RESUMO
This study assessed the apical transportation using Mani GPR or HyFlex NT during the retreatment of curved root canals. Thirty-eight roots were analysed using micro-CT for the comparison of apical transportation produced by two retreatment systems. Longitudinal transportation, horizontal transportation, variation in the canal angle of curvature and variation in the canal/root width ratio were analysed. Longitudinal transportation was frequently observed, regardless of the system used. The canals retreated with Mani GPR showed a significantly higher horizontal transportation at 1 mm from the root apex (P < 0.01) and greater variation of the canal curvature angle (P < 0.01). The canal/root width ratio was similar between groups (P > 0.05). In conclusion, longitudinal transportation occurred more frequently in the mesial canal walls. Mani GPR showed greater horizontal transportation at 1 mm short of the apex, and higher variation of the canal curvature angle compared with HyFlex NT.
Assuntos
Cavidade Pulpar , Preparo de Canal Radicular , Cavidade Pulpar/diagnóstico por imagem , Desenho de Equipamento , Dente Molar , Retratamento , Microtomografia por Raio-XRESUMO
Os microrganismos têm um papel essencial na etiopatogenia das principais alterações pulpares e periapicais. O resultado da terapia endodôntica em dentes contendo polpa necrosada e infectada depende da desinfecção bem-sucedida e obturação adequada do sistema de canais radiculares. A eliminação de microrganismos pode ocorrer pela ação mecânica, associado à irrigação dos canais radiculares. No entanto, apesar dos recentes avanços em termos de técnicas e instrumentos de preparo, diversas áreas do canal ainda permanecem com detritos dentinários e micro-organismos mesmo após a instrumentação. Isto ocorre em grande parte devido à complexidade anatômica. Assim, o objetivo desta revisão de literatura é apresentar diferentes abordagens para suplementar a desinfecção dos canais radiculares, incluindo a irrigação ultrassônica passiva (IUP), a irrigação final com clorexidina, Endovac®, o sistema Self-Adjusting File (SAF®), XP- Endo Finisher® e a terapia fotodinâmica (TF).
Microorganisms have an essential role in the etiopathogenesis of the pulp and periapical changes. The outcome of endodontic therapy in teeth with necrotic and infected pulp depends on successful disinfection and adequate filling of the root canal system. The elimination of microorganisms can occur by mechanical action, associated with irrigation of the root canals. However, despite recent advances in terms of techniques and tools of preparation, several areas of the canal remain with dentinal debris and microorganisms even after instrumentation. This occurs mainly due to anatomical complexity. Thus, the objective of this literature review is to present different approaches to supplement the disinfection of root canals, including passive ultrasonic irrigation (PUI), final irrigation with chlorhexidine, Endovac®, Self-Adjusting File system (SAF®), XP- Endo Finisher ® and Photodynamic Therapy (PDT).