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Sentences for "copings "
" To our left the glacier was greatly torn, exposing fine vertical sections, deep blue pits and chasms, which[305] were bottomless to vision; and ledges, from whose copings hung vaster stalactites than those observed below.
The partially stabilized ZrO 2 has a fracture toughness twice that of A 2 O 3 [ 16 ] suggesting that ZrO 2 based copings could become a major competitor to Procera in the future.
Because of the above considerations, the objectives of this study was to determine in vitro whether Denzir copings cemented with zinc phosphate cement to metal dies could provide as good retention strength as Procera crowns cemented to similar metal dies.
Ceramic copings Twenty-four Denzir and twelve Procera copings were ordered from Denzir and Procera certified laboratories.
All ceramic copings were made 0.
When the copings arrived from the laboratories, all 36 copings were checked regarding their fit.
Sandblasting Twelve of the Denzir copings were sandblasted on the inner surfaces with A1 2 O 3 (particle size = 50 µm) using an air pressure of 2 bars (200 kPa).
Fifteen minutes after the initiation of the cementation process the cemented copings with the steel dies and washers were transferred to distilled water or artificial saliva and then stored in an oven at 37°C.
Ceramic copings and effect of sandblasting The surface roughness values of the insides of the different coping groups are shown in Table 1.
There was no difference between the two main materials or whether the Denzir copings had been sandblasted or not (Table 3).
Of the Procera copings, two copings fractured during testing after 14 days of storage and one coping fractured after one year.
However, careful inspection with transilluminating light revealed that one of the Denzir copings tested after 1 year had a crack that extended from the cervical region to the occlusal region.
The low value of the sandblasted Denzir copings suggest that the machining process generated a surface roughness that was at least as rough as a machined and sandblasted Denzir surface.
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