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The effect of low level laser on condylar growth during mandibular advancement in rabbits.

Abtahi M, Poosti M, Saghravanian N, Sadeghi K, Shafaee H - Head Face Med (2012)

Bottom Line: It has been shown that Low Level Laser (LLL) has a positive effect on bone formation.The formation of fibrous tissue was significantly lower, while bone formation was significantly greater in lased group as compared with control group.The thickness of cartilage did not differ significantly between two groups.

View Article: PubMed Central - HTML - PubMed

Affiliation: Orthodontic Dept, Islamic Azad University, Tehran, Iran.

ABSTRACT

Introduction: It has been shown that Low Level Laser (LLL) has a positive effect on bone formation. The aim of this study was to evaluate the effect of low level laser on condylar growth during mandibular advancement in rabbits.

Materials and methods: Continuous forward mandibular advancement was performed in fourteen male Albino rabbits with the mean age of 8 weeks and the mean weight of 1.5 ± 0.5 kg, with acrylic inclined planes. The rabbits were randomly assigned into two groups after 4 weeks. LLL (KLO3: wave length 630 nm) was irradiated at 3 points around the TMJ, through the skin in the first group. The exposure was performed for 3 minutes at each point (a total of 9 minutes) once a day for 3 weeks. The control group was not exposed to any irradiation. The rabbits in both groups were sacrificed after two months and the histological evaluation of TMJ was performed to compare fibrous tissue, cartilage, and new bone formation in condylar region in both groups. Disc displacement was also detected in both groups. Student's t-test, Exact Fisher and Chi square tests were used for the statistical analysis.

Results: The formation of fibrous tissue was significantly lower, while bone formation was significantly greater in lased group as compared with control group. The thickness of cartilage did not differ significantly between two groups.

Conclusion: Irradiation of LLL (KLO3) during mandibular advancement in rabbits, increases bone formation in condylar region, while neither increase in the cartilage thickness nor fibrous tissues was observed.

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Figure 1: bite jumper appliance.

Mentions: This study was approved by ethical committee of Mashhad University of Medical sciences. (Code: 88349). Fourteen male white Albino rabbits with the mean age of 8 weeks and the mean weight of 1.5 ± 0.5 kg were selected. All the animals had intact central incisors in the upper and lower arch. Under general anesthesia (intramascular injection of 1 ml Xylazine and Ketamin with 1:2 ratio) primary impressions were obtained from maxilla and after constructing special trays secondary impressions were taken and plaster models were made. Identical acrylic inclined planes were constructed for the anterior teeth of rabbits, to serve as functional appliances and create continuous forward mandibular advancement. These appliances were bonded to upper central incisors by self cure composite.(Figure 1)


The effect of low level laser on condylar growth during mandibular advancement in rabbits.

Abtahi M, Poosti M, Saghravanian N, Sadeghi K, Shafaee H - Head Face Med (2012)

bite jumper appliance.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3298697&req=5

Figure 1: bite jumper appliance.
Mentions: This study was approved by ethical committee of Mashhad University of Medical sciences. (Code: 88349). Fourteen male white Albino rabbits with the mean age of 8 weeks and the mean weight of 1.5 ± 0.5 kg were selected. All the animals had intact central incisors in the upper and lower arch. Under general anesthesia (intramascular injection of 1 ml Xylazine and Ketamin with 1:2 ratio) primary impressions were obtained from maxilla and after constructing special trays secondary impressions were taken and plaster models were made. Identical acrylic inclined planes were constructed for the anterior teeth of rabbits, to serve as functional appliances and create continuous forward mandibular advancement. These appliances were bonded to upper central incisors by self cure composite.(Figure 1)

Bottom Line: It has been shown that Low Level Laser (LLL) has a positive effect on bone formation.The formation of fibrous tissue was significantly lower, while bone formation was significantly greater in lased group as compared with control group.The thickness of cartilage did not differ significantly between two groups.

View Article: PubMed Central - HTML - PubMed

Affiliation: Orthodontic Dept, Islamic Azad University, Tehran, Iran.

ABSTRACT

Introduction: It has been shown that Low Level Laser (LLL) has a positive effect on bone formation. The aim of this study was to evaluate the effect of low level laser on condylar growth during mandibular advancement in rabbits.

Materials and methods: Continuous forward mandibular advancement was performed in fourteen male Albino rabbits with the mean age of 8 weeks and the mean weight of 1.5 ± 0.5 kg, with acrylic inclined planes. The rabbits were randomly assigned into two groups after 4 weeks. LLL (KLO3: wave length 630 nm) was irradiated at 3 points around the TMJ, through the skin in the first group. The exposure was performed for 3 minutes at each point (a total of 9 minutes) once a day for 3 weeks. The control group was not exposed to any irradiation. The rabbits in both groups were sacrificed after two months and the histological evaluation of TMJ was performed to compare fibrous tissue, cartilage, and new bone formation in condylar region in both groups. Disc displacement was also detected in both groups. Student's t-test, Exact Fisher and Chi square tests were used for the statistical analysis.

Results: The formation of fibrous tissue was significantly lower, while bone formation was significantly greater in lased group as compared with control group. The thickness of cartilage did not differ significantly between two groups.

Conclusion: Irradiation of LLL (KLO3) during mandibular advancement in rabbits, increases bone formation in condylar region, while neither increase in the cartilage thickness nor fibrous tissues was observed.

Show MeSH
Related in: MedlinePlus