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1.
Photomed Laser Surg ; 35(4): 184-189, 2017 Apr.
Article in English | MEDLINE | ID: mdl-28068186

ABSTRACT

OBJECTIVE: To evaluate the antibacterial efficacy of photodynamic therapy (PDT) and chitosan against Enterococcus faecalis and assess the possible enhancive effect of chitosan on the photosensitizer methylene blue in experimentally infected root canals of extracted human teeth in vitro. BACKGROUND DATA: E. faecalis is frequently found in persistent endodontic infections. In this context, the antimicrobial PDT or newer antibacterial alternatives such as chitosan could become modern alternatives to existing antibacterial treatment approaches. METHODS: One hundred two single-rooted extracted teeth were used. The teeth were contaminated with 0.1 mL E. faecalis (3 × 108 cell/mL). These were randomized into six treatment groups (n = 17 teeth): Group 1 (2.5% NaOCl); Group 2 (PDT); Group 3 (chitosan 3 mg/mL); Group 4 (PDT+chitosan 3 mg/mL); Group 5 (positive control, no treatment); and Group 6 (negative control, no inoculation, no treatment). The canal content was sampled with sterile paper points. The samples were cultured on blood agar plates to determine the number of colony-forming units (CFU)/mL. Five teeth in each group were analyzed by scanning electron microscope (SEM) to determine the percentage of area with contamination and debris. RESULTS: The positive control group showed the highest number of CFU/mL, with statistically significant differences in comparison with the other treatment groups (p ≤ 0.05). Group 4 (PDT+chitosan) showed the lowest CFU/mL count, followed by Group 2 (PDT alone), which obtained similar results to Group 1 (NaOCl), but there was no significance between the treated groups. SEM images showed that Group 4 (PDT+Chitosan) showed the lowest area of contamination. CONCLUSIONS: Combination of PDT and chitosan showed antibacterial potential against endodontic infection by E. faecalis.


Subject(s)
Chitosan/pharmacology , Dental Pulp Cavity/drug effects , Dental Pulp Cavity/microbiology , Enterococcus faecalis/pathogenicity , Gram-Positive Bacterial Infections/drug therapy , Photochemotherapy/methods , Enterococcus faecalis/drug effects , Humans , In Vitro Techniques , Reference Values , Risk Factors , Root Canal Preparation/methods , Sensitivity and Specificity , Tooth Extraction
2.
Rev. esp. patol ; 36(2): 195-201, abr. 2003. ilus
Article in Es | IBECS | ID: ibc-26203

ABSTRACT

Antecedentes: El piercing, conocido desde la antigüedad como una manifestación religiosocultural, representa actualmente un auténtico fenómeno social (el 8 por ciento de la población australiana) y sanitario (complicaciones). Métodos: Estudiamos las lenguas de 8 perros Beagle (sometidos a otro experimento), a las que realizamos el piercing por la técnica convencional en el animalario de la Universidad de Murcia (Licencia 30030-2AB), realizando el estudio clínico-fotográfico así como anatomopatológico de las lesiones tras el sacrificio de los animales a los 7 y 14 días, 1,2 y 3 meses del implante. Resultados: A los 7 días destacaba el eritema en ambos orificios y el tejido de granulación joven con infiltrados de polinucleares neutrófilos tapizando ambos lados del trayecto. A los 15 días persistía el eritema ligeramente sobreelevado, con infiltrados linfocitarios y signos regenerativos epiteliales. Al mes, permanecía el eritema, destacando el tejido de granulación crónico y lengüetas del epitelio hacia los lados del trayecto. A los dos meses, predominaba la fibrosis con reepitelización casi total, y a los tres meses la fibrosis tapizaba el trayecto con penetración irregular hacia el músculo adyacente y reepitelización casi total. Desde los 15 días se observaban numerosos granulomas a cuerpo extraño. Conclusión: El piercing lingual origina reparación fibrosa con reepitelización casi total de los bordes del trayecto y una inflamación granulomatosa a cuerpo extraño (AU)


Subject(s)
Animals , Dogs , Wounds, Stab/physiopathology , Disease Models, Animal
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