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Statement of problemSeveral additively and subtractively manufactured resin-based materials indicated for interim and definitive fixed dental prostheses have been launched. However, knowledge of the bond strength of these materials to different implant abutment materials is limited. PurposeThe purpose of this in vitro study was to evaluate the shear bond strength (SBS) of additively and subtractively manufactured resin-based materials to different implant abutment materials. Material and methodsOne hundred and ten disk-shaped specimens (Ø3×3 mm) were fabricated either additively from 2 resins indicated for definitive use (Crowntec; AMCT and VarseoSmile Crown Plus; AMVS) and 1 resin indicated for interim use (FREEPRINT temp; AMFP) or subtractively from a nanographene-reinforced polymethyl methacrylate (G-CAM; SMGC) and a high-impact polymer composite (breCAM. HIPC; SMBC). After allocating 2 specimens from each group for scanning electron microscope evaluation, the specimens were divided according to the abutment material (CopraPeek; polyetheretherketone, PEEK and Dentium Superline Pre-Milled Abutment; titanium, Ti) (n=10). All specimens were airborne-particle abraded with 50-µm aluminum oxide. After applying a resin primer (Visio. link) to PEEK and an adhesive primer (Clearfil Ceramic Primer Plus) to Ti specimens, a self-adhesive resin cement (PANAVIA SA Cement Universal) was used for cementation. All specimens were stored in distilled water (24 hours, 37 °C), and a universal testing device was used for the SBS test. SBS data were analyzed with 2-way analysis of variance and Tukey honestly significant difference tests, while the chi-squared test was used to evaluate the difference among the abutment-resin pairs in terms of failure modes (α=. 05). ResultsThe interaction between the material type and the abutment type and the main factor of material type affected the SBS (P<. 001). SMBC-PEEK and SMGC had the lowest SBS followed by SMBC-Ti, whereas AMVS-PEEK had the highest SBS (P≤. 001). AMCT-Ti had higher SBS than AMFP-PEEK (P=. 026). SMGC had the lowest and AMVS had the highest SBS, while AMCT and AMFP had higher SBS than SMBC (P≤. 004). The distribution of failure modes was significantly different among tested material-abutment pairs, and only for AMCT among tested materials (P≤. 025). Most of the material-abutment pairs had a minimum of 80% adhesive failures. ConclusionsRegardless of the abutment material, additively manufactured specimens had higher bond strength and one of the subtractively manufactured materials (SMGC) mostly had lower bond strength. The abutment material had a small effect on the bond strength. Adhesive failures were observed most frequently.
Küçükekenci et al. (Fri,) studied this question.