Abstract: Objective　To study the stress distribution of cylindrical implants and conical implants at different implant depths in jaw by using three-dimensional finite element method. Methods With Astra Tech Osseo SpeedTM5.0sTX as reference, Solidworks software was used to simulate and establish the bone models of cylindrical implant and conical implants, abutments and crowns, respectively. The bone models were imported into abaques finite element software, and the force of 45 °180N was obliquely loaded on the crown. The Von-mises stress distribution of cylindrical implants and conical implants at different planting depths was analyzed. Results Under 45 °180N load, the maximum stress of cylindrical implants and conical implant appeared at the junction between implant and abutment. With the increase of implant depth in alveolar bone, the stress distribution range of both implants increased, and under the same load, the distribution of stress in conical implant was smaller than that in cylindrical implant. Conclusion Considering the shape and depth of implant, the stress of conical implant is smaller than that of column implant, so too deep planting should be avoided when implanting.

Key words: cylindrical implants, conical implants, implant depth, three-dimensional finite element , stress