Evaluation of the accuracy of internal and marginal surfaces of metal copings manufactured using selective laser melting and lost-wax casting methods

Results:The mean root mean square (RMS) values of trueness of the internal and marginal surfaces in the LWC method were 37.121.21and 59.924.48m, respectively, which were higher than the values of 20.731.07 and 44.612.67 m, respectively, in the SLM method, with the difference being statistically significant (p<0.001 and p=0.023, respectively).The internal surface mean RMS values of precision in the LWC and SLM groups were 22.392.87and 21.161.25 m, respectively, which showed no statistically significant difference (p=0.872);however, the marginal surface mean RMS values were 50.972.24and 22.111.19m, respectively, indicating a statistically higher precision in the SLM group (p<0.001). Conclusion:The internal and marginal surfaces of metal copings manufactured using LWC and SLM methods showed significantly different accuracy, except for internal surface precision.Both methods yielded clinically acceptable values.