Aim: Temporary rehabilitation on implants, whether fixed or removable, requires resin thickness that makes it aesthetic, durable and comfortable for the patient. However, these requirements are not always clinically attainable mainly due to the limited dimensions of the final structure. For this reason, it is desirable to create a framework with, on one hand constrained dimensions and, on the other hand, sufficient resistance to cyclic stresses. In addition, other factors must be taken into account, such as the economic aspect and the timing required to finalize the rehabilitation, to name some. One possibile solution to these requests was found to be the use of intraoral welding technique. The aim of this in vitro pilot study is to establish the minimum thickness of resin required to mask the metal framework used into intraoral welding technique. Methods: Three specimens were produced with three titanium bars of grade two (2 mm diameter) (Dentsply Implants Manufacturing; Germany): the first remained untreated, the second was sandblasted, the third was opacified; three specimens of dimensions of 12x6 mm were prepared of PMMA (BreCam Multicom, Bredent GmbH & Co.) of A3 color that differ in thickness 1, 2, 3 mm; three specimens were prepared of pink resin (Palapress, Kulzer dental) of the same size as the previous ones. These were then superimposed on each other and images of the different combinations were acquired with a spectrophotometer (Spectroshade Micro, MHT) evaluating the color difference (ΔE) at three points between the different specimens and their combinations on the basis of the application of the CIEL*a*b color space system. ANOVA test were used for statistical analysis. Results: The study shows that at least 3 mm of A3 color resin is required to mask the untreated or sandblasted metal framework 0<1). None of examined pink resin’s thicknesses allowed to mask the three type of metal framework (ΔE>1). The two factors “thickness” and “metal condition” examined seem to influence the outcome ΔE significantly (p value <0.05). Conclusion: The results obtained in this in vitro study showed that was possible to mask the opaque titanium framework with a combination of at least 3 mm of pink resin and 3 mm of A3 color resin. A clinical alternative to mask the titanium framework could be the palatally/lingually placement of welded bar, compatibly with the clearance available for prosthetic rehabilitation.

Spectrophotometric analysis of immediate implant-supported rehabilitations: in vitro study

F. Pegoraro;L. Bevilacqua
;
G. Turco;D. Angerame;M. Maglione
2019-01-01

Abstract

Aim: Temporary rehabilitation on implants, whether fixed or removable, requires resin thickness that makes it aesthetic, durable and comfortable for the patient. However, these requirements are not always clinically attainable mainly due to the limited dimensions of the final structure. For this reason, it is desirable to create a framework with, on one hand constrained dimensions and, on the other hand, sufficient resistance to cyclic stresses. In addition, other factors must be taken into account, such as the economic aspect and the timing required to finalize the rehabilitation, to name some. One possibile solution to these requests was found to be the use of intraoral welding technique. The aim of this in vitro pilot study is to establish the minimum thickness of resin required to mask the metal framework used into intraoral welding technique. Methods: Three specimens were produced with three titanium bars of grade two (2 mm diameter) (Dentsply Implants Manufacturing; Germany): the first remained untreated, the second was sandblasted, the third was opacified; three specimens of dimensions of 12x6 mm were prepared of PMMA (BreCam Multicom, Bredent GmbH & Co.) of A3 color that differ in thickness 1, 2, 3 mm; three specimens were prepared of pink resin (Palapress, Kulzer dental) of the same size as the previous ones. These were then superimposed on each other and images of the different combinations were acquired with a spectrophotometer (Spectroshade Micro, MHT) evaluating the color difference (ΔE) at three points between the different specimens and their combinations on the basis of the application of the CIEL*a*b color space system. ANOVA test were used for statistical analysis. Results: The study shows that at least 3 mm of A3 color resin is required to mask the untreated or sandblasted metal framework 0<1). None of examined pink resin’s thicknesses allowed to mask the three type of metal framework (ΔE>1). The two factors “thickness” and “metal condition” examined seem to influence the outcome ΔE significantly (p value <0.05). Conclusion: The results obtained in this in vitro study showed that was possible to mask the opaque titanium framework with a combination of at least 3 mm of pink resin and 3 mm of A3 color resin. A clinical alternative to mask the titanium framework could be the palatally/lingually placement of welded bar, compatibly with the clearance available for prosthetic rehabilitation.
2019
https://www.journalofosseointegration.eu/index.php/jo/article/view/300
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2959278
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