Root proximity and cortical bone thickness effects on the success rate of orthodontic micro-implants using cone beam computed tomography

Min, Kyung-Inn; Kim, Sang-Cheol; Kang, Kyung‐Hwa; Cho, Jin-Hyoung; Lee, Eon-Hwa; Chang, Na‐Young; Chae, Jong‐Moon

doi:10.2319/091311-593.1

Cited by 50 publications

(43 citation statements)

References 18 publications

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“…Although some researchers reported that there is no relationship between the cortical bone thickness and the stability of the mini screw, [40][41][42] others reported an opposing argument. 43,44 According to the results of the present study, there was no statistically significant difference among the groups. This outcome may be associated with providing adequate stability of the mini screws for maintaining stability until the end of the experiment.…”

Section: Discussionmentioning

confidence: 48%

Histomorphometric Evaluation of the Effects of Various Diode Lasers and Force Levels on Orthodontic Mini Screw Stability

Göymen

İşman

Taner

et al. 2015

Photomedicine and Laser Surgery

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Objective: The purpose of this study was to evaluate the effects of different laser dose and force levels on the stability of orthodontic mini screws used for anchorage, by histomorphometric analyses. Background data: Low-level laser therapy speeds up blood flow, improves the mechanism of the revitalization processes, reduces the risk of infection, boosts metabolic activities, and accelerates the healing of the damaged tissue. Although there are many research studies about low-level laser therapy applications in a variety of areas, no investigations were found concerning mini screw stability using various laser dose levels with different force level applications. Methods: Seventeen New Zealand white rabbits were used. A total of 68 cylindrical, self-drilling orthodontic mini screws were threaded at the fibula. Experimental subjects were divided into six groups; force application was not performed in the first three groups, whereas 150g of force was applied via nickel-titanium closed-coil springs placed between two mini screws in the other three groups. Measurements of the initial torque values (10 Ncm) were manipulated by a digital portable torque gauge. Various low-level laser doses were applied to the groups during the postoperative 10 days. After 4 weeks, bone-to-implant contact and cortical bone thickness were histomorphometrically analyzed. Results: In the 150g force plus 20 J/cm 2 dosage group, the highest bone-to-implant contact values were observed. ( p < 0.05) There were no statistically significant correlations between cortical bone thickness and bone-to-implant contact values; on the other hand, no significant difference was found among the same groups in terms of cortical bone thickness values ( p > 0.05). Conclusions: Low-level laser therapy was noticed to induce the mini screw-bone contact area. Low-level laser therapy may be a supplementary treatment method to increase the stability of the orthodontic mini screw.

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Section: Discussionmentioning

confidence: 48%

Histomorphometric Evaluation of the Effects of Various Diode Lasers and Force Levels on Orthodontic Mini Screw Stability

Göymen

İşman

Taner

et al. 2015

Photomedicine and Laser Surgery

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“…Some researchers found statistical significance and a higher success rate on the left side (5), as the same meaning found to be significant in this study, but on the opposite side (right). This side also exhibited greater failure rates in other studies, with (22) or without (1,4,15,16) statistically significant evidence to account for differences in the success rate. This result may be related to factors such as preferred side of mastication, access difficulties when placing the OMS or viewing the right or left side (7,10,22), different levels of oral hygiene among righties and lefties (23,24), and random statistical errors (5).…”

Section: Discussionmentioning

confidence: 67%

“…An orthodontic force of less than 200 g (cN) (4,8,(13)(14)(15) was applied immediately after placement of each OMS (5,8,11,13,14) by means of elastomeric chains (3,8,11,15). Analgesics were prescribed for the day of OMS placement.…”

Section: Methodsmentioning

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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“…Min et al (23) investigated the effects of root proximity on the success rate of a narrow screw (diameter 1.2-1.3 mm) and reported that the failure rate of the rootcontacting screw was about 70%. In contrast, of the 35 screws with root contact in the current study, 29 (about 83%) survived.…”

Section: Discussionmentioning

confidence: 99%

Root proximity and stability of orthodontic anchor screws

Shigeeda¹

2014

J Oral Sci

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This study aimed to investigate a causal relationship between the stability of orthodontic anchor screws (screws) and the degree of their proximity to the root (root proximity) using mobility test device (Periotest) and cone-beam computed tomography (CBCT). In total, 165 (diameter 1.6 mm; length 8 mm) screws in 58 patients (average age, 24.4 ± 8.5 years) were evaluated. After screw placement, CBCT was used for diagnostic imaging of the area around the site. Root proximity was evaluated and categorized into three groups: A, no contact; B, single contact; and C, multi-contact. The Periotest value was used to assess screw stability. The screw failure rate according to root proximity significantly differed between categories A and C. In addition, failure rate significantly differed between mandibular screws with and without root contact. Periotest values in categories A and C were significantly higher in the mandible than in the maxilla. Mandibular screws had greater mobility than maxillar screws, even when the screw avoided root contact. The lower stability of mandibular screws with root contact might be related to their greater mobility. (J Oral Sci 56, 59-65, 2014)

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Root proximity and cortical bone thickness effects on the success rate of orthodontic micro-implants using cone beam computed tomography

Abstract: When inserting OMIs, increasing the distance from the OMI to the root surface will significantly improve success rates.

Cited by 50 publications

References 18 publications

Histomorphometric Evaluation of the Effects of Various Diode Lasers and Force Levels on Orthodontic Mini Screw Stability

Histomorphometric Evaluation of the Effects of Various Diode Lasers and Force Levels on Orthodontic Mini Screw Stability

Analysis of Factors Associated with Orthodontic Microscrew Failure

Root proximity and stability of orthodontic anchor screws

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