Statement of problem. Resonance frequency analysis has been increasingly served as a non-invasive and objective method for clinical monitoring of implant stability. Many clinical studies must be required for standardized data using RFA. Purpose. This study was performed to evaluate RFA value changes...
Statement of problem. Resonance frequency analysis has been increasingly served as a non-invasive and objective method for clinical monitoring of implant stability. Many clinical studies must be required for standardized data using RFA. Purpose. This study was performed to evaluate RFA value changes in two anodized implant groups. Material and method. Among a total of 24 implants, twelve screw shaped implants as a test group (H2-R8.5) were manufactured, which had a pitch-height of 0.4 mm, an outer diameter of 4.3 mm, a length of 8.5 mm, and external hexa-headed, were turned from 5 mm rods of commercially pure titanium (ASTM Grade IV, Warantec Co., Seoul, Korea), and another twelve implants as a control group were $Br{\aa}nemark$ Ti-Unite MK4 (diameter 4.0 mm, length 8.5 mm). Each group was installed in tibia of rabbit. Two implants were placed in each tibia (four implants per rabbit). Test two implants were inserted in right side and control two in left side. ISQ values were measured using $Osstell^{TM}$ (Integration Diagnostics Ltd. Sweden) during fixture installation, and 12 weeks later and evaluated the RFA changes. Results. Mean and SD of baseline ISQ values of test group were $75.0{\pm}3.4$ and $68.7{\pm}8.1$ for control group. Mean and SO of ISQ values 12 weeks after implant insertion were $73.2{\pm}4.7$ for test group and $72.6{\pm}3.9$ for control group. There were no statistically significant differences between groups in ISQ values after 3 months (P>0.05). From the data, RFA gains after 3 months were calculated, and there was statistically significant difference between groups (P<0.05). Conclusion. Although there were RFA changes between groups, implant stability after experimental period shows alike tendency and good bone responses.
Statement of problem. Resonance frequency analysis has been increasingly served as a non-invasive and objective method for clinical monitoring of implant stability. Many clinical studies must be required for standardized data using RFA. Purpose. This study was performed to evaluate RFA value changes in two anodized implant groups. Material and method. Among a total of 24 implants, twelve screw shaped implants as a test group (H2-R8.5) were manufactured, which had a pitch-height of 0.4 mm, an outer diameter of 4.3 mm, a length of 8.5 mm, and external hexa-headed, were turned from 5 mm rods of commercially pure titanium (ASTM Grade IV, Warantec Co., Seoul, Korea), and another twelve implants as a control group were $Br{\aa}nemark$ Ti-Unite MK4 (diameter 4.0 mm, length 8.5 mm). Each group was installed in tibia of rabbit. Two implants were placed in each tibia (four implants per rabbit). Test two implants were inserted in right side and control two in left side. ISQ values were measured using $Osstell^{TM}$ (Integration Diagnostics Ltd. Sweden) during fixture installation, and 12 weeks later and evaluated the RFA changes. Results. Mean and SD of baseline ISQ values of test group were $75.0{\pm}3.4$ and $68.7{\pm}8.1$ for control group. Mean and SO of ISQ values 12 weeks after implant insertion were $73.2{\pm}4.7$ for test group and $72.6{\pm}3.9$ for control group. There were no statistically significant differences between groups in ISQ values after 3 months (P>0.05). From the data, RFA gains after 3 months were calculated, and there was statistically significant difference between groups (P<0.05). Conclusion. Although there were RFA changes between groups, implant stability after experimental period shows alike tendency and good bone responses.
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제안 방법
Secondary implant stability can be increased by bone formation and remodeling at the implant/bone interface. Further investigations using resonance frequency analysis are required to study the structural changed at the implant-tissue interface during healing and the influence of variables including boned quality and quantity. This may enable desirable levels of stability at fixture placement and the degree of healing prior to loading to be established to ensure a successful long-term outcome.
rabbits. The aims of this study were to evaluate the RFA values of two anodized implant groups with different primary stability immediately after implant placement and 12 weeks later.
대상 데이터
6 mature (average age 10 months old weighing 3-3.5kg) New Zealand white rabbits of both sexes were included in this study. Ehiring surgery, animals were anaesthetized with intramuscular injections of Ketamine lO㎎/㎏ (Yu-han Co.
Among a total of 24 implants, twelve screw shaped implants as a test group (H2-R8.5) were manufactured, which had a pitch-height of 0.4 mm, an outer diameter of 4.3 mmz a length of 8.5 mm7 and external hexa-headed, were turned from 5 mm rods of commercially pure titanium (ASTM Grade IVZ Warantec Co., Seoul, Korea), and another twelve implants as a control group were Branemark Ti-Unite MK4 (diameter 4.0 mmz length 8.5 mm). Surface oxides used in the test group were prepared with the use of a DC power supply in electrolyte solution.
데이터처리
One-way analysis of variance (ANOVA) was used for statistical analysis of the data. Differences were considered statistically significant at P<0.
이론/모형
Osstell™ (Integration Diagnostics Ltd. Sweden) was used for implant stability measurements in this study. The transducers were orientated perpendicular to the long axis of tibia and were tightened by hand.
성능/효과
1. There were no statistically significant differences between groups in RFA values after 12 weeks (P>0.05).
2. The RFA gains after 12 weeks were statistically significant difference between groups (P< 0.05). In H2-R8.
8em;">guide. After 12 weeks, there were no significant differences in RFA values between groups, but slight tendency of high level ISQ of H2-R8.5 test groups were expressed.
May be extra ISQ values guide and protect from environmental force. In summary, the results of the present study indicated that all anodized implant surfaces are compatible to the biologic action of bone and above critical level of implant stability, increase or decrease of ISQ value according to conversion from primary stability to secondary stability might be have little significance in implant survival.
후속연구
implant surface.7 However, further research is necessary for the complete characterization of the oxide layer and identification of the optimum conditions for the MAO process.
8-9 However, for the precise evaluation of individual implant stability or comparison with other implants in various clinical conditions, standardized baseline data using RFA are urgently required.10 Therefore, more clinical studies are needed to elucidate resultant implant stabilities in such specific conditions as identification of implant status at risk for implant failure, individualization of healing periods after implant placement and so on.
참고문헌 (11)
Albrektsson T, Branemark PI, Hansson HA, Kasemo B, Larsson K. The interface zone of inorganic implant in vivo ; Titanium implants in bone. Ann Biomed Eng 1983;11:1-27
Kasemo B, Lausmaa J. Aspect of surface physics on titanium implants. Swed Dent J 1983;28(Suppl.):19-36
Zitter H, Plenk HJ. The electrochemical behavior of metallic implant materials as indicator of their biocompatibility. J Biomed Mater Res 1987;21:881-896
Solar RJ, Pollack SR, Korostoff E. In vitro corrosion testing of titanium surgical implant alloys: an approach to understanding titanium release from implants. J Biomed Mater Res 1979;13:217-250
Sul YT, Johansson CB, Jeong YS, Albrektsson T. The electrochemical oxide growth behavior on titanium in acid and alkaline electrolytes. Med Eng and Phys 2001;23:329-46
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