Method Article
This article describes two protocols: 1) adjunctive diode laser therapy for treating periodontitis and 2) probiotic Lactobacillus therapy for treating peri-implant disease, with emphasis on the laser usage mode (inside or outside pocket), laser application regimen (single or multiple sessions), and a probiotic protocol of professional and home administration.
Periodontal and peri-implant diseases are plaque-induced infections with a high prevalence, seriously impairing people's quality of life. The diode laser has long been recommended as adjunctive therapy in treating periodontitis. However, the optimal combination of usage mode (inside or outside periodontal pocket) and application regimen (single or multiple sessions of appointment) has not been described in detail. Meanwhile, probiotic Lactobacillus is regarded as a potential adjuvant in the management of the peri-implant disease. Nonetheless, a detailed protocol for an effective probiotic application is lacking. This article aims to summarize two clinical protocols. For periodontitis, the optimal collaboration of laser usage mode and application regimen was identified. Regarding peri-implant mucositis, a combined therapy containing professional topical use and home administration of probiotic Lactobacillus was established. This updated laser protocol clarifies the relationship between the treatment mode (inside or outside the periodontal pocket) and the number of laser appointments, further refining the existing diode laser therapy. For inside pocket irradiation, a single session of laser treatment is suggested whereas, for outside pocket irradiation, multiple sessions of laser treatment provide better effects. The improved probiotic Lactobacillus therapy resulted in the disappearance of swelling of the peri-implant mucosa, a reduced bleeding on probing (BOP), and an obvious reduction and good control of plaque and pigmentation; however, probing pocket depth (PPD) had limited improvement. The current protocol should be regarded as preliminary and could be further enhanced.
Periodontal disease is a chronic multifactorial infection resulting in progressive destruction of periodontium1. Its severe form, periodontitis, affects up to 50% population worldwide2 and is regarded as a major cause of tooth loss in adults3. Replacement of missing teeth with dental implants has been extensively favored over traditional options4. The implants show prominent functional and aesthetic performances with a long-term survival rate of 96.1% after 10 years5,6. The implants, however, can suffer from peri-implant disease leading to mucosal inflammation (peri-implant mucositis) or surrounding bone loss (peri-implantitis)7, which may cause the implant failure8. Therefore, it is of utmost necessity to manage the periodontal and peri-implant diseases effectively, in order to preserve natural teeth or improve the survival rate of dental implants.
Periodontal and peri-implant diseases share similar etiology9, i.e., both are initiated by exposure to dental plaque, consisting mainly of anaerobic and microaerophilic bacteria10. Mechanical debridement is considered a reliable modality to achieve efficient disruption of pathogenic deposits on root or implant surfaces11. Nevertheless, it has restricted accessibility using instruments when there is complex tooth anatomy (i.e., root furcation and groove), leading to insufficient decontamination12. Under this context, the application of lasers and probiotics has emerged to supplement mechanical debridement13,14.
A variety of lasers have been proposed for periodontal treatment, such as Nd:YAG; CO2; Er:YAG; Er,Cr:YSGG; and diode laser15. Among these, the diode laser is the most popular choice for clinical treatment due to its portability and low cost16. The diode laser has been recommended as an ideal adjunct in destroying biofilms, eliminating inflammation, and facilitating wound healing due to its photobiomodulation and photothermal effects12,13. The diversity of laser usages, nonetheless, leads to significant clinical heterogeneity among current studies. Thus, in our recent publication, we evaluated 30 clinical trials and summarized the optimal combination of laser usage mode and application regimen12. However, few studies report the detailed procedure of the combination protocol. On the other hand, probiotic Lactobacillus has been drawing increasing attention as a potential adjuvant in treating peri-implant disease, due to its antimicrobial and anti-inflammatory performances17,18. The clinical benefits, however, have not reached an agreeable consensus. One critical account referred to the variety of probiotic administration protocols17.
Based on the current evidence, this article describes two modified clinical protocols: the existing protocol for the use of adjunctive diode laser in treating periodontitis is improved based on two laser usage modes (inside or outside pocket) and two application regimens (single or multiple sessions of appointment)12. For the adjunctive probiotic Lactobacillus therapy in treating peri-implant disease, a combination of professional local use and home administration of probiotic is described17.
This study was approved by the Institutional Review Board of the College of Stomatology, Xi'an Jiaotong University (xjkqll[2022]NO.034). Informed consent was available from the patients involved in this study.
1. Adjunctive diode laser therapy in the non-surgical treatment of periodontitis
2. Adjunctive probiotic therapy in the nonsurgical treatment of peri-implant mucositis (Figure 4A)
Periodontal pockets with PPD ≥ 5 mm require laser irradiation after SRP, as it is difficult to obtain complete debridement by SRP alone (Figure 1A,B). After SRP, if the periodontal pockets bleed profusely and clot on the tooth surface, the operator needs to stop the bleeding and remove the clot by rinsing and gargling several times. This is because a large amount of blood will prevent the laser from working (Figure 1C,D).
The exposed fiber tip is calibrated to be 1 mm less than the measured PPD. Laser parameters were set at 1 W, using continuous wave (Figure 2B). For the recommended laser parameters, one should refer to the manufacturer's guidelines and adjust the parameters appropriately for different clinical scenarios. The fiber tip was 5 mm away from the gingival surface and directed at an angle of 90° (Figure 3B).
The fully ground probiotic powder has no lumpy particles (Figure 4C). Dissolving it in saline (1:3) results in a green solution (Figure 4D).
Compared to pre-operation (Figure 5A,C), diode laser-assisted SRP therapy (inside or outside mode) effectively removed pathogenic plaque biofilm and eliminated inflammation in patients with periodontitis, achieving significant improvements (i.e., with regards to erythema, swelling, PPD, BOP) (Figure 5B,D). Compared to pre-operation (Figure 5E), probiotic therapy resulted in the disappearance of swelling of the peri-implant mucosa, reduced BOP, and an obvious reduction and good control of plaque and pigmentation; however, there was no significant change in PPD (Figure 5F).
Figure 1: SRP for periodontitis. (A) A periodontal pocket with PPD = 5 mm. (B) PPD numbers of the tested tooth (mm). SRP is performed for the pocket with PPD ≥ 4mm, and an adjunctive diode laser treatment is conducted for the pocket with PPD ≥ 5 mm. (C) SRP with ultrasound instruments. (D) SRP with hand-held instruments. B: buccal; L: lingual; SRP: scaling and root planing. Please click here to view a larger version of this figure.
Figure 2: Adjunctive laser therapy inside the periodontal pocket. (A) Phases of the laser treatment with inside mode. (B) Calibration of fiber tip exposed (4 mm) to measure 1 mm less than PPD (5 mm). The fiber tip with a diameter of 300 µm is inserted into the periodontal pocket (1 mm shorter than the measured PPD). (C) The fiber tip is swept in the pocket in mesial-distal and apical-coronal directions (the green curve indicates the path of the fiber tip). Please click here to view a larger version of this figure.
Figure 3: Adjunctive laser therapy outside the periodontal pocket. (A) Phases of the laser treatment with outside mode. (B) The fiber tip irradiates the pocket at a 5 mm distance away from the gingival surface. (C) The distance between the fiber tip and gingival surface ranges from 2-10 mm, and the tip is directed at an angle of 90°. Please click here to view a larger version of this figure.
Figure 4: Supragingival scaling and adjunctive probiotic Lactobacillus therapy. (A) Phases of the probiotic Lactobacillus therapy. (B) A titanium ultrasound tip is used to perform supragingival scaling for mucositis implants. (C) The probiotic powder. (D) The probiotic solution with a green color. (E) The probiotic solution is delivered into the peri-implant sulcus with a blunted and soft tip. Please click here to view a larger version of this figure.
Figure 5: Clinical examination before and 1 month after treatment. (A) One month after laser treatment in the inside usage mode, gingival erythema and swelling disappeared, and PPD and BOP were greatly reduced compared to the (B) pre-operation condition. (C) One month after laser treatment in the outside usage mode, gingival erythema and swelling improved, and PPD and BOP reduced as compared with the (D) pre-operation condition. (E) After 1 month of probiotic therapy, peri-implant mucosal swelling disappeared, pigmentation and plaque were reduced and well-controlled, and BOP was reduced as compared with the (F) pre-operation condition; however, there was no significant change in PPD relative to the pre-operation condition (F). Please click here to view a larger version of this figure.
Supplementary File 1: Periodontal chart. B: buccal; BOP: bleeding on probing; CAL: clinical attachment loss; L: lingual; PI: plaque index; PPD: probing pocket depth. Please click here to download this File.
Supplementary File 2: Characteristics of studies referring to adjunctive laser therapy. Please click here to download this File.
Supplementary File 3: Characteristics of studies referring to adjunctive probiotic Lactobacillus therapy. Please click here to download this File.
Although diode laser has been widely utilized in periodontal therapy, the clinical effectiveness remains controversial among current clinical trials15,20. As demonstrated, the laser usage mode and application regimen have significant impacts on the efficacy of periodontal laser therapy12. Most researchers, however, ignore the potential role, eliciting results that are hard to explain. Under different usage modes, excessive or insufficient laser action can lead to negative result21. Only with an optimal combination of usage mode and application regimen can the laser maximize its therapeutic benefits12. There seems to be an urgent need to improve the existing protocol for diode laser therapy. Therefore, in this article, two periodontal laser usage modes (inside pocket or outside pocket) are described in view of the photobiomodulation and photothermal effects. Furthermore, based on published randomized controlled trials, the suggested number of laser appointment sessions under the two usage modes was proposed; for inside pocket use, a single session of laser application is suggested whereas, for outside pocket use, multiple (3-5) sessions of laser application provide a better clinical effect.
It is important to note that laser parameters also affect laser efficacy. Common periodontal laser parameters relate to wavelength, energy density, and output power22. Most studies used diode lasers with 808-980 nm wavelength and reported good clinical results23. The range of 600-1,100 nm diode laser was confirmed to penetrate deep into the tissue, acting on the epithelial and connective tissues of the gingiva20. The energy density ranged from 1.6-24.84 J/cm2 (inside mode) and 3-10 J/cm2 (outside mode). It was reported that lasers with a density of 1.5-16 J/cm2 had good anti-inflammatory properties24. The output power was reported to range between 0.5-2.5 W for the inside application, while it was much lower (0.01-0.5 W) for the outside use. Given that the recommended parameters vary in part among different laser manufacturers, improperly increasing the laser power may cause thermal damage to the periodontal tissues during inside-pocket sweeping25,26. It is strongly recommended to consult the laser manufacturer and determine the appropriate parameters before use. In this protocol, a safe power level of 1 W was chosen for the inside mode.
Considering that probiotic Lactobacillus administration gives reliable results in the management of gingivitis and periodontitis, it is expected to exert similar therapeutic benefits in peri-implant disease. Nevertheless, the limited number of studies makes it difficult to evaluate the effectiveness of probiotic Lactobacillus17,27, especially for the advanced form of the disease, peri-implantitis17,28,29. Thus, the probiotic administration protocol was offered only for patients with peri-implant mucositis. Given the obvious clinical diversity in the published studies, it is crucial to establish a rational protocol with reproducible effect. As a result, we systematically reviewed related studies and suggested a refined protocol, including a combination of professional topical use and home administration of probiotic Lactobacillus and enhancing the OHI.
According to the authors' experience, when choosing the inside pocket mode of laser therapy, it is critical to achieve gentle insertion and continuous movement of the fiber tip. Heavy or deep insertion of the fiber will cause periodontal bleeding, which can weaken the laser effect. Hence, the insertion depth is suggested to be 1 mm shorter than the measured PPD. Prolonged action of a particular site in the pocket can cause excessive photothermal effects (over 10 °C), leading to periodontal pain and even permanent damage to the periodontal ligament and bone30. During this session, the operator should check the fiber tip regularly. Once a blood clot is attached to the tip, it needs to be wiped off with a cotton ball moistened with 75% alcohol to avoid impeding the laser action. Regarding the professional use of probiotic therapy, the concentration of the probiotic solution should not be too high; otherwise, it will easily block the injection needle.
As a modified protocol for existing studies, the probiotic therapy in this paper aims to reduce clinical heterogeneity and contribute to the implementation of future clinical studies in this field. The current result showed that probiotic Lactobacillus therapy led to the disappearance of the peri-implant mucosal swelling, reduced BOP, and obvious reduction and excellent control of plaque and pigmentation after a 1-month follow-up. This demonstrated the effectiveness of probiotics in controlling peri-implant mucosal inflammation. However, PPD improvement was limited. As peri-implant mucositis does not cause bone loss, it only presents as mucosal erythema, swelling, or bleeding, and there is usually no deep peri-implant pocket31. The patient, in this case, had only mild swelling of the mucosa prior to treatment, and therefore, the pre- and post-operative changes in PPD were not significant. Moreover, this protocol should be regarded as preliminary and could be further enhanced (e.g., by using chlorhexidine gargle, increasing the frequency of topical probiotic use, improving the active ingredients of probiotic tablets, etc.)32,33.
Some limitations still exist in the protocol of probiotic therapy. In daily clinical practice, patients' oral hygiene behavior is influenced by various factors. Some have difficulty performing adequate oral hygiene management, despite being professionally instructed. Insufficient home oral cleaning undermines the benefits of professional periodontal treatment and even worsens the condition, especially for probiotic therapy. Thus, it is recommended to reinforce OHI at each follow-up visit and ask patients to practice the procedure again. Besides, the probiotic therapy in this article is not introduced to patients with peri-implantitis, due to its more complex pathology and controversial clinical trial results17. Further studies are required to explore a protocol of probiotic therapy for peri-implantitis.
To facilitate access to the extant studies related to diode laser treatment for periodontitis, and probiotic therapy for peri-implant diseases, a summary of these studies14,28,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,
48,49,50,51,52,53,54 is presented in Supplementary File 2 and Supplementary File 3, respectively.
The authors have no conflicts of interest.
This work was supported by the National Natural Science Foundation of China (grant numbers 82071078, 81870798, and 82170927).
Name | Company | Catalog Number | Comments |
1% iodophor | ADF, China | 21031051 | 100 mL |
3% hydrogen peroxide | Hebei Jianning, China | 210910 | 500 mL |
75% alcohol | Shandong Anjie, China | 2021100227 | 500 mL |
Diode laser (FOX 980) | A.R.C, Germany | PS01013 | 300-μm fiber tip |
Gracey curettes | Hu-Friedy, USA | 5/6, 7/8, 11/12, 13/14 | |
Low-speed handpiece | NSK, Japan | 0BB81855 | |
Periodontal probe | Shanghai Kangqiao Dental Instruments Factory, China | 44759.00 | |
Periodontal ultrasonic device (PT3) | Guilin zhuomuniao Medical Instrument, China | P2090028PT3 | |
Polishing paste | Datsing, China | 21010701 | |
Primacaine adrenaline | Produits Dentaires Pierre Rolland, France | S-52 | 1.7 mL |
Probiotic | Biogaia, Sweden | Prodentis | 30 probiotic tablets (24 g) |
Titanium ultrasound tip (P59) | Guilin Zhuomuniao Medical Instrument, China | 200805 |
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