Modern orthodontics constantly strives to improve treatment methods aimed at accelerating tooth movement and increasing patient comfort. Relatively recently, three innovative approaches to this task have been introduced: vibrational, ultrasonic, and light-based. Active work is currently underway on their commercialization, and new scientific data confirming the effectiveness of the proposed methods are expected.
The vibrational system AcceleDent (OrthoAccel Technologies, Inc.) represents a new generation of devices, differing from earlier apparatuses for generating piezoelectric currents. Its principle of operation is based on applying high-frequency vibration (30 Hz) to the tooth for approximately 20 minutes daily (see Fig. 1).
Principle of operation: vibration stimulates the processes of cell differentiation and maturation, accelerating the bone remodeling necessary for tooth movement. Essentially, this mimics the effect of a local, but more gentle, intervention than, for example, corticotomy or bone perforation, promoting the natural process of bone tissue restoration.
Clinical advantages: in addition to reducing treatment duration, research indicates that vibrational stimulation can reduce pain sensations associated with orthodontic intervention. The presumed mechanism of the analgesic effect is associated with the activation of endogenous opioid systems under the influence of vibration. Many patients report increased comfort when using AcceleDent.
Treatment protocol: the standard recommendation is to use AcceleDent for approximately 20 minutes per day. However, the duration and frequency of use can be adjusted by the treating orthodontist, based on the individual needs of the patient and the complexity of the clinical case. It is important to understand that AcceleDent is a supplement to traditional orthodontic treatment, not a replacement for braces or aligners.
Safety: conducted clinical trials have not revealed significant side effects from the use of AcceleDent. Nevertheless, as with any medical intervention, it is important to consider individual contraindications and be sure to consult with a doctor.
Additional research: although initial studies have demonstrated positive results, further large-scale studies involving a large number of patients and a longer observation period are necessary to fully confirm the long-term efficacy and safety of AcceleDent in diverse clinical scenarios. Meta-analyses of several studies can also provide a more reliable assessment of the method’s effectiveness.
Financial aspect: it should be taken into account that the use of the AcceleDent device entails additional expenses, increasing the overall cost of orthodontic treatment.
Scientific evidence: A parallel, double-blind, prospective, randomized, controlled trial was conducted in Houston involving 45 patients, aiming to evaluate the effect of low-level cyclic loading on the rate of tooth movement. Patients were randomly divided into two groups: an experimental group (23 subjects) receiving vibrational stimulation with AcceleDent (0.25 N, 30 Hz, 20 min/day), and a control group (22 subjects) where the device was not activated. Analysis of the mean monthly retraction rate of the maxillary canine showed a statistically significant advantage for the AcceleDent group: 1.16 mm/month (95% CI: 0.86–1.46) compared to 0.79 mm/month (95% CI: 0.49–1.09) in the control group, with a difference of 0.37 mm/month (p = 0.05). These results confirmed that low-level cyclic loading at a frequency of 30 Hz and a force of 0.25 N increases the rate of tooth movement when used as a supplement to orthodontic treatment.
The biological explanation is associated with the stimulation of bone formation, reduction of osteoclast activity, and enhancement of osteogenesis.
Exposing the alveolar process to ultrasound during orthodontic treatment also implies a modification of biological processes, which may contribute to a reduction in root resorption and an acceleration of tooth movement (see Fig. 2).
Therapeutic ultrasound, which is distinct from diagnostic ultrasound, is known for its ability to enhance local blood flow. Theoretically, this could prevent the formation of hyaline areas in the periodontium, minimize root resorption, and consequently, accelerate bone remodeling and the actual tooth movement.
Mechanism of action: ultrasonic stimulation is presumed to accelerate tooth movement by enhancing the activity of cells involved in bone tissue remodeling, as well as by stimulating angiogenesis (the formation of new blood vessels), which leads to improved blood supply and nutrition of periodontal tissues.
Types of devices: various ultrasonic devices are used in orthodontics, including those for low-intensity pulsed ultrasound therapy (LIPUS). LIPUS therapy involves the use of low-intensity ultrasonic waves that exert a biostimulatory effect on tissues.
Clinical studies: the results of clinical studies on the effectiveness of ultrasonic stimulation in orthodontics are mixed. Some studies indicate an acceleration of tooth movement under the influence of LIPUS, while others have not found significant differences. Further studies with a more rigorous design are required to establish the effectiveness and determine the optimal parameters of ultrasonic stimulation.
Safety: in general, LIPUS therapy is considered safe when the recommended parameters are followed. However, potential risks must be considered, such as tissue overheating and nerve damage, especially when using high-intensity ultrasound.
Practical example: in a retrospective clinical study approved by the Ethics Board of the University of Alberta, data from 34 patients undergoing orthodontic treatment using the LIPUS device in conjunction with Invisalign clear aligners were analyzed. The LIPUS parameters included a frequency of 1.5 MHz, a pulse duration of 200 µs, a pulse repetition rate of 1 kHz, and an intensity of 30 mW/cm², applied daily for 20 minutes. The LIPUS group (20 minutes/day) showed a significantly shorter treatment duration (541.44 ± 192.23 days) compared to the control group (1061.05 ± 455.64 days), representing an average 49% reduction in total treatment time.
At the end of 2010, a patent was filed in the field of phototherapeutic acceleration of tooth movement, and this method is currently undergoing clinical trials. The Biolux device is based on the use of light with a wavelength of 800-850 nm (near-infrared range). Although a large portion of the light energy (about 97%) is lost when passing through soft tissues, the remaining 3%, reaching the bone tissue, can activate intracellular enzymes and increase the activity of periodontal and bone cells, thereby potentially accelerating bone remodeling and tooth movement (see Fig. 3). Phototherapy can also enhance blood flow, which also positively affects the tooth movement process. An important feature of the Biolux device is the ability to customize the light exposure to specific areas of the dental arch (frontal, chewing, or the entire arch), which may improve anchorage control.
Mechanism of action (photobiomodulation): light stimulation, or photobiomodulation (PBM), uses low-intensity light (red or near-infrared) to activate cellular activity. It is presumed that PBM increases the production of ATP (the energy substrate of cells), improves microcirculation, and reduces inflammation, which collectively contributes to the acceleration of bone remodeling and tooth movement.
Types of light devices: various devices are used, including LED (light-emitting diode) and laser systems. It is important that the devices used for PBM have the appropriate wavelength, power, and exposure time to achieve the optimal therapeutic effect.
Clinical studies: studies on photobiomodulation in orthodontics show promising results: acceleration of tooth movement, reduction of pain, and improvement in the stability of outcomes are reported. However, as with other new methods, further controlled studies are required to confirm these data and determine the optimal PBM parameters for various clinical situations.
Safety: PBM is generally considered a safe method when using low-intensity light sources. It is necessary to exercise caution to avoid direct exposure of light to the eyes and to consider possible contraindications, such as photosensitivity.
Practical results: a study involving 19 patients, divided into a phototherapy group (n=11) and a control group (n=8), showed that the daily use of the intraoral LED device OrthoPulse™ (Biolux Research Ltd.) significantly reduced the time for tooth alignment. The phototherapy group achieved alignment in 48 days (SD 39) compared to 104 days (SD 55) in the control group (p = 0.0053). Thus, intraoral photobiomodulation increased the average rate of tooth movement by 2.9 times, reducing the alignment duration by an average of 54%.
Animal studies: the potential biological mechanisms of low-energy laser irradiation on orthodontic tooth movement have been studied in animal experiments. The data indicate stimulation of alveolar bone remodeling, activation of matrix metalloproteinases, expression of cathepsin K and integrin, activation of the RANK/RANKL system, as well as stimulation of fibronectin and type I collagen expression, confirming their role in accelerating bone tissue restructuring.
Individual variability: the effectiveness of any of these methods can vary depending on individual patient characteristics such as age, bone tissue condition, metabolism, and the complexity of the clinical case.
Integration with traditional treatment: all three methods are considered exclusively as supplements to standard orthodontic approaches, not as a replacement for them.
Ethical considerations: it is extremely important for orthodontists to provide patients with complete and objective information about the potential benefits, risks, and cost of each method. This enables patients to make fully informed decisions regarding their treatment.
Vibrational, ultrasonic, and light-based methods open new prospects for accelerating orthodontic treatment. However, further scientific research is necessary to reliably confirm their efficacy, safety, and to determine the optimal parameters for application. The implementation of these technologies should be approached with due caution, considering them as auxiliary tools within the framework of traditional orthodontic therapy.
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