Analysis Of Mandible Angle After Repair Abutment Tilted Implant Bone Interface Biomechanical Finite Element Under Different Stress Conditions

Objective: After observing and analyzing the missing teeth in the mandibular posterior area,the tilting planting method was combined with the angle abutment and the crown optimization treatment for the limitation of bone condition.In the tilt direction and angle under different simulation in a different force chew three stages period(the stress points and different direction),observe the implant bone interface stress and strain changes,for the clinical design and implementation of mandible inclined planting can provide a theoretical reference for.Method: Select the CBCT scan data of single molar of mandible in healthy adults,the establishment of a joint application of various software: four different directions of implant biased lingual,buccal side,Kon Naka,far,tilt angle of 5 degrees,10 degrees,15 degrees and 20 degrees,including implant abutment angle,crown,mandibular prosthesis model is applied in a molar masticatory cycle dynamic stress load in the simulation model,using finite element analysis method of implant bone interface biomechanical analysis.Result: 1.The experiment showed that the strain and stress of the mandible fluctuated with the increase of inclination angle when the tongue side of the implant was tilted.Under the third stress state of the chewing cycle,the strain and stress fluctuate with the increase of the angle of the tilt.The 5 and 10 degrees of strain of the tongue are all within the normal range.When the inclination angle of the implant is 15 degrees,the strain and stress change are formed,the maximum is 4289 micro strain and the maximum stress is 124.54 MPa.2.This experiment shows that the strain and stress of the mandible fluctuate with the increase of the angle of the tilted implant when the implant is tilted on the cheek.Under the third stress state of the chewing cycle,the strain and stress fluctuate with the increase of the angle of the tilt.The strain of the buccal side is 5 and 10 degrees,and the strain is within the normal range.When the tilt angle is 15 degrees,the mutation is formed,and the maximum strain at this time is 6179 micro strain and the maximum stress is 72.6MPa.3.The experiments show that when the tilted implant distal,three in the stress state of the chewing cycle,increasing the strain and stress of mandible with inclination angle increases;and,more than 15 degrees in the tilt angle,the strain and stress increases with the increase of the tilt angle is more significant in chewing;third periodic stress state,strain with inclination angle increased with the increasing of more significant.The maximum strain and stress are 4455 micro strain and the maximum stress 86.84 MPa in third stress states when the inclination angle of the implant is 20 degrees.4.The experiment showed that the tilted implant near when,in three the stress state of the chewing cycle,increasing the strain and stress of mandible with inclination angle increases;and,more than 15 degrees in the tilt angle,the strain and stress increases with the increase of the tilt angle is more significant in chewing;third periodic stress state,strain and stress with increasing tilt angle increasing trend is more obvious.The maximum strain and stress are 4441 micro strain and the maximum stress 47.17 MPa in third stress states when the inclination angle of the implant is 20 degrees.5.When the oblique loading is loaded,the maximum stress area is close to the direction of the loading force.6.The experimental results showed that the stress and strain of the mandible were significantly increased in the third stress state of the chewing cycle,compared with the first two stress states.Conclusion: The accurate expression of the mandible of this complex geometry,to simulate the load condition of a chewing cycle is complex,in the restoration model of cortical bone,cancellous bone,implant,abutment and crown materials of different nature of integrated mechanical analysis.When the tilting is planted at 15 degrees,the strain of the cancellous bone exceeds the permitted value.When the mandibular stress does not exceed the allowable stress of the bone,the strain of the mandible may exceed the allowable strain value.At this time,there will be pathological changes in bone tissue,and there will be bone resorption.Therefore,for tilted planting,not only should the stress be taken into account that the maximum allowable stress of the mandible should not be exceeded,but also the effect of strain should also be considered.The analysis of the model shows that it can be planted near the middle and far middle,of the mandibular posterior region within 10 degrees,and it can be planted on the lingual and buccal side..The results showed that when mandibular tilting was planted,whether the tongue was buccal or tilted to the far side,the strain and stress of mandible had the same trend.In actual operation,the direction of inclination should be chosen according to the anatomical conditions of the patient.