The influence of FRCs reinforcement on marginal adaptation of CAD / CAM composite resin endocrowns after simulated fatigue loading

[Abstract] To evaluate the marginal adaptation of endodontically treated molars restored with CAD/CAM composite resin endocrowns either with or without reinforcement by fibre reinforced composites (FRCs), used in different configurations. 32 human endodontically treated molars were cut 2 mm over the...

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Bibliographic Details
Published in:Odontology 2016-05, Vol.104 (2), p.220-232
Main Authors: Rocca, Giovanni Tommaso, Saratti, Carlo Massimo, Poncet, Antoine, Feilzer, Albert J., Krejci, Ivo
Format: Article
Language:jpn ; eng
Subjects:
Composite materials
Composite Resins
Crowns
Dental care
Dental Marginal Adaptation
Dental Materials
Dentistry
Humans
Medicine
Molar
Odontology
Oral and Maxillofacial Surgery
Original Article
Teeth
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Summary:[Abstract] To evaluate the marginal adaptation of endodontically treated molars restored with CAD/CAM composite resin endocrowns either with or without reinforcement by fibre reinforced composites (FRCs), used in different configurations. 32 human endodontically treated molars were cut 2 mm over the CEJ. Two interproximal boxes were created with the margins located 1 mm below the CEJ (distal box) and 1 mm over the CEJ (mesial box). All specimens were divided in four groups (n=8). The pulp chamber was filled with: group 1 (control), hybrid resin composite (G-aenial Posterior, GC); group 2, as group 1 but covered by 3 meshes of E-glass fibres (EverStick NET, Stick Tech); group 3, FRC resin (EverX Posterior, GC); group 4, as group 3 but covered by 3 meshes of E-glass fibres. The crowns of all teeth were restored with CAD/CAM composite resin endocrowns (LAVA Ultimate, 3M). All specimens were thermo-mechanically loaded in a computer-controlled chewing machine (600,000 cycles, 1.6 Hz, 49 N and simultaneously 1500 thermo-cycles, 60s, 5-55℃). Marginal analysis before and after the loading was carried out on epoxy replicas by SEM at 200× magnification. For all the groups, the percentage values of perfect marginal adaptation after loading were always significantly lower than before loading (p0.05). Within the limitations of this in vitro study, the use of FRCs to reinforce the pulp chamber of devitalized molars restored with CAD/CAM composite resin restorations did not significantly influenced their marginal quality.
ISSN:1618-1247
1618-1255
DOI:10.1007/s10266-015-0202-9