Investgating Implant Stability Parameters with Different Implant Macrodesign in Sawbone Blocks
Date Issued
2015
Date
2015
Author(s)
Fan, Hsin-Yuan
Abstract
Research goal The purpose of this study was to investigate the correlation between implant macrodesign with implant insertion torque, implant stability quotient, periotest value and implant micromotion in artificial bone blocks of different densities. Material and method 1. Sawbone blocks (30mm x15mm x25mm) were fabricated by combining with or without the 1mm 50 pounds per cubic foot (pcf) short fiber filled epoxy sheet on 10- or 20-pcf (density: 0.16, 0.32 g/cc) polyurethane foam test blocks, four combination blocks were used: 10pcf, 20pcf, 1+10pcf and 1+20pcf. 2. Three types of implant macrodesign (Nobel Biocare AB, Göteborg, Sweden) were used in this study: Nobelbiocare MKIII (4.0mm x 10mm; ø x length), MKIV(4.0mm x 10mm; ø x length) and NobelActive (4.3mm x 10mm; ø x length) implants. 3. Implant site preparations were performed according to manufacturer’s instruction: MK III and MK IV by step drilling with 2-mm, 2.4/2.8-mm, 3-mm drill in 10 mm depth, Counterbore drill was extra used with laminated sawbone blocks. NobelActive with final drill 3.2-mm in 10mm depth. 4. MK III, MK IV, NobelActive implants were inserted into sawbone blocks by hand torque wrench and peak insertion torque (PIT) and final insertion torque (FIT) were recorded. 5. ISQ was recorded with Osstell® ISQ (Integration Diagnostics, Göteborg, Sweden) by connecting implant with a smart peg; 6. Periotest value was recorded with Periotest® (Siemens AG, Bensheim, Germany) by connecting implant with a 5-mm healing abutment. 7. Bone block was then fixed in the vehicle, and lateral force applied to the top of 5 mm healing abutment by a Dynamic Loading Machine (Advance Instrument Inc., Taiwan), and micromotion was measured using [micro miniature LVDT (Linear Variable Differential Transformer), Singer Instruments & Control Ltd, Israel] at the opposite side of the healing abutment. Results: (1) In the same implant macrodesign, insertion torque and ISQ increased with the thickness of the cortical layer and the density of cancellous bone; on the contrast, Periotest value decreased. This trend can be observed in all three types of implant design. (2) In the medium density bone block which including 1+10pcf and 20pcf, insertion torque among three type of implant design had siganificant difference; ISQ among MKIII and MKIV implant had siginificant difference; PTV among three types of implant had no significant difference; and the micromotion between MKIII and MKIV, MKIII and NobelActive had significant difference. (3) With the bone block and the drilling protocol we used in this study, the three types of implant design had their insertion torque negatively related to micromotion; ISQ negatively related to micromotion; and Periotest value positively related to micromotion. Conclusion: (1) IT, ISQ, PTV and implant micromotion were affected by bone density. (2) Based on the same bone quality and drilling protocol, MKIV implant had the lowest implant micromotion among the three implant designs. (3) Under the bone quality and drilling protocol used in this study, IT and ISQ be negatively correlated with implant micromotion; PTV be positively correlated with implant micromotion.
Subjects
immediate loading
implant stability
micromotion
Type
thesis
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