Analysis Occlusion Of Different Prosthesis For Kennedy Ⅱ Patients With T-ScanⅢ System

ObjectiveTo investigate the occlusal force distribution after three prosthesis forrestoration of kennedy Ⅱ patients and different from the natural tooth.Toprovide the theory basis of occlusal force distribution for the decision of clinicalrestoration design method．MethodsThe experimental group was KennedyⅡ patients who were treated in thedepartment of stomatology, of the Second Artillery General Hospital of ChinesePLA．They were divided into three groups according to different prosthesis，removal partial denture(RPD) group (12cases)，implant group(12cases)，precision attachments group(12cases)．The control group were volunteerswith complete and normal dentition(12cases)．T-ScanⅢ system was used totest the occlusal force distribution in the wearing tooth day,six months and oneyear after restoration．Results1Compared to the day in restoration，the general occlusion force and thehorizontal displacement of center of force and the displacement of anterior toposterior direction in RPD group had no significant difference after6months(P﹥0.05).But there was significant difference in the general occlusion force andhorizontal displacement of center of force and displacement of anterior toposterior direction after12months(P﹤0.05).2Compared to the day in restoration，the general occlusion force and thehorizontal displacement of center of force in precision attachments group had no significant difference after6months(P﹥0.05)，however，the displacement ofanterior to posterior direction in precision attachments group had significantdifference after6months(P﹤0.05)．The horizontal displacement of center offorce in precision attachments group had no significant difference after12months(P﹥0.05)，but the general occlusion force and the displacement ofanterior to posterior direction in precision attachments group had significantdifference after12months(P﹤0.05)．3Compared to the day in restoration，the general occlusion force and thehorizontal displacement of center of force and the displacement of anterior toposterior direction in implant denture group had no significant difference after6months and12months(P﹥0.05)．4Compare to control group，the general occlusion force of RPD group hadsignificant difference at the day in restoration(P﹤0.05)，the general occlusionforce of the precision attachments group and implant denture group had slightlylow，but there were no significant difference from control group(P﹥0.05);Thehorizontal displacement of center of force in RPD group was higher than controlgroup，there had significant difference from control group(P﹤0.05)，but theprecision attachments group and implant denture group had no significantdifference from control group(P﹥0.05);The displacement of anterior to posteriordirection in RPD group and implant denture group and precision attachmentsgroup were lower than control group，there had significant difference fromcontrol group(P﹤0.05)．5Compare to control group，the general occlusion force of RPD group hadsignificant difference after6months(P﹤0.05)，the general occlusion force of theprecision attachments group and implant denture group had lower than controlgroup，but there were no significant difference from control group(P﹥0.05);Thehorizontal displacement of center of force in RPD group was higher than controlgroup， there had significant difference from control group(P﹤0.05)， theprecision attachments group and implant denture group had no significantdifference from control group(P﹥0.05)，but there had significant difference between precision attachments group and implant denture group(P﹤0.05);Thedisplacement of anterior to posterior direction in RPD group and implant denturegroup had significant difference from control group(P﹤0.05)，but there had nosignificant difference in precision attachments(P﹥0.05)．6Compare to control group，the general occlusion force of RPD group andprecision attachments group had significant difference after12months(P﹤0.05)，the general occlusion force of the and implant denture group had nosignificant difference from control group(P﹥0.05);The horizontal displacementof center of force in RPD group and precision attachments group was higherthan control group，there had significant difference from control group(P﹤0.05)，however，the implant denture group had no significant difference from controlgroup(P﹥0.05);The displacement of anterior to posterior direction in RPD groupand implant denture group had higher and significant difference from controlgroup(P﹤0.05)， but there had no significant difference in precisionattachments(P﹥0.05)．Conclusions1Precision attachments denture could get occlusion balance indisplacement of anterior to posterior direction．2Implant dentures were better than RPD and precision attachmentsdenture in recovering the occlusal force and controlling the horizontaldisplacement of center of force，it closed to normal occlusal force distribution．3T-ScanⅢ system was used to test the occlusal force distribution afterthree prosthesis for restoration of kennedy Ⅱ patients， the subject hadguiding value for clinical restoration designing．...