Page 8 - Dental Technology 12-3

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08 prosthetic section DENTAL TECHNOLOGY, JULY-SEPTEMBER 2022

ZIRCONIA FULL ARCH OVERSTRUCTURE ON

IMPLANT SUPPORTED TITANIUM BAR

NONDAS VLACHOPOULOS

The need to make full arch implant restora- The patient presented with a complete the position of the teeth during the prosthe-
tion that is durable and highly aesthetic denture in the Maxilla (Figure 1). Implants sis fabrication. Their simultaneous use
leads the laboratory to use specialized tech- were surgically positioned for the patient ensures maintenance of the correct position
niques to process modern aesthetic materi- according to plan and digital scanning ele- and length of the incisal edge of the six
als such as zirconia. This ensures fracture ments were positioned for impression making anterior teeth. This was of major impor-
resistance much like that of metal-ceramic. procedures (Figures 2 & 3). Production of tance as the patient expressed the desire to
At times in such extensive large-scale zirco- this case was done entirely digitally. have his anterior teeth in the same position
nia restorations, cracks can occur due to the A temporary PMMA transitional restora- and of the same length as the interim
nature of the material, the excessively large tion was initially digitally constructed to restoration (Figure 8). The oral scanner
dimensions of the construction, the difficul- verify function and aesthetics, as well as STL files was loaded to laboratory design
ty of protocol construction as well as very evaluate and correct phonetics (Figure 4). software and then the digital design of the
often human mistakes. The desire to avoid Additional information such as the bar was started (Figures 9-15).
these problems has led to the technique color of the soft tissues was provided Our goal was to design a bar that had
that is described in this article, where the (Figure 5). strength and also space allowances for the
zirconia superstructure was reinforced by With the help of laboratory silicone (90 opposing teeth. During the second stage of
the addition of a titanium bar inside the shore hardness) a buccal and a palatal sili- zirconia production, there should be suffi-
structure. cone index was made in order to preserve cient thickness of material for ideal durabil-

FIG 1 FIG 2 FIG 3

FIG 4 FIG 5 FIG 6

FIG 7 FIG 8