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Comparative evaluation of bonding strength of computer aided machined ceramic, pressable ceramic, and milled metal implant abutment copings and effect of surface conditioning on bonding strength: An in vitro study

View Article: PubMed Central - PubMed

ABSTRACT

Background/purpose:: The aim of this study was to compare the shear bond strength of computer aided design/computer aided machined ceramic (CAD/CAM), pressable ceramic, and milled metal implant copings on abutment and the effect of surface conditioning on bonding strength.

Materials and methods:: A total of 90 test samples were fabricated on three titanium abutments. Among 90 test samples, 30 copings were fabricated by CAD/CAM, 30 by pressable, and 30 by milling of titanium metal. These 30 test samples in each group were further subdivided equally for surface treatment. Fifteen out of 30 test samples in each group were surface conditioned with airborne particle abrasion. All the 90 test samples were luted on abutment with glass ionomer cement. Bonding strength was evaluated for all the samples using universal testing machine at a crosshead speed of 5 mm/min. The results obtained were compared and evaluated using one-way ANOVA with post-hoc and unpaired t-test at a significance level of 0.05.

Results:: The mean difference for CAD/CAM surface conditioned subgroup was 1.28 ± 0.12, for nonconditioned subgroup was 1.20 ± 0.11. The mean difference for pressable surface conditioned subgroup was 1.18 ± 0.04, and for nonconditioned subgroup was 0.75 ± 0.28. The mean difference for milled metal surface conditioned subgroup was 2.57 ± 0.58, and for nonconditioned subgroup was 1.49 ± 0.15.

Conclusions:: On comparison of bonding strength, milled metal copings had an edge over the other two materials, and surface conditioning increased the bond strength.

No MeSH data available.


(a-c) Abutment copings made of computer aided design/computer aided machined (left), pressable ceramic (middle), and milled metal (right)
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Figure 1: (a-c) Abutment copings made of computer aided design/computer aided machined (left), pressable ceramic (middle), and milled metal (right)

Mentions: For Group A, 30 CAD/CAM zirconia copings were fabricated on one implant abutment [Figure 1a] using cercon CAD/CAM system (Dentsply, Germany). Scan spray containing silver particles was sprinkled on abutment. Optical scanning was done with cercon eye. Once the scanning was completed with cercon eye, cement gap, wall thickness, and occlusal geometry were adjusted for the coping with the help of cercon art program. A luting gap of 30 μm and wall thickness of 0.8 mm were chosen for the coping fabrication. Presintered zirconia blank of 38 size was inserted in cercon brain to complete the milling. After milling was completed, the frameworks of the coping were separated from the blank with the help of micromotor and sintered in furnace, according to manufacturer's instructions. Dimensions of CAD/CAM coping was measured with digital caliper (Shenzhen YKS Technology Ltd., China).


Comparative evaluation of bonding strength of computer aided machined ceramic, pressable ceramic, and milled metal implant abutment copings and effect of surface conditioning on bonding strength: An in vitro study
(a-c) Abutment copings made of computer aided design/computer aided machined (left), pressable ceramic (middle), and milled metal (right)
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4837770&req=5

Figure 1: (a-c) Abutment copings made of computer aided design/computer aided machined (left), pressable ceramic (middle), and milled metal (right)
Mentions: For Group A, 30 CAD/CAM zirconia copings were fabricated on one implant abutment [Figure 1a] using cercon CAD/CAM system (Dentsply, Germany). Scan spray containing silver particles was sprinkled on abutment. Optical scanning was done with cercon eye. Once the scanning was completed with cercon eye, cement gap, wall thickness, and occlusal geometry were adjusted for the coping with the help of cercon art program. A luting gap of 30 μm and wall thickness of 0.8 mm were chosen for the coping fabrication. Presintered zirconia blank of 38 size was inserted in cercon brain to complete the milling. After milling was completed, the frameworks of the coping were separated from the blank with the help of micromotor and sintered in furnace, according to manufacturer's instructions. Dimensions of CAD/CAM coping was measured with digital caliper (Shenzhen YKS Technology Ltd., China).

View Article: PubMed Central - PubMed

ABSTRACT

Background/purpose:: The aim of this study was to compare the shear bond strength of computer aided design/computer aided machined ceramic (CAD/CAM), pressable ceramic, and milled metal implant copings on abutment and the effect of surface conditioning on bonding strength.

Materials and methods:: A total of 90 test samples were fabricated on three titanium abutments. Among 90 test samples, 30 copings were fabricated by CAD/CAM, 30 by pressable, and 30 by milling of titanium metal. These 30 test samples in each group were further subdivided equally for surface treatment. Fifteen out of 30 test samples in each group were surface conditioned with airborne particle abrasion. All the 90 test samples were luted on abutment with glass ionomer cement. Bonding strength was evaluated for all the samples using universal testing machine at a crosshead speed of 5 mm/min. The results obtained were compared and evaluated using one-way ANOVA with post-hoc and unpaired t-test at a significance level of 0.05.

Results:: The mean difference for CAD/CAM surface conditioned subgroup was 1.28 ± 0.12, for nonconditioned subgroup was 1.20 ± 0.11. The mean difference for pressable surface conditioned subgroup was 1.18 ± 0.04, and for nonconditioned subgroup was 0.75 ± 0.28. The mean difference for milled metal surface conditioned subgroup was 2.57 ± 0.58, and for nonconditioned subgroup was 1.49 ± 0.15.

Conclusions:: On comparison of bonding strength, milled metal copings had an edge over the other two materials, and surface conditioning increased the bond strength.

No MeSH data available.