| Objective: After more than half a century of development and maturation,implanting prosthesis has become a conventional treatment method in oral clinical medicine.The titanium metal material with good biocompatibility and biomechanical compatibility is widely used in the production of dental implants and abutments,but in which patients with thinner gum or higher implant shoulder position,the aesthetic effect will be weakened due to exposure of metal color produced by titanium material and gingival stain caused by precipitation of titanium ion.In numerous porcelain material,because of good biocompatibility,mechanical performance superior to the traditional feldspar porcelain and alumina,etc,ZrO2 ceramic becomes more and more popular.ZrO2 abutments can improve aesthetic effect more obviously.But compared with titanium material,ZrO2 ceramic for higher brittleness and poor toughness,shows fracture phenomena.In order to achieve outstanding functional and cosmetic results,bone-level pure titanium implants and ZrO2 abutments are fabricated in this study to investigate overall fracture resistance of ZrO2 aesthetic abutments to provide experimental reference and theoretical basis for its clinical application,in which a static load was applied to the specimens using a universal testing machine.Methods:1 Sample preparation12 pieces of bone level pure titanium implants with a diameter of 4 mm and a length of 12 mm are manufactured in Hebei Xinhua oral technology co,LTD.6 pieces of bone-level ZrO2 abutments with a 5 mm diameter and a length of 7.9mm are manufactured in Shan dong Xinhua oral technology co,LTD.6 pieces of bone-level titanium abutments with a 5 mm diameter and a length of 7.9mm are manufactured in Hebei Xinhua oral technology co,LTD.12 pieces of pure-titanium central screw with a diameter of 1.4 mm are manufactured in Hebei Xinhua oral technology co,LTD.12 stainless-steel metal cap with a diameter of 6.5 mm are manufactured in Shandong Xinhua oral technology co,LTD.Stainless steel clamp and loading head are manufactured in Hebei Xinhua oral technology co,LTD.2 Assembling of specimensAll abutments with an external hexagon were fixated on the pure-titanium implants with pure-titanium screws at 30 Ncm torque and metal crowns were adhesively cemented onto the abutments.3 DivisionGroup A Pure titanium implant+Zirconium abutment+Metal capGroup B Pure titanium implant+Titanium abutment+Metal cap4 Detection of fracture resistanceISO 14801:2007 specifies a method of fatigue testing of single post endosseous dental implants of the transmucosal type and their premanufactured prosthetic components,which simulates the functional loading of an endosseous dental implant body and its premanufactured prosthetic components under “worst case” conditions.This experiment applied a perpendicular load to the angulated specimens under a crosshead speed of 1 mm/min to measure the fracture resistance of ZrO2 abutments（loading speed of 1 mm/min）.Two set of data were analyzed statistically with SPSS19.0 software.Results:Fracture resistance of two groups are showed in the form of （?）±s,within which fracture resistance of ZrO2 abutments are 450.96±13.12 N,fracture resistance of pure-titanium abutments are 533.65±9.29 N.A significant difference（P<0.05）can be observed between the two groups,in which fracture resistance of pure-titanium abutments are higher.Conclusions:1 Fracture resistance of pure-titanium abutments are higher than ZrO2 abutments.2 Fracture resistance of ZrO2 abutments can be capable of withstanding physiological occlusive loading.3 ZrO2 abutments is a preference in the aesthetic implanting prosthesis,which can improve aesthetic effect more obviously. |
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