{"title":"High-Strength Porcelain Veneering of Zirconia Prosthetic Mimetic Restorations\n(PRIMERO) by Cognitive Design and Manufacturing","authors":"J. V. D. Zel","doi":"10.33140/jodh.03.02.09","DOIUrl":null,"url":null,"abstract":"Esthetic prosthetic restorations, with natural reflection, color from within and color gradients influenced by the internal dentinal core anatomy can best be accomplished by veneered zirconia, rather than with crowns of color and structure graded monolithic zirconia. Concern about the high incidence of chipping with some of the porcelains for zirconia substructures has led to a massive shift from veneered zirconia to the use of monolithic zirconia for crowns and bridges. Because zirconia has four times the hardness of metal, initial concern about antagonist abrasion could with numerous studies be negated. Clinical long-term effects of lack of abrasion of full zirconia crowns, in comparison with 30-75 μm/year for surrounding and opposing dentition is still poorly documented. Massive crack formation in enamel probes has been reported in specimens after in-vitro fatigue testing with opposing monolithic zirconia. In-vitro and clinical studies have shown that only reinforcement of the structure of veneering material can prevent chipping. This article compares the fatigue behavior of three-unit bridges with a substructure of Primero zirconia veneered with Primero Enamel (PR) with bridges with Cercon Base zirconia inner-structure veneered with Ceramco PFZ and Cercon Ceram S (CR1 and CR2) and assess the possibilities and increase their scope to cognitive design and manufacturing of porcelain veneered zirconia crowns and bridges. Fatigue testing of four times eight 3-unit bridges were produced for each of the three porcelains and a reference. The results show that efficient crack-stopping prevented chipping with the PR bridges, while the bridges with conventional porcelains CR1 and CR2, showed failures. We conclude that chipping is mainly porcelain related. Cognitive design and fabrication of the dentin zirconia core will lead to prosthetic mimetic restorations (PRIMERO) with natural esthetics.","PeriodicalId":15598,"journal":{"name":"Journal of dental health, oral disorders & therapy","volume":"2 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of dental health, oral disorders & therapy","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.33140/jodh.03.02.09","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Esthetic prosthetic restorations, with natural reflection, color from within and color gradients influenced by the internal dentinal core anatomy can best be accomplished by veneered zirconia, rather than with crowns of color and structure graded monolithic zirconia. Concern about the high incidence of chipping with some of the porcelains for zirconia substructures has led to a massive shift from veneered zirconia to the use of monolithic zirconia for crowns and bridges. Because zirconia has four times the hardness of metal, initial concern about antagonist abrasion could with numerous studies be negated. Clinical long-term effects of lack of abrasion of full zirconia crowns, in comparison with 30-75 μm/year for surrounding and opposing dentition is still poorly documented. Massive crack formation in enamel probes has been reported in specimens after in-vitro fatigue testing with opposing monolithic zirconia. In-vitro and clinical studies have shown that only reinforcement of the structure of veneering material can prevent chipping. This article compares the fatigue behavior of three-unit bridges with a substructure of Primero zirconia veneered with Primero Enamel (PR) with bridges with Cercon Base zirconia inner-structure veneered with Ceramco PFZ and Cercon Ceram S (CR1 and CR2) and assess the possibilities and increase their scope to cognitive design and manufacturing of porcelain veneered zirconia crowns and bridges. Fatigue testing of four times eight 3-unit bridges were produced for each of the three porcelains and a reference. The results show that efficient crack-stopping prevented chipping with the PR bridges, while the bridges with conventional porcelains CR1 and CR2, showed failures. We conclude that chipping is mainly porcelain related. Cognitive design and fabrication of the dentin zirconia core will lead to prosthetic mimetic restorations (PRIMERO) with natural esthetics.
美观的修复体,具有自然反射、内部颜色和受内牙本质解剖结构影响的颜色梯度,最好由贴面氧化锆完成,而不是使用颜色和结构分级的整体氧化锆冠。由于担心氧化锆下部结构的陶瓷容易碎裂,人们开始大规模地从贴面氧化锆转向使用整体氧化锆来制作冠和桥。由于氧化锆的硬度是金属硬度的四倍,因此可以通过大量的研究来消除最初对拮抗磨损的担忧。与30-75 μm/年的周围牙列和对牙列相比,全氧化锆冠无磨损的临床长期影响仍然缺乏文献记载。搪瓷探针在用对立的单片氧化锆进行体外疲劳试验后,有大量裂纹形成的报道。体外和临床研究表明,只有加强贴面材料的结构才能防止碎裂。本文比较了底质氧化锆贴面Primero搪瓷(PR)和内质氧化锆贴面Ceramco PFZ和CerconCeram S (CR1和CR2)的三单元瓷冠桥的疲劳性能,评估了瓷贴面氧化锆冠桥的认知设计和制造的可能性,并扩大了它们的应用范围。对这三种瓷器分别进行了4次8次3单元桥的疲劳试验,并进行了参考。结果表明,PR瓷桥具有有效的止裂效果,而CR1和CR2瓷桥存在断裂现象。我们得出结论,碎裂主要与瓷器有关。牙本质氧化锆核的认知设计和制造将导致具有自然美学的假体修复(PRIMERO)。