Made available in DSpace on 2015-04-14T13:30:35Z (GMT). No. of bitstreams: 1
459296.pdf: 283193 bytes, checksum: 3d97b7d2dd51eab591a5bbae03076040 (MD5)
Previous issue date: 2014-02-25 / The aim of the study was to evaluate the fracture resistance of ceramic crowns using Cerec CAD-CAM system on solid pillars. Sixty replica synocta implant and RN solid abutment were embedded in acrylic resin, being randomly assigned (n=20 per group). Three types of ceramics were used: Mark II (feldspar), IPS Empress CAD (leucite) and IPS e.max CAD (lithium disilicate). The crowns were fabricated by CAD-CAM system using the Cerec software version 4.1. After receiving glaze and were cemented with RelyX U200 cement under load of 1 Kg Half of the specimens of each ceramic was subjected to endurance EMIC DL-2000 test fracture in a universal testing machine with a speed of 1 mm / minute and the other half after 1,000,000 cycles of mechanical stress with a load of 100 N. According to two-way ANOVA, the interaction between the material and mechanical cycling was significant (p = 0.0001). According to Tukey test (α = 5%) the fracture toughness without mechanical cycling and mechanical cycling, respectively, of Mark II (405N/454N) was statistically lower than ceramic IPS Empress CAD (1169N/1240N) and IPS e.max CAD (1378N/1025N) (p < 0.05). The ceramic IPS Empress CAD and IPS e.max CAD not differ statistically (p > 0.05). There was no statistical difference in the resistance to cyclic loading with and without fracture to the Mark II and IPS Empress CAD (p > 0.05, Student's t test) ceramics. For ceramic IPS e.max CAD, the fracture resistance without mechanical cycling was statistically superior to that obtained with cycling (p < 0.05). The ceramic IPS Empress CAD and IPS e.max CAD showed higher fracture resistance compared to ceramic Mark II. The cyclic loading negatively influenced only IPS e.max CAD. / O objetivo do estudo foi avaliar a resist?ncia ? fratura de coroas cer?micas utilizando o sistema CAD-CAM Cerec sobre pilares s?lidos. Sessenta r?plicas de implante synocta RN e pilar s?lido foram inclu?dos em resina acr?lica autopolimeriz?vel, sendo divididas aleatoriamente (n=20 por grupo). Tr?s tipos de cer?micas foram utilizadas: Mark II (feldsp?tica), IPS Empress CAD (leucita) e IPS e.max CAD (dissilicato de l?tio). As coroas foram confeccionadas atrav?s do sistema CAD-CAM utilizando o software Cerec vers?o 4.1. Ap?s receberam glaze e foram cimentadas com RelyX U200 sob carga de cimenta??o de 1 Kg. Metade dos corpos de prova de cada cer?mica foi submetida ao teste de resist?ncia ? fratura em m?quina de ensaio universal EMIC-DL 2000 com velocidade de 1 mm/minuto e, a outra metade, ap?s 1.000.000 de ciclos de fadiga mec?nica com carga de 100 N. Segundo ANOVA de duas vias, a intera??o entre material e ciclagem mec?nica foi significativa (p=0,0001). De acordo com o teste de Tukey (α=5%) a resist?ncia ? fratura, sem ciclagem mec?nica e com ciclagem mec?nica respectivamente, da cer?mica Mark II (405N/454N) foi estatisticamente menor que as cer?micas IPS Empress CAD (1169N/1240N) e IPS e.max CAD (1378N/1025N) (p<0,05). As cer?micas IPS Empress CAD e IPS e.max CAD n?o diferiram estatisticamente entre si (p>0,05). N?o houve diferen?a estat?stica na resist?ncia ? fratura sem e com ciclagem mec?nica para as cer?micas Mark II e IPS Empress CAD (p>0,05, teste t-student). Para a cer?mica IPS e.max CAD, a resist?ncia ? fratura sem ciclagem mec?nica foi estatisticamente superior ? obtida com ciclagem (p<0,05). As cer?micas IPS Empress CAD e IPS e.max CAD apresentaram maior resist?ncia ? fratura quando comparadas com a cer?mica Mark II. A ciclagem mec?nica influenciou negativamente apenas a cer?mica IPS e.max CAD.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1263 |
| Date | 25 February 2014 |
| Creators | Stona, Deborah |
| Contributors | Spohr, Ana Maria |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, BR, Faculdade de Odontologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -8096554818733665164, 500, 600, 4673435736271820140 |
Page generated in 0.0023 seconds