniscrews with cylindrical miniscrews. MATERIALS/METHODS: One hundred and five tapered and 122 cylindrical self-drilling miniscrews were placed into the maxillary and mandibular buccal alveolar areas of 132 patients (43 males and 89 females). The insertion torque and removal torque were measured and Periotest values (PTVs) were recorded at implantation. RESULTS: The success rates of the tapered and cylindrical miniscrews examined were similar. In the maxilla, the insertion torque of the tapered miniscrews (8.3 Ncm) was significantly higher than that of the cylindrical miniscrews (6.3 Ncm) (P < 0.05). The PTVs of the tapered miniscrews were statistically significantly lower in the maxilla (P < 0.05). The removal torque values showed no significant difference between the tapered and cylindrical miniscrews in the upper and lower buccal areas (P > 0.05). CONCLUSIONS: Tapered miniscrews had higher initial stability when compared to cylindrical miniscrews, whereas the clinical success rates and removal torques were similar between the two designs. The long-term stability is not directly affected by the miniscrew design.

Original languageEnglish
Pages (from-to)557-562
Number of pages6
JournalEuropean Journal of Orthodontics
Issue number5
Publication statusPublished - 2014 Oct 1

Bibliographical note

Publisher Copyright:
© 2013 The Author. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Orthodontics


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