Evaluation of orthodontic mini-implant anchorage in premolar extraction therapy in adolescents

Garfinkle, Judah S.; Cunningham, Larry L.; Beeman, Cynthia S.; Kluemper, G. Thomas; Hicks, E. Preston; Kim, Miok

doi:10.1016/j.ajodo.2006.04.053

Cited by 89 publications

(48 citation statements)

References 26 publications

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“…10 It has been suggested that if initial mechanical retention of the mini-implant is not observed, it should be replaced by a thicker device, or its insertion site should be changed. 11 Primary stability has traditionally been assessed by the practitioner through manual verification. 12 Several other less subjecDeclaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%

Is miniscrew primary stability influenced by bone density?

et al. 2011

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“…The steady mini-implant can bear at most 300 g orthodontic single force, and the force value which is loaded instantly should not exceed 200 g [8,9]. As for the torque control of the posterior teeth, Chan and Hohmann thought the torque more than 6Nmm would cause root resorption [10,11].…”

Section: Discussionmentioning

confidence: 99%

Analysis on the stress of the bone surrounding mini-implant with different diameters and lengths under torque

Lü

Chang

et al. 2015

BME

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Abstract. The purpose of this study is to compare the stress of the bone around the mini-implant under the two kinds of force: the composite force which contains torque and traditional single force. There were 96 finite element models formed by the combination of mini-implant and bone, with diameters of 1.2 mm, 1.6 mm, 2.0 mm and corresponding length being 6 mm, 8 mm, 10 mm, 12 mm, respectively. Each size corresponded to 8 models. Group SF (each size n=4) was loaded with 200 g single force, while Group CF (each size n=4) was loaded with composite force which contained 6N mm torque and 200 g single force. The maximum equivalent stress (Max EQS) of the bone surrounding mini implant with different loading directions was calculated, and the relationship of force direction, diameter and length was also evaluated. The Max EQS of Group CF was higher than that of Group SF. The effect of force direction on the stress was related to the diameter of mini implant, but had nothing to do with its length. The Max EQS of the cortical bone around mini implant in Group CF was higher (P<0.05) than that in Group SF. In contrast, there was no significant difference (P>0.05) between Group SF and Group CF in terms of bone stress when the diameter of mini implant was 1.6 mm or 2.0 mm. In our study, it is demonstrated that the diameter of mini-implant is better to be larger than 1.2 mm when a mini-implant is used in a torque control of tooth. The impact of this feature in the clinical setting needs to be verified.

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“…The success rate for immediate loading of miniimplants in adolescent patients was 60-80% in one study (10). The stability of mini-implants is related to clinical factors such as oral hygiene (11), the degree of inflammation accompanying local irritation, excessive orthodontic force (7), the design and shape of the screw thread (12), and the proximity of the mini-implant to the roots of adjacent teeth (13).…”

Section: Introductionmentioning

confidence: 99%

A healing period increases mini-implant stability in growing rats

et al. 2014

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Abstract:We assessed the stability of orthodontic mini-implants in young rats. Male rats with mean ages of 6 weeks (n = 16) and 20 weeks (n = 16) were divided into four groups (n = 8 each). In the 6-and 20-week immediate-loading groups, immediately after placement, mini-implants were exposed to an experimental traction force for 2 weeks. In the 6-and 20-week healing groups, the force was applied for 2 weeks after a 6-week healing period. Right tibiae served as the test limbs and the left tibiae as controls. A Periotest device was used to measure mini-implant mobility after traction, and Tukey's test was used to compare Periotest values among groups. The results showed significantly greater mobility in the 6-week immediate-loading group than in the 20-week immediate-loading and 6-and 20-week healing groups, and significantly less mobility in the 6-week healing group than in the 20-week immediate-loading group (P < 0.05). Mini-implants were stable during the healing period. The results indicate that mini-implants can be used for orthodontic anchorage in juvenile patients if the duration of healing is sufficient. (J Oral Sci 56, 113-118, 2014)

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Evaluation of orthodontic mini-implant anchorage in premolar extraction therapy in adolescents

Cited by 89 publications

References 26 publications

Is miniscrew primary stability influenced by bone density?

Is miniscrew primary stability influenced by bone density?

Analysis on the stress of the bone surrounding mini-implant with different diameters and lengths under torque

A healing period increases mini-implant stability in growing rats

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