Abstract
The precision of fit at the implant-abutment connection is an important criterion for the clinical success of restorations and implants. Several factors are involved among which are the abutment materials and manufacturing techniques. The aim of this study was to investigate the effect of two materials and methods of manufacturing implant abutments, milled titanium versus laser sintered Co-Cr, on the marginal misfit at the implant-abutment interface. Scanning electron microscopes (SEM) were used to geometrically measure the marginal vertical discrepancy of a total of 80 specimens, classified into eight categories, according to the implant system and abutment. The data were statistically analyzed by Student’s paired t test, one-way and two-way ANOVA with the Bonferroni-Holm correction at the significance level of p = 0.05. Milled titanium abutments demonstrated the lowest misfit values in the implant systems analyzed. The marginal fit of all the groups was within the clinically acceptable range for implant prostheses.
Highlights
Dental implant rehabilitation, with over 40 years of scientific evidence, is a restorative alternative to the replacement of missing teeth widely used in clinical practice, due to the phycological and functional benefits of the patients, with high success and survival rates [1,2,3]
The purpose of the present study was to evaluate the effect of two materials and methods of manufacturing implant abutments, computer-aided design- computer-aided manufacturing (CAD-CAM) milled Ti and Co-Cr 3D laser sintered, on the marginal accuracy at the implant-abutment interface (IAI) on internal connection in four implant systems
The dies were randomly assigned to one of the eight groups (n = 10 each according to the results of power analysis) and the groups were categorized according to the implant system and the abutment material and manufacture technique: group AM, group AS, group GM, group GS, group MM, group MS, group PM and group PS (Table 1)
Summary
With over 40 years of scientific evidence, is a restorative alternative to the replacement of missing teeth widely used in clinical practice, due to the phycological and functional benefits of the patients, with high success and survival rates [1,2,3]. To provide a passive fit between the implant and its abutment, vertical misfit has been reported as an important requisite to ensure the aesthetic and functional long-term treatment success [4,5]. There is no consensus in the scientific literature about the clinically acceptable marginal gap. The average micro gap of the implant-abutment interface has been reported to be from 1 to 49 μm [10,11], while the average size of bacteria is 0.2–1.5 μm in width and 1–10 μm in length depending on the shape [12,13]. Jemt [14], who defined passive fit as the level of misfit without long-term clinical complications, considered that acceptable values of marginal misfit were within the 150 μm range
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