COMPARISON OF THE FRACTURE RESISTANCE BETWEEN INLAY RETAINED FIXED PARTIAL DENTURES FABRICATED FROM MILLED PEEK (BIOHPP) AND MONOLITHIC ZIRCONIA (In vitro study)

Document Type : Original Article

Authors

1 Faculty of Dentistry, Future University

2 Associate Professor, Fixed Prosthodontic Department, Faculty of Dentistry, Cairo University

Abstract

Aim: To evaluate the fracture resistance of veneered PEEK IRFPDs compared to monolithic
zirconia IRFPDs.
Materials and methods: Mandibular typodont with removed mandibular first molar was used to
receive box inlay cavity preparation on mandibular second molar and second premolar. After tooth
preparation, typodont was duplicated into fourteen epoxy models using silicone mold. Epoxy
models were randomly divided into two equal groups (n= 7/group). Identical IRFPD were
fabricated from two different materials. For Group I (P/C): IRFPDs were fabricated from Bre.CAM
BioHPP blanks and subsequently veneered with composite (Crea.lign). For Group II (MZ): IRFPDs
were manufactured using industrially prefabricated monolithic zirconia blocks (Katana HTML). All
IRFPDs have been bonded to their corresponding epoxy models using adhesive resin cement
(Theracem), and underwent thermal cycling (10,000 cycles). Fracture resistance testing was
performed on the specimens using a universal testing machine with a crosshead speed of 0.5
mm/min. Fractured samples were examined using a digital-microscope, with 35x magnification
power, to determine failure mode pattern.
Results: It was found that MZ group recorded statistically significant higher fracture resistance
mean value (1876.198±218.039 N) than P/C group (1282.572±160.154 N). Most failures of MZ
group were cohesive in nature, where connector fracture was the predominant failure mode. In P/C
group, all failures were adhesive in nature between PEEK framework and composite veneering.
Conclusion: When compared to Zirconia, PEEK IRFPDs veneered with composite exhibited
sufficient resistance to fracture.

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Egyptian Dental Journal
Volume 68, Issue 4 - Serial Number 4
October (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)
October 2022
Pages 3455-3465

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