RESUMO
INTRODUCTION: The objective of this study was to investigate the action of photodynamic therapy on pain control after endodontic treatment in asymptomatic teeth with a primary infection, within a single visit. METHODS: Sixty (60) single-rooted teeth with pulp necrosis and periapical lesions were selected and randomly divided into two (2) groups (n = 30), according to the protocol; a control group (CG) and a group using photodynamic therapy (aPDT). The canals were instrumented with Reciproc files # 25 up to 40 along the entire length of the canal, using 2% chlorhexidine gel as the auxiliary chemical substance, followed by irrigation with sterile saline. aPDT consited of 0.005% methylene blue as photosensitizer, using AsGaAl diode laser, 660 nm wavelength, 100 mW of power and 9 J of energy, using optical fibers with 365 µm in diameter. The canals were filled with Endomethasone N cement. RESULTS: Pain intensity was assessed at 8, 12, 24, 48, 72 h and 1 week after endodontic treatment using a visual analogue scale. The level of pain was classified as none (0), mild (1-3), moderate (4-7) or severe (8-10). The data were at a significance level of 5%. There was a statistically significant difference (p<0.05) in the periods of 8, 12, 24, 48 and 72 h between the control group and the aPDT group. After 1 week, there was no statistically significant difference. CONCLUSIONS: It is concluded that photodynamic therapy had a significant effect on decreasing post-endodontic treatment pain in teeth with necrotic pulp and asymptomatic periapical lesions.
Assuntos
Fotoquimioterapia , Cavidade Pulpar , Humanos , Lasers Semicondutores/uso terapêutico , Azul de Metileno/uso terapêutico , Dor Pós-Operatória/tratamento farmacológico , Fotoquimioterapia/métodos , Fármacos Fotossensibilizantes/uso terapêuticoRESUMO
Methylene blue (MB) remains the most frequently used tracer for dye penetration tests of endodontic fillings, despite its chemical reactions with different materials. This study checked whether dye penetration displayed by MB is comparable to Rhodamine B (RB). One hundred and seventy-two root canals were filled with gutta-percha and six sealers. Samples were covered with nail varnish except for the apical area, and immersed in MB or RB solutions under negative pressure. After 24 h, roots were bisected, photographed and the maximal dye penetration recorded. Dye penetrations displayed by MB and RB were compared (Newman-Keuls test). MB and RB displayed comparable results for groups filled with AH Plus, EndoREZ and Polifil (P > 0.05). For Endofill, Sealer 26 and Sealapex, a significant lower dye penetration was observed when MB was used (P < 0.05). Laboratory tests using MB for measuring dye penetration through filled root canals can result in misleading conclusions.
Assuntos
Corantes , Infiltração Dentária/classificação , Azul de Metileno , Materiais Restauradores do Canal Radicular/química , Bismuto/química , Hidróxido de Cálcio/química , Resinas Compostas/química , Colagem Dentária , Resinas Epóxi/química , Corantes Fluorescentes , Guta-Percha/química , Humanos , Teste de Materiais , Reprodutibilidade dos Testes , Rodaminas , Preparo de Canal Radicular/instrumentação , Preparo de Canal Radicular/métodos , Salicilatos/química , Propriedades de Superfície , Fatores de TempoRESUMO
The purpose of this study was to compare the incidence of dentinal defects (fractures and craze lines) after canal preparation with different nickel-titanium rotary files. Two hundred sixty mandibular premolars were selected. Forty teeth were left unprepared (n = 40). The other teeth were prepared either with manual Flexofiles (n = 20) or with different rotary files systems: ProTaper (Dentsply-Maillefer, Ballaigues, Switzerland), ProFile (Dentsply-Maillefer), SystemGT (Dentsply-Maillefer), or S-ApeX (FKG Dentaire, La Chaux-de-Fonds, Switzerland) (n = 50 each). Roots were then sectioned 3, 6, and 9 mm from the apex and observed under a microscope. The presence of dentinal defects was noted. There was a significant difference in the appearance of defects between the groups (p < 0.05). No defects were found in the unprepared roots and those prepared with hand files and S-ApeX. ProTaper, ProFile, and GT preparations resulted in dentinal defects in 16%, 8%, and 4% of teeth, respectively. Some endodontic preparation methods might damage the root and induce dentinal defects.
Assuntos
Instrumentos Odontológicos/efeitos adversos , Dentina/lesões , Preparo de Canal Radicular/efeitos adversos , Preparo de Canal Radicular/instrumentação , Raiz Dentária/lesões , Dente Pré-Molar , Ligas Dentárias , Cavidade Pulpar/lesões , Humanos , Níquel , Titânio , Fraturas dos Dentes/etiologiaRESUMO
OBJECTIVE: The goal of this study was to check whether leakage results of the same specimens measured by 2 different leakage models are similar. STUDY DESIGN: Canine root canals were prepared and filled with cold gutta-percha cones and 1 of 4 sealers (20 canals for each sealer). The 80 specimens were first connected to a fluid transport model where air-bubble movement was measured. The same specimens were later connected to a glucose penetration model where the concentration of glucose was measured. In both models, a headspace pressure of 30 kPa was used to accelerate leakage. RESULTS: In both models, 4 sealers ranked the same regarding the leakage they allowed, and a significant correlation between the results of the 2 models was confined (Spearman test coefficient = 0.65; P = .000001). CONCLUSION: Under the conditions of this study, leakage results of 80 specimens recorded in the fluid transport model and glucose penetration model were similar.