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Article Type

Original Article

Section/Category

Oral and Maxillofacial Surgery

Abstract

Objective: To evaluate and compare the marginal adaptation of CAD/CAM-fabricated three-unit provisional fixed dental prostheses (FDPs) made from polymethylmethacrylate (PMMA) and polyetheretherketone (PEEK) after cementation with either eugenol-free temporary cement or resin-based temporary cement.

Materials/Subjects and Methods: Sixty-four extracted human maxillary premolars and molars were prepared to receive three-unit FDPs and mounted in 32 acrylic resin blocks with simulated periodontal ligament. CAD/CAM provisional FDPs were fabricated from PMMA and PEEK. Specimens were divided according to temporary cement type into two main groups (n = 16) and further subdivided according to restorative material into PMMA and PEEK subgroups (n = 8). In the first group, restorations were cemented with eugenol-free temporary cement, while in the second group, resin-based temporary cement was used. Marginal adaptation was measured using a calibrated stereomicroscope before cementation and reassessed after cementation. Data were analyzed at a significance level of P ≤ 0.05.

Results: Marginal gap values decreased after cementation in all tested groups. Restorative material and time of measurement had statistically significant effects on marginal adaptation, whereas temporary cement type showed no significant independent effect. PEEK showed lower marginal gap values than PMMA, particularly in the free eugenol cement group.

Conclusions: Marginal adaptation was significantly influenced by restorative material and time of measurement, while temporary cement type had no significant independent effect. Cementation improved marginal adaptation in all groups.

Keywords

Provisional FDPs;; CAD/CAM; PMMA; PEEK.

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