This work presents a finite element analysis of the stress distribution in teeth restored by single all-ceramic crowns with different types of finishing lines. In order to obtain the 2-D numerical model, three models of the mandibular molar teeth region were created considering a real anatomic piece and were then used to simulate the application of all-ceramic crowns with different finishing lines on the second molar. The selected material for the restorations was a ceramic material reinforced by lithium disilicate and the finishing lines adopted were shoulder, rounded shoulder and chamfer type. Aiming to realize a more careful analysis of the stress distributions associated with the different finishing lines, the same model was created in a completely healthy condition, i. e., in the absence of any kind of restoration. The numerical simulation was carried out by the ANSYS 7.0 software loading the models with 400 N distributed by the teeth thickness and applied according to the cusp-crest relationship at points in the teeth oclusal surfaces. The vectors corresponding to the applied forces were oriented towards the former-inferior mandibular region at the angle of 15o. The results indicated that the restoration involving the all-ceramic crown with the shoulder type finishing line intensified the stress in the restored molar tooth, followed by the all-ceramic crown with the rounded shoulder. On the other hand, the all-ceramic crown with the chamfer type finishing line caused a more homogeneous stress distribution in the restored molar tooth.