scholarly journals Phototherapy is unable to exert beneficial effects on orthodontic tooth movement in rat molars

2019 ◽  
Vol 89 (6) ◽  
pp. 936-941 ◽  
Author(s):  
Simone P. Friedrichsdorf ◽  
Emily Zaniboni ◽  
Alyne Simões ◽  
Victor E. Arana-Chavez ◽  
Gladys C. Dominguez
Keyword(s):  
Laser Irradiation ◽  
Tooth Movement ◽  
Root Resorption ◽  
Light Emitting Diode ◽  
Orthodontic Tooth Movement ◽  
Male Rats ◽  
Light Emitting ◽  
Beneficial Effects ◽  
Infrared Laser Irradiation ◽  
Rat Molars

ABSTRACT Objectives: To investigate the effects of irradiation lasers and light-emitting diode (LED) light on root resorption in rat molars during orthodontic tooth movement (OTM). Materials and Methods: Twenty-one 12-week-old Wistar male rats were divided into three groups: OTM only (control [CG]), OTM and LED irradiation (DG), and OTM and low laser irradiation therapy (LG). The distance between the first and second molars was used to evaluate the amount of tooth movement. The mesial surfaces of the distopalatal roots were analyzed by scanning electron microscopy, and the area of the resorption was calculated. Results: Statistical analysis showed a decreased amount of tooth movement in the exposed DG or LG compared with CG, which was statistically significant (P = .031 and P = .004, respectively). However, when the DG and LG groups were compared, no statistically significant differences were found (P = .504). The root resorption areas were similar between CG and DG. However, statistically significant differences were found between LG and CG (P = .014) and LG and DG (P = .038). Conclusions: Phototherapy did not enhance tooth movement, while infrared laser irradiation did increase root resorption.

scholarly journals The past and present research at the University of Sydney’s Discipline of Orthodontics

2021 ◽  
Vol 11 ◽  
pp. 90-99
Author(s):  
Narayan H. Gandedkar ◽  
Oyku Dalci ◽  
M. Ali Darendeliler
Keyword(s):  
Tooth Movement ◽  
Root Resorption ◽  
Light Emitting Diode ◽  
Orthodontic Tooth Movement ◽  
Stimulated Emission ◽  
Low Level Laser Therapy ◽  
Light Emitting ◽  
Level Laser ◽  
Light Amplification ◽  
The University

The University of Sydney’s Discipline of Orthodontics has been actively pursuing research in the areas of root resorption, sleep apnea, magnets in orthodontics, implants, acceleration of orthodontic tooth movement (OTM), and remote monitoring (RM). Our research has shed light on many specific factors that influence orthodontically induced inflammatory root resorption (OIIRR). We also explored the effects of some of the most discussed acceleration interventions on OTM and OIIRR, such as vibration, micro-osteoperforations, piezocision, low-level laser therapy, light emitting diode, light amplification by stimulated emission of radiation, and pharmacological substances. Further, we have researched into maximizing orthopedic treatment outcomes of maxillary deficient children with use of intraoral force application with utilization of miniscrew-assisted rapid palatal expander. We are currently trialing use of RM to facilitate orthodontic services in the public dental clinics.

scholarly journals Effects of Gradually Increasing Force Generated by Permanent Rare Earth Magnets for Orthodontic Tooth Movement

2006 ◽  
Vol 76 (6) ◽  
pp. 1004-1009 ◽  
Author(s):  
Ryo Tomizuka ◽  
Hiroyasu Kanetaka ◽  
Yoshinaka Shimizu ◽  
Akihiro Suzuki ◽  
Kaoru Igarashi ◽  
...  
Keyword(s):  
Rare Earth ◽  
Tooth Movement ◽  
Root Resorption ◽  
Orthodontic Tooth Movement ◽  
Male Rats ◽  
Control Group ◽  
Pathological Changes ◽  
Group I ◽  
Group Ii ◽  
Experimental Group

Abstract Objective: To examine the effects of gradually increasing force generated by permanent rare earth magnets for orthodontic tooth movement by using a novel experimental rat model and computer simulation. Materials and Methods: Fifty-five male rats (age 18 weeks) were used as animal experiments. Magnetic (experimental groups) or titanium (control group) cuboids (1.5 × 1.5 × 0.7 mm) were bonded to the lingual surface of the maxillary first molars. The initial distance between materials was 1.0 mm, generating 4.96 gf (experimental group I), or 1.5 mm, generating 2.26 gf (experimental group II). Tooth movement was measured and periodontal structures were observed with microfocus x-ray computed tomography radiographs. Results: The distance between the magnets decreased with time in experimental groups I and II (P < .001), whereas there was no tooth displacement in the control group. Experimental group I showed rapid tooth movement in the initial phase followed by slower tooth movement. Experimental group II showed gradual tooth movement. Horizontal sections on microfocus computed tomgraphy radiographs revealed no pathological changes, such as root resorption, on the compressed side in the experimental groups. Conclusions: The initial light force and gradual increasing force in magnetic attractive force induced effective tooth movement in rats without inducing any pathological changes.

scholarly journals Infrared Light-Emitting Diode (LED) Effects on Orthodontic Tooth Movement

2019 ◽  
Vol 30 (4) ◽  
pp. 410-416 ◽  
Author(s):  
Simone Peixe Friedrichsdorf ◽  
Victor Elias Arana-Chavez ◽  
Vivian Bradaschia-Correa ◽  
Paolo Maria Cattaneo ◽  
Gladys Cristina Dominguez
Keyword(s):  
Tooth Movement ◽  
Root Resorption ◽  
Light Emitting Diode ◽  
Histological Study ◽  
Orthodontic Tooth Movement ◽  
Infrared Light ◽  
Tartrate Resistant Acid Phosphatase ◽  
Micro Computed Tomography ◽  
Led Phototherapy ◽  
Significant Difference

Abstract The present study aimed to analyze the effect of LED phototherapy on the presence of hyalinization and root resorption during orthodontic tooth movement (OTM) in rats and to measure the amount of tooth movement. Eighty rats were allocated into two groups: LED and control (CON), where the LED rats were irradiated with infrared LED (850 nm, 30 mW) for 5 min during the first five days of OTM and where controls were not irradiated. Both groups were subdivided into four subgroups (n=10) according to the date of euthanasia (4, 7, 14 and 21 days). Five out of ten LED21 and five of ten CON21 rats were submitted to micro-computed tomography (μCT); μCT scans were taken on days 0, 7, 14 and 21. For histological study, maxillae were processed to light microscopy using Hematoxylin-Eosin (HE) and Tartrate-Resistant Acid Phosphatase (TRAP) histochemistry. The amount of tooth movement did not differ between LED and CON. Hyalinization was observed at the pressure areas in both groups, and it did not show a statistically significant difference between the groups. Root resorption was also observed in both groups after 7 days and it did not represent any differences between the two groups. LED phototherapy was not able to increase the amount of OTM. Similar characteristics of hyalinization and root resorption were observed in both groups.

scholarly journals Effect of Blue-Light-Emitting Diode Exposure on Collagen Density of Periodontal Ligament During Orthodontic Tooth Movement in Rats

2021 ◽  
Vol 12 (6) ◽  
pp. 8231-8240
Keyword(s):  
Blue Light ◽  
Periodontal Ligament ◽  
Wistar Rats ◽  
Tooth Movement ◽  
Light Emitting Diode ◽  
Orthodontic Tooth Movement ◽  
Control Group ◽  
Light Emitting ◽  
Male Wistar Rats ◽  
Collagen Density

Photobiomodulation therapy using Light Emitting Diode (LED) with a certain period and intensity can stimulate tissue repair and accelerate orthodontic tooth movement. During remodeling, collagen on periodontal ligaments was formed on the pressure and tension sides. The aim of this study was to investigate the effect of exposure time and observation day of blue LED on the collagen density of periodontal ligament of the pressure and tension sides of Wistar rats. Forty-eight male Wistar rats aged 3-4 months weighing 300-500 grams were divided into four groups: the control group; the group exposed to LED with λ1000 nm of 490 mW/cm2 for 25, 30, and 35 seconds once a day. In addition, their mandibular inter-incisor was administered with thirty-five grams orthodontic force using an open coil spring. The calculations on the collagen density of pressure and tension sides were carried out on days 0, 3, 7, and 14 using the TinEye application. Statistical analysis test was conducted using two-way ANOVA and LSD post hoc test. The results showed a more significant increase in the collagen density of the pressure and tension sides than that of the control group (p <0.05). The collagen density of pressure and tension sides reach the highest point at 30 seconds exposure followed by 35 and 25 seconds. The collagen density of pressure sides decreased on the 3rd day and increased afterward, and the tension sides continued to increase on the 3rd day afterward. The study showed that blue light LEDs were able to increase collagen density on the pressure and tension sides, with optimal exposure at 30 seconds, and it reached the highest point at day 14.

Sympathectomy causes increased root resorption after orthodontic tooth movement in rats: immunohistochemical study

2003 ◽  
Vol 313 (2) ◽  
pp. 167-175 ◽  
Author(s):  
Sivakami Rethnam Haug ◽  
Pongsri Brudvik ◽  
Inge Fristad ◽  
Karin J. Heyeraas
Keyword(s):  
Tooth Movement ◽  
Root Resorption ◽  
Immunohistochemical Study ◽  
Orthodontic Tooth Movement
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