Florian Flierl, Benedikt C Spies, Severin Rothlauf, Kirstin Vach, Ralf J Kohal, Jörg Lüchtenborg
{"title":"冲洗后异丙醇单体污染对还原光聚合牙模型精度的影响。","authors":"Florian Flierl, Benedikt C Spies, Severin Rothlauf, Kirstin Vach, Ralf J Kohal, Jörg Lüchtenborg","doi":"10.1111/jopr.70011","DOIUrl":null,"url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this study was to investigate the impact of an increasing level of monomer contamination of isopropanol (isopropyl alcohol [IPA]) during post-rinsing on the dimensional stability of test samples produced by vat photopolymerization. The effect of resin deposits due to insufficient post-rinsing on the accuracy (volume, mean, and maximum deviation) of additive manufacturing workflows was investigated, which has received limited attention in studies on accuracy.</p><p><strong>Materials and methods: </strong>Forty test specimens (four groups, n = 10) were produced from a commonly used resin for dental model fabrication and underwent post-rinsing in IPA with different levels of monomer contamination (0, 10, 20, and 30 wt%). The dimensional stability was assessed by comparing the optical scan of the produced test specimens with the original digital design. Both the volume of the deposited resin and the effect of different model shapes (inner edges, smooth surfaces, and outer edges) on deposition were investigated. Statistical evaluation was performed using the Kruskal-Wallis test and Dunn's test for pairwise comparisons with Holm correction. To simulate clinical conditions, 20 dental models (four groups, n = 5) were produced, post-processed, and examined using a scanning method.</p><p><strong>Results: </strong>No significant deviations in specimen dimensions occurred when the monomer contamination was 0%-10%. In the range of 10%-20% contamination, a few significant deviations occurred in the area of sharp inner edges, \"inside structures\" and small structures (diameter <1000 µm). At contamination levels of 30%, significant deviations were observed eventually in all measured areas.</p><p><strong>Conclusions: </strong>This study showed that, contrary to the manufacturer's specifications, the IPA should only be replaced during post-rinsing if the monomer contamination of the rinsing solution is >20%. At contamination levels of 10%-20%, post-rinsing of components with large smooth surfaces without sharp edges (e.g., custom trays) is possible without significant deformation. Only for components with very small, sharp-edged, or inverted structures is it advisable to replace the IPA from a contamination level of 10%.</p>","PeriodicalId":49152,"journal":{"name":"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry","volume":" ","pages":""},"PeriodicalIF":3.4000,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Impact of monomer contamination of isopropanol during post-rinsing on the accuracy of dental models fabricated by vat photopolymerization.\",\"authors\":\"Florian Flierl, Benedikt C Spies, Severin Rothlauf, Kirstin Vach, Ralf J Kohal, Jörg Lüchtenborg\",\"doi\":\"10.1111/jopr.70011\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Purpose: </strong>The aim of this study was to investigate the impact of an increasing level of monomer contamination of isopropanol (isopropyl alcohol [IPA]) during post-rinsing on the dimensional stability of test samples produced by vat photopolymerization. The effect of resin deposits due to insufficient post-rinsing on the accuracy (volume, mean, and maximum deviation) of additive manufacturing workflows was investigated, which has received limited attention in studies on accuracy.</p><p><strong>Materials and methods: </strong>Forty test specimens (four groups, n = 10) were produced from a commonly used resin for dental model fabrication and underwent post-rinsing in IPA with different levels of monomer contamination (0, 10, 20, and 30 wt%). The dimensional stability was assessed by comparing the optical scan of the produced test specimens with the original digital design. Both the volume of the deposited resin and the effect of different model shapes (inner edges, smooth surfaces, and outer edges) on deposition were investigated. Statistical evaluation was performed using the Kruskal-Wallis test and Dunn's test for pairwise comparisons with Holm correction. To simulate clinical conditions, 20 dental models (four groups, n = 5) were produced, post-processed, and examined using a scanning method.</p><p><strong>Results: </strong>No significant deviations in specimen dimensions occurred when the monomer contamination was 0%-10%. In the range of 10%-20% contamination, a few significant deviations occurred in the area of sharp inner edges, \\\"inside structures\\\" and small structures (diameter <1000 µm). At contamination levels of 30%, significant deviations were observed eventually in all measured areas.</p><p><strong>Conclusions: </strong>This study showed that, contrary to the manufacturer's specifications, the IPA should only be replaced during post-rinsing if the monomer contamination of the rinsing solution is >20%. At contamination levels of 10%-20%, post-rinsing of components with large smooth surfaces without sharp edges (e.g., custom trays) is possible without significant deformation. Only for components with very small, sharp-edged, or inverted structures is it advisable to replace the IPA from a contamination level of 10%.</p>\",\"PeriodicalId\":49152,\"journal\":{\"name\":\"Journal of Prosthodontics-Implant Esthetic and Reconstructive Dentistry\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":3.4000,\"publicationDate\":\"2025-07-24\",\"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.70011\",\"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.70011","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}
Impact of monomer contamination of isopropanol during post-rinsing on the accuracy of dental models fabricated by vat photopolymerization.
Purpose: The aim of this study was to investigate the impact of an increasing level of monomer contamination of isopropanol (isopropyl alcohol [IPA]) during post-rinsing on the dimensional stability of test samples produced by vat photopolymerization. The effect of resin deposits due to insufficient post-rinsing on the accuracy (volume, mean, and maximum deviation) of additive manufacturing workflows was investigated, which has received limited attention in studies on accuracy.
Materials and methods: Forty test specimens (four groups, n = 10) were produced from a commonly used resin for dental model fabrication and underwent post-rinsing in IPA with different levels of monomer contamination (0, 10, 20, and 30 wt%). The dimensional stability was assessed by comparing the optical scan of the produced test specimens with the original digital design. Both the volume of the deposited resin and the effect of different model shapes (inner edges, smooth surfaces, and outer edges) on deposition were investigated. Statistical evaluation was performed using the Kruskal-Wallis test and Dunn's test for pairwise comparisons with Holm correction. To simulate clinical conditions, 20 dental models (four groups, n = 5) were produced, post-processed, and examined using a scanning method.
Results: No significant deviations in specimen dimensions occurred when the monomer contamination was 0%-10%. In the range of 10%-20% contamination, a few significant deviations occurred in the area of sharp inner edges, "inside structures" and small structures (diameter <1000 µm). At contamination levels of 30%, significant deviations were observed eventually in all measured areas.
Conclusions: This study showed that, contrary to the manufacturer's specifications, the IPA should only be replaced during post-rinsing if the monomer contamination of the rinsing solution is >20%. At contamination levels of 10%-20%, post-rinsing of components with large smooth surfaces without sharp edges (e.g., custom trays) is possible without significant deformation. Only for components with very small, sharp-edged, or inverted structures is it advisable to replace the IPA from a contamination level of 10%.
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.