Implant abutment screw rotations and preloads for four different screw materials and surfaces

Martin, Will C.; Woody, Ronald D.; Miller, Bess; Miller, Amp W.

doi:10.1067/mpr.2001.116230

Cited by 151 publications

(149 citation statements)

References 10 publications

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“…[14][15][16][17] The stability of the external implant-abutment connection was subsequently improved by altering the screw alloys and their surfaces and applying proper torque values to establish higher initial preloads. 3,[18][19][20][21] …”

Section: ) Conclusion: the Results Show That Abutment Screw Loosenimentioning

confidence: 99%

Abutment screw loosening in single-implant restorations: A systematic review

Theoharidou

Petridis²,

Tzannas³

et al. 2009

The Journal of Prosthetic Dentistry

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3). Conclusion: The results show that abutment screw loosening is a rare event in singleimplant restorations regardless of the geometry of implant-abutment connection, provided that proper antirotational features and torque are employed. INT J ORAL MAXILLOFAC IMPLANTS 2008;23:681-690Key words: implant complications, implant geometry, meta-analysis, screw loosening, single implants T he stability of the connection between different implant parts is important for the overall success of the reconstruction. This is especially true for singletooth restorations, where a strong interlock between the abutment and implant is necessary. Various mechanisms have been proposed to connect the dental implant abutment to the implant body. Different systems vary in connection geometry, materials, and overall screw mechanics. The implant-abutment connection stability is also influenced by factors such as component fit, machining accuracy, saliva contamination, and screw preload. [1][2][3][4][5][6][7][8] Most in vitro studies, [9][10][11][12] with the exception of one, 13 have demonstrated that internal connections are more mechanically stable than external flat (hex-type) connections. Loosening of abutment screws, particularly with the "classic" external-hex implant systems, has been a well-known technical problem, occurring mainly during the first 2 years after delivery of the crown. [14][15][16][17] The stability of the external implant-abutment connection was subsequently improved by altering the screw alloys and their surfaces and applying proper torque values to establish higher initial preloads. 3,[18][19][20][21]

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Section: ) Conclusion: the Results Show That Abutment Screw Loosenimentioning

confidence: 99%

Abutment screw loosening in single-implant restorations: A systematic review

Theoharidou

Petridis²,

Tzannas³

et al. 2009

The Journal of Prosthetic Dentistry

View full text Add to dashboard Cite

show abstract

“…Given this situation, in single rehabilitations, the possibility of loosening the prosthesis retaining screw is higher when compared with splinted prostheses (1). The loosening may be caused by loss or reduction of retaining screw torque, which is produced by several factors, including improper torque, lack of adaptation, large rotational freedom, failure in the screws when re-tightened, which favors wear and decreases friction between the components, making difficult the access in posterior mouth regions for screw tightening and different torques produced by mechanical devices (2)(3)(4).…”

Section: Introductionmentioning

confidence: 99%

Effect of Mechanical Cycling on Screw Torque in External Hexagon Implants with and without Platform Switching

et al. 2015

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This in vitro study evaluated the effect of mechanical cycling on the torque of retaining screw in external hexagon implants with platform switching (PS), regular platform (RP) and wide platform (WP). A total of 30 specimens were equally divided into 3 groups: PS, PR and WP. Each specimen was prepared with implants: 3.75 x 10 mm for RP group and 5.0x10 mm for PS and WP groups and its respective abutment with 32 Ncm torque. All groups were subjected to 10 6 cycles with 100 N (corresponding to about 40 months of chewing). The results were obtained with the reverse torque of each specimen and data were evaluated using ANOVA and Tukey test (p<0.05). The PS group showed statistically significant difference in screw removal torque (30.06±5.42) compared with RP (23.75±2.76) and WP (21.32±3.53) (p<0.05) groups; the RP and WP groups showed no statistically significant difference between them. It was concluded that the PS group showed higher reverse torque value, suggesting lower susceptibility of the abutment screw loosening.

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“…Kallus e Bessing (1994) JANSON, 2002;KARL et al, 2006). Dentre estas inúmeras maneiras, a avaliação através da rotação dos parafusos em graus parece também contribuir para um melhor entendimento do comportamento mecânico desse elemento tão importante na prótese sobre implante (MARTIN et al, 2001 ,1997;SCHIEFFLEGER et al, 1985). As fundições em monobloco têm sido usadas rotineiramente por alguns autores (RIEDY; LANG; LANG, 1997;SCHIEFFLEGER et al, 1985;WASKEWICZ;OSTROWSKI;PARKS, 1994), que também sugerem o seccionamento das peças em situações no qual uma análise intra-oral revela uma adaptação imprecisa.…”

Section: Preparo Para Solda Convencionalunclassified

“…Segundo Kano et al (1995), Isa e Hobkirk (1996) Uma provável hipótese para essa ocorrência seria que uma maior ou uma permanente deformação dos parafusos ocorressem nesse grupo, quando o parafuso giraria mais para se adaptar às condições da união parafusada, mostrando uma maior deformação plástica dos parafusos para o completo assentamento, Para compreendermos melhor nossos achados traçamos um paralelo com os trabalhos de Dixon et al (1995), Martin et al (2001) Outros fatores inter-relacionados podem interferir de forma mais crítica na estabilidade de uma união parafusada e, de maneira geral, como já referidos anteriormente, podemos citar os efeitos de acomodação das superfícies contactantes (embedment relaxation), a pré-carga e a geometria tanto dos parafusos como dos componentes que se fazem presentes na área de união (JÖRNEUS;…”

Section: Preparo Para Solda Convencionalunclassified

“…Assim, pode-se inferir ainda que a acomodação das superfícies contactantes dependa basicamente da rugosidade superficial dos componentes envolvidos (CARR; BRUNSKI; HURLEY, 1996) e as propriedades dos materiais que os constituem determinem claramente essa condição (JÖRNEUS; JEMT; CARLSSON, 1992;BURGUETE et al, 1994;MARTIN et al, 2001), assim como o desenho da peça protética e etapas de confecção e soldagem das peças (CLELLAND; CARR; GILAT, 1996;MENDES, 2003).…”

Section: Preparo Para Solda Convencionalunclassified

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Análise comparativa do grau de rotação de parafusos para sistema UCLA em estruturas fundidas em monobloco, soldadas com solda TIG e solda convencional

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Implant abutment screw rotations and preloads for four different screw materials and surfaces

Cited by 151 publications

References 10 publications

Abutment screw loosening in single-implant restorations: A systematic review

Abutment screw loosening in single-implant restorations: A systematic review

Effect of Mechanical Cycling on Screw Torque in External Hexagon Implants with and without Platform Switching

Análise comparativa do grau de rotação de parafusos para sistema UCLA em estruturas fundidas em monobloco, soldadas com solda TIG e solda convencional

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