Placement angle effects on the success rate of orthodontic microimplants and other factors with cone-beam computed tomography

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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“…2 CBT values were calculated by taking the average of measurements contacting the mini screw on both sides 18 (Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

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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“…Jung et al 39 reported that there was no statistically significant difference in the vertical and horizontal screw placement angles between the successful and failed groups with the self-drilling method. Our results are consistent with this.…”

Section: Discussionmentioning

confidence: 98%

Effects of tooth root contact on the stability of orthodontic anchor screws in the maxilla: Comparison between self-drilling and self-tapping methods

Iwai

Motoyoshi

Uchida

et al. 2015

American Journal of Orthodontics and Dentofacial Orthopedics

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“…Once again, the findings confirmed Wolff’s law that healthy physiological load strengthens the bone, even in the mini environment between two teeth. 14 Because of the small interradicular spaces and risk of root proximity, 15–17 the safest strategy is most likely to place every MSI in the middle of the interproximal site. 8 Nevertheless, in certain clinical scenarios MSIs may need to be placed immediately adjacent to the anchor teeth to achieve treatment goals.…”

Section: Discussionmentioning

confidence: 99%

A CBCT atlas of buccal cortical bone thickness in interradicular spaces

Holmes¹,

Wolf

Zhou

2015

The Angle Orthodontist

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Objective To provide a road map of buccal cortical bone thickness in interradicular locations where miniscrew implants are commonly placed. Materials and Methods Cone-beam computed tomography images from 100 study quadrants (50 maxillary and 50 mandibular) were studied. Cortical bone thickness was measured at the most mesial point, the midpoint, and the most distal point in interradicular areas from the canine to the first molar in both arches at 4 mm and 6 mm from the alveolar ridge. Indicator variables of whether the cortical bone thickness was thinner than 1 mm and thicker than 1.5 mm were constructed and analyzed in a general linear mixed model. Results Buccal cortical bone was significantly thinner at a point bisecting two teeth than the bone adjacent to the teeth (P < .0001). The site with the greatest percentage of measurements <1 mm (20%) was at the midpoint bisecting the mandibular canine and the first premolar. The site with the highest percentage of measurements >1.5 mm (50%) was in the mandible adjacent to the first molar (distal to the midpoint of the second premolar and first molar) at 6 mm from the alveolar crest. Conclusion Cortical bone thickness is significantly thinner centrally between two teeth than in the areas adjacent to the roots.

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Placement angle effects on the success rate of orthodontic microimplants and other factors with cone-beam computed tomography

Cited by 33 publications

References 20 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

Effects of tooth root contact on the stability of orthodontic anchor screws in the maxilla: Comparison between self-drilling and self-tapping methods

A CBCT atlas of buccal cortical bone thickness in interradicular spaces

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