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Bao P, Liu H, Yang L, Zhang L, Yang L, Xiao N, Shen J, Deng J, Shen Y. In vitro efficacy of Er:YAG laser-activated irrigation versus passive ultrasonic irrigation and sonic-powered irrigation for treating multispecies biofilms in artificial grooves and dentinal tubules: an SEM and CLSM study. BMC Oral Health 2024; 24:261. [PMID: 38389109 PMCID: PMC10882935 DOI: 10.1186/s12903-024-04042-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 02/17/2024] [Indexed: 02/24/2024] Open
Abstract
BACKGROUND Multispecies biofilms located in the anatomical intricacies of the root canal system remain the greatest challenge in root canal disinfection. The efficacy of Er:YAG laser-activated irrigation techniques for treating multispecies biofilms in these hard-to-reach areas has not been proved. The objective of this laboratory study was to evaluate the effectiveness of two Er:YAG laser-activated irrigation techniques, namely, photon-induced photoacoustic streaming (PIPS) and shock wave-enhanced emission photoacoustic streaming (SWEEPS), in treating multispecies biofilms within apical artificial grooves and dentinal tubules, in comparison with conventional needle irrigation (CNI), passive ultrasonic irrigation (PUI), and sonic-powered irrigation (EDDY). Two types of multispecies root canal biofilm models were established in combination with two assessment methods using scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) with the aim to obtain more meaningful results. METHODS Ninety extracted human single-rooted premolars were chosen for two multispecies biofilm models. Each tooth was longitudinally split into two halves. In the first model, a deep narrow groove was created in the apical segment of the canal wall. After cultivating a mixed bacterial biofilm for 4 weeks, the split halves were reassembled and subjected to five irrigation techniques: CNI, PUI, EDD, PIPS, and SWEEPS. The residual biofilms inside and outside the groove in Model 1 were analyzed using SEM. For Model 2, the specimens were split longitudinally once more to evaluate the percentage of killed bacteria in the dentinal tubules across different canal sections (apical, middle, and coronal thirds) using CLSM. One-way analysis of variance and post hoc multiple comparisons were used to assess the antibiofilm efficacy of the 5 irrigation techniques. RESULTS Robust biofilm growth was observed in all negative controls after 4 weeks. In Model 1, within each group, significantly fewer bacteria remained outside the groove than inside the groove (P < 0.05). SWEEPS, PIPS and EDDY had significantly greater biofilm removal efficacy than CNI and PUI, both from the outside and inside the groove (P < 0.05). Although SWEEPS was more effective than both PIPS and EDDY at removing biofilms inside the groove (P < 0.05), there were no significant differences among these methods outside the groove (P > 0.05). In Model 2, SWEEPS and EDDY exhibited superior bacterial killing efficacy within the dentinal tubules, followed by PIPS, PUI, and CNI (P < 0.05). CONCLUSION Er:YAG laser-activated irrigation techniques, along with EDDY, demonstrated significant antibiofilm efficacy in apical artificial grooves and dentinal tubules, areas that are typically challenging to access.
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Affiliation(s)
- Pingping Bao
- School and Hospital of Stomatology, Tianjin Medical University, Tianjin, 300070, China
- Department of Endodontics, School of Medicine, Tianjin Stomatological Hospital, Nankai University, Tianjin, China
- Tianjin Key Laboratory of Oral and Maxillofacial Function Reconstruction, Tianjin, 300041, China
| | - He Liu
- Department of Oral Biological & Medical Sciences, Faculty of Dentistry, University of British Columbia, 2199 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Lan Yang
- Hangzhou Stomatological Hospital, Hangzhou, China
| | - Lulu Zhang
- Department of Endodontics, School of Medicine, Tianjin Stomatological Hospital, Nankai University, Tianjin, China
- Tianjin Key Laboratory of Oral and Maxillofacial Function Reconstruction, Tianjin, 300041, China
| | - Liwei Yang
- Department of Endodontics, School of Medicine, Tianjin Stomatological Hospital, Nankai University, Tianjin, China
- Tianjin Key Laboratory of Oral and Maxillofacial Function Reconstruction, Tianjin, 300041, China
| | - Nannan Xiao
- State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, China
| | - Jing Shen
- Department of Endodontics, School of Medicine, Tianjin Stomatological Hospital, Nankai University, Tianjin, China.
- Tianjin Key Laboratory of Oral and Maxillofacial Function Reconstruction, Tianjin, 300041, China.
| | - Jiayin Deng
- School and Hospital of Stomatology, Tianjin Medical University, Tianjin, 300070, China.
| | - Ya Shen
- Department of Oral Biological & Medical Sciences, Faculty of Dentistry, University of British Columbia, 2199 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada.
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Wang H, Chen X, Zhang L, Han Z, Zheng J, Qi Y, Zhao W, Xu X, Li T, Zhou Y, Bao P, Xue X. Dual-Fuel Propelled Nanomotors with Two-Stage Permeation for Deep Bacterial Infection in the Treatment of Pulpitis. Adv Sci (Weinh) 2024; 11:e2305063. [PMID: 38044274 PMCID: PMC10837366 DOI: 10.1002/advs.202305063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 11/05/2023] [Indexed: 12/05/2023]
Abstract
Bacterial infection-induced inflammatory response could cause irreversible death of pulp tissue in the absence of timely and effective therapy. Given that, the narrow structure of root canal limits the therapeutic effects of passive diffusion-drugs, considerable attention has been drawn to the development of nanomotors, which have high tissue penetration abilities but generally face the problem of insufficient fuel concentration. To address this drawback, dual-fuel propelled nanomotors (DPNMs) by encapsulating L-arginine (L-Arg), calcium peroxide (CaO2 ) in metal-organic framework is developed. Under pathological environment, L-Arg could release nitric oxide (NO) by reacting with reactive oxygen species (ROS) to provide the driving force for movement. Remarkably, the depleted ROS could be supplemented through the reaction between CaO2 with acids abundant in the inflammatory microenvironment. Owing to high diffusivity, NO achieves further tissue penetration based on the first-stage propulsion of nanomotors, thereby removing deep-seated bacterial infection. Results indicate that the nanomotors effectively eliminate bacterial infection based on antibacterial activity of NO, thereby blocking inflammatory response and oxidative damage, forming reparative dentine layer to avoid further exposure and infection. Thus, this work provides a propagable strategy to overcome fuel shortage and facilitates the therapy of deep lesions.
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Affiliation(s)
- Heping Wang
- State Key Laboratory of Medicinal Chemical BiologyCollege of PharmacyNankai UniversityHaihe Education Park, 38 Tongyan RoadTianjin300353P. R. China
- Present address:
Key Laboratory of Radiopharmacokinetics for Innovative DrugsChinese Academy of Medical SciencesTianjin Key Laboratory of Radiation Medicine and Molecular Nuclear MedicineInstitute of Radiation MedicineChinese Academy of Medical Sciences & Peking Union Medical CollegeTianjin300192P. R. China
| | - Xi Chen
- State Key Laboratory of Medicinal Chemical BiologyCollege of PharmacyNankai UniversityHaihe Education Park, 38 Tongyan RoadTianjin300353P. R. China
| | - Lulu Zhang
- Tianjin Key Laboratory of Oral and Maxillofacial Function ReconstructionTianjin Stomatological HospitalThe Affiliated Stomatological Hospital of Nankai UniversityTianjin300041P. R. China
- School of MedicineNankai UniversityTianjin300071P. R. China
| | - Ziwei Han
- State Key Laboratory of Medicinal Chemical BiologyCollege of PharmacyNankai UniversityHaihe Education Park, 38 Tongyan RoadTianjin300353P. R. China
| | - Jinxin Zheng
- Tianjin Key Laboratory of Oral and Maxillofacial Function ReconstructionTianjin Stomatological HospitalThe Affiliated Stomatological Hospital of Nankai UniversityTianjin300041P. R. China
| | - Yilin Qi
- State Key Laboratory of Medicinal Chemical BiologyCollege of PharmacyNankai UniversityHaihe Education Park, 38 Tongyan RoadTianjin300353P. R. China
| | - Weitao Zhao
- State Key Laboratory of Medicinal Chemical BiologyCollege of PharmacyNankai UniversityHaihe Education Park, 38 Tongyan RoadTianjin300353P. R. China
| | - Xihan Xu
- State Key Laboratory of Medicinal Chemical BiologyCollege of PharmacyNankai UniversityHaihe Education Park, 38 Tongyan RoadTianjin300353P. R. China
| | - Tianqi Li
- State Key Laboratory of Medicinal Chemical BiologyCollege of PharmacyNankai UniversityHaihe Education Park, 38 Tongyan RoadTianjin300353P. R. China
| | - Yutong Zhou
- State Key Laboratory of Medicinal Chemical BiologyCollege of PharmacyNankai UniversityHaihe Education Park, 38 Tongyan RoadTianjin300353P. R. China
| | - Pingping Bao
- Tianjin Key Laboratory of Oral and Maxillofacial Function ReconstructionTianjin Stomatological HospitalThe Affiliated Stomatological Hospital of Nankai UniversityTianjin300041P. R. China
| | - Xue Xue
- State Key Laboratory of Medicinal Chemical BiologyCollege of PharmacyNankai UniversityHaihe Education Park, 38 Tongyan RoadTianjin300353P. R. China
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