Universität zu Köln

Niedermeier, Wilhelm (2016). Bollard coping as an attachment for implant-supported dentures. Implantologie, 24 (2). S. 157 - 168. BERLIN: QUINTESSENZ VERLAGS-GMBH. ISSN 0943-9692

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Abstract

The Bollard coping has been employed as an attachment for implant-supported dentures for more than 15 years. After the conclusion of a preliminary study reporting 3-year results in 28 patients, the present investigation was performed prospectively in 125 patients wearing 46 maxillary and 121 mandibular Bollard coping attached dentures, each supported by only two implants placed in the canine region. The Bollard attachments were processed as described in the previous study. Patients were recalled in yearly intervals for up to 12 years afterward, whereby findings of the peri-implant conditions, functional or total loss of implants, alterations of denture materials, as well as functional and esthetic parameters of the dentures were recorded. For comparison, findings of bar-and ball-retained implant-supported mandibular dentures with similar characteristics were recorded over a period of 5 years. The censored cause-specific time-to-event analysis (including competing risk regression) of data revealed a cumulative implant loss of 13.3% in the maxilla and 6.3% in the mandible when using Bollard attachments for 10 years. After 5 years, the loss of implants provided with Bollard copings amounted to 2.3% in the mandible and was significantly less than in bar-retained (8.7%, P = .002) or ball-retained prostheses (26.3%, P < .001). In addition, peri-implant findings of oral mucosa and bone as well as the plaque index were significantly more favorable when using Bollard copings for the attachment of dentures, yielding the type of attachment as a statistical variance factor. The quality of Molloplast B (DETAX) remained the same throughout the study period, and after 5 years of use only 5.9% of the lower secondary parts of the Bollard attachments had to be replaced in maxillary dentures and 14.7% in mandibular dentures. Conversely, ball attachments had to be rebuilt in 63% of dentures. Further repairs of the dentures were significantly less frequent in Bollard coping attached dentures than in any other type of prosthesis studied. Moreover, the subjective ratings of function and retention as well as of esthetic aspects like phonetics and oral comfort were better in dentures provided with Bollard copings than in those with bar or ball attachments.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Niedermeier, Wilhelm UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-288758
Journal or Publication Title:	Implantologie
Volume:	24
Number:	2
Page Range:	S. 157 - 168
Date:	2016
Publisher:	QUINTESSENZ VERLAGS-GMBH
Place of Publication:	BERLIN
ISSN:	0943-9692
Language:	German
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RANDOMIZED CLINICAL-TRIAL; MANDIBULAR OVERDENTURES; SILICONE; OUTCOMES; LINERS Multiple languages Dentistry, Oral Surgery & Medicine Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28875