Acta Biomaterialia Odontologica Scandinavica最新文献_第6页

In vitro element release and biological aspects of base-metal alloys for metal-ceramic applications. 金属陶瓷用贱金属合金的体外元素释放和生物学特性。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2015-09-30 eCollection Date: 2015-12-01 DOI: 10.3109/23337931.2015.1069714

Charlotta Holm, Else Morisbak, Torill Kalfoss, Jon E Dahl

{"title":"In vitro element release and biological aspects of base-metal alloys for metal-ceramic applications.","authors":"Charlotta Holm, Else Morisbak, Torill Kalfoss, Jon E Dahl","doi":"10.3109/23337931.2015.1069714","DOIUrl":"https://doi.org/10.3109/23337931.2015.1069714","url":null,"abstract":"Objective: The aims of this study were to investigate the release of element from, and the biological response in vitro to, cobalt-chromium alloys and other base-metal alloys used for the fabrication of metal-ceramic restorations. Material and methods: Eighteen different alloys were investigated. Nine cobalt-chromium alloys, three nickel-chromium alloys, two cobalt-chromium-iron alloys, one palladium-silver alloy, one high-noble gold alloy, titanium grade II and one type III copper-aluminium alloy. Pure copper served as positive control. The specimens were prepared according to the ISO standards for biological and corrosion testing. Passive leaching of elements was measured by using Inductively Coupled Plasma - Mass Spectrometry (ICP-MS) after incubation in cell culture media, MEM, for 3 days. Corrosion testing was carried out in 0.9% sodium chloride (NaCl) and 1% lactic acid for 7 days, and the element release was measured by Inductively Coupled Plasma - Optical Emission Spectroscopy (ICP-OES). The biological response from the extract solutions was measured though MTT cytotoxicity testing and the Hen's egg test-chorio-allantoic membrane (HET-CAM) technique for irritationt. Results: The corrosion test showed similar element release from base-metal alloys compared to noble alloys such as gold. Apart from the high-copper alloy, all alloys expressed low element release in the immersion test, no cytotoxic effect in the MTT test, and were rated non-irritant in the HET-CAM test. Conclusions: Minimal biological response was observed for all the alloys tested, with the exception of the high-copper alloy.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"1 2-4","pages":"70-75"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/23337931.2015.1069714","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35112472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Bond durability of contemporary adhesive systems to pulp chamber dentin. 当代粘合剂系统与牙本质的粘合耐久性。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2015-09-30 eCollection Date: 2015-12-01 DOI: 10.3109/23337931.2015.1075887

Muhammet Kerim Ayar

{"title":"Bond durability of contemporary adhesive systems to pulp chamber dentin.","authors":"Muhammet Kerim Ayar","doi":"10.3109/23337931.2015.1075887","DOIUrl":"https://doi.org/10.3109/23337931.2015.1075887","url":null,"abstract":"Objective: The purpose of this study was to evaluate long-term bond strengths of dentin adhesive systems, which include one-step self-etch adhesive systems (Optibond All-in-one, Kerr; Adper Prompt L-POP, 3 M ESPE), a three-step etch-and-rinse adhesive (Optibond FL, Kerr) and two-step self-etch adhesive (AdheSE Bond, Ivoclar), applied to pulp chamber dentin surfaces after 12-month water storage by using microtensile bond strength (µTBS) test. Materials and methods: Dentin adhesive systems were applied to unprepared pulp chamber dentin surfaces according to manufacturer's directions, respectively (n = 5). After applying adhesive systems, composite buildups were done incrementally. Bond strengths to pulp chamber dentin surfaces were determined using µTBS test after water storage for 24 h and 12 month. Kruskal-Wallis analysis and Mann-Whitney U-test for pairwise comparisons were used to determine statistical differences in µTBS between the groups at a significance level of 5%. Results: There were no significant differences in µTBS between storage periods for tested adhesives regardless adhesive class. Conclusion: Bond durability of tested adhesive systems, including one-bottle self-etch adhesives with pulp chamber dentin surfaces, may be considered stable after 12-month water storage. Therefore, one-step self-etch, also called \"user-friendly\" adhesives may perform and traditional three-step etch-and-rinse adhesives in the long-term when used for bonding to pulp chamber dentin surfaces.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"1 2-4","pages":"76-80"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/23337931.2015.1075887","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35112473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Microhardness evaluation of silorane and methacrylate composites submitted to erosion and abrasion processes. 硅烷和甲基丙烯酸酯复合材料在侵蚀和磨损过程中的显微硬度评价。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2015-09-21 eCollection Date: 2015-12-01 DOI: 10.3109/23337931.2015.1084884

Eloá Aguiar Gazola, Marcos Augusto Rego, William Cunha Brandt, Maria Beatriz Freitas D'Arce, Priscila Christiane Suzy Liporoni

{"title":"Microhardness evaluation of silorane and methacrylate composites submitted to erosion and abrasion processes.","authors":"Eloá Aguiar Gazola, Marcos Augusto Rego, William Cunha Brandt, Maria Beatriz Freitas D'Arce, Priscila Christiane Suzy Liporoni","doi":"10.3109/23337931.2015.1084884","DOIUrl":"https://doi.org/10.3109/23337931.2015.1084884","url":null,"abstract":"Objective: The aim of this study was to evaluate the Knoop hardness number (KHN) of methacrylate (MC) and silorane (SC) composites after being submitted to erosion and abrasion processes. Material and methods: Forty samples were made with each composite: MC and SC. The samples were divided into eight groups (n = 10) according to the type of composite (G1-G4, MC; G5-G8, SC) and the beverages involved in the erosion process (G1 and G5 - Control (C), without erosion, with abrasion; G2 and G6 - Orange Juice (OJ), abrasion; G3 and G7 - Smirnoff Ice® (SI), abrasion; G4 and G8 - Gatorade® (GA), abrasion). The KHN test was performed 24 h after the last cycle of erosion/abrasion. Results: The MC groups showed smaller KHN values for the SI group (p < 0.05) when compared to the Control and OJ groups; however, for the SC groups, no differences were found (p > 0.05). Conclusion: Methacrylate composite when submitted to acidic beverages erosive challenge combined with abrasive process might alter its surface microhardness. However, the beverages used in the present study were not able to interfere in silorane composite surface microhardness.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"1 2-4","pages":"66-69"},"PeriodicalIF":0.0,"publicationDate":"2015-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/23337931.2015.1084884","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35114147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Antibacterial activity of gold-titanates on Gram-positive cariogenic bacteria. 钛酸金对革兰氏阳性龋齿细菌的抑菌活性。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2015-09-18 eCollection Date: 2015-12-01 DOI: 10.3109/23337931.2015.1084883

Trinuch Eiampongpaiboon, Whasun O Chung, James D Bryers, Kwok-Hung Chung, Daniel C N Chan

{"title":"Antibacterial activity of gold-titanates on Gram-positive cariogenic bacteria.","authors":"Trinuch Eiampongpaiboon, Whasun O Chung, James D Bryers, Kwok-Hung Chung, Daniel C N Chan","doi":"10.3109/23337931.2015.1084883","DOIUrl":"https://doi.org/10.3109/23337931.2015.1084883","url":null,"abstract":"Objective: Gram-positive cariogenic bacteria are etiological agents in dental caries; therefore, strategies to inhibit these bacteria to reduce the incident of this disease have intensified. In this study, we investigated antibacterial activities of titanates and gold-titanates against Lactobacillus casei (Lc) and Streptococcus mutans (Sm). Materials and methods: Monosodium titanate (MST), nanomonosodium titanate (nMST) and amorphous peroxo-titanate (APT), which are inorganic compounds with high-binding affinity for specific metal ions, were used. Total bacterial proteins were measured to represent bacterial cell mass after 24 h incubation with gold-titanates. We further examined the effect of nMST-Au(III) concentrations (10,200,400 mg/L) on Lc and Sm cell viability over time via Live/Dead fluorescent staining and colony forming units (CFUs). Transmission electron microscopy (TEM) was used to determine specific locations on the bacterial cells affected by the nMST-Au(III). Results: We found all gold-titanates and APT alone reduced bacterial protein for Lc (p value <0.001) while only MST-Au(III) and nMST-Au(III) affected Sm growth (p value <0.001). Overall, nMST-Au(III) showed the most effectiveness against both Lc and Sm at 400 mg/L. The Live/Dead staining showed all concentrations of nMST-Au(III) affected Lc growth but only 200 and 400 mg/L nMST-Au(III) interrupted Sm growth. The growth curves based on CFUs/mL showed all nMST-Au(III) concentrations affected growth of both Lc and Sm. TEM images showed nMST-Au(III) attached to Lc and Sm cell wall and were internalized into both cells.Conclusions: nMST-Au(III) demonstrated potential antimicrobial activity against Gram-positive cariogenic bacteria. These results support further development of nMST-Au(III) as a potential novel material to prevent dental caries.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"1 2-4","pages":"51-58"},"PeriodicalIF":0.0,"publicationDate":"2015-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/23337931.2015.1084883","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35114145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Visible light cure characteristics of a cycloaliphatic polyester dimethacrylate alternative oligomer to bisGMA. 一种环脂肪族聚酯二甲基丙烯酸酯替代bisGMA的低聚物的可见光固化特性。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2015-09-18 eCollection Date: 2015-12-01 DOI: 10.3109/23337931.2015.1085806

Tritala K Vaidyanathan, Jayalakshmi Vaidyanathan

{"title":"Visible light cure characteristics of a cycloaliphatic polyester dimethacrylate alternative oligomer to bisGMA.","authors":"Tritala K Vaidyanathan, Jayalakshmi Vaidyanathan","doi":"10.3109/23337931.2015.1085806","DOIUrl":"https://doi.org/10.3109/23337931.2015.1085806","url":null,"abstract":"Objective: The goal of this study was to characterize the light curing characteristics of a new oligomer PEM-665 designed to be used as an alternative monomer to BisGMA. Materials and methods: PEM-665 (P) and BisGMA (B) solutions were prepared with triethylene glycol dimethacrylate (T) diluent in different weight proportions (70/30 and 50/50). Solutions containing 70% P and 30% T were designated as 70PT, 70%B and 30%T as 70BT, 50%P and 50%T as 50PT and 50%B and 50%T as 50BT. The initiators were CQ (EDMAB was used as amine accelerator for CQ) and DPO in 1% concentration. Eight solutions were prepared in a factorial design: 70PT/DPO; 70PT/CQ; 50PT/DPO; 50PT/CQ; 70BT/DPO; 70BT/CQ; 50BT/DPO; 50BT/CQ. BISCO VIP visible light was used to cure the monomer solutions using 30 s exposure time and 400 W power setting. TA Instruments Differential Scanning Calorimeter (DSC 2910) was used to determine the heat of cure (J/g) during polymerization at 37 °C, from which molar heat of cure (kJ/mole) and %Conversion values were estimated. Results: Range of mean values as a function monomer selections were: heat of cure (J/g): 161.7 for 70PT/DPO system to 198.6 for 50BT/CQ system; molar heat of cure (kJ/mole): 67.3 for 70BT/DPO to 78.86 for 50PT/CQ; % conversion: 59.9 for 70BT/DPO to 70.3 for 50PT/CQ. Analysis of variance and Tukey HSD pairwise contrast showed statistically significant differences between % conversion means of PEM and BisGMA mixtures, with PEM mixtures showing significantly higher mean values. Conclusions: The results suggest that PEM-665 is a promising candidate material for dental polymer applications.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"1 2-4","pages":"59-65"},"PeriodicalIF":0.0,"publicationDate":"2015-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/23337931.2015.1085806","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35114146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The effects of sintering temperature and duration on the flexural strength and grain size of zirconia. 烧结温度和烧结时间对氧化锆抗弯强度和晶粒尺寸的影响。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2015-08-03 eCollection Date: 2015-12-01 DOI: 10.3109/23337931.2015.1068126

Nuri Murat Ersoy, Hasan Murat Aydoğdu, Beyza Ünalan Değirmenci, Neslihan Çökük, Müjde Sevimay

{"title":"The effects of sintering temperature and duration on the flexural strength and grain size of zirconia.","authors":"Nuri Murat Ersoy, Hasan Murat Aydoğdu, Beyza Ünalan Değirmenci, Neslihan Çökük, Müjde Sevimay","doi":"10.3109/23337931.2015.1068126","DOIUrl":"https://doi.org/10.3109/23337931.2015.1068126","url":null,"abstract":"Objective: This study investigated the effect of different sintering temperatures and times on the flexural strength and grain size of zirconia. Material and methods: Zirconia specimens (In-Coris ZI, In-Coris TZI, 120 samples) were prepared in a partially sintered state. Subsequently, the specimens were randomly divided into three groups and sintered at different final sintering temperatures and for various durations: 1510 °C for 120 min, 1540 °C for 25 min and 1580 °C for 10 min. Three-point flexural strength (for 120 samples, 20 samples per group) was measured according to the ISO 6872: 2008 standards. The grain sizes were imaged by scanning electron microscopy (SEM) and the phase transitions were determined by X-ray diffraction (XRD). The data were analyzed using one-way ANOVA and Duncan tests (p < 0.05). Results: The highest flexural strength was observed in ZI and TZI samples sintered at 1580 °C for 10 min. The differences between the ZI samples sintered at 1510 °C for 120 min and those sintered at 1540 °C for 25 min were statistically insignificant. Also, TZI samples sintered at 1510 °C for 120 min and those sintered at 1540 °C for 25 min also did not show any statistically significant differences. There were no visible differences in the grain sizes between the ZI and TZI specimens. The XRD patterns indicated similar crystalline structure for both materials subjected to the three different procedures. Conclusions: The results of this study showed that experimented high sintering temperature and short sintering time combination increases the flexural strength of zirconia.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"1 2-4","pages":"43-50"},"PeriodicalIF":0.0,"publicationDate":"2015-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/23337931.2015.1068126","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35114144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 76

Fracture of porcelain-veneered gold-alloy and zirconia molar crowns using a modified test set-up. 使用改良的测试装置观察瓷贴面金合金和氧化锆磨牙冠的断裂。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2015-07-16 eCollection Date: 2015-01-01 DOI: 10.3109/23337931.2015.1057825

Christel Larsson, Marko Drazic, Eddie Nilsson, Per Vult von Steyern

{"title":"Fracture of porcelain-veneered gold-alloy and zirconia molar crowns using a modified test set-up.","authors":"Christel Larsson, Marko Drazic, Eddie Nilsson, Per Vult von Steyern","doi":"10.3109/23337931.2015.1057825","DOIUrl":"https://doi.org/10.3109/23337931.2015.1057825","url":null,"abstract":"Objective: The main aim of this study was to compare fracture load and fracture mode of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and metal-ceramic (MC) molar crowns using a modified test set-up to produce fractures similar to those seen in vivo, i.e. fractures of the veneering material rather than complete fractures. Materials and methods: 13 high-noble-alloy MC and 13 Y-TZP molar crowns veneered with porcelain were manufactured. The crowns were artificially aged before final load to fracture. Load was applied using a 7 mm diameter steel ball exerting force on the cusps with stresses directed toward the core-veneer interface. Fracture surface analysis was performed using light- and scanning electron microscopy. Results: The test design produced fractures of the veneering material rather than complete fractures. MC crowns withstood significantly (p > 0.001) higher loads (mean 2155 N) than Y-TZP (mean 1505 N) crowns, yet both endure loads sufficient for predictable clinical use. Fracture mode differed between MC and Y-TZP. MC crowns exhibited fractures involving the core-veneer interface but without core exposure. One Y-TZP crown suffered a complete fracture, all others except one displayed fractures of the veneering material involving the core-veneer interface with core exposure. Conclusions: The test set-up produces fractures similar to those found in vivo and may be useful to evaluate the core-veneer interface of different material systems, both metals and ceramics. The study confirms suggestions from previous studies of a weaker core-veneer bond for Y-TZP compared to MC crowns.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"1 1","pages":"35-42"},"PeriodicalIF":0.0,"publicationDate":"2015-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/23337931.2015.1057825","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35114143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Effect of various intracanal medicaments on the bond strength of self-adhesive resin cement to root canal dentin. 不同管内药物对自粘树脂水泥与根管牙本质结合强度的影响。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2015-06-09 eCollection Date: 2015-01-01 DOI: 10.3109/23337931.2015.1031764

Hakan Arslan, Hüseyin Sinan Topcuoglu, Gokhan Saygili, Oznur Tuncay, Yavuz Altintop

{"title":"Effect of various intracanal medicaments on the bond strength of self-adhesive resin cement to root canal dentin.","authors":"Hakan Arslan, Hüseyin Sinan Topcuoglu, Gokhan Saygili, Oznur Tuncay, Yavuz Altintop","doi":"10.3109/23337931.2015.1031764","DOIUrl":"https://doi.org/10.3109/23337931.2015.1031764","url":null,"abstract":"Objective: It has been shown that the irrigating solutions and medicament used during root canal treatment may affect the bonding strength. The aim of this study was to evaluate the effect of triple antibiotic paste (TAP), double antibiotic paste (DAP) and calcium hydroxide (CH) on the bond strength to root dentin of self-adhesive resin cement. Materials and methods: Forty-eight single-rooted human teeth were prepared and randomly divided into one control and three experimental groups (dressing with TAP, DAP or CH). After removal of intracanal dressing, post-spaces were created and fiber posts cemented to the root canal using a self-adhesive resin cement. A push-out test was performed. The data obtained from the push-out test were analyzed using analysis of variance and Bonferroni post hoc tests (p = 0.05). Results: TAP decreased the bond strength of self-adhesive resin cement bond strength to root dentin compared to the control group (p = 0.012), while CH and DAP did not influence this (p > 0.05). The majority of specimens exhibited adhesive failures. Conclusions: TAP decreased the bond strength of self-adhesive to the root dentin compared to the control group.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"1 1","pages":"18-21"},"PeriodicalIF":0.0,"publicationDate":"2015-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/23337931.2015.1031764","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35114140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Influence of peak oral temperatures on veneer-core interface stress state. 峰值口温对贴面-芯界面应力状态的影响。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2015-04-29 eCollection Date: 2015-01-01 DOI: 10.3109/23337931.2015.1039536

Massimo Marrelli, Antonella Pujia, Davide Apicella, Salvatore Sansalone, Marco Tatullo

{"title":"Influence of peak oral temperatures on veneer-core interface stress state.","authors":"Massimo Marrelli, Antonella Pujia, Davide Apicella, Salvatore Sansalone, Marco Tatullo","doi":"10.3109/23337931.2015.1039536","DOIUrl":"https://doi.org/10.3109/23337931.2015.1039536","url":null,"abstract":"Objective: There is a growing interest for the use of Y-TZP zirconia as core material in veneered all-ceramic prostheses. The objective of this study was to evaluate the influence of CET on the stress distribution of a porcelain layered to zirconia core single crowns by finite elements analysis. Material and methods: CET of eight different porcelains was considered during the analysis. Results: Results of this study indicated that the mismatch in CET between the veneering porcelain and the Y-TZP zirconia core has to be minimum (0.5-1 μm/mK) so as to decrease the growing of residual stresses which could bring chipping. Conclusions: The stress state due to temperature variation should be carefully taken into consideration while studying the effect of mechanical load on zirconia core crown by FEA. The interfacial stress state can be increased by temperature variation up to 20% with respect to the relative failure parameter (interface strength in this case). This means that stress due to mechanical load combined to temperature variation-induced stress can lead porcelain veneer-zirconia core interfaces to failure.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"1 1","pages":"22-28"},"PeriodicalIF":0.0,"publicationDate":"2015-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/23337931.2015.1039536","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35114141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficacy of whitening oral rinses and dentifrices on color stability of bleached teeth. 美白漱口水和牙膏对漂白牙齿颜色稳定性的影响。

Acta Biomaterialia Odontologica Scandinavica Pub Date : 2015-04-27 eCollection Date: 2015-01-01 DOI: 10.3109/23337931.2015.1039537

Muhammet Karadas

{"title":"Efficacy of whitening oral rinses and dentifrices on color stability of bleached teeth.","authors":"Muhammet Karadas","doi":"10.3109/23337931.2015.1039537","DOIUrl":"https://doi.org/10.3109/23337931.2015.1039537","url":null,"abstract":"Abstract Objective: This study aimed to evaluate the effect of whitening toothpastes and mouthrinses on the color stability of teeth bleached with 16% carbamide peroxide (CP) after immersion in coffee solution. Materials and methods: Specimens obtained from bovine incisors were bleached with 16% CP for 14 days. After bleaching, the specimens were stained in coffee solution for 24 h and randomly divided into eight groups according to the following products (n = 10): distilled water (control group, DW), Scope White mouthrinse (SW), Crest 3D White mouthrinse (CWR), Crest 3D White toothpaste (CWT), Crest 3D White toothpaste and Crest 3D White mouthrinse (CWT + CWR), Listerine Whitening toothpaste (LWT), Listerine Whitening mouthrinse (LWR), and Listerine Whitening mouthrinse and Listerine Whitening toothpaste (LWR + LWT). Color measurements were conducted using a spectrophotometer. The data were assessed by analysis of variance for repeated measures and Tukey’s multiple comparison test (p < 0.05). Results: Immersion in coffee solution after bleaching caused perceptible staining on tooth specimens (ΔE > 3.46). The whitening effect of CWR on teeth stained after bleaching was significantly greater than that in the other groups (p < 0.001). Tooth whitening (ΔE) in each group showed no significant difference from 6 to 12 weeks (p > 0.05). The combination of mouthrinse and toothpaste did not increase the degree of tooth whitening. Conclusion: Whitening mouthrinse and toothpaste had similar effects on the control group in terms of whitening of teeth stained after bleaching. Nevertheless, Crest 3D White mouthrinse produced the greatest recovery whitening effect among all the products tested.","PeriodicalId":6997,"journal":{"name":"Acta Biomaterialia Odontologica Scandinavica","volume":"1 1","pages":"29-34"},"PeriodicalIF":0.0,"publicationDate":"2015-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/23337931.2015.1039537","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35114142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12