科研之友
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摘要
To determine if acrylic or composite resins are favorable choices for the single crown on implants. It was performed a FE Analysis using the IBM Autodesk Inventor 2014 for a single 3.75x8mm mandibular implant, a straight titanium abutment, three crowns (acrylic, metal-composite and metal-ceramic) and a type III bone with a I mm cortical component. For the implant, the maximum stress was 178.7MPa (acrylic crown), 96.38MPa (metal-composite crown) and 86.17MPa (metal-ceramic crown). For the abutment, the maximum stress was 312.4MPa (acrylic crown), 140.8MPa (metal-composite crown), and 121.5MPa (metal-ceramic crown). For the retainer screw, the maximum stress was 75.67MPa (acrylic crown), 33.66MPa (metal composite crown), and 34.64MPa (metal-ceramic crown). For the metallic component of the crown, the maximum stress was 248.7MPa (metal-composite crown), and 207.1MPa (metal-ceramic crown). For the aesthetic component of the crown, the maximum stress was 28.93MPa (acrylic crown), 22.45MPa (metal composite crown), and 28.13MPa (metal-ceramic crown). For the cortical bone, the maximum stress was 62.74MPa (acrylic crown), 37.63MPa (metal-composite crown), and 40.3MPa (metal-ceramic crown). For the trabecular bone, the maximum stress was 7.147MPa (acrylic crown), 4.995MPa (metal-composite crown), and 4.973MPa (metal-ceramic crown). For the metal-composite crown, the stress distribution in the trabecular bone is more uniform, comparing to the acrylic crown, which is an advantage. For the metal ceramic crown the stress distribution in both bone components is similar as for metal-composite crown. The safety factor shows that there is no risk of plastic deformation, nor for acrylic or for the composite resins. The composite resin on Cr-Ni alloys is still the best material for the single implant crown. The acrylic resin and ceramics on Cr-Ni alloys proved a similar resistance to stresses.
- 出版日期2015-12
