Efficacy and safety of diode laser during circumvestibular incision for Le Fort I osteotomy in orthognathic surgery: a triple-blind randomized clinical trial

Low-dose tranexamic acid in orthognathic surgery: two-dose protocol-a double-blind randomized controlled trial on oedema, bleeding, and visibility of the surgical field

The aim of this double-blind randomized controlled trial was to evaluate the effects of a two-dose tranexamic acid (TXA) protocol on oedema, bleeding, and surgical field visibility during orthognathic surgery. 72 patients participated and were assigned to three groups: the TXA250 group received a single intravenous dose of 250 mg TXA prior to incision; the TXA500 group received 250 mg TXA before incision and 250 mg after the first jaw surgery was completed; the control group received no TXA. Oedema was measured preoperatively and on postoperative days 1, 3, and 7. Sixty-four patients completed the study. Bleeding was significantly higher and Fromme scale scores for surgical field visibility were significantly lower in the control group compared to the TXA groups (all P < 0.001). The TXA500 group demonstrated significantly reduced oedema compared to the control group (day 3: P = 0.037, day 7: P = 0.002), while the comparison of the TXA250 and control groups showed no significant difference. However, there was no significant difference in oedema between the two TXA groups. Hence, no firm conclusions can be drawn about the superiority of two-dose TXA over the single dose; this needs further investigation in a future study.

Tissue response to different incision tools in animal model

PURPOSE

The aim of this study is to compare the repair of incisions performed with microdissection electrocautery tip, conventional electrocautery tip, high potency diode laser, and conventional scalpel blade in a in vivo model.

METHODS

Different incisions were performed in adults Holtzman rats using the four types of instruments: microdissection electrocautery tip, conventional electrocautery tip, high potency diode laser, and conventional scalpel blade, in different periods of healing process. Thirty rats were divided into 5 groups, according to the period of euthanasia-24 h, 48 h, 72 h, 7 days, and 14 days. All animals received four incisions, each by a different method. Quantitative histological and histomorphometric analyses were performed using hematoxylin and eosin (HE) and Picrosirius Red staining.

RESULTS

Inflammatory profile and tissue repair presented small statistically significance differences comparing conventional scalpel blade and microdissection tip; moreover, both presented quantitatively superior to the others.

CONCLUSION

It is believed that the microdissection tip can perform a dynamic incision just as a common scalpel blade, but more effective. Furthermore, it can promote a better hemostatic control of the surgical field that is comparable to conventional electrocautery tip without affecting tissue repair.

Latest Evidence on Orthognathic Surgery Techniques and Potential Changes in Oral Microbiota related to Intermaxillary Fixation in Orthodontic Patients: A Systematic Review

Background:

Orthognathic surgery is often applied for the correction of facial dysmorphia, and different findings were highlighted regarding the techniques applied. After surgical treatment, intermaxillary fixation is placed, which compromises oral hygiene and, consequently, can lead to increased plaque accumulation and microbiological changes, promoting the proliferation of periodontopathogenic bacteria. Therefore, the aims of the present review are to describe the main evidence from the last 20 years of clinical studies concerning surgical techniques applied to orthognathic surgery and, finally, to analyze potential changes in the oral microbiota.

Materials and Methods:

An electronic search was conducted in the PubMed (MEDLINE) and Scopus databases; the MeSH (Medical Subject Heading) terms are bacteria, dental plaque, evidence-based practice, maxillomandibular fixation, microbiota, operative procedures, and orthognathic surgery.

Results:

At the end of the search process, 31 relevant articles were finally included and analyzed in this systematic review, which has a low risk of bias. Clinical studies on humans have been considered in this review. Based on the studies included it would be preferable to use piezoelectric technology in osteotomies because of its many advantages, “surgery-first” technique allows for results comparable to the standard technique in Class III malocclusions while improving quality of life more rapidly, the “mandible-first” technique seems to have more advantages than the “maxilla-first” technique, Computer-Aided Design and Manufacturing (CAD/CAM) could provide more accurate and precise results, and finally, Laser can be applied with different advantages. Regarding intermaxillary fixation, no long-term increase in the concentration of periodontal bacteria was recorded.

Conclusion:

Several findings still need to be confirmed with reference to the best suturing technique to reconstitute the nasal wing base, the real effectiveness of “surgery-first,” “maxilla-first,” and “mandible-first” approaches in patients with Class III malocclusion, the use of CAD/CAM and Laser, more studies should be conducted to evaluate quantitative and qualitative changes in other microorganisms following intermaxillary fixation.

Effects of Photobiomodulation Using Low-Level Laser Therapy on Alveolar Bone Repair

Alveolar bone repair is a complex and extremely important process, so that functions such as the mastication, occlusion and osseointegration of implants can be properly reestablished. Therefore, in order to optimize this process, many procedures have been used, such as grafting with biomaterials and the application of platelet-rich fibrin (PRF). Another method that has been studied is the use of photobiomodulation (PBM) with the use of low-level laser therapy (LLLT), which, through the absorption of photons by the tissue, triggers photochemical mechanisms in the cells so that they start to act in the search for homeostasis of the affected region. Therefore, the objective of this review was to analyze the use of LLLT as a possible auxiliary tool in the alveolar bone repair process. A search was carried out in scientific databases (PubMed/MEDLINE, Web of Science, Scopus and Cochrane) regarding the following descriptors: “low-level laser therapy AND alveolar bone repair” and “photobiomodulation AND alveolar bone repair”. Eighteen studies were selected for detailed analysis, after excluding duplicates and articles that did not meet predetermined inclusion or non-inclusion criteria. According to the studies, it has been seen that LLLT promotes the acceleration of alveolar repair due to the stimulation of ATP production, activation of transcription and growth factors, attenuation of the inflammatory process and induction of angiogenesis. These factors depend on the laser application protocol, and the Gallium Aluminum Arsenide—GaAlAs laser, with a wavelength of 830 nm, was the most used and, when applications of different energy densities were compared, the highest dosages showed themselves to be more efficient. Thus, it was possible to conclude that PBM with LLLT has beneficial effects on the alveolar bone repair process due to its ability to reduce pain, the inflammatory process, induce vascular sprouting and, consequently, accelerate the formation of a new bone matrix, favoring the maintenance or increase in height and/or thickness of the alveolar bone ridge.

Perioperative therapies to reduce edema after orthognathic surgery: a systematic review and meta-analysis

Objective To systematically review the literature and assess the effectiveness of perioperative systemic and nonsystemic therapies in reducing edema after orthognathic surgery. Study Design Four databases (PubMed, Web of Science, Bireme, and Scopus) were searched. Only randomized clinical trials were included and assessed using the RoB 2.0 software (Cochrane Collaboration, London, UK). Studies were grouped into time of assessment and systemic/nonsystemic therapy. Results Eighteen studies were included in this review (8 in the meta-analysis, n = 349). The qualitative assessment of systemic (enzyme therapy, dexamethasone, betamethasone, and Venoplant) and nonsystemic therapies (thermotherapy and K-Taping) appear to reduce edema. Manual lymphatic drainage (MLD) after 72 hours (CI: -1.03 to 2.31; P = .45), and 30 days (CI: -1.53 to 0.49; P = .49), and laser after 24 hours (CI: -1.36 to 1.48; P = .93), 72 hours (CI: -4.81 to 2.92; P = .63), 30 days (CI: -3.44 to 0.99; P = .28), and 90 days (CI: -1.83 to 0.96; P = .54) showed no significance. Thermotherapy reduced edema after 48 hours (CI: -48.47 to -13.31; P = .0006) and 30 days (CI: -14.73 to -1.98; P = .01). Conclusion The Grading of Recommendations, Assessment, Development and Evaluations tool showed moderate evidence for thermotherapy (significant reduction of edema), whereas the MLD and laser results were rated as high certainty of evidence (no reduction of edema).

Systematic mapping review of orthognathic surgery

STUDY DESIGN

Systematic mapping review AIM AND SCOPE: The objective of this mapping review was to identify, describe, and organize clinical research currently available from systematic reviews and primary studies regarding co-interventions and different surgical modalities used in orthognathic surgery (OS) and their outcomes.

METHODS

Systematic reviews (SRs), randomized controlled trials, and observational studies that evaluated perioperative OS co-interventions and surgical modalities were identified in an exhaustive search of MEDLINE, EMBASE, Epistemonikos, Lilacs, Web of Science, and CENTRAL. Grey literature was also screened.

RESULTS

Included were 35 SRs and 253 primary studies, 103 from SRs, and another 150 identified in our search. Overall, SR quality was rated as critically low, with only two SRs rated as of high quality. 19 questions on population, interventions, comparisons, and outcomes (PICO) extracted from the SRs focused on osteosynthesis methods, surgical cutting devices, and use of antibiotics, corticosteroids, and induced hypotension. Also identified were 15 research gaps. Evidence bubble maps were created to graphically depict the available evidence.

CONCLUSION

Future high-quality research, both primary and secondary, is needed to address the knowledge gaps identified in this systematic mapping review.