The Renfert Retention rings, zinc plated is a dental laboratory product supplied by Renfert for dental laboratory casting and model retention. Catalog code 3930000.
Renfert Retention rings, zinc plated is a casting ring from Renfert. Each pack holds 1000. Manufacturer part number 3930000.
Find it on our Investment & Casting shelf, under Casting Rings & Liners.
Orders placed before 3 PM ET ship the same day when the item is on our shelf (otherwise within 3 business days), and ground shipping is free over $10.
Product
- Manufacturer
- Renfert
- Manufacturer #
- 3930000
- Item code
- 043-0236
- UPC / Barcode
- 3930000
Catalog path
- Marketplace
- Laboratory
- Category
- Investment & Casting
- Subcategory
- Casting Rings & Liners
Ordering
- Status
- Ships in 3 business days
More from Casting Rings & Liners
Stocked in the same subcategory.
Questions
What is Renfert Retention rings, zinc plated used for?
The Renfert Retention rings, zinc plated is a dental laboratory product supplied by Renfert for dental laboratory casting and model retention.
How many come in a pack of Renfert Retention rings, zinc plated?
1000 per pack; the price shown is per pack.
When does it ship?
In-stock orders placed before 3 PM ET ship the same day; anything not on our shelf ships within 3 business days.Ground shipping is free over $10.
About casting rings
A casting ring is the metal or silicone tube that holds the investment while the refractory mold for casting a dental restoration is made. The thermal expansion of a metal ring is less than that of the investment.
A casting ring is a metal or silicone tube in which a refractory mold is made for casting dental restorations. In the lost-wax technique a wax pattern is surrounded with a refractory slurry that sets, the pattern is removed by heat, and metal or ceramic is cast into the mold that is left.
How casting rings, ring formers and sprue bases differ
- Casting Rings — The metal or silicone tube that holds the investment.
- Ring Formers & Patterns — A removable form used in place of a steel ring.
- Sprue Bases & Rubber Formers — The base under the ring that shapes the funnel for the metal.
What to look at when choosing
Ring or ringless: in one study of nickel-chromium copings, conventional casting with a ringless investment system gave a significantly better marginal fit than casting with a metal ring.
Size: rings and formers are listed by size, and the bases by the ring they fit.
Sources: The Glossary of Prosthodontic Terms, 9th edition (J Prosthet Dent 2017) · Marginal fit of Ni-Cr cast copings made with metal ring and ringless investment systems, 2016 (PMC4762291)
