Computed tomographic characterization of mini-implant placement pattern and maximum anchorage force in human cadavers

Lemieux, Genevieve; Hart, Adam; Cheretakis, Chrissy; Goodmurphy, Craig; Trexler, Stephanie E.; McGary, Christopher M.; Retrouvey, Jean-Marc

doi:10.1016/j.ajodo.2010.05.024

Cited by 37 publications

(21 citation statements)

References 35 publications

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“…24, 25 For greater reliability of the obtained results and to reduce standard deviation, we used more cadavers than the average commonly reported in the literature for this type of study 14 26 - 31 …”

Section: Discussionmentioning

confidence: 99%

Effect of vertical placement angle on the insertion torque of mini-implants in human alveolar bone

Maya

Pinzan-Vercelino

Gurgel

2016

Dental Press J. Orthod.

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Objective: The aim of the present ex-vivo study was to evaluate the effect of the vertical placement angle of mini-implants on primary stability by analyzing maximum insertion torque (MIT). Methods: Mini-implants were placed in 30 human cadavers, inserted at either a 90° or 60° angle to the buccal surface of the maxillary first molar. Out of 60 self-drilling mini-implants used, half were of the cylindrical type and half were of the conical type. Primary stability was assessed by means of measuring the MIT. Data were subjected to analysis of variance (ANOVA) and Newman-Keuls tests. A significance level of 5% was adopted. Results: The MIT was higher for both mini-implant types when they were placed at a 90° angle (17.27 and 14.40 Ncm) compared with those placed at a 60° angle (14.13 and 11.40 Ncm). Conclusions: MIT values were differed according to the vertical mini-implant placement angle in the maxillary posterior area. Regardless of the type of mini-implant used, placement at a 90° angle resulted in a higher MIT.

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Section: Discussionmentioning

confidence: 99%

Effect of vertical placement angle on the insertion torque of mini-implants in human alveolar bone

Maya

Pinzan-Vercelino

Gurgel

2016

Dental Press J. Orthod.

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“…9,10,[17][18][19][20] Long mini-implants of 8 to 10 mm have been reported to be associated with a higher risk of sinus membrane perforation than the shorter mini-implants of 6 mm. 21 The purpose of this study was to: (1) provide detailed information of the cortical thickness in the most commonly used insertion sites, (2) assess how a change in the insertion angle influences the primary cortical bone-to-implant contact, and (3) evaluate the risk of sinus perforation during mini-implant insertion.…”

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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“…Long miniscrews of 8 to 10 mm have been reported to be associated with a higher risk of sinus membrane perforation than the shorter miniscrews of 6 mm [34].…”

Section: Safe Zone For Miniscrew Placement In Posteriormentioning

confidence: 96%

Inferior Level of Maxillary Sinus and Cortical Bone Thickness at Maxillary Posterior Quadrant, in Three Different Growth Patterns: 3D-Computed Tomographic Study

Vibhute

Patil

2014

Journal of Oral Implants

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Objective of this retrospective study was to measure cortical bone thickness and lowest level of maxillary sinus at maxillary posterior quadrant in different growth pattern (hypodivergent, average, and hyperdivergent) at prospective microimplant placement sites in order to understand both safety and stability aspects of microimplant placement by using cone-beam 3-dimensional computed tomographic images. In posterior quadrant, vertical distance from cementoenamel junction to lowest level of maxillary sinus at interradicular region was measured. Buccal cortical bone thickness was measured at 3 different vertical levels at interradicular space. The cortical bone thickness was found more at sinus floor level and above it than below the sinus floor. In perspective of miniscrew placement, study shows that maxillary sinus floor is safer with average and hyperdivergent growth pattern than hypodivergent growth pattern. In the proximity of maxillary sinus floor, 1 mm or more cortical bone can be expected in maxillary posterior region in average and hyperdivergent growth patterns. However, it was thicker in hypodivergent than hyperdivergent growth patterns. Hypodivergent patients require either more horizontal insertion (more parallel to occlusal plane) or shorter length of miniscrew to avoid damage to maxillary sinus.

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Computed tomographic characterization of mini-implant placement pattern and maximum anchorage force in human cadavers

Cited by 37 publications

References 35 publications

Effect of vertical placement angle on the insertion torque of mini-implants in human alveolar bone

Effect of vertical placement angle on the insertion torque of mini-implants in human alveolar bone

An evaluation of insertion sites for mini-implants

Inferior Level of Maxillary Sinus and Cortical Bone Thickness at Maxillary Posterior Quadrant, in Three Different Growth Patterns: 3D-Computed Tomographic Study

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