ABSTRACT
Two groups of titanium dental implants, identical in geometry but different in the treatment of their surfaces, were tested in an in vivo minipig model of the mandible. The surfaces that were tested were, first, sandblasted and acid-etched; and secondly, sandblasted, acid-etched, and conditioned. The removal torque was assessed at 2, 4, and 8 weeks after implantation (n=6 animals in each healing period). The interfacial stiffness was also evaluated. All dental implants were well-integrated at the time of death. Removal torque values increased significantly over the course of 8 weeks. Removal torque and interfacial stiffness were increased for conditioned surfaces after 2 weeks, but there were no significant differences between the two surfaces. The sandblasted and acid-etched implants are the standard, and conditioning of the surface showed a tendency to increase early peri-implant formation of bone.
Subject(s)
Dental Implants , Dental Materials/chemistry , Hydroxides/chemistry , Titanium/chemistry , Acid Etching, Dental/methods , Animals , Biomechanical Phenomena , Dental Etching/methods , Dental Implantation, Endosseous/methods , Dental Prosthesis Design , Dental Stress Analysis/instrumentation , Elastic Modulus , Mandible/surgery , Materials Testing , Osseointegration/physiology , Osteogenesis/physiology , Rotation , Surface Properties , Swine , Swine, Miniature , Time Factors , TorqueABSTRACT
In certain cases, the use of a Jones Tube is necessary for lacrimal duct reconstruction. Although the principle is straight forward, the practical procedure can prove to be difficult. The procedure requires the resection of the medial bony wall of the lacrimal sac. We form a duct between the medial canthus and the nasal cavity using a 14 gauge canula. By removing the needle, the catheter remains in place and serves as a guide for the placement of the Jones Tube with the assistance of an obturator. Thus the duct is not lost and an additional puncture is unnecessary.
