Biomechanical Properties Of New Bones Which Guided By Different Materials In Different Periods

Bjective: Implant Restoration has become a popular way to repair clinicalmissing teeth. The primary factor in implant is the conditions of the bone ingrowing areas, but most situation was that didn’t have enough bone. In recentyears, there are lots of researches of Guided bone regeneration(GBR) at homeand abroad, and the osteogenic effect of GBR has been widely recognized. Butstudy of the biomechanical properties of new bones which guided by thistechnology is seldom. So this experiment will research the biomechanicalproperties of guided bones to conclude the quality and density. And guiding theclinical to select the graft material and planting time.Methods:12adult Beagle dogs as the object, In its bilateral femoral condyleprepared3cylindrical defects,3mm diameter,10mm height. Do GBR surgery,implant bio-oss(group B),β-TCP(group C) and autogenous bone(group Z),coverthe bio-membrane. Sacrifice6dogs in each three and six months after surgery,preparation specimens. Some do CBCT scanning,observe the situations ofbone formation. Some do compression test, detect the ability of compression ofguided bone. Some do implant surgery, detect immediate torque. And some dopush-out test, detect binding ability between new bone and natural bone.Results: We have successfully established animal models. CT displayed thatevery group have osteogenesis, and6-mouth groups are better than3-mouth groups. Compression test:6-mouth groups are better than3-mouth groups,group Z>group B>group C in3-mouth groups, group Z>group C and groupB>group C in6-mouth groups. Immediate torque test: group Z>group C andgroup B>group C in either3-mouth groups or6-mouth groups, only the averagetorque of group C in3-mouth groups is lower than30N/cm,others are all higherthan30N/cm. Push-out test:6-mouth groups are better than3-mouth groups, andgroup B>group C.Results: Compared the new bones guided by bio-oss and β-TCP, found thatbio-oss was better than β-TCP in compressive strength, could provide betterprimary stability in plant, and had superiority in ability of combined withnatural bone.