Deformation at the implant interface to prosthetic superstructure: an interferometric approach.
Dental implants are deformed by masticatory forces. These deformations may affect the implant, the prosthetic superstructure or, in particular, the interfaces between the implant and the superstructure. The resulting changes in the geometrical relationships may lead to gap formation in this region. The objective of the present pilot study was to present an interferometric method for the direct recording and quantitative three-dimensional analysis of load-induced dynamic implant deformation. Three implant screws of 4.1 mm diameter were loaded using a piezoelectric device. The results showed that the screws itself exhibited a homogeneous deformation pattern, whereas implants with screw-retained superstructures demonstrated dislocations of the crown and resulting gap formations (0.27 +/- 0.37 microm--mean +/- SD; max: 0.82 microm). The results supported the hypothesis that the high precision of prefabricated abutments is adversely affected by dynamic deformations under functional loading.
Department of Oral Surgery, University of Bonn, Bonn, Germany. g.wahl@uni-bonn.de
Gerhard
G
Wahl
Hermann
H
Lang
D000704:Analysis of Variance; D001732:Bite Force; D003442:Crowns; D000044:Dental Abutments; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D003763:Dental Leakage / Q000209:etiology; D017268:Dental Prosthesis Retention / Q000295:instrumentation; D019094:Dental Prosthesis, Implant-Supported / Q000009:adverse effects; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D007368:Interferometry; D013314:Stress, Mechanical
D015921:Dental Implants