Fracture resistance of endodontically treated premolars restored with CAD-CAM onlays

To evaluate the fracture resistance of endodontically treated premolars restored with CAD-CAM onlay restorations. 60 extracted mandibular first premolars were selected and at first divided into three groups regarding treatment options: MOD onlay with buccal cusp coverage, MOD onlay with buccal cusp...

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Published inAmerican journal of dentistry Vol. 35; no. 6; p. 308
Main Authors Ozan, Günce, Eren, Meltem M, Dikmen, Benin, Yildiz, Esra
Format Journal Article
LanguageEnglish
Published United States 01.12.2022
Subjects
Composite Resins
Computer-Aided Design
Dental Porcelain
Dental Stress Analysis
Humans
Inlays
Tooth Fractures
Tooth, Nonvital - drug therapy
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Summary:To evaluate the fracture resistance of endodontically treated premolars restored with CAD-CAM onlay restorations. 60 extracted mandibular first premolars were selected and at first divided into three groups regarding treatment options: MOD onlay with buccal cusp coverage, MOD onlay with buccal cusp coverage + endodontic treatment, MOD onlay with buccal cusp coverage + endodontic treatment + fiber post. Then, all groups were divided into subgroups (n=10) according to the restorative material used: IPS e.max CAD and Lava Ultimate. Each group was submitted to 5,000 thermal cycles, embedded in acrylic resin and secured in a universal testing machine respectively. A compressive load was applied until fracture, at a crosshead speed of 0.5 mm/minute. Statistical significance among each group was analyzed using one-way ANOVA and Bonferroni tests. Statistically, endodontically treated IPS e.max onlays had numerically the lowest average fracture resistance [753.1 (± 224.9) N/mm² ] among all treatment options. IPS e.max onlays treated with fiber posts had significantly higher resistance than that of endodontically treated IPS e.max CAD group (P= 0.013). Endodontically treated teeth restored with Lava Ultimate onlays [1,381.0 (± 471.7) N/mm²] showed significantly higher averages of fracture resistance than IPS e.max CAD onlays. CAD-CAM composite (resin nanoceramic) onlays resist greater forces compared to ceramic restorations. Fiber posts could improve the fracture resistance of endodontically treated mandibular premolars following the ceramic CAD-CAM onlays.
ISSN:0894-8275