The evolution of dental implants 141

Fig. 5-8. Two kinds of screw implants were used in this Strock case. A, The first implant, which was quickly removed because of extreme looseness. B, The edentulous area after the implant was removed. C, Another implant inserted in the same site. D and E, A central incisor to be replaced by a new type of post. F to H, Results obtained with this post. The post remained in place up to 6 rnonths later. However, little or no bone repair is seen. (From Strock, A. E.: Experimental work on a method for the replacement of missing teeth by direct implantation of a metal support into the alveolus, Amer. J. Orthodont. 25:467-472, 1939.)