Effect of the number of abutments on biomechanics of Branemark prosthesis with straight and tilted distal implants

OBJECTIVE: This study aimed to evaluate the bending moments, and compressive and tensile forces in implant-supported prostheses with three, four or five abutments. MATERIAL AND METHODS: Ten Pd-Ag frameworks were tested over two master models with: 1) parallel vertical implants, and 2) tilted distal implants. Strain gauges were fixed on the abutments of each master model to measure the deformation when a static load of 50 N was applied on the cantilever (15 mm). The deformation values were measured when the metallic frameworks were tested over three, four or five abutments, and transformed into force and bending moment values. Data were analyzed by ANOVA and Tukey's test for multiple comparisons at 5% level of significance. RESULTS: Abutment #1 (adjacent to the cantilever) had the highest values of force and sagittal bending moment for all tests with three, four or five abutments. Independently from the number of abutments, axial force in abutment #1 was higher in the vertical model than in the tilted model. Total moment was higher with three abutments than with four or five abutments. Independently from the inclination of implants, the mean force with four or five abutments was lower than that with three abutments. CONCLUSION: The results suggest that in the set-ups with four or five abutments tilted distal implants reduced axial force and did not increase bending moments

For?a e momento fletor em pilares de pr?tese tipo protocolo Branemark em fun??o da inclina??o dos implantes distais e do n?mero de pilares

Made available in DSpace on 2015-04-14T13:29:49Z (GMT). No. of bitstreams: 1 347078.pdf: 3100717 bytes, checksum: 8eb98e89cc77c38eba3eacc34452c1bb (MD5) Previous issue date: 2006-04-17Este estudo in vitro teve por objetivo analisar as for?as de tra??o, compress?o e momentos fletores exercidos nos pilares de sustenta??o de pr?teses tipo protocolo Br?nemark em fun??o da varia??o do n?mero de pilares (tr?s, quatro ou cinco) e da inclina??o dos implantes distais (retos ou inclinados). Foram fabricadas dez barras met?licas em liga de Prata-Pal?dio, as quais simularam uma pr?tese fixa tipo Protocolo Br?nemark sobre dois modelos-mestre: um modelo com todos os implantes retos e paralelos entre si (n=5 barras) e outro com os dois implantes distais inclinados (n=5 barras). Extens?metros foram colados nos pilares prot?ticos de cada modelo-mestre para medir a deforma??o quando da aplica??o de uma carga est?tica de 50 N no extremo livre (15 mm) de cada barra met?lica. Os valores de deforma??o foram medidos quando as barras foram testadas sobre tr?s, quatro e cinco pilares dos modelos reto e inclinado. Os valores de deforma??o dos pilares foram convertidos em for?a e momento fletor atrav?s de c?lculos matem?ticos e analisados por ANOVA para delineamento em blocos casualizados, complementada pelo Teste de Compara??es M?ltiplas de Tukey, ao n?vel de signific?ncia de 5%. O pilar 1 (adjacente ao cantilever sob carga) apresentou for?a e momento ?ntero-posterior significativamente maiores do que os demais pilares em todas as configura??es. Para for?a no pilar 1, independentemente do n?mero de pilares, o modelo reto apresentou maior for?a do que no modelo inclinado. O momento geral foi maior com tr?s pilares em rela??o ?s configura??es com quatro ou cinco pilares.Nas configura??es com quatro e cinco pilares, independente da inclina??o dos implantes, a m?dia de for?a foi menor do que na configura??o de tr?s pilares.Os resultados sugerem que a inclina??o dos implantes posteriores permite uma melhor distribui??o de for?as e momentos fletores em pilares para pr?teses tipo Protocolo Br?nemark nas configura??es com quatro e cinco pilares em rela??o ? configura??o com tr?s pilares

Effect of the number of abutments on biomechanics of Branemark prosthesis with straight and tilted distal implants

OBJECTIVE: This study aimed to evaluate the bending moments, and compressive and tensile forces in implant-supported prostheses with three, four or five abutments. MATERIAL AND METHODS: Ten Pd-Ag frameworks were tested over two master models with: 1) parallel vertical implants, and 2) tilted distal implants. Strain gauges were fixed on the abutments of each master model to measure the deformation when a static load of 50 N was applied on the cantilever (15 mm). The deformation values were measured when the metallic frameworks were tested over three, four or five abutments, and transformed into force and bending moment values. Data were analyzed by ANOVA and Tukey's test for multiple comparisons at 5% level of significance. RESULTS: Abutment #1 (adjacent to the cantilever) had the highest values of force and sagittal bending moment for all tests with three, four or five abutments. Independently from the number of abutments, axial force in abutment #1 was higher in the vertical model than in the tilted model. Total moment was higher with three abutments than with four or five abutments. Independently from the inclination of implants, the mean force with four or five abutments was lower than that with three abutments. CONCLUSION: The results suggest that in the set-ups with four or five abutments tilted distal implants reduced axial force and did not increase bending moments

Otimização de Estética e Função em Próteses Implantossuportadas através da Personalização de Pilares - Relato de Caso Clínico

Os pilares personalizados, preparados individualmente para cada situação, vêm sendo cada vez mais utilizados pelos odontólogos devido ao fato de minimizarem problemas de angulação e alinhamento de implantes dando à coroa um perfil de emergência mais natural. O presente estudo relata um caso clínico onde foram utilizados pilares protéticos tipo UCLA personalizados para otimizar função e estética numa reabilitação protética

Otimização de estética e função em próteses implantossuportadas através da personalização de pilares : relato de caso clínico

Customized abutments, individually made for each situation, have been used by den- tists because they can resolve angulation and alignment problems of implants and can provide a more natural emergence profile for the crown. The present study describes a case report using UCLA customized abutments to enhance function and esthetics in a prosthetic rehabilitation.Os pilares personalizados, preparados individualmente para cada situação, vêm sendo cada vez mais utilizados pelos odontólogos devido ao fato de minimizarem problemas de angulação e alinhamento de implantes dando à coroa um perfil de emergência mais natural. O presente estudo relata um caso clínico onde foram utilizados pilares protéticos tipo UCLA personalizados para otimizar função e estética numa reabilitação protética