engleski

Retrospective 5-year evaluation of FPDs connecting teeth and implant abutments

Objectives: There are still controversies in the literature and various clinical recommendations regarding fixed partial dentures (FPDs) splinting natural teeth and implant abutments. This type of FPD has been reported prone to several types of complications. The authors decided to perform a retrospective study on a large sample and suggest recommendations based on those results. Subjects and methods: In 197 patients residual teeth served as abutments in 217 combined tooth (754) and implant (781) supported cement retained FPDs and were retrospectivelly evaluated after a period 12 to 72 months. Inclusion criteria were normal periodontal support and adequate oral hygiene. The FPDs were constructed in both jaws, and were devided into 3 topographic categories (lateral- linear bridge, arch-linear bridge, and full arch bridge) and relative to the type of distal abutment (tooth-ending and implant-ending). Complications were organized into technical and biological. Descriptive statistics, ANOVA (p<0, 05) and Fisher exact test (alpha=0, 05) were used to analyse occurence of complications and influence of tested parameters on complications. Results: Eight of 681 implants were lost (99% survival rate, 6 in fulcrum position between teeth) over 12-72 months, and 47 demonstrated up to 1/3 of BIC loss (94% succes rate). One root resorption and 16 tooth intrusions (2%) were detected. Technical complications mostly involved ceramics chipping (6, 9%) and loss of retention (9, 3%), but also 28 abutment screw loosening (3, 5%), and 4 abutment fractures (0, 5%). Topographic category significantly influenced the number of complications with most occuring in lateral-linear bridges (p<0, 05). Conclusions: Topographical type of FPD and implant position relative to connected tooth seem to significantly influence success rates and types of complications. The results suggest that FPDs with implants placed between natural teeth demonstrate significantly larger number of both biological and technical complications, and therefore should be avoided.

FPD ; crown and bridge ; dental implants ; tooth-implant connection ; abutments

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