A 5‐year prospective clinical study of Astra Tech dental implants supporting fixed bridges or overdentures in the edentulous mandible

Abstract

In a 5-year prospective clinical study, 155 endosseous implants were installed in the mandible anterior to the mental foramina in 33 edentulous patients (13 males and 20 females). Usually 6 implants were installed for fixed prostheses (FP), 13 patients with 77 implants, and 4 implants for overdentures (OD) with a Dolder bar, 20 patients with 78 implants. At the time of abutment connection 1 implant in 2 patients was found to be loose and removed. However, in both these patients overdentures were successfully placed on the remaining 3 implants. Narrow-beam radiography was used for radiological evaluation. The mean (SD) total marginal bone loss in 5 years was 0.48 (0.38) mm (0.36 (0.22) mm in the FP group and 0.56 (0.45) mm in the OD group). Very few complications were reported during the 5 years, most of them being related to the superstructures. The overall cumulative implant survival rate was 98.7% (100% in the FP group and 97.4% in the OD group). The survival rate of the superstructures was 100%. The present study has demonstrated that Astra Tech implants offer reliable and predictable medium-term support for fixed prostheses and overdentures in the edentulous mandible.

Implant‐supported cantilevered fixed dental rehabilitations in fully edentulous patients: Systematic review of the literature. Part II

“…Agliardi, Romeo, Panigatti, de Araújo Nobre, and Maló (2017) Lambrecht, Filippi, Künzel, and Schiel (2003); Davis, Packer, and Watson (2003); Weng et al (2003); Attard and Zarb (2003); Brosky, Korioth, and Hodges (2003); Naert et al (2002); Fortin, Sullivan, and Rangert (2002); Wyatt and Zarb (2002); Attard and Zarb (2002); Zarb and Zarb (2002); Ferrigno, Laureti, Fanali, and Grippaudo (2002); Sullivan, Sherwood, and Porter (2001); Ekfeldt et al (2001); Hellem et al (2001); Merickse-Stern, Aerni, Geering, and Buser (2001); Allen, McMillan, and Walshaw (2001); Vajdovich and Fazekas (1999); Noack, Willer, and Hoffmann (1999); Schliephake, Schmelzeisen, Husstedt, and Schmidt-Wondera (1999); Chaushu and Schwartz-Arad (1999); Makkonen et al (1997); Zarb and Schmitt (1993) Same pool of patients of other article Cavalli, Corbella, Taschieri, and Francetti (2015); Fischer, Stenberg, Hedin, and Sennerby (2008) TA B L E 2 Study and patient characteristics of the included studies (full-arch prostheses) 3. High risk of bias (plausible bias that seriously weakens confidence in the results) if one or more criteria were not met.…”

A prospective, multi‐center study assessing early loading with short implants in posterior regions. A 3‐year post‐loading follow‐up study

“…As no hypothesis was planned to be tested, a formal sample size calculation was not performed. However, based on earlier studies 16,23 it was estimated that 15 patients in total (5 in each center) should be enough to study changes over the time from baseline until consecutive visits. To further increase the precision of the studied variables and to compensate for possible patients dropping out during the long-term follow-up, it was decided to recruit 15 patients per center, a total of 45 subjects in the study.…”

Evaluation of an Endosseous Oral Implant System According to UNI EN ISO 14801 Fatigue Test Protocol

“…In fact, various experimental studies have shown that the mechanical integrity of the implantabutment unit and the stability of the joint vary significantly depending on the interface design and the tightening force. [5][6][7] Nevertheless, the external hexagonal system remains the dominant implant design in the European market, probably because of its extensive use, wide range of clinical applications, and the massive efforts that have been made to find solutions to the various complications reported within its use. Butt-joint models include "external" or "internal" types, depending on whether the interface geometric antirotational component protrudes beyond the implant surface or is internal to the structure, respectively.…”