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. 2010 Mar;80(2):385-90.
doi: 10.2319/051609-268.1.

Laser-aided circumferential supracrestal fiberotomy and low-level laser therapy effects on relapse of rotated teeth in beagles

Su-Jung Kim  1 , Joo-Hee Paek, Ki-Ho Park, Seung-Goo Kang, Young-Guk Park
Affiliations

Laser-aided circumferential supracrestal fiberotomy and low-level laser therapy effects on relapse of rotated teeth in beagles

Su-Jung Kim et al. Angle Orthod. 2010 Mar.

Erratum in

  • Angle Orthod. 2011 Jul;81(4):738

Abstract

Objective: To investigate the effectiveness and periodontal side effects of laser circumferential supracrestal fiberotomy (CSF) and low-level laser therapy (LLLT) on orthodontically rotated teeth in beagles.

Materials and methods: Eighteen mandibular incisors from nine dogs were divided into three groups by treatment (n = 6/group): A, orthodontic couple force application only (control); B, laser CSF following orthodontic couple force application; and C, LLLT following orthodontic couple force application. Both mandibular lateral incisors were rotated for 4 weeks, and the relapse tendency was observed for 4 weeks more without any retainers. The amount of relapse, sulcus depth, and gingival recession were measured at weeks 4 and 8. One-way analysis of variance (ANOVA) and Scheffé's post hoc test were used for data analysis. Tissue specimens were examined at week 8 under light microscopy after hematoxylin-eosin (H&E) and Masson's trichrome staining.

Results: The mean percentage of relapse was 41.29% in group A, 14.52% in group B, and 56.80% in group C (P < .001). Four weeks after laser CSF, the sulcus depth increased by 0.67 mm, but no gingival recession was observed. There was no significant difference between groups A and C in terms of sulcus depth and gingival recession.

Conclusions: Laser CSF is an effective procedure to decrease relapse after tooth rotation, causing no apparent damage to the supporting periodontal structures, whereas LLLT on orthodontically rotated teeth without retainers appears to increase the relapse tendency.

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Figures

Figure 1
Figure 1
Photographs of orthodontic buttons with elastic chains. (A) Occlusal view. (B) Frontal view.
Figure 2
Figure 2
The cast was placed on a prosthetic surveyor and photographed on a Kaiser copy stand. (A) Kaiser copy stand. (B) Prosthetic surveyor with dental cast.
Figure 3
Figure 3
Photographs of the dental casts. (A) Day 1. (B) Week 4.
Figure 4
Figure 4
Percentage of relapse in the control, laser CSF, and LLLT groups. Asterisk indicates a significant difference between groups (P < .001). Values are mean ± SD.
Figure 5
Figure 5
Graph of the changes of gingival sulcus depth.
Figure 6
Figure 6
Graph of the changes of gingival height.
Figure 7
Figure 7
Group A. Supracrestal fibers disclosed a fiber pattern with the nonrotated central incisors. (A) H&E staining, 100×, (B) Masson's Trichrome staining, 40×, (C) 200×; R, experimental tooth root; S, supracrestal fiber; N, nonrotated tooth.
Figure 8
Figure 8
Group B. Rearrangement of fibrous structures had taken place. (A) H&E staining, 100×, (B) Masson's Trichrome staining, 40×, (C) 200×; R, experimental tooth root; S, supracrestal fiber.
Figure 9
Figure 9
Group C. Thickness of the fiber bundle and the phase of blood vessels are arranged similarly to the control group. (A) H&E staining, 100×, (B) Masson's Trichrome staining, 40×, (C) 200×; R, experimental tooth root; S, supracrestal fiber.
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References

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