@article{2990044,
    title = "Effect of Thermomechanical Loading on the Cementation Interface of Implant-Supported CAD/CAM Crowns Luted to Titanium Abutments",
    author = "Loannidis, A. and Gil, A. and Hämmerle, C.H.F. and Jung, R.E. and Zinelis, S. and Eliades, G.",
    journal = "THE INTERNATIONAL JOURNAL OF PROSTHODONTICS",
    year = "2020",
    volume = "33",
    number = "6",
    pages = "656-662",
    publisher = "Quintessence Publishing Co, Inc",
    issn = "0893-7569",
    doi = "10.11607/ijp.6709",
    keywords = "titanium, cementation;  ceramics;  computer aided design;  tooth crown, Cementation;  Ceramics;  Computer-Aided Design;  Crowns;  Titanium",
    abstract = "Purpose: To investigate the effect of aging on the morphology of the interface between monolithic implant crowns and standardized titanium base abutments. Materials and Methods: Four groups of hybrid abutment crowns differing in restorative material (lithium disilicate [LD] or polymer-infiltrated ceramic network [PICN]) and in fabrication procedure of the interfacial zone for luting to a titanium abutment (milled during CAD/ CAM procedure [M] or prefabricated [P]) were formed: LDS-M, LDS-P, PICN-M, and PICN-P (n = 10 each). The morphology of the crown-abutment interface was examined before and after artificial aging using scanning electron microscopy. The total gap length per specimen was measured at both time points, and intergroup (Kruskal-Wallis [KW]) plus pairwise (Wilcoxon Mann-Whitney [WMW]) comparisons were performed (α =. 05). Results: Before aging, statistically significant differences in gap length were identified among groups (KW: P=. 0369) for PICN-P > LDS-P (WMW: P=. 0496) and LDS-M > LDS-P (WMW: P=. 0060). The effect of aging among the groups, expressed as an increment of total gap length, was 50% in LDS-M, 30% in LDS-P, 20% in PICN-M, and 30% in PICN-P. After aging, the statistically significant differences in gap length identified among groups (KW: P=. 0048) were for PICN-P > LDS-P (WMW: P=. 0134); LDS-M > PICN-M (WMW: P=. 0204); PICN-P > PICN-M (WMW: P=. 0486); and LDS-M > LDS-P (P=. 0022). However, comparison of the difference in gap length from before to after aging among the groups was not statistically significant (KW: P =. 3549). Conclusion: The cementation interfaces of CAD/CAM crowns on standardized titanium base abutments demonstrated a high percentage of gaps before and after thermomechanical loading. The composition of the restorative material and the nature of the interface influenced the interfacial gap dimension. Int J Prosthodont 2020;33:656–662. doi: 10.11607/ijp.6709 © 2020. by Quintessence Publishing Co Inc. All rights reserved."
}