Details

Autor(en) / Beteiligte

• Nishimura, Russell D.
• Ochiai, Kent T.
• Caputo, Angelo A.
• Jeong, Chang Mo

Titel

Photoelastic stress analysis of load transfer to implants and natural teeth comparing rigid and semirigid connectors

Ist Teil von

• The Journal of prosthetic dentistry, 1999-06, Vol.81 (6), p.696-703

Ort / Verlag

United States: Mosby, Inc

Erscheinungsjahr

1999

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• Statement of problem. Controversy exists regarding the connection of implants to natural teeth. Purpose. This simulation study measured photoelastically the biologic behavior of implants. Stress transfer patterns with variable implant support and simulated natural teeth through rigid and nonrigid connection were examined under simulated functional loads. Material and methods. A photoelastic model of a human left mandible edentulous distal to first premolar was fabricated having 2 screw type implants (3.75 × 13 mm) embedded within the edentulous area. Two fixed prosthetic restorations were fabricated with either a nonsplinted proximal contact or a soldered proximal contact, and cast precision dowel attachment between implant areas and simulated tooth. Simulated vertical occlusal loads were applied at fixed locations on the restorations. Stresses, which developed in the supporting structure, were monitored photoelastically and recorded photographically. Results. The rigid connector in the 1 implant situation caused only slightly higher stresses in the supporting structure than the nonrigid connector. The distally loaded 1 and 2 implant-supported restoration produced the highest apical stresses, which occurred at the distal implant. The rigid connector demonstrated the greatest stress transfer in the 2 implant-supported restoration. Conclusions. Lower stresses apical to the tooth or implant occurred with forces applied further from the supporting abutment. Although the least stress was observed when using a nonrigid connector, the rigid connector in particular situations caused only slightly higher stresses in the supporting structure. The rigid connector demonstrated more widespread stress transfer in the 2 implant-supported restoration. Recommendations for selection of connector design should be based on sound clinical periodontal health of a tooth and the support provided by implants. (J Prosthet Dent 1999;81:696-703.)