Adhesion procedure for CAD/CAM resin crown bonding: Reduction of bond strengths due to artificial saliva contamination Asuka Kawaguchi-Uemura, Atsushi Mine, Mariko Matsumoto, Yuko Tajiri, Mami Higashi, Tomoshige Kabetani, Ryosuke Hagino, Dai Imai, Takuya Minamino, Jiro Miura, Hirofumi Yatani Journal of Prosthodontic Research Volume 62, Issue 2, Pages 177-183 (April 2018) DOI: 10.1016/j.jpor.2017.08.006 Copyright © 2017 Japan Prosthodontic Society Terms and Conditions
Fig. 1 Experimental procedure. (1) Wet-polishing with 400 grit silicon carbide paper. (2) Each group was further divided into four groups: positive control group (P-Co), negative control group (N-Co), sandblasting group (Sb) and acid treatment group (AT). All blocks were sandblasted using Adabrader for 20s and air dried for 10s. All specimens were then silanized for 10s. (3) Surface analysis: SEM observation, 3D laser analysis and contact angle measurement. (4) μTBS values (n=24 beams/group) were measured immediately after cutting blocks into beams. All remaining beams were stored in water. After 1 month, 3 months and 6 months of water storage, μTBS was measured. Fractured surfaces after μTBS measurement were analyzed. Journal of Prosthodontic Research 2018 62, 177-183DOI: (10.1016/j.jpor.2017.08.006) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions
Fig. 2 SEM observation of the adherend surface. a, b: P-Co group. Alumina particles were observed on the block surface. c, d: N-Co group. An artificial saliva contamination layer was observed on the surface. e, f: Sb group. g, h: AT group. P-Co: positive control group, N-Co: negative control group, Sb: sandblasting group, AT: acid treatment group. Journal of Prosthodontic Research 2018 62, 177-183DOI: (10.1016/j.jpor.2017.08.006) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions
Fig. 3 3D laser analysis. 3D laser microscope images show that differences in surface topography are dependent on surface roughness. P-Co: positive control group, N-Co: negative control group, Sb: sandblasting group, AT: acid treatment group. Journal of Prosthodontic Research 2018 62, 177-183DOI: (10.1016/j.jpor.2017.08.006) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions
Fig. 4 μTBS measurement. *: P<0.01, **: P<0.001. Error bars indicate the mean±1 SD. P-Co: positive control group, N-Co: negative control group, Sb: sandblasting group, AT: acid treatment group, 0M: initial, 1M: 1 month of water storage, 3M: 3 months of water storage, 6M: 6 months of water storage. Journal of Prosthodontic Research 2018 62, 177-183DOI: (10.1016/j.jpor.2017.08.006) Copyright © 2017 Japan Prosthodontic Society Terms and Conditions