Immediate laser-induced hemostasis in anticoagulated rats subjected to oral soft tissue surgery: a double-blind study

The features of the reparative regeneration of an oral mucosa wound created under the exposure of a laser at a wavelength of 445 nm (a pilot study)

In clinical practice, an innovative laser technology that provides contactless preparation of soft tissues with a wavelength of 445 nm has been introduced. This study aimed to investigate the morphological changes in the oral mucosa when exposed to laser radiation at a wavelength of 445 nm in the ablation mode.An experimental study was conducted to analyze the dynamics of reparative regeneration in the wound caused by that particular type of radiation, utilizing the procedure of lower lip frenuloplasty as an illustration. 48 sexually mature male laboratory rats were chosen as the research object. The procedure of preparing the oral vestibule was executed by employing a contactless laser beam with a wavelength of 445 nm and a power of 0.7 W in continuous mode (CW) and an uninitiated fiber.Histological examination showed that 25 min after the surgery, there were large areas of coagulation necrosis in the oral mucosa in the area affected by the blue laser. In 48 h, the area of necrosis decreased both in size and depth. By the 7th day after the surgery, the necrotic masses had grown into the connective tissue, while marginal regeneration of the epithelium was noted. By the 14th day, the wound surface was completely epithelialized, represented by fibrous scar tissue. Clinically, around the mandibular incisors, there was a wide area of attached keratinized gingiva.The findings of histological examination indicate a necrosis of coagulation type in the region of tissue ablation and also show the absence of phase II of the inflammatory response (the stage of exudation), which expedites the process of epithelialization of the oral mucosa wound.

Gingivectomy with high-power laser for correction of the gummy smile resulting from altered passive eruption-a case series

To compare the efficacy between the surgical techniques of gingivectomy with high-power laser (HPL) and conventional gingivectomy for correction of a gummy smile (GS) due to altered passive eruption (APE). This was a case series of six female patients diagnosed with GS associated with APE. For the conventional gingivectomy procedure and for the one using the diode laser (808 nm, 2 W, in continuous mode), the six upper anterior teeth were divided into two groups (control (CG)-# 11, # 12, # 13, and test (TG)-# 21, # 22, # 23). Analyses of intraoperative bleeding and levels of pain and postoperative tissue repair were performed. The thermal pattern analysis was performed using infrared thermography. The level of significance was set at p < 0.05. There was no intraoperative bleeding in the TGs (p = 0.002). The CG showed tissue repair significantly better than the TG on the 14th postoperative day (p = 0.004). There were no statistically significant differences regarding the level of postoperative pain between the groups (p > 0.05). Regarding the thermographic analysis, there were also no statistically significant differences (p > 0.05). HPL gingivectomy was more effective, regarding the absence of intraoperative bleeding, while the conventional technique promoted better tissue repair. No significant differences were observed in the other parameters, possibly due to the minimal damage caused by gingivectomy, with either HPL or the conventional procedure, as there was no removal of bone tissue.

Delayed Hemorrhage Following Laser Frenotomy Leading to Hypovolemic Shock

Ankyloglossia is a failure of the tongue to release from the oral floor with reported consequences that include breastfeeding difficulties and speech impediments. Frenotomy is a commonly performed procedure for the treatment of ankyloglossia. Laser (light amplification by stimulated emission of radiation) is one of several mediums used to perform frenotomies. Although most frenotomies are uncomplicated, there remains a small possibility of complication, such as infection, pain, ductal injury, and hemorrhage, even in expert hands. Because frenotomies are most often performed in infants, postoperative hemorrhage is an important complication to look for as even small amount of bleed may prove fatal, due to low blood volume reserve. We report a case of delayed hemorrhage after laser frenotomy in a 6-week old infant displaying shock symptoms and required fluid resuscitation.

In Vivo Investigation of Noncontact Rapid Photothermal Hemostasis on Venous and Arterial Bleeding

OBJECTIVE

Endoscopic surgical procedures rigorously underscore the significance of rapid hemostasis for unavoidable intraoperative bleeding, requiring advancement of the immediate hemostatic interventions for favorable clinical outcomes. Here, we report the efficacy of a new optical treatment with dual-wavelengths to develop an endoscopic hemostasis method.

METHODS

we combine visible (20-W 532 nm at 1.1 kW/cm²) and near-infrared (40-W 980 nm at 2.2 kW/cm²) wavelengths for facilitating noncontact thermal hemostasis on venous and arterial bleeders in in vivo leporine models.

RESULTS

Simultaneous irradiation of 60-W dual-wavelengths allows for an increased irradiance of 3.3 kW/cm², involving both rapid light absorption by hemoglobin and deep thermal penetration. The collective thermal effects from the combined wavelengths contribute to a significant reduction in coagulation time and a high success rate of complete hemostasis for both venous and arterial bleeders. The enhanced hemostatic potential of the dual-wavelengths treatment accompanies minimal hemorrhage, reduces inflammatory responses, and facilitates re-epithelialization.

CONCLUSION

The proposed dual-wavelengths method can achieve rapid and complete hemostasis for endoscopic procedures.

SIGNIFICANCE

We present the high-irradiance photothermal treatment using the dual-wavelengths as a novel method to regulate venous and arterial bleeding and potentially as a rapid noncontact hemostasis option to mitigate the risk associated with significant blood loss.

Efficacy of laser myringotomy compared with incisional myringotomy for the treatment of otitis media with effusion in pediatric patients: A systematic review

BACKGROUND

Recent reports have shown that laser myringotomy (LM) is increasingly used to treat otitis media with effusion (OME), with higher effectiveness, fewer complications, and lower recurrence rate.

OBJECTIVE

A systematic review of the published literature was conducted to assess the efficacy of LM compared with incisional myringotomy (IM) with or without tympanostomy ventilation tube (VT) for the surgical treatment of OME in pediatric patients (age ≤ 18 years).

METHODS

We searched the PubMed, Web of Science, Ovid, VIP Chinese, China National Knowledge Infrastructure (CNKI), and Wanfang Chinese databases for articles published before Nov 20, 2018. All relevant articles were reviewed and selectively collected according to inclusion and exclusion criteria. The quality of the included studies was assessed. The data in the eligible studies were extracted and analyzed.

RESULTS

A total of 8 studies, including 698 patients and 1262 ears, were included. The types of studies examined include randomized controlled trials (RCTs) and case-control studies of varying quality. The outcomes and complications of LM and IM with or without VT were charted and compared. No quantitative meta-analysis could be performed.

CONCLUSIONS

LM, characterized by much higher recurrence of OME and less complications, is less effective than IM+VT in keeping the middle ear ventilated and relieving middle ear effusion, but more effective than IM alone. The different interventions seem to show no significant differences in hearing improvement. Nevertheless, additional high-quality research is needed to perform more advanced analyses and to confirm and update our results and conclusions.