The effect of commercially pure titanium and alternative dental alloys on the marginal fit of one-piece cast implant frameworks

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Journal of Dentistry
Volume 35, Issue 10, October 2007, Pages 800-805

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The effect of commercially pure titanium and alternative dental alloys on the marginal fit of one-piece cast implant frameworks

Örica Miranda de Torres1,1, a, Renata Cristina Silveira Rodrigues 2, a, Maria da Gloria Chiarello de Mattos 2, a, and Ricardo Faria Ribeiro, a,
a University of SÑo Paulo, Dental School of RibeirÑo Preto, Department of Dental Materials and Prosthodontics, RibeirÑo Preto, SP, Brazil

Received 12 December 2006; revised 17 July 2007; accepted 18 July 2007. Available online 6 September 2007.

Contact: rribeiro@forp.usp.br

Abstract
Objectives
The purpose of this study was to measure and compare the passive fit and vertical fit of one-piece cast frameworks fabricated with three different materials: commercially pure titanium (CP Ti), cobaltÒchromium alloy (CoÒCr) and nickelÒchromiumÒtitanium alloy (NiÒCrÒTi).

Methods
Fifteen frameworks simulating bars for fixed prosthesis in a model with five implants were fabricated and arranged into three different groups according to the material used. The fit of the framework abutment interface was measured using an optical microscope, when only one screw was manually tightened at a terminal abutment (passive fit) or when all framework screws were tightened to 10 N cm torque (vertical fit). Data were statistically analyzed using KruskalÒWallis and MannÒWhitney tests (α = 0.05).

Results
Mean and standard deviation values of passive fit and vertical fit are presented, respectively: CP Ti [88 (74) &#956;m and 22 (9) &#956;m], CoÒCr [229 (184) &#956;m and 66 (35) &#956;m], NiÒCrÒTi [200 (175) &#956;m and 32 (24) &#956;m]. There were no significant differences between passive fit of CoÒCr and NiÒCrÒTi frameworks (p = 0.313), but both alloys were statistically different from CP Ti (p < 0.001 and 0.035, respectively), which showed the best results. As for vertical fit, CP Ti and NiÒCrÒTi alloy were statistically similar (p = 0.162) and they presented a better vertical fit than CoÒCr alloy (p < 0.001).

Conclusions
Within the limitations of this study, it was possible to conclude that one-piece cast frameworks resulted in unacceptable passive fit and vertical fit, no matter which material had been used to fabricate them. However, the best results were obtained using CP Ti followed by NiÒCrÒTi and CoÒCr alloys, respectively.

Corresponding author at: Department of Dental Materials and Prosthodontics, Dental School of RibeirÑo Preto, University of SÑo Paulo, Av. do Caf», s/nÒMonte Alegre, RibeirÑo Preto, SP CEP: 14040-904, Brazil. Tel.: +55 16 3602 4046/3983; fax: +55 16 3633 0999.
1 Present address: Rua SÑo Jos», 1153, Apto. 92, Centro. RibeirÑo Preto, SP CEP: 14010-160, Brazil.
2 Present address: Av. do Caf», s/nÒMonte Alegre, RibeirÑo Preto, SP CEP: 14040-904, Brazil.

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