Fitness and retentive force of cobalt-chromium alloy clasps fabricated with repeated laser sintering and milling Mana Torii, Toyoki Nakata, Kazuya Takahashi,

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Fitness and retentive force of cobalt-chromium alloy clasps fabricated with repeated laser sintering and milling Mana Torii, Toyoki Nakata, Kazuya Takahashi, Noboru Kawamura, Hidemasa Shimpo, Chikahiro Ohkubo Journal of Prosthodontic Research Volume 62, Issue 3, Pages 342-346 (July 2018) DOI: 10.1016/j.jpor.2018.01.001 Copyright © 2018 Japan Prosthodontic Society Terms and Conditions

Fig. 1 Akers clasp assemblies on the tooth die and the size of the clasp arm. Journal of Prosthodontic Research 2018 62, 342-346DOI: (10.1016/j.jpor.2018.01.001) Copyright © 2018 Japan Prosthodontic Society Terms and Conditions

Fig. 2 Testing apparatus provided a repeated insertion/removal motion (crosshead speed: 950mm/min) up to 10,000 cycles in distilled water at 37°C, to simulate the placement and removal of RPDs. Journal of Prosthodontic Research 2018 62, 342-346DOI: (10.1016/j.jpor.2018.01.001) Copyright © 2018 Japan Prosthodontic Society Terms and Conditions

Fig. 3 Surface roughness (Ra) of the internal surface of the only rest region of all clasp specimen (n=5, p<0.05). Journal of Prosthodontic Research 2018 62, 342-346DOI: (10.1016/j.jpor.2018.01.001) Copyright © 2018 Japan Prosthodontic Society Terms and Conditions

Fig. 4 (a) Fitness accuracy of each clasp, rest region (n=5, p<0.05). (b) Fitness accuracy of each clasp, clasp arm (n=5, p<0.05). (c) Fitness accuracy of each clasp, clasp tip (n=5, p<0.05). Journal of Prosthodontic Research 2018 62, 342-346DOI: (10.1016/j.jpor.2018.01.001) Copyright © 2018 Japan Prosthodontic Society Terms and Conditions

Fig. 5 Initial retentive force obtained from the average of the retentive forces during the first 10 insertion/removal (n=5, p<0.05). Journal of Prosthodontic Research 2018 62, 342-346DOI: (10.1016/j.jpor.2018.01.001) Copyright © 2018 Japan Prosthodontic Society Terms and Conditions

Fig. 6 Changes in retentive force up to 10,000 cycles to simulate the placement and removal of RPDs. Journal of Prosthodontic Research 2018 62, 342-346DOI: (10.1016/j.jpor.2018.01.001) Copyright © 2018 Japan Prosthodontic Society Terms and Conditions