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Goulart TS, Hawerroth T, da Silveira Teixeira C, Cesca K, Silva RR, de Moraes RR, Minamisako MC, Umeda Takashima MT, Cábia NC, Bortoluzzi EA, Mazzon RR, de Almeida J, da Fonseca Roberti Garcia L. Assessment of multispecies biofilm growth on root canal dentin under different radiation therapy regimens. Clin Oral Investig 2024; 28:324. [PMID: 38761225 DOI: 10.1007/s00784-024-05719-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Accepted: 05/08/2024] [Indexed: 05/20/2024]
Abstract
OBJECTIVES To assess the growth of a multispecies biofilm on root canal dentin under different radiotherapy regimens. MATERIALS AND METHODS Sixty-three human root dentin cylinders were distributed into six groups. In three groups, no biofilm was formed (n = 3): NoRT) non-irradiated dentin; RT55) 55 Gy; and RT70) 70 Gy. In the other three groups (n = 18), a 21-day multispecies biofilm (Enterococcus faecalis, Streptococcus mutans, and Candida albicans) was formed in the canal: NoRT + Bio) non-irradiated + biofilm; RT55 + Bio) 55 Gy + biofilm; and RT70 + Bio) 70 Gy + biofilm. The biofilm was quantified (CFUs/mL). Biofilm microstructure was assessed under SEM. Microbial penetration into dentinal tubules was assessed under CLSM. For the biofilm biomass and dentin microhardness pre- and after biofilm growth assessments, 45 bovine dentin specimens were distributed into three groups (n = 15): NoRT) non-irradiated + biofilm; RT55 + Bio) 55 Gy + biofilm; and RT70 + Bio) 70 Gy + biofilm. RESULTS Irradiated specimens (70 Gy) had higher quantity of microorganisms than non-irradiated (p = .010). There was gradual increase in biofilm biomass from non-irradiated to 55 Gy and 70 Gy (p < .001). Irradiated specimens had greater reduction in microhardness after biofilm growth. Irradiated dentin led to the growth of a more complex and irregular biofilm. There was microbial penetration into the dentinal tubules, regardless of the radiation regimen. CONCLUSION Radiotherapy increased the number of microorganisms and biofilm biomass and reduced dentin microhardness. Microbial penetration into dentinal tubules was noticeable. CLINICAL RELEVANCE Cumulative and potentially irreversible side effects of radiotherapy affect biofilm growth on root dentin. These changes could compromise the success of endodontic treatment in oncological patients undergoing head and neck radiotherapy.
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Affiliation(s)
- Taynara Santos Goulart
- Department of Dentistry - Endodontics Division, Health Sciences Center, Federal University of Santa Catarina, Campus Reitor João David Ferreira Lima, Florianópolis, CEP: 88040-900, Santa Catarina, Brazil
| | - Tainara Hawerroth
- Department of Endodontics, University of Southern Santa Catarina, Palhoça, Santa Catarina, Brazil
| | - Cleonice da Silveira Teixeira
- Department of Dentistry - Endodontics Division, Health Sciences Center, Federal University of Santa Catarina, Campus Reitor João David Ferreira Lima, Florianópolis, CEP: 88040-900, Santa Catarina, Brazil
| | - Karina Cesca
- Department of Chemical Engineering, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Rodrigo Rohenkohl Silva
- Department of Restorative Dentistry, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - Rafael Ratto de Moraes
- Department of Restorative Dentistry, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | | | | | - Nayara Cardoso Cábia
- Department of Radiotherapy, Oncology Research Center (CEPON), Florianópolis, SC, Brazil
| | - Eduardo Antunes Bortoluzzi
- Department of Diagnosis & Oral Health, Endodontics Division, University of Louisville, Louisville, KY, USA
| | - Ricardo Ruiz Mazzon
- Department of Microbiology, Immunology and Parasitology, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Josiane de Almeida
- Department of Endodontics, University of Southern Santa Catarina, Palhoça, Santa Catarina, Brazil
| | - Lucas da Fonseca Roberti Garcia
- Department of Dentistry - Endodontics Division, Health Sciences Center, Federal University of Santa Catarina, Campus Reitor João David Ferreira Lima, Florianópolis, CEP: 88040-900, Santa Catarina, Brazil.
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Reddy KH, Swetha B, Priya BD, Mohan TM, Malini DL, Sravya MS. Effect of collagen cross-linking agents on the depth of penetration of bioceramic sealer and release of hydroxyproline: An in vitro study. JOURNAL OF CONSERVATIVE DENTISTRY AND ENDODONTICS 2024; 27:170-174. [PMID: 38463481 PMCID: PMC10923233 DOI: 10.4103/jcd.jcd_309_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 09/29/2023] [Accepted: 10/07/2023] [Indexed: 03/12/2024]
Abstract
Context During endodontic treatment, sealers seal off dentinal tubules and prevent microbial attack. Bioceramic sealers have excellent bioactivity, but its high alkalinity is found to have detrimental effects on radicular collagen. Collagen cross linkers have the ability to chemically modify collagen and can prevent the detrimental effects of the sealer. Aim This research was aimed to assess the effect of collagen cross-linking agents on the integrity of radicular collagen matrix and depth of penetration of sealer. Materials and Methods Mandibular premolars (n = 48) were taken. Teeth were decoronated; canals were prepared till ProTaper size F2 and were irrigated with 5 mL of 2.5% NaOCl, followed by 3 mL of 17% ethylenediaminetetraacetic acid between instrumentation and finally rinsed with saline following which teeth were divided into three groups based on the surface treatments: Group 1: 6.5% proanthocyanin (PA), Group 2: chlorhexidine (CHX), and Group 3: saline. Teeth were obturated using gutta-percha and bioceramic sealer and stored in artificial saliva. Hydroxyproline (HYP) release was assessed after 14 and 21 days using spectrophotometer. Sealer penetration was assessed using the scanning electron microscope. Statistical Analysis Wilcoxon signed-rank test and Kruskal-Wallis test for release of HYP and paired t-test and ANOVA for sealer penetration were performed. Results Significantly lower release of HYP was seen in proanthocyanin-treated group. Sealer penetration was better for both the proanthocyanin- and CHX-treated groups when compared to saline. Conclusion Surface treatment with collagen cross-linkers caused a decrease in the amount of HYP released, indicating lesser degradation of collagen. Sealer penetration was better due to the removal of smear layer following the surface treatments.
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Affiliation(s)
- K. Hanisha Reddy
- Associate Professor, Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Vijayawada, Andhra Pradesh, India
| | - Bollineni Swetha
- Assistant Professor, Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Vijayawada, Andhra Pradesh, India
| | - B. Devi Priya
- Assistant Professor, Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Vijayawada, Andhra Pradesh, India
| | - T Murali Mohan
- Professor and HOD, Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Vijayawada, Andhra Pradesh, India
| | - Duvvuri Lakshmi Malini
- Assistant Professor, Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Vijayawada, Andhra Pradesh, India
| | - M. Sai Sravya
- Government Dental College and Hospital, Vijayawada, Andhra Pradesh, India
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Sakurai I, Mayanagi G, Yamada S, Takahashi N. In situ detection of endogenous proteolytic activity and the effect of inhibitors on tooth root surface. J Dent 2023; 131:104471. [PMID: 36828151 DOI: 10.1016/j.jdent.2023.104471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 02/08/2023] [Accepted: 02/21/2023] [Indexed: 02/24/2023] Open
Abstract
OBJECTIVES The aim of this study was to clarify the distribution and activity of proteolytic enzymes and examine the inhibitory effects of various substances on this proteolytic activity on tooth root surfaces in situ. METHODS Disk-shaped bovine tooth root samples were partly pretreated in acid solution (50 mM lactic acid buffer, pH 4.0) for 48 h. The fluorescence intensity of samples was detected with fluorescent substrate solution for collagenase and gelatinase using a stereoscopic fluorescence microscope for 60 min. The acid-pretreated and non-acid-pretreated root samples were treated with chlorhexidine (CHX), sodium fluoride (NaF), epigallocatechin gallate (EGCG), and calcium hydroxide (Ca(OH)2) for 10 min, and silver diamine fluoride (SDF) for 10, 30, and 60 s. These samples were immersed in the fluorescence substrate solution at pH 7.0, and the fluorescence intensity of samples was detected. The fluorescence intensity was calculated using analysis software. RESULTS Gelatinase activity was detected in root samples. Gelatinase activity of the acid-pretreated side was significantly higher than that of the non-acid-pretreated side (1.63 times) at 60 min. CHX, EGCG, Ca(OH)2, and SDF decreased the gelatinase activity of root samples, while NaF had no effect. CONCLUSIONS Gelatinase activity was detected from the root in situ and it was increased by acid-pretreatment. CHX, EGCG, Ca(OH)2, and SDF inhibited gelatinase activity. CLINICAL SIGNIFICANCE Substances that inhibit proteolytic activity found in this research method will be useful for root caries prevention.
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Affiliation(s)
- Izumi Sakurai
- Division of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Japan; Division of Oral Ecology and Biochemistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
| | - Gen Mayanagi
- Division for Advanced Education Development, Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, Japan
| | - Satoru Yamada
- Division of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Japan
| | - Nobuhiro Takahashi
- Division of Oral Ecology and Biochemistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
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Jesus LSD, Reis TLDS, Machado BGMDM, Costa ALMD, Savaris JM, Volpato CAM, Bortoluzzi EA, Teixeira CDS, Fernandes PCDSV, Garcia LDFR. Dental and composite resin discoloration induced by different hydraulic calcium silicate-based cements: two-year in vitro assessment. J Appl Oral Sci 2023; 31:e20220444. [PMID: 37132699 PMCID: PMC10159045 DOI: 10.1590/1678-7757-2022-0444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 03/12/2023] [Indexed: 05/04/2023] Open
Abstract
Few long-term studies assess the discoloration induced by hydraulic calcium silicate-based cement on dental structures. In addition, as far as we know, no long-term study has assessed the discoloration induced by these cement on composite resin. This in vitro study aimed to assess, during a period of two years, the discoloration potential of different hydraulic calcium silicate-based cements (hCSCs) on the enamel/dentin structure and composite resin restoration. A total of 40 enamel/dentin discs were obtained from bovine incisors, and 40 composite resin discs (10 mm in diameter × 2 mm thick) were fabricated. A 0.8 mm-deep cavity was made in the center of each disc and filled with the following hCSCs (n=10): Original MTA (Angelus); MTA Repair HP (Angelus); NeoMTA Plus (Avalon); and Biodentine (Septodont). An initial color measurement was performed (T0 - baseline). After 7, 15, 30, 45, 90, 300 days, and two years, new color measurements were performed to determine the color (ΔE00), lightness (ΔL'), chroma (ΔC'), hue differences (ΔH'), and whiteness index (WID). For enamel/dentin, the ΔE00 was significant among groups and periods (p<0.05). NeoMTA Plus had the greatest ΔE00. The NeoMTA Plus group had the greatest ΔE00 after two years for composite resin. Significant reduction in lightness was observed for all groups after two years (p<0.05). The most significant WID values were observed after 30 days for Biodentine (enamel/dentin) and MTA Repair HP groups (composite resin) (p<0.05). The hCSCs changed the colorimetric behavior of both substrates, leading to greater darkening over time. The Bi2O3 in the Original MTA seems relevant in the short periods of color change assessment.
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Affiliation(s)
- Lucas Santos de Jesus
- Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Departmento de Odontologia - Endodontia, Florianópolis, SC, Brasil
| | | | | | | | - Julia Menezes Savaris
- Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Departmento de Odontologia - Endodontia, Florianópolis, SC, Brasil
| | - Claudia Angela Maziero Volpato
- Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Departmento de Odontologia - Endodontia, Florianópolis, SC, Brasil
| | - Eduardo Antunes Bortoluzzi
- University of Louisville, Department of Diagnosis & Oral Health - Endodontics Division, Louisville, KY, USA
| | - Cleonice da Silveira Teixeira
- Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Departmento de Odontologia - Endodontia, Florianópolis, SC, Brasil
| | | | - Lucas da Fonseca Roberti Garcia
- Universidade Federal de Santa Catarina, Centro de Ciências da Saúde, Departmento de Odontologia - Endodontia, Florianópolis, SC, Brasil
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Inhibitory activity of S-PRG filler on collagen-bound MMPs and dentin matrix degradation. J Dent 2022; 124:104237. [PMID: 35863550 DOI: 10.1016/j.jdent.2022.104237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 07/13/2022] [Accepted: 07/17/2022] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVES To evaluate the inhibitory activity of an ion-releasing filler (S-PRG) eluate on dentin collagen-bound metalloproteinases (MMPs) and dentin matrix degradation. METHODS Dentin beams (5 × 2 × 0.5 mm) from human molars were completely demineralized to produce dentin matrix specimens. The dry mass was measured, and a colorimetric assay (Sensolyte) determined the initial total MMP activity to allocate the beams into four treatment groups (n = 10/group): 1) water for 1 min (negative control); 2) 2% chlorhexidine digluconate (CHX - inhibitor control) for 1 min; 3) S-PRG eluate for 1 min; 4) S-PRG eluate for 30 min. After the treatments, the total MMP activity was reassessed. The specimens were stored in simulated body fluid (SBF) at 37 °C for up to 21 days. The dry mass was reassessed weekly. On day 7, the dentin matrix degradation was analyzed for the presence of collagen fragments (CF; Sirius Red) and hydroxyproline (Hyp) in the SBF. Statistical analyses were performed with ANOVA/Tukey, paired t-tests, and RM-ANOVA/Sidak (α = 5%). RESULTS S-PRG eluate exposure for 1 and 30 min reduced (p < 0.0001) MMP activity. S-PRG exposure for 30 min presented MMP activity inhibition equivalent to CHX (p = 0.061). S-PRG and CHX decreased CF (p ≤ 0.007) and Hyp (p < 0.046) release. After 21 days of storage, S-PRG-treated beams, regardless of exposure time, presented a reduced (p ≤ 0.017) mass loss, intermediate between CHX and control. CONCLUSION Treating demineralized dentin with S-PRG eluate for 1 or 30 min reduced matrix-bound MMP activity and dentin matrix degradation for up to 21 days. CLINICAL SIGNIFICANCE S-PRG filler may hinder the progression of dentin carious/erosive lesions and enhance the stabilization of dentin bonding interfaces.
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