Category Archives: Dental Lab Products
The overall esthetic result of an all-ceramic restoration is influenced by several factors:
• the shade of the preparation
• the shade of the restoration (ingot/block or layering material)
• the shade of the cementation material
Shade Determination of the Natural Tooth
After tooth cleaning, the shade of the non-prepared tooth and/or the adjacent teeth is determined with the help of a shade guide. Individual characteristics should also be taken into consideration. During the fabrication of highly esthetic restorations, the influence of the preparation shade on the final result is a key factor. For that reason, the shade of the preparation should be carefully determined in order to select the suitable restorative material. This is of utmost importance when dealing with severely discolored preparations. Only if the dentist determines the shade of the preparation and subsequently communicates it to the laboratory may the desired esthetics be achieved in a targeted fashion.
Die Shade Selection
In order to facilitate the proper reproduction of the desired tooth shade, the shade of the preparation should be determined with the help of an IPS Natural Die Material shade guide. This guide enables the technician to fabricate a model die similar to the preparation of the patient, on the basis of which the correct shade and brightness values of the all-ceramic restoration may be selected.
Recent research has shown that saliva contamination can hinder the bonding of solid zirconia and zirconia oxide copings. When a zirconia crown or bridge is tried in the patient’s mouth and comes in contact with saliva, the phosphate groups in the saliva bind to the zirconia oxide and cannot be rinsed out with water. Attempting to use phosphoric acid (which is full of phosphate groups) to “clean out” the saliva only makes the problem worse.
BruxZir™ Solid Zirconia, BioZX2 Translucent Zirconia, and all PFZ (porcelain fused to zirconia) restorations are fabricated from solid zirconia oxide material, which exhibits a strong affinity for phosphate groups. We can take advantage of this fact with phosphate-containing primers such as Monobond Plus (Ivoclar Vivadent) and Z-Prime™ Plus (Bisco), or with cements such as Ceramir® Crown & Bridge (Doxa Dental) to increase our bond strengths to zirconia oxide. Unfortunately, saliva also contains phosphates in the form of phospholipids.
To successfully remove saliva, it is now suggested that after try-in and before priming, the crown should be cleaned with Ivoclean, a zirconia oxide solution from Ivoclar Vivadent. This zirconia oxide solution is placed inside the restoration for 20 seconds and then rinsed out. Due to the large concentration of free zirconia oxide in the Ivoclean, it acts as a sponge and binds to the phosphate groups that were previously bonded to the restoration.
The suggested protocol is:
1. Try in zirconia-based restoration
2. Rinse saliva out of restoration with water
3. Place Ivoclean in restoration for 20 seconds, rinse and dry
4. Apply primer and then cement with product of your choice
Once the Ivoclean is rinsed out, you will have a fresh bonding surface for the Monobond Plus, Z-Prime Plus or Ceramir to bond to.
- Resin reinforced glass ionomer cement (RelyX Luting Cement, 3M ESPE; GCFuji Plus, GC America)
- Resin cements for short or over-tapered preparations (RelyX, 3M ESPE, Panavia F2.0, Kuraray)
DAL provides your office with a specialized department dedicated to splints and protective mouthguards. We are trained and certified in several technologies including DAL Comfort Guards, Flexite MP Super Clear Splints, and ProForm Sports Mouthguards.
DAL Comfort Bite Splints offer you and your patients cost-effective bruxism protection as well as protection for fixed restorative work. DAL Comfort Bite Splints are thermoformed using sudden vacuum for precise adaptation and can be fabricated for either arch. Additionally, DAL Comfort Bite Splints are easily adjusted and polished and may be added to with self-cure orthodontic if required. They are available in three design alternatives:
DAL Comfort H/S™ Bite Splint
The DAL Comfort H/S Bite Splint is our standard splint and is the same as the DAL Comfort Hard Bite Splint except the inner surface has a 1 mm layer of soft material for increased comfort and ease of delivery. Occlusal thickness of the finished splint is approximately 2½ mm. This splint is not available with canine guidance or posterior disclusion.
DAL Comfort Soft Bite Splint
The DAL Comfort Soft Bite Splint is an upper or lower soft, clear splint available with or without imprint of opposing teeth. Occlusal thickness of the finished splint is approximately 3 mm. Thinner splints are available upon request.
DAL Comfort Hard Bite Splint
The DAL Comfort Hard Bite Splint is a hard, clear, full coverage splint with even, flat contacts with opposing teeth. Occlusal thickness of the finished splint is approximately 2½ mm. This splint is not available with canine guidance or posterior disclusion.
For a detailed clinical appointment sequence, please refer to our DAL Comfort Guards Clinical Techniques Guide.