Journal of implantology and applied sciences ISSN:2765-7833(Print) 2765-7841(Online) 대한구강악안면임플란트학회지

The deformity must be minimized during the impression taking procedure for the passive adhesion of the multiple fixed prosthodontic implants to occur. The first method that has been introduced for this is to tie the coping intraorally before the impression taking procedure. Autopolymerizing acrylic resin is a generally used material intraorally during the impression taking procedure to connect the coping. However the acrylic resin produces much heat during curing and it has a risk that it transfers much heat to the implant bone interface when applied directly to the copings for implant impression or the abutment. The purpose of this study was to evaluate the amount of heat transferred to the implant bone interface in the procedure where the autopolymerizing acrylic resin was used to connect the coping before the impression taking procedure of several implants. The domestic Osstem implant(Osstem dental implant, Pusan, South Korea), with diameter of 4mm, length of 13mm of the USII(external hexagon connection, RBM surface)implant fixture was used and thermocouple wire was attached to the first thread , middle and apex of the cervical area. This particular fixture and the fixture with no thermocouple wire attached were covered with acrylic resin with 2cm distance apart. The platform and exterior hexagon of the fixture was taken caution of not to be flasked in the acrylic resin block. The specimen was placed under water of 37oC and the temperature was maintained throughout the procedure. The coping was connected above it and it was isolated by the rubber dam. In the first experimental group, the two impression copings were tied with the dental floss and autopolymerizing acrylic resin was applied above them connecting the impression coping at once. In the second experimental group, the acrylic resin was applied to the impression coping prior to the insertion of the fixture and additional resin was applied in between the spaces(1.5mm). The data was gathered using the K type thermocouple was used as the temperature measuring sensor, the LabView( National Instrument , Texas , US ) as the software in the monitoring system, PXI 6259( National Instrument , Texas , US )as the hardware. Each experiment group was read through the thermocouple wire every 0.5sec 10 times each. The two experimental groups showed lots of heat transfer. The cervical area had the most temperature increase. There was a mean of 43.1oC in the first experimental group in the cervical area. In the second experimental group, there was an increase up to 40.4oC. The temperature decreased after maintaining the high temperature for about 5 minutes. It was possible to see the great amount of heat being transferred to the implant bone interface through connecting the impression coping with the autopolymerizing resin. But when the acrylic resin was applied to the impression coping prior to the insertion of the fixture and additional resin was applied in between the spaces(1.5mm), the temperature increased at slight. So it cannot be concluded that there may be some side effect to the bone.