RESUMO
The treatment of advanced periodontal breakdown as a result of an associated endodontic lesion continues to challenge the practitioner. Two cases of teeth with endodontic pathologic conditions that required apical surgery are presented. On raising the flap, no buccal cortical plate was found, significantly lowering the prognosis of the surgery. A barrier membrane was used in addition to the apical surgery, which on postoperative follow-up appears to have resulted in the reestablishment of the buccal cortical plate.
Assuntos
Perda do Osso Alveolar/cirurgia , Apicectomia , Regeneração Tecidual Guiada Periodontal , Periodontite Periapical/cirurgia , Obturação Retrógrada , Adulto , Perda do Osso Alveolar/complicações , Regeneração Óssea , Doenças da Polpa Dentária/complicações , Doenças da Polpa Dentária/cirurgia , Feminino , Humanos , Incisivo/cirurgia , Masculino , Equipe de Assistência ao Paciente , Periodontite Periapical/complicaçõesRESUMO
The purpose of this in vitro study was to determine the feasibility of using dual wavelength spectrophotometry to identify teeth with pulp chambers that are either empty, filled with fixed pulp tissue, or filled with oxygenated blood. In phase I of the experiment, a human third molar was prepared so that its pulp space could be filled with oxygenated blood and later emptied. In phase II, the lower jaw of a beagle dog was removed and placed in formalin, thereby fixing the pulps of the teeth. The pulp of the right canine was removed via an apical approach, and attachments were placed in a similar position to those on the human tooth, to allow filling and emptying of the pulp space. Cavit was placed over the exposed fixed pulp in the left canine. Ten readings, which were separated by light source and detector removal and replacement, were taken of the right canine pulp space when it was empty or filled with oxygenated blood, or the left canine pulp space when it was filled with fixed tissue. Distinct and reproducible changes were measured for pulp spaces filled with air, tissue, or oxygenated blood. In phase III, simulated pulp testing on a dog tooth model was performed. Blood was introduced into the root canal space, the chamber was rinsed with water and replaced with air, according to a predetermined code. Spectrophotometer readings were recorded. The identification of pulpal contents was correctly determined in all 20 of the predetermined conditions. The findings indicate that continuous wave spectrophotometry may become a useful pulp testing method.
Assuntos
Teste da Polpa Dentária/métodos , Animais , Determinação do Volume Sanguíneo/métodos , Polpa Dentária/irrigação sanguínea , Teste da Polpa Dentária/instrumentação , Cães , Humanos , Oximetria/métodos , Espectrofotometria/métodosRESUMO
The root canals of 48 single-canal canine teeth were prepared by four different methods. The coronal lingual wall and root canal space were lowered to 2 mm below the buccal wall of the roots. The prepared root was placed into acrylic resin so that 12 mm of buccal root was exposed. A slowly increasing force was applied at the junction of the buccal wall and root canal space until fracture occurred. The force of fracture of the buccal root wall of each root was recorded and the results in each group were compared. All teeth fractured at the buccal wall/acrylic resin junction. Instrumentation of the root canals significantly weakened the roots. Obturation of the canals in conjunction with Roth's 801 sealer did not strengthen the roots. Obturation of the canals in conjunction with a glass ionomer sealer significantly strengthened the roots as compared with roots instrumented but not obturated and those obturated with gutta-percha and Roth's 801 Sealer.
Assuntos
Cimentos de Ionômeros de Vidro , Materiais Restauradores do Canal Radicular , Tratamento do Canal Radicular/efeitos adversos , Fraturas dos Dentes/prevenção & controle , Análise de Variância , Dente Canino , Guta-Percha , Humanos , Fraturas dos Dentes/etiologiaRESUMO
Presence of human immunodeficiency virus (HIV) within noninflamed human dental pulps was documented by polymerase chain reaction assays in 11 of 12 pulps from HIV-seropositive patients. The purpose of the present study was to determine the cellular location of HIV in vivo within these tissues by means of in situ hybridization. Results of the in situ hybridization indicated HIV within fibroblasts of the pulp. These results are especially relevant because fibroblasts lack the CD4 receptor thought necessary for in vivo infection with HIV. These results suggest the fibroblast as a possible reservoir for HIV in the body.