Clinical evaluation of extensive direct posterior composite restorations

Extensive resin-based restorations are sometimes used. The performance of such restorations is to be evaluated.

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The aim of this clinical investigation is to evaluate the clinical longevity of extensive direct posterior composite materials. The primary focus is on mechanical properties as wear, fractures, color stability, and marginal adaptation. Secondary caries, postoperative sensibility and periodontal conditions are additional interesting factors.
The influence of anamnestic, dietary, oral hygienic and salivary factors are also going to be evaluated.
A total number of 100 extensive direct dental composite restorations are going to be prepared, restored and finished by two dentists. The cavity design and restoration technique is standarized, and the same restoration material will be used in all cavities. The restorations must include at least 3 surfaces and should involve one or more cusps.
Photographs, impressions, x-rays, and clinical evaluation (modified Ryge-criteria) after 1, 3 and 5 years are methods we use in the evaluation of the restorations. In addition we use a diet questionnaire to identify any possible cariespromoting diet. Saliva factors will also be registered.
Subsequent studies will focus on fracture strength, internal adaptation and eluates from these extensive restorations.

PhD student: Torgils Lægreid.

Supervisors: Ann-Katrin Johansson, Nils R. Gjerdet, Kristina Arvidson Fyrberg