Influence of geometric design characteristics on primary stability of orthodontic miniscrews

Radwan, Eman Saad; Montasser, Mona A.; Maher, A.

doi:10.1007/s00056-018-0131-7

Cited by 26 publications

(21 citation statements)

References 23 publications

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“…A strength point that could be added to the design of future studies would be testing miniscrews of the different materials manufactured with the same geometric design. Geometric design had been found to affect the mechanical properties of orthodontic miniscrews [ 43 , 44 ].…”

Section: Discussionmentioning

confidence: 99%

Reliability of Orthodontic Miniscrews: Bending and Maximum Load of Different Ti-6Al-4V Titanium and Stainless Steel Temporary Anchorage Devices (TADs)

et al. 2018

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Temporary anchorage devices (TADs) have been introduced into orthodontic clinical practice in order to allow tooth movements while avoiding strain on adjacent teeth. Miniscrews are available in the market with different diameters and materials. Accordingly, the purpose of the present report was to measure and compare the forces to bend and fracture different mini implants. Ti-6Al-4V titanium and stainless steel TADs of different manufacturers (Spider ScrewHDC; Mini Implants–Leone; Benefit–Orteam; Storm–Kristal) were evaluated. Two different diameters (1.5 mm and 2.0 mm) were tested. The sample included 10 unused specimens for each group, blocked in an Instron Universal Testing Machine, and a shear load was applied at the neck of the miniscrew. The force to bend the miniscrew was measured at 0.1 mm and 0.2 mm deflections. Also, the maximum force before screw fracture was recorded. Data were submitted for statistical analysis. Results showed significantly higher forces for 2.0 mm than 1.5 mm screws, both at 0.1 mm and 0.2 mm deflections and at maximum load. Moreover, no significant differences were reported between titanium and stainless steel miniscrews of equal diameters.

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Section: Discussionmentioning

confidence: 99%

Reliability of Orthodontic Miniscrews: Bending and Maximum Load of Different Ti-6Al-4V Titanium and Stainless Steel Temporary Anchorage Devices (TADs)

et al. 2018

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“…Linear measurements included: flank, pitch depth, and pitch width. Definitions and details of the measurements have been given in previous publications [ 19 , 25 ].…”

Section: Methodsmentioning

confidence: 99%

“…Previous studies measured the dimensions of different components of orthodontic appliances including brackets [ 15 ], archwires [ 16 ], and miniscrews [ 17 , 18 , 19 ]. The purpose of these studies was to evaluate the accuracy of the measured dimensions in comparison to the dimensions given by the manufactures or to detect the correlation between dimensions and the mechanical performance of the studied orthodontic components.…”

Section: Introductionmentioning

confidence: 99%

Imaging Software Programs for Reliable Mathematical Measurements in Orthodontics

et al. 2020

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Aim: To evaluate the reliability of linear and angular measurements taken using different software programs in orthodontics. Materials and Methods: A sample of four software programs from different manufacturers, namely MicroDicom viewer, Photoshop® CS3, AutoCAD®, and Image-Pro®, were used for measuring the geometric features of four types of miniscrews from different manufacturers. Each miniscrew type presented a group: Group I, Tomas® (Dentaurum, Ispringen, Germany); Group II, HUBIT® (HUBIT, Gyeonggi-do, Korea); Group III, AbsoAnchor® (Dentos, Daegu, Korea); and Group IV, Creative (Creative, Zhejiang, China). Measurements of apical face angle, thread angle, lead angle, flank, pitch depth, and width were taken on 45 × magnification scanning electron microscope images of the shafts of the miniscrews. One assessor measured the seven geometric features for the four types of miniscrews using the four software programs twice in two sessions separated by a three week interval. Results: Pairwise comparisons, for each of the four miniscrew groups, showed that the only common result observed was the significant difference (p < 0.001) between measurements of flank taken by the four software programs. When measurements of the four types of miniscrews were pooled into one group, a high degree of intra-rater reliability (ICC range from 0.9 to 1.0) for all the seven geometric features was found with all the four software programs. The paired t-test showed insignificant difference (at p ≤ 0.05) between the first and second measurements, except for a few measurements including pitch width measured by Image-Pro® (p = 0.012), MicroDicom (p = 0.023), and Photoshop® (p = 0.001). Conclusions: Results did not give absolute superiority to one software program over the others and suggested an assessor effect. Assessor estimates could have been affected, among other factors, by the design of the miniscrews and the technical features of the software programs.

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“…Studies related to orthodontic miniscrews have mostly explored the effect of different miniscrew brands or exterior designs on orthodontic miniscrew stability 30 – 34 ; whether bone quality or quantity influence stability is less discussed 29 . Furthermore, no study has examined the correlations between the three factors that affect orthodontic miniscrew stability, namely bone quality and quantity, BMC%, and the ITV.…”

Section: Introductionmentioning

confidence: 99%

Bone quality affects stability of orthodontic miniscrews

Tsai

et al. 2022

Sci Rep

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The objective of this study was to evaluate the effect of bone–miniscrew contact percentage (BMC%) and bone quality and quantity on orthodontic miniscrew stability and the maximum insertion torque value (ITV). Orthodontic miniscrews of five different dimensions and several bovine iliac bone specimens were used in the evaluation. Miniscrews of each dimension group were inserted into 20 positions in bovine iliac bone specimens. The experiment was divided into three parts: (1) Bone quality and quantity were evaluated using cone-beam computed tomography (CBCT) and microcomputed tomography. (2) The 3D BMC% was calculated. (3) The ITVs during miniscrew insertion were recorded to evaluate the stability of the orthodontic miniscrews. The results indicated that longer and thicker miniscrews enabled higher ITVs. CBCT was used to accurately measure cortical bone thickness (r = 0.939, P < 0.05) and to predict the bone volume fraction of cancellous bone (r = 0.752, P < 0.05). BMC% was significantly influenced by miniscrew length. The contribution of cortical bone thickness to the ITV is greater than that of cancellous bone structure, and the contribution of cortical bone thickness to BMC% is greater than that of cancellous bone structure. Finally, the higher is BMC%, the greater is the ITV. This study concludes that use of CBCT may predict the mechanical stability of orthodontic miniscrews.

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Influence of geometric design characteristics on primary stability of orthodontic miniscrews

Cited by 26 publications

References 23 publications

Reliability of Orthodontic Miniscrews: Bending and Maximum Load of Different Ti-6Al-4V Titanium and Stainless Steel Temporary Anchorage Devices (TADs)

Reliability of Orthodontic Miniscrews: Bending and Maximum Load of Different Ti-6Al-4V Titanium and Stainless Steel Temporary Anchorage Devices (TADs)

Imaging Software Programs for Reliable Mathematical Measurements in Orthodontics

Bone quality affects stability of orthodontic miniscrews

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