## 3 Discussion  
Many authors have extensively investigated the surgical disinclusion approach with a cold blade in the absence of orthodontic traction. [PERSON] et al. used this technique in  
Figure 6: Measurements of the distance between the occlusal plane and the canine cusps at T0 in mm. (F_2-1: cusp of 2.3; F_1-1 cusp of 1.3; L_1: measurement of the left canine; L: measurement of the right canine). Figure 7: Measurements of the distance between the occlusal plane and the canine cusps at T0 in mm. (F_4-1: cusp of 2.3; F_3-1 cusp of 1.3; L_2: measurement of the left canine; L: measurement of the right canine). their study and reported that it facilitates the spontaneous eruption of palatally impacted canines. They reported that within six to eight months, the canine crown naturally emerges into the palate without the need for fixed or removable orthodontic devices. Typically, the crown erupts at a distance from the roots of the central and lateral incisors, moving toward the center of the palate [25]. It was therefore decided to use this surgical protocol in this case report. In addition, there are several studies demonstrating the biostimulation effects of a low-intensity laser (PBMT), which results in speeding up tooth movement when applied in the orthodontic field. Photobiomodulation therapy modulates the inflammatory response in periodontal tissues, boosts collagen production, and encourages the growth of osteoblasts and osteoclasts. These effects support bone remodeling via the RANKL/RANK/osteoproteger signaling pathway, thereby contributing to a faster rate of orthodontic tooth movement. Research indicates that laser light promotes the proliferation of osteoclasts, osteoblasts, and fibroblasts, thereby influencing bone remodeling and accelerating tooth movement [26; 27; 28]. Despite the well-documented ability of low-level laser therapy to stimulate orthodontic tooth movement, its stimulation effect on impacted teeth movement--particularly palatally impacted maxillary canines--has not yet been thoroughly explored. The objective of this study was to evaluate potential differences in eruption rate and extent between the element 2.3 treated with photobiomodulation therapy (PBMT) and the untreated element 1.3 in order to investigate the effects of PBMT on tooth eruption. At the end of the monitoring time of 16 weeks, at T4, the inclusion height of element 1.3 was 7.00 mm and of element 2.3 was 3.76 mm. This means that the canines erupted to an extent of 0.21 mm and 3.16 mm, respectively. The difference in eruption between the PBMT-treated element and the non-irradiated element is therefore evident. In addition, element 1.3, undergoing overculectomy with a cold blade, erupted poorly in comparison to that reported by [PERSON], suggesting the possible influence of other factors on the response of the canine after surgery. It is important to consider that various factors may influence the differential eruptive response between the two sides, particularly the initial position, depth, and angulation of the impacted canines. However, by employing a split-mouth study design, it was possible to compare two elements within the same subject, thereby eliminating interindividual variability--one of the most unpredictable factors in clinical outcomes. The results suggest a positive effect of low-intensity laser application on the autonomous eruption of impacted canines toward the occlusal plane following conventional surgical exposure. Unlike the traditional approach, which typically requires surgical exposure followed by mechanical orthodontic traction, PBMT could have the potential to biologically stimulate the eruption process without the need for physical force application. The combined use of surgery and PBMT may offer several advantages. First, it can significantly reduce overall treatment time by accelerating the natural eruptive movement, as PBMT has been shown to stimulate cellular activity in the periodontal ligament, increase vascularization, and enhance bone remodeling.