The effect of cortical bone thickness on the stability of orthodontic mini-implants and on the stress distribution in surrounding bone

Motoyoshi, Mitsuru; Inaba, Mizuki; Ono, Akiko; Ueno, Shunkichi; Shimizu, Nobutaka

doi:10.1016/j.ijom.2008.09.006

Cited by 183 publications

(166 citation statements)

References 15 publications

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“…Cortical bone thickness varies from 0.5 to 2.5 mm in the vestibular alveolar process 5,12,13,21 , and from 1.0 to 1.5 mm in the palatal alveolar process. 22 Therefore, cortical thicknesses from 1 to 3 mm were selected to test the insertion torque of MI because cortical bone thickness is directly related to insertion torque, and insertion torque influences MI success rates.…”

Section: Discussionmentioning

confidence: 99%

“…5 However, depending on these characteristics, cortical bone thickness and density associated with the size of the selected MI may be sufficient to promote the fracture of MIs during their insertion. 6 The primary stability of an MI is obtained as a result of the mechanical resistance during insertion; 7 therefore, cortical bone thickness and density are important in the initial stages.…”

Section: Declaration Of Interestsmentioning

confidence: 99%

“…Bone quality usually varies according to the site in the arch; however, in the anterior region, bone density is greater than that in the median and posterior regions. 16 The stability of MIs is greater when cortical bone thickness is > 1 mm, 5 but is unaffected by bone density when cortical bone thickness is 1 mm. 14 Many variables can affect the stability of MIs.…”

Section: Declaration Of Interestsmentioning

confidence: 99%

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Influence of cortical thickness on the stability of mini-implants with microthreads

et al. 2015

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The objective of this study was to assess the influence of cortical thickness and bone density on the insertion torque of a mini-implant (MI) with microthreads. Mini-implants with lengths of 6 and 8 mm in the active part were inserted into synthetic bone blocks (polyurethane resin). The density of these blocks was 20 pounds per cubic foot (pcf), simulating bone marrow, and that of blocks 1, 2, and 3-mm-thick blocks was 40 pcf, simulating cortical bone. Blocks with uniform density of 40 pcf were also used to simulate bone areas of greater density. Insertion torque was quantified with a universal testing machine (EMIC). For both MIs, increasing insertion torque was associated with increasing cortical bone thickness. For the same MI length, significant differences were observed among all assessed groups. The insertion torque of the 6-mm-long MI inserted in a 3-mm-thick cortical bone was equivalent to that of the 8-mm-long MI inserted in a 1-mm-thick cortical bone. MIs inserted in bone blocks of greater density presented insertion torque values almost twice as high as those in other groups. The shorter MI, the lower the insertion torque, and the greater the cortical bone thickness, the greater the insertion torque. To minimize fracture risk, the size of MI should be selected according to the insertion site.

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Section: Discussionmentioning

confidence: 99%

Section: Declaration Of Interestsmentioning

confidence: 99%

Section: Declaration Of Interestsmentioning

confidence: 99%

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Influence of cortical thickness on the stability of mini-implants with microthreads

et al. 2015

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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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“…Dessa forma, pode-se observar que os dentes caninos e incisivo lateral superior apresentam, em geral, uma espessura da tábua óssea vestibular mais estreita do que a lingual, corroborando os estudos descritos na literatura. (DEGUCHI et al, 2006;EDEL, 1981;EVANGELISTA et al, 2010;LARATO, 1970;LIM et al, 2009;MOTOYOSHI et al, 2009;MOTOYOSHI et al, 2007;PARK, CHO, 2009;RUPPRECHT et al, 2001;VOLCHANSKY, CLEATON-JONES, 1978;YAGCI et al, 2012) Os caninos movimentados para a região do enxerto apresentaram uma tábua óssea mais estreita do que os caninos e incisivos laterais localizados no quadrante sem fissura, porém com diferença estatisticamente significante apenas para a face …”

Section: A Amostraunclassified

Morfologia do osso periodontal na região de caninos superiores movimentados para a área de fissura alveolar enxertada: avaliação por meio da Tomografia Computadorizada Cone-Beam

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The effect of cortical bone thickness on the stability of orthodontic mini-implants and on the stress distribution in surrounding bone

Cited by 183 publications

References 15 publications

Influence of cortical thickness on the stability of mini-implants with microthreads

Influence of cortical thickness on the stability of mini-implants with microthreads

Is miniscrew primary stability influenced by bone density?

Morfologia do osso periodontal na região de caninos superiores movimentados para a área de fissura alveolar enxertada: avaliação por meio da Tomografia Computadorizada Cone-Beam

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