Research Article Effect of Abutment Geometry and Luting Agents on the Vertical Marginal Discrepancy of Cast Copings on Implant Abutments: An In Vitro Study
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2021Autor(es)
Rosas Diaz, Jose 1,2
Mayta-Tovalino, Frank 3
Malpartida-Carrillo, Violeta 2
Munive Degregori, Arnaldo 4
Mendoza, Roman 5
Guerrero 6, Maria-Eugenia
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Implant-supported restorations have shown remarkable
progress in recent years and have demonstrated high sur vival rates of up to 95% with well-documented functional
and esthetic results [1, 2]. Classically, implant-supported
restorations can be cement-retained or screw-retained. Al though both methods have potential uses, the ideal option
has yet to be established, and the selection depends on
retrievability and esthetic factors [3].
Depending on the retention method, the success of the
implant rehabilitation is not free of complications and re quires dynamic equilibrium between implant osseointe gration and technical and biological factors. However, based
on current findings, the main complications of dental im plants are produced by biological factors [4, 5]. Furthermore,
Hindawi
International Journal of Dentistry
Volume 2021, Article ID 9950972, 7 pages
https://doi.org/10.1155/2021/9950972according to recent studies [6], the most frequent compli cations are technical and biological, being significantly
higher in cement-retained restorations because of disad vantages related to vertical marginal discrepancies (VMD)
and excess cement extrusion on the peri-implant tissues. In
addition, in most cases, residual excess cement may promote
bleeding, local inflammation, and suppuration [7, 8].
Vertical marginal discrepancy is a primordial require ment for long-term success. One author recommended [9] a
VMD of less than 120 μm after coping cementation, as
originally suggested for fixed prostheses. However, other in
vitro studies [10] reported mean VMD values of 63.6 μm in
noncemented cast copings and 116.1 μm after cast coping
cementation [11]. Although there is no consensus on an
acceptable maximum VMD in implant frameworks, mean
values below 30 μm have been difficult to achieve clinically
using conventional ceramic crowns [12]. Abbo et al. [13]
reported that different factors can affect implant-supported
restorations. +e luting agent thickness exposed to the oral
cavity can be determined by the width, height, taper of the
abutments, and type of luting agents. In the implant context,
previous studies have evaluated the VMD using implant
abutments regarding cast coping fabrication [10, 11], ad hesive crown cementation [9], and crown material fabri cation [14]. However, to the authors’ knowledge, little
evidence is available on the effect of abutment geometry and
luting agents on the VMD of copings cemented over implant
abutments.
Considering that control of the variables that influence
the VMD and the cement line is essential, the objective of
this research was to evaluate the effect of abutment geometry
and luting agents on the VMD of cast copings on implant
abutments.
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