Comparison of cortical bone thickness and root proximity at maxillary and mandibular interradicular sites for orthodontic mini‐implant placement

Lim, Jaeheung; Lee, S J; Kim, Y J; Lim, Won Hee; Chun, Yang Sook

doi:10.1111/j.1601-6343.2009.01465.x

Cited by 44 publications

(45 citation statements)

References 13 publications

(17 reference statements)

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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%

“…1,4,8,9,10,11 Some studies have assessed cortical bone thickness and bone density because they are important for the stability of MI. 12,13,14 Using microcomputed tomography, Laursen et al 15 found that the thickness of the alveolar cortical bone was often < 1.0 mm buccally and palatally in the maxilla and buccally in the anterior mandible. However, in the posterior mandible, the alveolar cortical bone was thicker than 2.0 mm.…”

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%

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

et al. 2015

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“…[1][2][3] The most used and easily accessible insertion sites are the buccal aspect of the alveolar process in both the maxilla and mandible as well as the palatal side of the maxillary alveolar process in the premolar and molar region. 4 The thickness of human cortical bone in these areas has been assessed by conventional computed tomography (CT) [5][6][7][8] and cone-beam computed tomography (CBCT). [9][10][11][12][13] More detailed information can be achieved using micro-computed tomography (micro-CT).…”

Section: Introductionmentioning

confidence: 99%

An evaluation of insertion sites for mini-implants

Laursen

Melsen

Cattaneo

2012

The Angle Orthodontist

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Objective: (1) To report the thickness of the cortical bone in insertion sites commonly used for orthodontic mini-implants, (2) to assess the impact of a change in insertion angle on primary cortical bone-to-implant contact, and (3) to evaluate the risk of maxillary sinus perforation. Materials and Methods: At autopsy, 27 human samples containing three to five adjacent teeth were excised and scanned using a table-top micro-computed tomography system. Bone thickness measurements were taken at 45u and 90u to the long the axis of the adjacent teeth, simulating a mini-implant insertion at the mid-root level. Results: In the maxilla, the overall mean cortical thickness at 90u was 0.7 mm buccally in the lateral region, 1.0 mm buccally in the anterior region, and 1.3 mm palatally. In the mandible, the mean cortical thickness was 0.7 mm buccally and 1.8 mm lingually in the anterior region; 1.9 mm buccally and 2.6 mm lingually in the lateral region. Changing the insertion angle from 90u to 45u increased the cortical bone-to-implant contact by an average of 47%. Perpendicular insertion at the mid-root level only rarely interfered with the sinus, whereas apically inclined insertion increased the risk of sinus perforation. Conclusions: Buccally and palatally in the maxilla and buccally in the anterior mandible, the thickness of the alveolar cortical bone is often less than 1 mm. In contrast, the alveolar cortical bone is frequently thicker than 2 mm laterally in the mandible. Changing the insertion angle to 45u will generally enhance implant stability but increase the risk of perforation to the maxillary sinus. (Angle Orthod. 2013;83:222-229.)

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“…The failure rate is known to be more increased in the mandible compared to the maxilla. [9][10][11][12] Baumgaertel and Hans 13 and Lim et al 14 reported that the buccal cortical bone was thicker in the mandible than in the maxilla and that the buccal cortical bone thickness in the mandibular posterior area ranged from 1.50 mm to 3.65 mm. Implant site preparation, such as that associated with predrilling of the thick buccal cortical bone in the mandibular posterior area, can lower the insertion torque into the appropriate range.…”

Section: Introductionmentioning

confidence: 99%

Effects of predrilling depth and implant shape on the mechanical properties of orthodontic mini-implants during the insertion procedure

Cho

Baek

2012

The Angle Orthodontist

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Objective: To investigate the effects of orthodontic mini-implant (OMI) shape and predrilling depth on the mechanical properties of OMIs during the insertion procedure. Materials and Methods: A total of 30 OMIs (self-drilling type, 7 mm in length; Biomaterials Korea Inc) were allocated into six groups according to OMI shape (cylindrical and tapered type) and predrilling depth (control, 1.5-mm and 3.0-mm predrilling; predrilled with a drill-bit [1 mm in diameter]): C-con, C-1.5, C-3.0, T-con, T-1.5, and T-3.0 groups (N 5 5 per group). The OMIs were installed in artificial bone blocks with two layers that simulated the cortical and cancellous bone (SawboneH, Pacific Research Laboratories Inc). Total insertion time (TIT), maximum insertion torque (MIT), total insertion energy (TIE), and inclination of the time-torque graph (INC) were measured. Results: Within the same shape group, although predrilling groups exhibited shorter TIT than control groups (control vs 1.5; control vs 3.0; all P , .05), there was no difference in TIT between 1.5-mm and 3.0-mm predrilling groups. MIT and TIE decreased in the order of control, 1.5-mm predrilling, and 3.0-mm predrilling (control vs 1.5; 1.5 vs 3.0; all P , .05), but INC revealed a pattern of increase from control to 1.5-mm predrilling and of decrease from 1.5-mm predrilling to 3.0-mm predrilling within the same shape group (control vs 1.5, 1.5 vs 3.0, all P , .05). The MIT and INC of C-con were smaller and less steep than those of T-con (P , .01 and P , .05, respectively). In the same predrilling depth, no differences were observed in MIT, INC, and TIE between cylindrical and tapered groups. Conclusion: In cases of thick cortical bone, predrilling might be an effective tool for reducing microdamage without compromising OMI stability. (Angle Orthod. 2012;82:618-624.)

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Comparison of cortical bone thickness and root proximity at maxillary and mandibular interradicular sites for orthodontic mini‐implant placement

Abstract: Based on our results, cortical bone thickness depends on the interradicular site rather than sex or individual differences.

Cited by 44 publications

References 13 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

An evaluation of insertion sites for mini-implants

Effects of predrilling depth and implant shape on the mechanical properties of orthodontic mini-implants during the insertion procedure

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