Effect of Anchor Length on the Pullout Strength of Palatal Mini Implants

Yu Chuan Tseng, Chun Chan Ting, Ju Hui Wu, Hong Sen Chen, Chun Ming Chen

Research output: Contribution to journalArticle


Purpose: The aim of this study was to evaluate the pullout strength of 3 different orthodontic mini implants. Materials and Methods: Twenty-seven mini implants (diameter: 2 mm, length: 7 mm) were implanted into artificial bone (Sawbones; Pacific Research Laboratories Inc.) at depths of 3, 4, and 5 mm. The insertion torque (IT), resonance frequency (RF), pullout strength (PS), and anchor length (AL) were measured. One-way analysis of variance with Tukey honest significant difference (HSD) postcomparison were used to detect intergroup differences. The null hypothesis was that IT, RF, and PS would significantly correlate in the same brand. Results: In the implantation depths (ID) (5 and 4 mm), IT of Types C (16.67 and 14.33 N·cm) and Type B (14 and 13.33 N·cm) were significantly higher than Type A (10.33 and 9.33 N·cm). Type A had a largest AL and PS at the IDs (5 and 4 mm). In the IDs (3 mm), PS was no different. Type C had no correlation among the RF, IT, and PS. Therefore, null hypothesis was rejected. Conclusion: AL exerted crucial effects on the PS of the mini implants.

Original languageEnglish
Pages (from-to)553-558
Number of pages6
JournalImplant Dentistry
Issue number4
Publication statusPublished - 2017 Aug 1

All Science Journal Classification (ASJC) codes

  • Oral Surgery

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