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Peri-implant bone alterations in relation to inter-unit distances. A 3-year retrospective study.

Artikel i vetenskaplig tidskrift
Författare Giuseppe Cardaropoli
Jan Wennström
Ulf Lekholm
Publicerad i Clinical oral implants research
Volym 14
Nummer/häfte 4
Sidor 430-6
ISSN 0905-7161
Publiceringsår 2003
Publicerad vid Odontologiska institutionen, Avdelningen för oral och maxillofacial kirurgi
Odontologiska institutionen, Avdelningen för parodontologi
Sidor 430-6
Språk en
Länkar www.ncbi.nlm.nih.gov/entrez/query.f...
Ämnesord Aged, Aged, 80 and over, Alveolar Bone Loss, radiography, Alveolar Process, radiography, Cephalometry, Dental Abutments, Dental Implantation, Endosseous, methods, Dental Implants, Dental Prosthesis, Implant-Supported, Denture, Partial, Fixed, Female, Follow-Up Studies, Humans, Longitudinal Studies, Male, Middle Aged, Multivariate Analysis, Regression Analysis, Retrospective Studies, Tooth, radiography
Ämneskategorier Parodontologi

Sammanfattning

The aim of the present retrospective study was to evaluate longitudinal alterations in radiographic bone topography at proximal sites of three-unit implant-supported fixed partial prostheses during the first 3 years after bridge installation, in relation to vertical and horizontal inter-unit distances. The subjects were partially dentate patients who had received implant-supported fixed partial prostheses during the year 1995 at the Brånemark Clinic, Göteborg, Sweden. For inclusion in the study, the patient had to have a three-unit bridge construction supported by three implants in the posterior area of the jaw. Twenty-eight patients having 35 screw-retained prostheses on Brånemark standard implants fulfilled the inclusion criteria. Radiographs obtained at bridge installation and at 1- and 3-year follow-ups were assessed for implant positions, contact point level, bone level at implants and adjacent tooth and mid-proximal bone crest level. The data were analysed with respect to two proximal units: tooth/implant units (n=35) and implant/implant units (n=70). Multiple regression analyses were used to evaluate the influence of various factors on the peri-implant and periodontal bone level changes during the 3 years of follow-up. At the tooth/implant units, the mean bone loss over the 3 years was 0.5 mm at the implant and 0.4 mm at the tooth. Multiple regression analysis failed to identify significant explanatory factors for the peri-implant/periodontal bone level changes at the tooth/implant units (R2=0.28). At the implant/implant units, the peri-implant bone loss was 0.6-0.7 mm and was significantly influenced by the vertical inter-implant distance (P<0.01), the difference in bone level at baseline between two neighbouring implants (P<0.001) and the bone level changes at the opposed implant surface (P<0.001) (R2=0.49). Furthermore, the magnitude of apical displacement of the inter-implant bone crest level during the 3 years of follow-up was negatively associated with the horizontal inter-implant distance (P<0.05). The results of the study demonstrated that both vertical and horizontal differences in implant positions might influence bone alterations in the inter-implant area during the first 3 years of loading, while the data failed to show corresponding relationships for the bone changes at the proximal area between the implant and the neighbouring tooth.

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