Finite Element Stress Analysis Of Different MOD All-ceramic Inlay After Root Canal Treatment Of Mandibular Second Molars

Objective:To establish the finite element model of MOD cavity inlay with different widths of mandibular second molar after root canal treatment and analyze the stress,we explored the optimal structure of MOD inlay design with different widths,so as to provide theoretical reference for clinical inlay optimization design.Method:The three-dimensional finite element method was used to analyze the stress distribution of all parts of all ceramic inlay and onlay under the same load.Results:1.When the width of MOD is 1/3 of buccal lingual diameter,the stress level under vertical load:inlay(1M1)<onlay(1M2)<onlay(1M3)<onlay(1M4).The stress distribution trend of the lingual to 45 degrees is the same as the vertical load.2.When the width of MOD is 1/2 of buccal lingual diameter,the stress level under vertical load:inlay(2M0)>onlay(2M1)>onlay(2M3)>onlay(2M4)>onlay(2M2);the stress level under the load of lingual to 45 degrees:inlay(2M0)>onlay(2M1)>onlay(2M2)>onlay>onlay(2M4).3.When the width of MOD is 2/3 of buccal lingual diameter,the vertical load and the stress level of lingual to 45 degree load are:inlay(3M0)>onlay(3M1)>onlay(3M2)>onlay(3M3)>onlay(3M4).Conclusions:l.When MOD width is buccal lingual diameter 1/3,inlay was an optimal option.2.When MOD width is buccal lingual diameter 1/2,palatal cusps reducation was revealed as an optimal option.3.When the width of the buccal lingual is 2/3,covering the entire cusps was revealed as an optimal option.lt could be suggested for revealing lower stress values in dental tissue and restorative material.This type of cavity design should contribute to better biomechanical behavior of tooth-restoration complex.