Insertion torque, pull-out strength and cortical bone thickness in contact with orthodontic mini-implants at different insertion angles

Meira, Thiago Martins; Tanaka, Orlando Motohiro; Ronsani, Maiara Medeiros; Maruo, Ivan Toshio; Filho, Odilon Guariza; Camargo, Elisa Souza; Mikami, Hiroshi

doi:10.1093/ejo/cjs095

Cited by 21 publications

(13 citation statements)

References 17 publications

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“…An in vitro study, which did not take into consideration different cortical bone thickness, reported that angled insertion provides greater MIT as a consequence of increased contact in the mini-implant-cortical bone interface 37 . The results of this present study suggest that the characteristics of the alveolar cortical bone should be taken into consideration when determining a suitable placement angle for mini-implant insertion.…”

Section: Discussionmentioning

confidence: 69%

Effect of vertical placement angle on the insertion torque of mini-implants in human alveolar bone

Maya

Pinzan-Vercelino

Gurgel

2016

Dental Press J. Orthod.

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Objective: The aim of the present ex-vivo study was to evaluate the effect of the vertical placement angle of mini-implants on primary stability by analyzing maximum insertion torque (MIT). Methods: Mini-implants were placed in 30 human cadavers, inserted at either a 90° or 60° angle to the buccal surface of the maxillary first molar. Out of 60 self-drilling mini-implants used, half were of the cylindrical type and half were of the conical type. Primary stability was assessed by means of measuring the MIT. Data were subjected to analysis of variance (ANOVA) and Newman-Keuls tests. A significance level of 5% was adopted. Results: The MIT was higher for both mini-implant types when they were placed at a 90° angle (17.27 and 14.40 Ncm) compared with those placed at a 60° angle (14.13 and 11.40 Ncm). Conclusions: MIT values were differed according to the vertical mini-implant placement angle in the maxillary posterior area. Regardless of the type of mini-implant used, placement at a 90° angle resulted in a higher MIT.

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Section: Discussionmentioning

confidence: 69%

Effect of vertical placement angle on the insertion torque of mini-implants in human alveolar bone

Maya

Pinzan-Vercelino

Gurgel

2016

Dental Press J. Orthod.

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“…Studies investigating the stability of mini‐implants have focused on measures of mechanical strength, including insertion torque (IT) [1,2], removal torque (RT) [3], and pullout strength [4–6]. The procedures used to analyze these measures are nonrepeated, invasive, and destructive.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of mechanical strengths of three types of mini‐implants in artificial bones

Tseng

Ting

et al. 2016

The Kaohsiung J of Med Scie

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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)>Type B (648 mm)>Type A (621 mm). 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.

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“…To date, studies have examined mini‐implant stability, including the insertion torque (IT) [4,5], removal torque [6,7], and vertical and horizontal pullout strength (HPS) [8–10]. Because of immediate loading, the stability of a mini‐implant relies on the mechanical interlocking between the mini‐implant thread and the surrounding bones.…”

Section: Introductionmentioning

confidence: 99%

Effects of gripping volume in the mechanical strengths of orthodontic mini‐implant

Tseng

Chen

et al. 2017

The Kaohsiung J of Med Scie

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The objective of study was to investigate the correlation between the mechanical strengths [insertion torque (IT); resonance frequency (RF); and horizontal pullout strength (HPS)] and gripping volume (GV) of mini-implants. Thirty mini-implants of three types (Type A: 2 mm × 10 mm, cylindrical, titanium alloy; Type B: 2 mm × 10 mm, tapered, stainless steel; and Type C: 2 mm × 11 mm, cylindrical, titanium alloy) were inserted 7 mm into artificial bones. One-way analysis of variance and Spearman's test were applied to assess intergroup comparisons and intragroup correlations. The null hypothesis was that no statistically significant correlations exist between the GV and mechanical strengths (IT, RF, and HPS). In the IT test, Type C (14.2 Ncm) had significantly (p=0.016) greater values than did Type A (12.4 Ncm). In the RF analysis, no significant difference was observed among the three types of mini-implants. In the HPS test, Type C (388.9 Ncm) was significantly larger than both Type B (294.5 Ncm) and Type A (286 Ncm). In the GV measurement, Type C (14.4 mm) was significantly larger than Type B (11.4 mm) and Type A (9.2 mm). Type A and Type B exhibited no significant correlations among the tests. Therefore, the null hypothesis was accepted. Although no significant correlation was noted between the GV and mechanical strengths (IT, RF, and HPS), we observed a trend that the mechanical strengths (IT, RF, and HPS) of the mini-implants corresponded to the order and values of GV (Type C > Type B > Type A).

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Insertion torque, pull-out strength and cortical bone thickness in contact with orthodontic mini-implants at different insertion angles

Cited by 21 publications

References 17 publications

Effect of vertical placement angle on the insertion torque of mini-implants in human alveolar bone

Effect of vertical placement angle on the insertion torque of mini-implants in human alveolar bone

Evaluation of mechanical strengths of three types of mini‐implants in artificial bones

Effects of gripping volume in the mechanical strengths of orthodontic mini‐implant

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