Evaluation of mechanical strengths of three types of mini‐implants in artificial bones. Issue 2 (10th December 2016)

• Record Type: Journal Article
• Authors: Tseng, Yu‐Chuan; Wu, Ju‐Hui; Ting, Chun‐Chan; Chen, Hong‐Sen; Chen, Chun‐Ming
• Is Part Of: Kaohsiung journal of medical sciences. Volume 33:Issue 2(2017)
• Page Start: 96
• Page End: 101
• Publication Date: 2016-12-10
• Subjects: Anchor area -- Infrazygomatic mini‐implant -- Insertion torque -- Removal torque -- Resonance frequency; Medicine -- Periodicals; 610.5
• DOI: 10.1016/j.kjms.2016.11.001
• Languages: English
• ISSNs: 1607-551X

Abstract

Abstract: We investigates the effect of the anchor area on the mechanical strengths of infrazygomatic mini‐implants. Thirty mini‐implants were divided into three types based on the material and shape: Type A (titanium alloy, 2.0 × 12 mm), Type B (stainless steel, 2.0 × 12 mm), and Type C (titanium alloy, 2.0 × 11 mm). The mini‐implants were inserted at 90° and 45° into the artificial bone to a depth of 7 mm, without predrilling. The mechanical strengths [insertion torque (IT), resonance frequency (RF), and removal torque (RT)] and the anchor area were measured. We hypothesized that no correlation exists among the mechanical forces of each brand. In the 90° tests, the IT, RF, and RT of Type C (8.5 N cm, 10.2 kHz, and 6.1 N cm, respectively) were significantly higher than those of Type A (5.0 N cm, 7.7 kHz, and 4.7 N cm, respectively). In the 45° test, the RFs of Type C (9.2 kHz) was significantly higher than those of Type A (7.0 kHz) and Type B (6.7 kHz). The anchor area of the mini‐implants was in the order of Type C (706 mm 2 ) > Type B (648 mm 2 ) > Type A (621 mm 2 ). Type C exhibited no significant correlation in intragroup comparisons, and the hypothesis was accepted. In the 90° and 45° tests, Type C exhibited the largest anchor area and the highest mechanical strengths (IT, RF, and RT) among the three types of mini‐implants. The anchor area plays a crucial role in the mechanical strength of mini‐implants.