Abstract The aims of this study were to evaluate the treatment need of fixed bridges according to the distribution of pontics in dentition in different age groups, and to investigate the primary and late complications and survival of the conventional fixed metal ceramic prostheses, as well as patients' satisfaction with the prosthetic treatment. The whole material consisted of the patients treated with fixed metal ceramic prostheses by undergraduate students at the Institute of Dentistry during the years 1984 - 1996. There were altogether 772 patients, 460 women (60 %) and 312 men (40 %). Their mean age was 47 years (23 - 81 years). Altogether 944 single metal ceramic crowns and 543 fixed bridges (1374 abutments and 807 pontics) were prepared. It can be concluded that the fixed bridges are most often prepared to replace upper first premolars and lower first molars also in the future. The most usual primary complications related to fixed bridges occurred during preprosthetic endodontic treatment of abutment teeth and during the preparation of the root canals. Previous restoration of the prepared tooth does not have any marked effect on the prognosis of single crowns with dowels, although anatomically complicated upper lateral incisors and upper first premolars need special attention in the treatment planning. Patients were satisfied with aesthetics and function of the fixed metal ceramic prostheses. Late complications found in clinical examinations were few, and the survival rate for the fixed metal ceramic bridge prostheses was calculated to be 84 % after 10 years, long fixed bridges having a lower survival than the shorter ones. The treatment need for conventional fixed bridges seems to be highest among patients over 50 years of age in the future. Age does not influence the longevity of the fixed prostheses, but basic circumstances of the mouth, especially low secretion of saliva affected by diseases and/or medications and high scores of lactobacilli and streptococcus mutans of the saliva seem to decrease the survival.

Magister Scientiae Dentium - MSc(Dent) / Aim: The aim of this study was to evaluate, in-vitro, the shear bond strength (SBS) and the resultant failure pattern after debonding of metal orthodontic brackets bonded with TransbondTM XT adhesive resin cement and RelyXTM Unicem 2 self-adhesive resin cement to pre-treated (35% ortho-phosphoric acid and silane coupling agent application) IPS eMax and porcelain veneered zirconia crowns. Material and methodology: A Typhodont maxillary lateral incisor was used and prepared in a conventional manner to receive a full ceramic crown. A CAD (computer aided design)/ CAM (computer aided manufacturing) machine was used to scan the prepared tooth and manufacture 40 IPS eMax crowns and 40 porcelain veneered zirconia crowns. Half the number of IPS eMax crown specimens (ie. 20) and half the number of porcelain veneered zirconia crown specimens (ie. 20) were thermocycled (ie. to mimic thermal changes which occur in the mouth), from 5 to 55o for 500 cycles as recommended by the International Organization for Standardization (ISO 6872, 2008). The remaining 20 IPS eMax crown specimens and 20 porcelain veneered zirconia crown specimens remained new and unexposed to thermal changes. The facial surfaces of all the thermocycled and non-thermocycled crown specimens were then etched. Etching of all the ceramic bonding surfaces was performed by the application of 35 per cent ortho-phosphoric acid liquid for 2 minutes, followed by a thin layer of a ceramic primer. A lateral incisor metal bracket with a bracket base area of 9mm2 (as confirmed by the manufacturer) was bonded to each of the etched and silane treated ceramic crown specimens and separated in the following manner: Group 1: (10 thermocycled, etched and silane treated IPS eMax and 10 thermocycled, etched and silane treated porcelain veneered zirconia crown specimens) RelyX™ Unicem 2 self-adhesive resin cement was used to bond the bracket to the ceramic crown specimens, Group 2: (10 thermocycled, etched and silane treated IPS eMax and 10 thermocycled, etched and silane treated porcelain veneered zirconia crown specimens) Transbond™ XT light cure adhesive primer was first applied onto the bonding surface of the crowns and then Transbond™ XT adhesive resin was used to bond the bracket to the ceramic crown specimens, Group 3: (10 non-thermocycled, etched and silane treated IPS eMax and 10 non-thermocycled, etched and silane treated porcelain veneered zirconia crown specimens) RelyX™ Unicem 2 self-adhesive resin cement was used to bond the bracket to the ceramic crown specimens, Group 4: (10 non-thermocycled, etched and silane treated IPS eMax and 10 non-thermocycled, etched and silane treated porcelain veneered zirconia crown specimens) Transbond™ XT light cure adhesive primer was first applied onto the bonding surface of the crowns and then Transbond™ XT adhesive resin cement was used to bond the bracket to the ceramic crown specimens. After bonding all samples were stored in distilled water for 24 hours before being submitted to the shear bond strength test. Debonding forces in Newtons (N) was determined by using a shear testing machine and converted into Mega Pascals (MPa). Results: The results after debonding were compared. The mean shear bond strength for RelyXTM Unicem 2 self-adhesive resin cement bonded to the all ceramic non-thermocycled crowns (Group 3) ranged from a low of 5.1 MPa (45.5 Newtons) when brackets were bonded to the IPS eMax crowns to a high of 5.8 MPa (51.9 Newtons) when brackets were bonded to the porcelain veneered zirconia crowns. The mean shear bond strength for Transbond XT adhesive resin cement bonded to the all ceramic non-thermocycled crowns (Group 4) ranged from a low of 6.4 MPa (57.3 Newtons) when brackets were bonded to the porcelain veneered zirconia crowns to a high of 8.1 MPa (72.7 Newtons) when brackets were bonded to the IPS eMax crowns. The side by side Box-and-Whisker plots of the shear bond strengths show wide and overlapping dispersions of the crown/adhesive resin combinations which consequently lessen the probability of significant differences between the crown/adhesive resin combinations in all 4 groups. According to the Kruskal-Wallis test (p < 0.05), and the Bonferroni Test the non-thermocycled crown/adhesive resin combinations do not differ significantly. Study of the mean ARI (Adhesive Remnant Index) values for the non-thermocycled crown/adhesive combinations shows that brackets bonded with Rely-XTM Unicem 2 to non-thermocycled porcelain veneered zirconia crowns failed entirely at the ceramic/adhesive interface and for all the other non-thermocycled ceramic/adhesive combinations most of the failures of the bond (70%) occurred at the bracket/adhesive interface, ie. cohesive fractures within the composite resin. No cohesive fractures of the porcelain crowns were noted. The results of the thermocycled groups (Group 1 and Group 2) show the TransbondTM XT/non-thermocycled IPS eMax crown combination yielded the highest overall mean shear bond strength of 8.1 MPa (72.7 Newtons) but dropped to a mean shear bond strength of 5.1 MPa (46.1 Newtons) (36.4% drop in shear bond strength) when the crowns were thermocycled prior to bonding. The TransbondTM XT/non-thermocycled porcelain veneerd zirconia crown combination yielded the second highest overall mean shear bond strength of 6.4 MPa (57.3 Newtons) and dropped to a mean shear bond strength of 5.1 MPa (45.8 Newtons) (19.3% drop in shear bond strength) when the crowns were thermocycled prior to bonding. The RelyXTM Unicem 2/non-thermocycled porcelain veneered zirconia crown combination yielded the third highest overall mean shear bond strength of 5.8 MPa (51.9 Newtons) but dropped significantly to a mean shear bond strength of 3.2 MPa (29.1 Newtons) (a significant 43.8% drop in shear bond strength) when the crowns were thermocycled prior to bonding. Lastly, the RelyXTM Unicem 2/non-thermocycled IPS eMax crown combination yielded the fourth highest mean shear bond strength of 5.1MPa (45.5 Newtons) but dropped to a mean shear bond strength of 4.9 MPa (44.5 Newtons) (a drop in shear bond strength of only 3%) when the crowns were thermocyled prior to bonding. Relaxing the significance level (p-value) somewhat demonstrates the negative influence of thermocycling on the shear bond strength of the crown/adhesive combinations. The non-thermocycled all ceramic crown/adhesive combinations showed mean ARI values of between 1.3 and 2.1 indicating cohesive fractures within the composite resin and efficient bonding of the adhesive material to the porcelain surface. However, all the thermocycled all ceramic crown/adhesive treatment combinations showed mean ARI values of between 0 and 0.8 indicating a bond failure between adhesive and porcelain and highlighting the negative influence of thermocycling on bond strength of both adhesive resin cements. Conclusion: Within the limitations of this study, it can be concluded that: 1.There was no significant difference in the shear bond strengths of metal orthodontic brackets bonded with RelyXTM Unicem 2 self-adhesive resin cement and metal orthodontic brackets bonded with TransbondTM XT adhesive resin cement to IPS eMax and porcelain-veneered zirconia crowns which were conditioned with 35 % phosphoric acid and a silane coupling agent. 2. Conditioning the porcelain surface with 35% phosphoric acid and a silane coupling agent (which is safer to use than Hydrofluoric acid) is sufficient for bonding metal orthodontic brackets to all ceramic crowns, and should make it simpler for clinicians to remove the remaining adhesive from the porcelain surface after debonding. 3. The negative influence of thermocycling prior to bonding can be seen on shear bond strength values. 4. Most of the failures of the bond occurred at the ceramic/adhesive interface and cohesive fractures within the composite resin. No cohesive fractures of the porcelain crowns were noted.

Orientador: Marco Antonio [Unesp] Bottino / Resumo: Apesar do aumento do uso de coroas monolíticas, seu desempenho, em diferentes aspectos, ainda não foi determinado. Inicialmente, este projeto investigou o comportamento biomecânico de diferentes coroas monolíticas convencionais sobre dentes e a distribuição de tensões na camada de cimento (Artigo 1). Como objetivo principal, este estudo avaliou o efeito do princípio do mínimo preparo dental no comportamento biomecânico, confiabilidade e translucidez de coroas monolíticas posteriores em cerâmica. No entanto, para definir o substrato a ser utilizado para receber as coroas usinadas, uma análise complementar foi desenvolvida para observar o comportamento da restauração sobre diferentes substratos através da análise por elementos finitos (Artigo 2). E para o Artigo 3, cento e vinte e seis coroas foram fabricadas e divididas (n = 21 / gr) de acordo com o material (zircônia de alta translucidez -YZHT, silicato de lítio reforçado com zircônia - ZLS e cerâmica híbrida -HC) e espessura (0,5 – subgrupo .5 ou 1 mm – subgrupo 1). A concentração de tensão de tração foi calculada pelo método dos elementos finitos, as coroas adesivamente cimentadas foram fadigadas pelo teste step-stress para calcular a confiabilidade de missões a 600 e 900 N a 100.000 ciclos; e, a translucidez foi analisada em 10 discos de cada material e espessura. Maior concentração de tensão de tração foi observada em coroas mais finas e com módulo de elasticidade mais alto. As coroas YZHT foram suspensas quando a fadiga ... (Resumo completo, clicar acesso eletrônico abaixo) / Doutor

Magister Scientiae Dentium - MSc(Dent) / CAD/CAM crowns have become popular due to the many advantages associated with this technology. Optimal bonding adhesion is crucial for the durability of these indirect restorations and many factors influence this crucial step. Currently, there is no consensus or evidence-based guidelines on the best adhesion protocol for CAD/CAM crowns fabricated from hybrid materials. This study was aimed at investigating the influence of three types of resin cements on the shear bond strength of a hybrid CAD/CAM material in vitro.

No description available.

Purpose: The purpose of this study was to evaluate esthetic posterior stainless steel crowns (EP-SSC) and compare their relative shear strengths.Methods: Sixty EP-SSC were compared. 15 crowns from NuSmile® Primary Crowns, Kinder Krowns, and Dental Innovators 1UP and EC Crowns were studied. The crowns were cemented to a typodont tooth then thermally cycled in water baths to simulate oral conditions. Shear strengths were evaluated by subjecting these crowns to simulated forces of occlusion.Results: The force required to cause shearing of the esthetic facings was statistically significant. With the 1UP crown being significantly weaker than the other crowns tested. Conclusion: The 1 UP crowns failed at lower levels of force than the other types of EP-SSC. The shear strengths for the three other crown types were not statistically different from each other. The esthetic facings do not likely fail from the single point load of a child's bite.

A longevidade das coroas cerâmicas depende, entre outros fatores, de sua adaptação ao pilar, bem como da distribuição das tensões nas mesmas. Não há um consenso sobre a melhor adaptação dos copings de zircônia feitos em CAD/CAM em relação aos métodos convencionais, podendo haver uma influência da contração de sinterização sobre esta. O presente estudo avaliou as alterações dimensionais decorrentes do processo de sinterização em três diferentes marcas comerciais de blocos de zircônia, relacionando-as com a adaptação de copings confeccionados por um sistema CAD/CAM, além de avaliar como a adaptação de tais copings poderia impactar na distribuição de tensões em coroas cerâmicas bi-camadas com estrutura de zircônia. A contração de sinterização das três marcas comerciais de zircônia foi obtida experimentalmente a partir da mensuração de espécimes geométricos. Trinta e seis copings de zircônia confeccionados por CAD/CAM foram divididos em três grupos (n=12): ZMAX a partir de blocos de IPS E.max ZirCad (Ivoclar Vivadent; Liechtenstein); ZYZ blocos de InCeram YZ (Vita Zahnfabrik; Alemanha) e; ZMC zircônia de manufatura controlada (Zirklein/Biodinâmica; Brasil). Os copings foram escaneados em micro-CT antes a após a sinterização para que as alterações dimensionais decorrentes do processo de sinterização fossem obtidas a partir da mensuração de cortes específicos. Os dados das alterações dimensionais obtidos para os espécimes geométricos e para os copings foram confrontados com as taxas de contração de sinterização informadas pelos fabricantes dos blocos de zircônia. Os copings sinterizados foram assentados sobre um pilar de zircônia e levados ao micro-CT para averiguação da adaptação interna e marginal dos mesmos. As mensurações foram realizadas pelo software ImageJ em 33 pontos diferentes. Os dados da adaptação possibilitaram a comparação estatística (p0,05) entre marcas comerciais e locais de mensuração, bem como a comparação entre a adaptação obtida experimentalmente e àquela determinada no software CAD/CAM para confecção dos copings. As imagens de micro-CT dos copings com menor e maior espaçamento foram utilizadas para a construção de modelos de elemento finito tridimensionais visando avaliar a distribuição de tensões em função do espaçamento coping/pilar na região oclusal. A contração de sinterização obtida para os espécimes geométricos foi 21,59±1,14%; 20,63±0,96% e 20,73±0,92% para os grupos ZMAX, ZYZ e ZMC, respectivamente. Todos os grupos apresentaram diferença estatística entre a taxa de contração do fabricante e a obtida experimentalmente. A análise das alterações dimensionais dos copings demonstrou incompatibilidade entre a taxa de contração ocorrida nos copings e àquela informada pelos fabricantes dos grupos ZMAX e ZMC. Também houve diferença entre a taxa de contração dos espécimes geométricos e a dos copings para todos os grupos estudados. Não houve uniformidade de contração de sinterização das paredes dos copings. Não houve diferença estatística entre os grupos para a adaptação marginal, havendo diferença apenas para a adaptação interna e entre as diferentes regiões mensuradas, havendo maior espaçamento na região oclusal. Considerando as diferentes faces axiais do copings, houve maior espaçamento na região vestibular. A comparação entre a adaptação obtida e àquela determinada pelo sistema CAD/CAM demonstrou diferença estatística em determinadas regiões mensuradas para todos os grupos. A avaliação da distribuição de tensões pelo método de elementos finitos demonstrou maior concentração de tensão no modelo com maior espaçamento entre copings e pilar na porção oclusal. Concluiu-se que não houve uniformidade na contração de sinterização, a marca comercial dos blocos de zircônia influenciou na adaptação, os parâmetros de espaçamento copings/pilar determinados no sistema CAD/CAM não foram obtidos na prática e, um maior espaçamento interno entre coping e pilar na região oclusal resultou em maior concentração de tensões na coroa cerâmica. / The longevity of ceramic crowns depends, among other factors, on its fit and the stress distribution. There is no consensus regarding the better fitting of zirconia CAD/CAM made crowns over conventional methods and may be an influence of zirconia sintering shrinkage on the abutment/coping spacing. This study aimed at evaluating the dimensional changes from sintering process of three zirconia blocks trademarks, relating them to the fit of CAD / CAM made zirconia copings, and to evaluate how the fit of such copings could impact on the stress distribution in bilayered Y-TZP based ceramic crowns. The sintering shrinkage of the three trademarks of zirconia was obtained experimentally from the measurement of geometric specimens. Thirty-six zirconia copings made by CAD / CAM were equally divided into three groups (n = 12): ZMAX - from blocks of IPS e.max ZirCAD (Ivoclar Vivadent, Liechtenstein); ZYZ - InCeram YZ blocks (Vita Zahnfabrik, Germany) and; ZMC - controlled manufacturing zirconia (Zirklein/Biodinamica, Brazil). The copings were scanned in micro-CT before and after the sintering so that dimensional changes from the sintering process were obtained from measurements taken from specific slices. Data from dimensional changes obtained for the geometric specimens and for the copings were faced with the sintering shrinkage rates reported by the manufacturers of zirconia blanks. The sintered copings were settled on a zirconia abutment and taken to the micro-CT scanner to evaluate its marginal and internal fit. Thirty three different points were measured using the Image J software. The data enabled the statistical comparison (p 0,05) between trademarks and measurement sites, as well as the comparison between the fit obtained experimentally with that stipulated by the CAD / CAM software. The micro-CT images of copings with smaller and larger cement space were used to build finite element models to evaluate stress distribution as a function of the abutment/coping fit in the occlusal aspect. The sintering shrinkage obtained for the geometric specimens was 21.59 ± 1.14%, 20.63 ± 0.96% and 20.73 ± 0.92% for ZMAX, ZYZ and ZMC groups, respectively. All groups showed statistical difference between the sintering shrinkage rate reported by the manufacturer and those obtained experimentally. The copings dimensional changes analysis showed incompatibility between the rates of shrinkage occurred in copings and to that reported by the manufacturers of ZMAX and ZMC groups. There was also a difference between the sintering shrinkage rate of the geometric specimens and the copings for all groups. In general, the sintering shrinkage of the walls of the copings showed no uniformity. Considering the adaptation of copings, there was no statistical difference between the groups for marginal fit, with differences only for internal fit and between the different regions measured. The thicker gap was found in the occlusal aspect. Considering the different axial aspects of the coping, the thicker spacing was found in the buccal region. The comparison between the fit obtained experimentally with that determined by the CAD/CAM system showed statistically significant differences in certain measured regions for all groups. The evaluation of stress distribution by finite element method showed higher stress concentration in the model with thicker cement space on the occlusal aspect. It was concluded that the sintering shrinkage did not occur uniformly; the adaptation of copings differed from a trademark to another; the obtained fitting did not achieve parameters determined in the CAD / CAM system; and a higher internal spacing between coping and abutment in the occlusal aspect resulted in higher stress concentration in the ceramic bi-layered crowns.

Fraturas completas ou por delaminação são causas frequentes de insucesso entre coroas unitárias cerâmicas. O uso de materiais à base de resina composta, em contraponto à natureza friável das cerâmicas, parece ser uma alternativa para coroas posteriores, uma vez que apresentam processo de fabricação e reparo simplificados. Este estudo avalia a resistência à fadiga de coroas unitárias monolíticas CAD/CAM de resina composta nanocerâmica e cerâmica reforçada por dissilicato de lítio, bem como os danos causados pela aplicação de carga cíclica. Vinte e seis coroas monolíticas (n=13) foram cimentadas sobre réplicas de resina composta de um molar preparado e submetidas à ciclagem mecânica durante 2 milhões de ciclos, sob carga máxima de 350N à frequência de 2 Hz. Não foram observadas fraturas catastróficas ou fratura coesiva das coroas, resultando em sobrevivência de 100% para os dois materiais avaliados. As coroas foram incluídas em resina epóxi e desgastadas progressivamente à procura de danos. Coroas em resina nanocerâmica apresentaram-se íntegras, com trincas do cone externo, trincas do cone interno e com trincas radiais. As coroas em dissilicato de lítio apresentaram trincas do cone externo e interno, algumas atingindo a superfície interna. Os danos receberam escores de acordo com a severidade. Os dados foram submetidos à análise estatística pelo teste de Mann-Whitney (p =0,462), que não revelou diferenças estatísticas em relação aos danos observados. Concluímos que coroas monolíticas em dissilicato de lítio e resina nanocerâmica podem ser utilizadas na região posterior, pois apresentaram resistência à fadiga equivalente, sem diferença estatística entre os danos apresentados. / Bulk fractures or cohesive fractures are frequent complications for ceramic crowns. The use of resin- based materials, in contrast to the brittle nature of ceramics, seems to be an alternative to posterior crowns, since these materials present simplified manufacturing and repair tehniques. This study evaluates the fatigue resistance of monolithic CAD / CAM crowns made of resin nanoceramic and lithium disilicate reinforced ceramic, as well as the damage modes caused by the application of cyclic loading. Twenty-six monolithic crowns (n = 13) were cemented to a composite resin replica of a prepared molar and subjected to cyclic load over 2 million cycles under maximum load of 350N, at a frequency of 2 Hz. The crowns presented no catastrophic failures or cohesive fractures, resulting in survival of 100% for both materials. The crowns were embedded in epoxy resin and gradually grinded for damage analisys. Nanoceramic resin crowns presented no damage, outer cone cracks, inner cone cracks and radial cracks. Lithium disilicate crowns showed outer and inner cone cracks, some of the latter reaching the inner surface. Specimens were scored according to the severity of damage. Data was subjected to Mann-Whitney test (p = 0.462), which revealed no statistical difference. We conclude that lithium disilicate and resin nanoceramic monolithic crowns can be used in the posterior area, since they presented comparable fatigue resistance, with no statistical difference between damage modes.

This dissertation investigates the role of the printing press in the global Iberian Monarchy of the Union of Crowns (1581-1640), when the Portuguese empire was annexed to Spain’s. I argue that the book printer Pedro Craesbeeck and the authors and editors who published works treating America, Africa, and Asia at his Lisbon house used the printing press to attempt to alter the Iberian Monarchy’s commercial and political composition. Pedro Craesbeeck reconfigured the printing industry of Iberian Europe by building a global publishing hub in Lisbon that attracted editorial projects from all over the monarchy while drawing business away from competitors in cities like Madrid, Antwerp, and Seville. Writers and publishers symbolically rearranged the two Iberian empires’ lines of administration, tying Spanish America to Lisbon and Portuguese Asia to Madrid through a variety of textual and material operations. These agents of the Iberian book trade wielded the printing press as a mechanism to ‘re-compose’ the global monarchy they inhabited, exploiting the flexibility of a multi-territorial, multi-jurisdictional state while working within and around the limitations imposed by the institutions of Church and Crown. Pedro Craesbeeck’s press gives us stories of global linkages and disconnections forged in productive tension. This thesis makes a crucial contribution to studies of early modern globalization, which have tended to focus on tracking connections and circulations rather than dynamics of reconfiguration and redistribution. The dissertation also problematizes longstanding views of the printing press as a top-down tool of the Habsburg monarchs by showing that this technology enabled subjects to participate in the monarchy’s construction according to their individual designs. The dissertation makes these claims by closely analyzing the textual and material contents of printed histories, hagiographies, treatises, reports, and poetry in Spanish and Portuguese alongside archival documentation in those languages and Latin, as well as large sets of bibliographical data. Among the canonical works that occupy a prominent place in the dissertation are Mateo Alemán’s Segunda parte de la vida de Guzmán de Alfarache, Inca Garcilaso de la Vega’s La Florida del Inca and Comentarios reales, Luís de Camões’s Os lusíadas, Fernão Mendes Pinto’s Peregrinaçam, and Diogo do Couto’s Décadas da Ásia. I also bring to light a range of little-known works: a hagiography of an ascetic in New Spain, a treatise on the corruption of the Caribbean pearl trade, and a discourse on the short-lived Portuguese takeover of Pegu (current-day Bago, Myanmar), to name a few. By building a corpus of study out of Pedro Craesbeeck’s press, I put into dialogue texts rarely read together due to linguistic and national disciplinary divides. The categories of Spanish, Portuguese, peninsular, and colonial literature, history, and culture dissolve, giving way to a global Iberian perspective.

Made available in DSpace on 2017-03-14T14:10:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-07-31. Added 1 bitstream(s) on 2017-03-14T14:42:44Z : No. of bitstreams: 1 000874660.pdf: 1969189 bytes, checksum: 5bdc581e4bd9de3fcf1b285eb40d888b (MD5) / O objetivo do estudo foi avaliar a influência da inclinação das cúspides, do tipo de retenção e do envelhecimento mecânico na resistência à fratura de coroas metalocerâmicas implanto-suportadas. Para o ensaio estático utilizou-se seis grupos (n=10): coroas cimentadas com cúspide de inclinação padrão (CIP) de 33º ou cúspides de inclinação reduzida (CIR) de 20°, parafusadas com o orifício de acesso ao parafuso (OAP) não-restaurado com CIP ou CIR e parafusadas com OAP restaurado com CIP ou CIR. Para o efeito do envelhecimento, 4 grupos foram utilizados (n=20): cimentadas com CIP ou CIR; e parafusadas com OAP não-restaurado com CIP ou CIR, em que 50 % das amostras de cada grupo foram cicladas mecanicamente previamente ao ensaio estático. Coroas de um segundo molar inferior foram confeccionadas sobre análogos de implante hexágono externo 5.0 (Biomet 3i, West Palm Beach, FL). O ensaio estático foi realizado aplicando-se força até a fratura da porcelana e para o efeito do envelhecimento, a ciclagem foi realizada (1 x 106; 125 N; 10Hz) antes do ensaio de resistência máxima à fratura. Após análise estatística observou-se que as médias de resistência à fratura apresentaram efeito significativo para Forma de Retenção (FR) e Inclinação de cúspide (IC) (p<0,01). Para FR apenas as coroas parafusadas não apresentaram diferenças estatísticas entre si (p>0,05), porém ambas apresentaram valores estatisticamente menores do que as cimentadas. Para IC, CIP apresentaram menores valores de resistência à fratura. Após o envelhecimento mecânico foi observado efeito significativo somente para os fatores isolados Forma de Retenção e Inclinação de cúspide (p<0,01), com melhores resultados para coroas cimentadas e CIR, respectivamente. O fator Envelhecimento Mecânico (p=0,659) não apresentou efeito significativo. Diante dos resultados, conclui-se que isoladamente... (Resumo completo, clicar acesso eletrônica abaixo) / The aim of this study was evaluate the influence of cusp inclination, type of retention and mechanical aging on fracture strength of implant-supported metal-ceramic (MC) single crowns. To static test, six groups were used (n=10): cemented crowns with 33° standard cusp inclination (SCI) or with 20° reduced cusp inclination (RCI), screwed crowns with screw access hole (SAH) not restored with SCI or RCI and screwed crowns with SAH restored with SCI or RCI. To test aging effect, 4 groups were used (n=20): cemented with SCI or RCI; and screw-retained with SAH not restored with SCI or RCI, in which 50% of specimens of each group were submitted to mechanical aging previously to static test. Crowns of a lower second molar were made on the analog implant external hexagon 5.0 (Biomet 3i, West Palm Beach, FL). The cycling (1.106; 125N; 10Hz) will be performed before the fracture resistance test. The static test was performed in a universal testing machine EMIC DL2000, with load application until porcelain failure. After statistical analysis it was observed that the mean fracture resistance of porcelain showed significant effect (p<0.01), to type of retention (TR) and cusp inclination (CI), respectively. To TR, screwed crowns did not show statistical differences (p>0.05), however, both two showed statistically lower values than cemented. To CI, crowns with SCI showed lower values of fracture resistance. After mechanical aging, TR and CI showed significant effect (p<0.01), with better results to cemented crowns and RCI, respectively. The factor mechanical aging did not show significant effect (p=0.659). According to these results, it was concluded that alone, type of retention and the cusp inclination showed influence on fracture resistance of MC crowns, being cemented crowns and reduced cusps mechanically more resistant against a static and cyclic load. The mechanical aging had no significant... (Complete abstract electronic access below)