Original study - ZZI 04/2011

Implant-retained prostheses: ball vs. conus attachments – A randomized controlled clinical trial

Patient satisfaction increased clearly due to reconstruction with a mandibular overdenture retained on two implants. This result is in line with other studies [2, 3, 5, 10, 12, 17, 25, 44]. In addition, it was found that more patients were satisfied with reconstruction by ball heads than when prefabricated conical crowns were used. This might be attributable to difficulties in adjusting retention and the associated extra effort required with the prefabricated conical crowns.

However, a criticism of this is that patient satisfaction was surveyed by a single global question. No sub-variables were investigated. Batteries of questions consisting of several individual questions [36] in combination with rating (Likert) scales or visual analogue scales (VAS) would have been useful (VAS) [22]. This would have allowed differentiation between different aspects of satisfaction [16].

Both of the types of abutment studied proved to be retention elements for economical restoration of the edentulous mandible with an implant-retained overdenture that require intensive maintenance. While other studies [8, 21] demonstrated good results in the restoration of edentulous mandibles with four SynCone abutments, restoration with two SynCone abutments for retention of a mandibular overdenture offers no advantages compared with ball heads and is therefore not recommended. Regarding the present study, it must be commented that the small size of the two study groups can be regarded critically with regard to the interpretation of the results.


Approvals: this study was approved by Freiburg Regional Council. This study was approved by the Ethics Committee of Freiburg University Hospital (decision number 105/04).

Conflict of interests: This study was supported financially by DENTSPLY Friadent (contract ZVS 20050426).

Correspondence address

Dr. Sandy Cepa

Abteilung für Zahnärztliche Prothetik

Universitätsklinikum für Zahn-, Mund- und Kieferheilkunde

Klinikum der Albert-Ludwigs-Universität Freiburg

Hugstetter Straße 55

79106 Freiburg i. Br.

E-mail: sandy.cepa@uniklinik-freiburg.de


1 Department of Dental Prosthetics, University Oral and Dental Medicine Clinic, Albert Ludwig University Freiburg Clinic

2 Medical Biometrics and Medical Informatics Institute, Albert Ludwig University Freiburg

Übersetzung: LinguaDent

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