Mechanical strength of stainless steel and titanium alloy mini-implants with different diameters : an experimental laboratory study
dc.contributor.author | Barros, Sérgio Estelita Cavalcante | pt_BR |
dc.contributor.author | Vanz, Viviane | pt_BR |
dc.contributor.author | Chiqueto, Kelly Fernanda Galvão | pt_BR |
dc.contributor.author | Janson, Guilherme | pt_BR |
dc.contributor.author | Ferreira, Eduardo Silveira | pt_BR |
dc.date.accessioned | 2023-03-30T03:23:12Z | pt_BR |
dc.date.issued | 2021 | pt_BR |
dc.identifier.issn | 2196-1042 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/256479 | pt_BR |
dc.description.abstract | Background: The mechanical strength of mini-implants is a critical factor due to their small diameters. Currently, it is not possible to state whether there is a relevant difference between the mechanical properties of stainless steel (SS-MIs) and titanium alloy mini-implants (TA-MIs). The objective of this study was to test the null hypothesis that there is no difference in the mechanical strength of SS-MIs and TA-MIs, and to analyze, by scanning electron microscopy (SEM), the SS-MI, and TA-MI threads resistance to morphological damage after insertion. Methods: A standardized sample of 504 SS-MIs and TA-MIs with diameters ranging from 1.2 mm to 1.8 mm was used. Torsional fracture was performed in 154 MIs. Flexural strength of 280 MIs was evaluated at 1 mm and 2 mmdeflection. The threads of 70 MIs were morphologically analyzed by scanning electron microscopy (SEM), before and after their insertion in high-density artificial bone blocks. Comparisons between SS-MIs and TA-MIs were performed with t tests or Mann-Whitney U tests. A multiple linear regression analysis was used to evaluate the influence of variables on the ranging of MI mechanical strength. Results: SS-MIs had higher fracture torque. The mean difference between the SS-MIs and TA-MIs fracture torque was of 4.09 Ncm. The MI diameter explained 90.3% of the total variation in fracture torque, while only 2.2% was explained by the metallic alloy. The SS-MI group presented a higher deformation force during the 1mm and 2mmdeflection. The mean difference between the flexural strength of SS and TA-MIs at 1 mm and 2 mm-deflection was of 18.21 N and 17.55 N, respectively. There was no noticeable morphological damage to the threads of SS-MIs and TA-MIs. Conclusions: The null hypothesis was rejected. SS-MIs were 13.2% and 20.2% more resistant to torsional fracture and deflection, respectively. The threads of the SS-MIs and TA-MIs were not damaged during the insertion and removal process. Thus, the use of SS-MI can reduce the fracture risk without increasing the MI diameter. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Progress in Orthodontics. Copenhagen. Vol. 22, no. 1 (2021), 9 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Mini-implant | en |
dc.subject | Procedimentos de ancoragem ortodôntica | pt_BR |
dc.subject | Orthodontic anchorage | en |
dc.subject | Aço inoxidável | pt_BR |
dc.subject | Flexural strength | en |
dc.subject | Torsional strength | en |
dc.subject | Stainless Steel | en |
dc.subject | Titanium alloy | en |
dc.title | Mechanical strength of stainless steel and titanium alloy mini-implants with different diameters : an experimental laboratory study | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001163723 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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