Primary stability of orthodontic mini-implants inserted into maxilla and mandible of swine

Pithon, Matheus Melo; Nojima, Matilde Gonçalves; Nojima, Lincoln Issamu

doi:10.1016/j.tripleo.2011.06.021

Cited by 18 publications

(17 citation statements)

References 19 publications

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“…Similar conclusions regarding cortical bone thickness and implant diameter as important predictors for MIT are found in other studies 8,9,10,12. It has been noted that overall implant shape (conical vs. cylindrical) influences MIT,12 but the unique predictive value of specific geometrical design characteristics has not been analyzed in detail previously.…”

Section: Discussionsupporting

confidence: 74%

“…It has been noted that overall implant shape (conical vs. cylindrical) influences MIT,12 but the unique predictive value of specific geometrical design characteristics has not been analyzed in detail previously.…”

Section: Discussionmentioning

confidence: 99%

“…This method is appropriate for theory testing13 because the experimenter does not determine the entrance order of variables. Predictors are chosen based on previous studies and analysis of intercorrelations and multicollinearity 9,10,12,14,15. Further studies might include bone density, angle of implantation, and changes in implant design when trying to combine the best individual features to maximize implant efficiency.…”

Section: Discussionmentioning

confidence: 99%

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Geometrical design characteristics of orthodontic mini-implants predicting maximum insertion torque

et al. 2014

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ObjectiveTo determine the unique contribution of geometrical design characteristics of orthodontic mini-implants on maximum insertion torque while controlling for the influence of cortical bone thickness.MethodsTotal number of 100 cylindrical orthodontic mini-implants was used. Geometrical design characteristics of ten specimens of ten types of cylindrical self-drilling orthodontic mini-implants (Ortho Easy®, Aarhus, and Dual Top™) with diameters ranging from 1.4 to 2.0 mm and lengths of 6 and 8 mm were measured. Maximum insertion torque was recorded during manual insertion of mini-implants into bone samples. Cortical bone thickness was measured. Retrieved data were analyzed in a multiple regression model.ResultsSignificant predictors for higher maximum insertion torque included larger outer diameter of implant, higher lead angle of thread, and thicker cortical bone, and their unique contribution to maximum insertion torque was 12.3%, 10.7%, and 24.7%, respectively.ConclusionsThe maximum insertion torque values are best controlled by choosing an implant diameter and lead angle according to the assessed thickness of cortical bone.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Geometrical design characteristics of orthodontic mini-implants predicting maximum insertion torque

et al. 2014

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“…Cortical thickness has been related to primary stability of miniscrews and implants. 5,12,28,29,30 However, there is a lack of studies isolating these two factors: bone density and cortical thickness. The second hypothesis is that the difference in bone quality verified statistically may not be clinically relevant.…”

Section: Discussionmentioning

confidence: 99%

Is miniscrew primary stability influenced by bone density?

et al. 2011

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Primary stability is absence of mobility in the bone bed after mini-implant placement and depends on bone quality among other factors. Bone quality is a subjective term frequently considered as bone density. The aim of this preliminary study was to evaluate bone density in two bovine pelvic regions and verify the primary stability of miniscrews inserted into them. Forty bone blocks were extracted from bovine pelvic bones, 20 from iliac and 20 from pubic bone, all of them containing cortical bone about 1 mm thick. Half of the sections extracted from each bone were designated for histological evaluation of bone density (trabecular bone area -TBA) and the other half for bone mineral density (BMD) evaluation by means of central dual-energy X-ray absorptiometry (DEXA). Then, twenty self-drilling miniscrews (INP  , São Paulo, Brazil) 1.4 mm in diameter and 6 mm long were inserted into the bone blocks used for BMD evaluation. Peak implant insertion torque (IT) and pullout strength (PS) were used for primary stability evaluation. It was found that iliac and pubic bones present different bone densities, iliac bone being less dense considering BMD and TBA values (P > 0.05). However, the miniscrew primary stability was not different when varying the bone type (P < 0.05). IT and PS were not influenced by these differences in bone density when cortical thickness was about 1 mm thick.

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“…MIs may also need some degree of osseointegration; therefore, primary healing around the MI‐bone surface should occur avoiding failure during the initial procedure …”

Section: Introductionmentioning

confidence: 99%

RANK/RANKL/OPG gene polymorphisms and loss of orthodontic mini‐implants

Giacobbo

Perin

Pereira

et al. 2020

Orthod Craniofacial Res

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Objective To investigate the association of genetic polymorphisms (tagSNPs type) of RANK/RANKL/OPG genes with the loss of orthodontic mini‐implants (MIs). Setting and sample population One hundred and thirty‐five patients of both sexes, with mean age of 48.7 ± 10 (20‐76 years), were studied. The control group was composed of 104 patients, with no MI lost and functioning for at least 6 months and the case group, of 31 patients with at least one MI lost. Materials and methods Cells were obtained by mouthwash with 3% glucose solution for 1 minute and scraping the buccal mucosa with sterilized spatula. DNA was extracted from buccal epithelial cells with 10 M ammonium acetate and 1 mM EDTA. Genotyping was performed by the real‐time polymerase chain reaction (PCR) technique. Univariate and multivariate analyses were performed (P < .05). Results No markers were associated with MI loss after Benjamini and Hochberg false discovery rate correction of Univariate tests. In the multivariate analysis, the variables that associated with MI loss were the number of MIs installed (P < .000) and the polymorphism rs8086340 in the RANK gene (P = .018). Conclusion A higher number of MIs installed (P < .000) and polymorphism rs8086340 in the RANK gene (P = .018) were associated with loss of orthodontic MIs after multivariate analysis.

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Primary stability of orthodontic mini-implants inserted into maxilla and mandible of swine

Cited by 18 publications

References 19 publications

Geometrical design characteristics of orthodontic mini-implants predicting maximum insertion torque

Geometrical design characteristics of orthodontic mini-implants predicting maximum insertion torque

Is miniscrew primary stability influenced by bone density?

RANK/RANKL/OPG gene polymorphisms and loss of orthodontic mini‐implants

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