Effect of different CAD-CAM materials on the marginal and internal adaptation of endocrown restorations: An in vitro study

Wiam A El Ghoul; Mutlu Özcan; Hani Ounsi; Hani Tohme; Ziad Salameh

doi:10.1016/j.prosdent.2018.10.024

Effect of different CAD-CAM materials on the marginal and internal adaptation of endocrown restorations: An in vitro study

J Prosthet Dent. 2020 Jan;123(1):128-134. doi: 10.1016/j.prosdent.2018.10.024. Epub 2019 Apr 23.

Authors

Wiam A El Ghoul¹, Mutlu Özcan², Hani Ounsi³, Hani Tohme⁴, Ziad Salameh⁵

Affiliations

¹ Chief of clinical services, Department of Prosthodontics, School of Dentistry, Lebanese University, Beirut, Lebanon. Electronic address: drwiamelghoul@yahoo.com.
² Professor, Department of Dental Materials, School of Dentistry, University of Zurich, Zurich, Switzerland.
³ Professor, Department of Endodontics, School of Dentistry, Lebanese University, Beirut, Lebanon.
⁴ Department of Prosthodontics, School of Dentistry, Saint Joseph University, Beirut, Lebanon.
⁵ Professor, Department of Research, Department of Prosthodontics, School of Dentistry, Lebanese University, Beirut, Lebanon.

PMID: 31027958
DOI: 10.1016/j.prosdent.2018.10.024

Abstract

Statement of problem: Recent resin-based and ceramic-based computer-aided design and computer-aided manufacturing (CAD-CAM) materials have been used to restore endodontically treated teeth. Adaptation of the restoration is important for clinical success, but studies evaluating the effect of these materials on the adaptation of endocrowns are lacking.

Purpose: The purpose of this in vitro study was to evaluate the effect of resin-based and ceramic-based materials on the marginal and internal adaptation of endocrowns.

Material and methods: Forty mandibular molars were divided into 4 groups (n=10); each group was restored with a different CAD-CAM material: group C: hybrid nanoceramic (Cerasmart; GC Corp), group T: fiber-composite material (Trilor; Bioloren Srl), group E: lithium disilicate glass-ceramic (IPS e.max CAD; Ivoclar Vivadent AG), and group V: zirconia-reinforced lithium silicate glass-ceramic (Vita Suprinity; VITA Zahnfabrik GmbH). A digital scan was made with an intraoral digital scanner (TRIOS 3; 3Shape A/S), and endocrowns were milled with a 5-axis milling machine (Coritec 250i; imes-icore GmbH). The replica technique and a stereomicroscope (×70) were used to measure the marginal and internal adaptation of the endocrowns at 32 points. All data were statistically analyzed using 1-way ANOVA and the Tukey honestly significant difference test (α=.05).

Results: Statistical tests showed significant differences among the tested groups (P<.001). The resin-based groups displayed larger discrepancies than the ceramic-based groups. The resin-based groups showed a mean marginal gap larger than the mean internal gap C (P=.009), T (P<.001), whereas the ceramic-based groups showed similar gaps, V (P=.396), E (P=.936). The largest gap was observed at the pulpal floor (P<.001).

Conclusions: All materials had clinically acceptable internal and marginal gaps (≤150 μm), except for the marginal gap of the Trilor group.

MeSH terms

Ceramics
Computer-Aided Design
Crowns*
Dental Marginal Adaptation
Dental Porcelain
Dental Prosthesis Design
Humans
Materials Testing
Tooth, Nonvital*

Substances

Dental Porcelain