Abstract
Although it is recommended that the connection between the bone-binding implant and the natural tooth should be avoided as much as possible, occasionally the connection there of cannot be completely avoided in routine clinical settings. In this study, cases were clinically assessed, in which the bone-binding implant was connected to the natural tooth,and in which 5 years or more had passed since the framework was mounted on the base components.
1) The subjects were 56 patients seen from 1986 to 1994, in whom the bone-binding implant was impacted and the framework was mounted on both the natural tooth and the implant. The materials consisted of 70 impacted implant fixtures, 96 natural teeth, and 62 mounted frameworks.
2) Complications consisted of fracture of the tooth root (n=4), secondary caries (n=1), submerged natural tooth (n=2), bone absorption of the implant neck (n=4), and fracture of the implant body (n=1).
3) Complications were encountered in 12 of the 56 patients (21%). One of the submerged natural teeth was preserved, and the fractured implant body was removed.
The above findings suggested that complications associated with the connection between the implant body and the natural tooth may occur more frequently in the natural tooth than in the implant body, and sometimes lead to complications such as tooth extraction.
