{"title":"不同抛光工艺对slm打印牙科用Co-Cr合金表面形貌、耐蚀性和RPD框架适应性的影响。","authors":"Jiawen Gan, Hanzhi Zhang, Jian Sun, Chenyuan Zhu, Ting Jiao","doi":"10.1111/jopr.70013","DOIUrl":null,"url":null,"abstract":"<p><strong>Purpose: </strong>This in vitro study aims to compare the effects of electrolytic polishing (EP), plasma electrolytic polishing (PP), dry electropolishing (DP), and their combination on the surface characteristics, corrosion resistance, and material reduction of selective laser melting (SLM) printed dental cobalt-chromium (Co-Cr) alloy.</p><p><strong>Materials and methods: </strong>Standard samples and removable partial denture (RPD) frameworks were SLM-printed and then polished using the following methods: mechanical polishing (MP), EP, PP, DP, PDP (PP + DP), DPP (DP + PP), and PDPP (PP + DP + PP). Surface characteristics were analyzed using optical profilometry, scanning electron microscopy (SEM), and x-ray photoelectron spectroscopy (XPS). Corrosion resistance was assessed through electrochemical testing and ion release experiments. The metal reduction was evaluated by measuring weight loss, major connector and clasp thickness loss, and framework adaptation. The post-processing time for the technician's fine polishing of these frameworks was recorded to further evaluate the polishing quality of the frameworks. All measurements were presented as mean ±standard deviation. Statistical data were analyzed using analysis of variance (ANOVA) and nonparametric one-way analysis.</p><p><strong>Results: </strong>The MP group exhibited the lowest roughness (0.04 ± 0.01 µm), followed by the PDPP group (0.49 ± 0.12 µm). All groups had a passivation film composition predominantly composed of Cr<sub>2</sub>O<sub>3</sub>, with a small amount of CrO<sub>3</sub> observed in the PDP group. PDPP exhibited minimal ion release (0.12 µg/cm<sup>2</sup>) and stable Nyquist plots. PDPP can significantly reduce the technician's post-processing time (45.75 s, p < 0.05) without compromising the adaptation of the frameworks.</p><p><strong>Conclusions: </strong>PDPP forms a stable passivation film with extremely low ion release and a highly smooth, uniform surface. This significantly reduces the time required for manual post-processing while maintaining the accuracy of RPD frameworks, making it highly suitable for large-scale clinical framework polishing.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4000,"publicationDate":"2025-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of various polishing processes on surface morphology, corrosion resistance, and RPD framework adaptation of SLM-printed dental Co-Cr alloys.\",\"authors\":\"Jiawen Gan, Hanzhi Zhang, Jian Sun, Chenyuan Zhu, Ting Jiao\",\"doi\":\"10.1111/jopr.70013\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Purpose: </strong>This in vitro study aims to compare the effects of electrolytic polishing (EP), plasma electrolytic polishing (PP), dry electropolishing (DP), and their combination on the surface characteristics, corrosion resistance, and material reduction of selective laser melting (SLM) printed dental cobalt-chromium (Co-Cr) alloy.</p><p><strong>Materials and methods: </strong>Standard samples and removable partial denture (RPD) frameworks were SLM-printed and then polished using the following methods: mechanical polishing (MP), EP, PP, DP, PDP (PP + DP), DPP (DP + PP), and PDPP (PP + DP + PP). Surface characteristics were analyzed using optical profilometry, scanning electron microscopy (SEM), and x-ray photoelectron spectroscopy (XPS). Corrosion resistance was assessed through electrochemical testing and ion release experiments. The metal reduction was evaluated by measuring weight loss, major connector and clasp thickness loss, and framework adaptation. The post-processing time for the technician's fine polishing of these frameworks was recorded to further evaluate the polishing quality of the frameworks. All measurements were presented as mean ±standard deviation. Statistical data were analyzed using analysis of variance (ANOVA) and nonparametric one-way analysis.</p><p><strong>Results: </strong>The MP group exhibited the lowest roughness (0.04 ± 0.01 µm), followed by the PDPP group (0.49 ± 0.12 µm). All groups had a passivation film composition predominantly composed of Cr<sub>2</sub>O<sub>3</sub>, with a small amount of CrO<sub>3</sub> observed in the PDP group. PDPP exhibited minimal ion release (0.12 µg/cm<sup>2</sup>) and stable Nyquist plots. PDPP can significantly reduce the technician's post-processing time (45.75 s, p < 0.05) without compromising the adaptation of the frameworks.</p><p><strong>Conclusions: </strong>PDPP forms a stable passivation film with extremely low ion release and a highly smooth, uniform surface. This significantly reduces the time required for manual post-processing while maintaining the accuracy of RPD frameworks, making it highly suitable for large-scale clinical framework polishing.</p>\",\"PeriodicalId\":49152,\"journal\":{\"name\":\"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":3.4000,\"publicationDate\":\"2025-08-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1111/jopr.70013\",\"RegionNum\":2,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"DENTISTRY, ORAL SURGERY & MEDICINE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1111/jopr.70013","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
Effects of various polishing processes on surface morphology, corrosion resistance, and RPD framework adaptation of SLM-printed dental Co-Cr alloys.
Purpose: This in vitro study aims to compare the effects of electrolytic polishing (EP), plasma electrolytic polishing (PP), dry electropolishing (DP), and their combination on the surface characteristics, corrosion resistance, and material reduction of selective laser melting (SLM) printed dental cobalt-chromium (Co-Cr) alloy.
Materials and methods: Standard samples and removable partial denture (RPD) frameworks were SLM-printed and then polished using the following methods: mechanical polishing (MP), EP, PP, DP, PDP (PP + DP), DPP (DP + PP), and PDPP (PP + DP + PP). Surface characteristics were analyzed using optical profilometry, scanning electron microscopy (SEM), and x-ray photoelectron spectroscopy (XPS). Corrosion resistance was assessed through electrochemical testing and ion release experiments. The metal reduction was evaluated by measuring weight loss, major connector and clasp thickness loss, and framework adaptation. The post-processing time for the technician's fine polishing of these frameworks was recorded to further evaluate the polishing quality of the frameworks. All measurements were presented as mean ±standard deviation. Statistical data were analyzed using analysis of variance (ANOVA) and nonparametric one-way analysis.
Results: The MP group exhibited the lowest roughness (0.04 ± 0.01 µm), followed by the PDPP group (0.49 ± 0.12 µm). All groups had a passivation film composition predominantly composed of Cr2O3, with a small amount of CrO3 observed in the PDP group. PDPP exhibited minimal ion release (0.12 µg/cm2) and stable Nyquist plots. PDPP can significantly reduce the technician's post-processing time (45.75 s, p < 0.05) without compromising the adaptation of the frameworks.
Conclusions: PDPP forms a stable passivation film with extremely low ion release and a highly smooth, uniform surface. This significantly reduces the time required for manual post-processing while maintaining the accuracy of RPD frameworks, making it highly suitable for large-scale clinical framework polishing.
期刊介绍：
The Journal of Prosthodontics promotes the advanced study and practice of prosthodontics, implant, esthetic, and reconstructive dentistry. It is the official journal of the American College of Prosthodontists, the American Dental Association-recognized voice of the Specialty of Prosthodontics. The journal publishes evidence-based original scientific articles presenting information that is relevant and useful to prosthodontists. Additionally, it publishes reports of innovative techniques, new instructional methodologies, and instructive clinical reports with an interdisciplinary flair. The journal is particularly focused on promoting the study and use of cutting-edge technology and positioning prosthodontists as the early-adopters of new technology in the dental community.
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