Complications with computer-aided designed/computer-assisted manufactured titanium and soldered gold bars for mandibular implant-overdentures: short-term observations

Katsoulis, Joannis; Wälchli, Julia; Kobel, Simone; Mericske, Regina (2015). Complications with computer-aided designed/computer-assisted manufactured titanium and soldered gold bars for mandibular implant-overdentures: short-term observations. Clinical implant dentistry and related research, 17(Suppl 1), e75-85. Blackwell 10.1111/cid.12130

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BACKGROUND Implant-overdentures supported by rigid bars provide stability in the edentulous atrophic mandible. However, fractures of solder joints and matrices, and loosening of screws and matrices were observed with soldered gold bars (G-bars). Computer-aided designed/computer-assisted manufactured (CAD/CAM) titanium bars (Ti-bars) may reduce technical complications due to enhanced material quality. PURPOSE To compare prosthetic-technical maintenance service of mandibular implant-overdentures supported by CAD/CAM Ti-bar and soldered G-bar. MATERIALS AND METHODS Edentulous patients were consecutively admitted for implant-prosthodontic treatment with a maxillary complete denture and a mandibular implant-overdenture connected to a rigid G-bar or Ti-bar. Maintenance service and problems with the implant-retention device complex and the prosthesis were recorded during minimally 3-4 years. Annual peri-implant crestal bone level changes (ΔBIC) were radiographically assessed. RESULTS Data of 213 edentulous patients (mean age 68 ± 10 years), who had received a total of 477 tapered implants, were available. Ti-bar and G-bar comprised 101 and 112 patients with 231 and 246 implants, respectively. Ti-bar mostly exhibited distal bar extensions (96%) compared to 34% of G-bar (p < .001). Fracture rate of bars extensions (4.7% vs 14.8%, p < .001) and matrices (1% vs 13%, p < .001) was lower for Ti-bar. Matrices activation was required 2.4× less often in Ti-bar. ΔBIC remained stable for both groups. CONCLUSIONS Implant overdentures supported by soldered gold bars or milled CAD/CAM Ti-bars are a successful treatment modality but require regular maintenance service. These short-term observations support the hypothesis that CAD/CAM Ti-bars reduce technical complications. Fracture location indicated that the titanium thickness around the screw-access hole should be increased.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Clinic of Reconstructive Dentistry and Gerodontology
04 Faculty of Medicine > School of Dental Medicine

UniBE Contributor:

Katsoulis, Joannis and Mericske, Regina

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1523-0899

Publisher:

Blackwell

Language:

English

Submitter:

Eveline Carmen Schuler

Date Deposited:

29 Mar 2016 10:33

Last Modified:

11 Sep 2017 20:28

Publisher DOI:

10.1111/cid.12130

PubMed ID:

23915228

Uncontrolled Keywords:

CAD/CAM technology, complications, gold, implant-overdenture, maintenance service, rigid bar, titanium

BORIS DOI:

10.7892/boris.77757

URI:

https://boris.unibe.ch/id/eprint/77757

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