European Journal of Prosthodontics and Restorative Dentistry

Effect of Implant Position and Attachment Type on the Biomechanical Behavior of Mandibular Single Implant Prostheses


This study aimed at evaluating different implant positions and attachment systems for mandibular single implant prostheses (MSIP) with respect to loading of bone and prosthesis displacement. A model with three interforaminal implants served as a basis. Four prostheses differing in the attachment type used (ball anchor, locator, rigid telescopic crown, non-rigid telescopic crown) were fabricated. During occlusal loading, the prostheses were either supported by a midline implant, the left canine implant or the two canine implants. Strain and displacement measurements conducted during loading were quantitatively compared. In general, molar loading led to high levels of prosthesis displacement while loading in the incisor area caused higher strains at the supporting implants and unilateral loading led to an unequal distribution of strains. Using the canine implant instead of the midline implant for support resulted in greater magnitude
and disparity of loading while the use of two implants had no clear advantage. The use of telescopic crowns led to inconsistent results. None of the attachments seems to be ideal as they all transferred strain to the supporting implant. In particular, the unequal distribution of strain indicative of moment loading is of concern. An alternative attachment system with a consistent cushioning effect seems desirable.

Strain Gauge
Mandibular Single Implant Prosthesis
Attachment Type
Prosthesis Displacement


Tanja Grobecker-Karl, Lea Kafitz, Matthias Karl

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