Fixed Restorations
Full Zirconia
Providing both esthetics and function desired by patients. Our full zirconia crowns are partially stabilized with yttrium and enriched with aluminium and is manufactured using a biaxial compression method (same pressure being applied above and below) so the shrinking that occurs in sintering can be checked exactly.
Indications Full-contour zirconia is so versatile, it can be used in almost any situation from singles, bridges with any combination of abutments and pontics, inlay bridges, Maryland type bridges and screw retained implants. Also an esthetic alternative to a PFM with metal occlusion due to limited space.
Contraindications Contraindications include: When esthetic expectations are high and it is important that the restorations match surrounding natural dentition or other existing restorations If bonding is necessary to retain the restoration, bond strength is weaker and less predictable than other ceramics
Cementation Full-contour zirconia may be cemented using a resin reinforced glass ionomer such as Relyx Luting cement. When a greater bond is needed due to the lack of a retentive preparation, use resin cement like Relyx Unicam or Relyx Ultimate. Before cementing all Full-contour zirconia crowns, the interior surface of the crown needs to be cleaned with Ivoclean (Ivoclar Vivadent; Amherst N.Y.). This is critical in assuring maximum bond strength.
Preparation Shoulder preparation not needed. A mild champfer or a feather edge margin is good. 1mm buccal, lingual and occlusal reduction is ideal, but can go to .5mm in some areas, when reduction is limited. Minimum occlusal reduction of 0.5 mm; 1 mm is ideal. Adjustments and polishing: Adjust Full-contour zirconia crowns and bridges using water and air spray to keep the restoration cool and to avoid micro-fractures with a fine grit diamond. If using air only, use the lightest touch possible when making adjustments. A football-shaped bur is the most effective for occlusal and lingual surfaces (on anterior teeth); a tapered bur is the ideal choice for buccal and lingual surfaces. Polish Full-contour zirconia restorations with the porcelain polishing system of your choice.
Tech Notes Solid zirconia requires a cast gold type preparation. If adjustments are needed, use zirconia specific diamonds and rubber wheels polishing with diamond paste.
Codes D2740 Crown – Porcelain/Ceramic Substrate D6245 Pontic Porcelain/Ceramic D6740 Abutment Crown Porcelain/Ceramic
Layered Zirconia
AM Dental provides the highest quality all-ceramic found anywhere. Fabricated using the latest and best CAD/CAM technology. Layered Zirconia is an improved version from the Solid series to help overcome aesthetic weaknesses. Its structure consists of Zirconia ribs inside and covered with a layer of porcelain outside. And that’s why the strength, flexural strength, and load capacity will be weaker than that of the original Zirconia crown. But generally, layered Zirconia can satisfy both the highest esthetics and the durability for all posterior and anterior cases.
Product Information
Indications
Layered zirconia is so versatile, it can be used in almost any situation from singles, bridges with any combination of abutments and pontics, inlay bridges, Maryland type bridges and screw retained implants. Also an esthetic alternative to a PFM with metal occlusion due to limited space.
Contraindications
Contraindications include:
When esthetic expectations are high and it is important that the restorations match surrounding natural dentition or other existing restorations
If bonding is necessary to retain the restoration, bond strength is weaker and less predictable than other ceramics
Cementation
Layered zirconia may be cemented using a resin reinforced glass ionomer such as Relyx Luting cement. When a greater bond is needed due to the lack of a retentive preparation, use resin cement like Relyx Unicam or Relyx Ultimate.
Before cementing all layered zirconia crowns, the interior surface of the crown needs to be cleaned with Ivoclean (Ivoclar Vivadent; Amherst N.Y.). This is critical in assuring maximum bond strength.
Preparation
Shoulder preparation not needed. A mild champfer or a feather edge margin is good. 1mm buccal, lingual and occlusal reduction is ideal, but can go to .5mm in some areas, when reduction is limited.
Minimum occlusal reduction of 0.5 mm; 1 mm is ideal.
Adjustments and polishing: Adjust Full-contour zirconia crowns and bridges using water and air spray to keep the restoration cool and to avoid micro-fractures with a fine grit diamond. If using air only, use the lightest touch possible when making adjustments. A football-shaped bur is the most effective for occlusal and lingual surfaces (on anterior teeth); a tapered bur is the ideal choice for buccal and lingual surfaces.
Layered zirconia restorations with the porcelain polishing system of your choice.
Tech Notes
Layered zirconia requires a cast gold type preparation. If adjustments are needed, use zirconia specific diamonds and rubber wheels polishing with diamond paste.
Codes
D2740 Crown – Porcelain/Ceramic Substrate
D6245 Pontic Porcelain/Ceramic
D6740 Abutment Crown Porcelain/Ceramic
Full Ceramic
The monolithic structure of lithium disilicate gives full ceramic its strength, opalescence and translucency. These monolithic properties result in high flexural strength (360 – 400 MPa), excellent fracture resistance, stunning light-diffusion qualities, and a wide range of practice-building indications.
Product Information
Indications
Full Ceramic is indicated for full anterior or posterior crowns, veneers, inlays, onlays,as well as three-unit bridges having only one pontic with the second bicuspid as the most distal abutment.
Contraindications
Bridges which include molars, Maryland style bridges and bridges which have a short vertical height that does not allow for adequate connector height.
Cementation
Full Ceramic– can be either cemented using a resin reinforced glass ionimer such as Relyx Luting cement. Or bonded using a resin cement, when extra strength is needed due to lack of retention on the prep, use a resin cement such as Relyx Unicem or Relyx Ultimate.
Preparation
Anterior full-coverage crowns require a chamfer or shoulder margin. A circular shoulder is prepared with rounded inner edges or a chamfer at an angle of 10-30°: the width of the shoulder/chamfer is approx. 1 mm. Facial reduction is 1.5 – 2 mm; 1 – 1.5 mm lingual contact clearance. Incisal reduction is 1.5 – 2 mm with rounded internal line angles, and an incisal edge at least 1mm wide to permit optimum milling of the incisal edge during CAD/CAM processing. Posterior full-coverage crown requires a chamfer or shoulder margin. A circular shoulder is prepared with rounded inner edges or a chamfer at an angle of 10-30°: the width of the shoulder/chamfer is approx. 1 mm. Occlusal reduction is 1.5 – 2 mm: axial reduction (buccal, lingual and interproximal) is 1.5 mm with rounded internal line angles.
Tech Notes
If adjustments are needed, use fine diamonds with water and light pressure. Always remove the crown when adjusting or bond/cement crown before adjustments are made.).
Codes
D2740 Crown
D2610 Inlay for 1 surface
D2620 Inlay for 2 surfaces
D2630 Inlay for 3 surfaces
D2962 Labial Veneer
D2783 Crown 3/4 Porcelain Ceramic (does not include veneers)
Full Cast
AM Dental Laboratory uses Argen gold for our full-cast restorations, ensuring high quality and endurable strength for this popular restorative option.
Product Information
Indications
Full-cast gold crowns are indicated for crowns, veneers, inlays, onlays and bridges.
Contraindications
Full-cast gold crowns are contraindicated for partials and implants.
Preparation
Inlays and onlays can also be fabricated as a full-cast restoration. Feather-edge margin preparations are indicated for full-cast restorations, but any margin preparation may be used.
Cementation
Panavia 21 (Must be tinplated if precious metal is used)
Glass ionomer cement (GC Fuji, GC America)
Zinc Phosphate Polycarboxylate Resin Ionomer cement (RelyX, 3M ESPE)
Tech Notes
All castings are made with a metal alloy, be it non-precious, semi-precious or precious metals. Alloys are classified by their content.
Base – contents include non-precious, Chrome Cobalt or Titanium
Noble – consists of 25 percent precious alloy
High Noble – consists of 60 percent precious metal with at least 40 percent being gold
Alloy type refers to the hardness and/or softness of the material.
Type I – Extra soft
Type II – Soft
Type III– Hard
Type IV – Extra Hard (Rigid)
Non-Precious, Noble 20, White High Noble – Type IV – Very hard and rigid. These crowns are more difficult to adjust and re-polish than alloys with a high gold content.
Full Cast 40 – Type III – Yellow high noble alloy. Brand name currently used is Argenco 40 HN.
Full Cast 52 HN – Type III – Yellow high noble alloy. Brand name currently used is Argenco 52.
Full Cast 75- Type III – Yellow high noble and is an upgrade from full cast 52. The gold is slightly more yellow in color. Brand name currently used Argenco 75.
Codes
D2790 Crown Full-Cast Hi-Noble Metal
D2791 Crown Full-Cast Predominantly Base Metal
D2792 Crown Full-Cast Noble Metal