Statement of problem. Information regarding the merits and problems associated with connecting a keeperto a dowel and coping using a laser welding technique has not been explored extensively in the dental literature.Purpose. This in vitro study compared the surface characteristics, microstructure, and magnetic retentive forcesfor a dowel and coping-keeper mechanism fabricated using a laser welding process and a cast-to castingtechnique.Material and methods. Five cast-to and 6 laser-welded dowel and coping-keeper specimens were tested.Using 5 freestanding keepers as the control group, the surface characteristics and microstructures of thespecimens were examined by means of stereomicroscopy, metallographic microscopy, and scanning electronmicroscopy (SEM). Energy-dispersive spectroscopic (EDS) microanalysis with SEM provided elementalconcentration information for the test specimens. The vertical magnetic retentive forces (N) of the 3 groupswere measured using a universal testing machine. The results were statistically compared using 1-way analysis ofvariance and the Newman-Keuls multiple range test (a=.05).Results. The laser-welded dowel-keeper generally maintained its original surface smoothness as well as theoriginal microstructure. Elements diffused readily through the fusion zone. The surface of the cast dowel-keeperbecame rough with the formation of an oxide layer, the microstructure changed, and there was only limitedelemental diffusion in the fusion zone. The average vertical magnetic retentive force of the laser-welded group,the cast group, and the control group were 4.2 6 0.2 N, 3.8 6 0.3 N, and 5.6 6 0.3 N, respectively. Statisticallysignificant differences in vertical magnetic retentive force were found between the control group and both thelaser-welded and cast groups (P,.01). Compared with the cast dowel-keepers, the average vertical magneticretentive force of the laser-welded dowel-keepers was significantly higher (P,.05).Conclusion. The laser welding technique had less influence on the surface characteristics, the microstructure,and the magnetic retentive forces of keepers relative to techniques that incorporate a keeper at the time of castdowel and coping fabrication.