Five-year experience with orthodontic miniscrew implants: A retrospective investigation of factors influencing success rates

Antoszewska, Joanna; Papadopoulos, Moschos A.; Park, Hyo‐Sang; Ludwig, Björn

doi:10.1016/j.ajodo.2009.03.032

Cited by 94 publications

(95 citation statements)

References 22 publications

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“…12 Because we used commercially available designs, the length of cylindrical designs (5.5 mm) was shorter than that of tapered designs (6.1 mm). Numerous studies [25][26][27][28][29] have established a consensus that screw length is not associated with failure or stability, and our study also highlighted the importance of engagement in cortical bone. Thus, differences in length can be deemed to have little impact in comparisons of stability in this study.…”

Section: Discussionmentioning

confidence: 54%

Stability comparison between commercially available mini-implants and a novel design: Part 1

Hong¹,

Lee²,

Webster³

et al. 2011

The Angle Orthodontist

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Objective: To compare mechanical stability among five mini-implant designs-a newly invented design and four commercially available designs that vary by shape and threading; to calculate external surface area of each design using high-resolution micro-computed tomography; and to evaluate the relationship between surface area and stability results. Materials and Methods: The four commercially available mini-implants-single-threaded and cylindrical (SC), single-threaded and tapered (ST), double-threaded and cylindrical (DC), doublethreaded and tapered (DT)-and a new implant that is designed to engage mostly in cortical bone with shorter and wider dimensions (N1) were inserted in simulated bone with cortical and trabecular bone layers. The mechanical study consisted of torque measurements and lateral displacement tests. External surface area was computed using a 25-mm micro-CT. Results: Maximum insertion torque, maximum removal torque, and force levels for displacements were the highest in N1, followed by DT, ST, DC, and SC (a 5 .05). The surface area was largest in DT, followed by N1, ST, DC, and SC. Surface area engaged in cortical bone, however, was the greatest in N1. The surface area of mini-implants had positive correlation with stability. Conclusion: Among commercial designs, both added tapering and double threading improved stability. N1 was the most stable design within this research design. The new design has the potential to be clinically superior; it has enhanced stability and there is diminished risk of endangering nearby anatomic structures during placement and orthodontic treatment, but the design requires refinements to reduce insertion torque to avoid clinical difficulty and patient discomfort. (Angle

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Section: Discussionmentioning

confidence: 54%

Stability comparison between commercially available mini-implants and a novel design: Part 1

Hong¹,

Lee²,

Webster³

et al. 2011

The Angle Orthodontist

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“…Amongst these categories, some variables deserve special attention from the orthodontists because they are related to the necessary knowledge for the orthodontic diagnosis (facial pattern) (3,4), orthodontic mechanics (upper/lower jaw (5,6), insertion side (5,7), type of desired movement (4,8,9), and for the installation of the microscrew (caliber of the microscrew), teacher/student (10), learning curve (9,11,12).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Factors Associated with Orthodontic Microscrew Failure

Dobranszki

Faber

Scatolino³

et al. 2014

Braz. Dent. J.

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The objective of this study was to examine whether factors such as insertion site, patient's facial pattern, microscrew features, type of tooth movement desired, level of experience handling orthodontic microscrews and operator expertise were associated with failure of microscrews. After the approval of an ethics committee, 166 patients of one practice signed an informed consent and received 293 microscrews randomly distributed by 3 operators with different levels of practical experience and expertise in handling microscrews. The microscrews were observed in a period of 365 days or as long as orthodontic forces had to be applied and independent variables were recorded. Analysis by the chi-square test did not produce enough evidence as to allow the assertion that there was an association between the variable "failure" and the variables "maxilla" (p=0.4775), "face" (p=0.1081), "facial pattern" (p=0.7522), "microscrew length" (p=0.9113), "desired movement" (p=0.0584), and "operator" (p=0.5785). The variable "insertion side" was significantly associated with "failure" (p=0.0022). In a 365-day survival analysis, the Log Rank test yielded a p-value of 0.00178 for the curve of variable "insertion side," and showed no significant differences for other variables. With a total success rate of 87.38%, the only variable found to be significant was "insertion side" (p=0.0022), with 3.088 more likelihood of a microscrew failing if placed on the left side than on the right side. The procedure of inserting microscrews involved a rapid learning curve for an inexperienced operator, which justifies their placement by orthodontists.

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“…After the introduction of MIs to orthodontic practice, several studies investigated MI success rates and factors associated with MI failure (1,(5)(6)(7)(8)(9)(10). However, previous studies did not consistently define these outcomes, which complicate subsequent follow-up studies of MI success and failure rates.…”

Section: Discussionmentioning

confidence: 98%

A prospective study of factors associated with orthodontic mini-implant survival

et al. 2016

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Five-year experience with orthodontic miniscrew implants: A retrospective investigation of factors influencing success rates

Cited by 94 publications

References 22 publications

Stability comparison between commercially available mini-implants and a novel design: Part 1

Stability comparison between commercially available mini-implants and a novel design: Part 1

Analysis of Factors Associated with Orthodontic Microscrew Failure

A prospective study of factors associated with orthodontic mini-implant survival

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