Izvorni znanstveni članak
Reliability of Bonded MOD Restorations in Maxillary Premolars: Microleakage and Cusp Fracture Resistance
Moataz F. El Gezawi
orcid.org/0000-0002-4908-8598
; Restorative Dentistry, Cairo University-Associate, Egipat
Fahad A. Al-Harbi
; Fixed Prosthodontics, University of Dammam, Saudijska arabija
Sažetak
Purpose: This in vitro investigation was performed to assess microleakage and cusp fracture resistance of maxillary premolars specimens involving composite resin direct restorations and ceramic inlay restorations. Material and methods: Specimens were tested after artificial aging provoked by thermal and occlusal load cycling. For that purpose, 66 extracted maxillary premolars were used with six premolars in each study group. Standardized MOD cavities were prepared and classified into two main groups according to gingival-margins location either 1mm above (A1) or 1 mm below (A2) the CEJ. Specimens were subdivided into two subgroups: Z250 composite resin direct restorations and IPS Empress glass ceramic restorations cemented with Variolink II resincement. Group of intact teeth specimens and two groups of A1 and A2 type prepared but not restored teeth served as control groups. Restored teeth were mounted in acrylic-resin blocks before loading and thermocycling. Microleakage was assessed by examining dye penetration scores under Zeiss-stereomicroscope. Cusp fracture resistance was performed using vertical static loading until failure. The fracture-load test mean values and microleakage results were statistically analyzed. Results: Investigated restorations showed insignificant difference in adaptation at enamel margins. Ceramic restorations showed better sealability and tooth structure reinforcing effects than composite restorations, especially at non-enamel margins. Conclusions: Cavity preparation produced significant weakening effect. Restorations just partly compensated weakening effect of cavity preparation. Upgrading the performance of adhesive restorations in terms of adaptation and tooth structure reinforcement poses a continuing challenge to restorative dentistry.
Ključne riječi
Bicuspid; Dental Bonding; Dental Cavity Preparation; Composite Resins; Metal Ceramic Alloys; Tooth Fractures; Dental Leakage
Hrčak ID:
78644
URI
Datum izdavanja:
20.3.2012.
Posjeta: 2.722 *