Q.
What is the difference between 3M™ Stainless Steel Crowns and 3M™ Unitek™ Stainless Steel Crowns?
A.
3M Stainless Steel crowns are designed to provide long-term coverage of primary molar teeth and long-term provisional coverage of first permanent molar teeth. They are manufactured with a lifelike height, contour and occlusal surface. They are pre-crimped at the cervical margin to give good retention and a "snap" fit.

3M™ Unitek Stainless Steel crowns are designed to provide long-term coverage of primary anterior, first and second primary molars, bicuspid and permanent molar crowns. They are manufactured with parallel walls and shallow occlusal anatomy
Q. Does 3M still sell 3M™ Transparent Strip Crown Forms?
A.
Yes, there are pediatric sizes and a kit available. There are various sizes of upper central and upper lateral sizes available.
Q. What type of impression material does 3M sell?
A.
Vinyl Polysiloxane (VPS), also known as addition silicone impression materials.
We have three vinyl polysiloxane impression material systems.
3M™ Express™ Putty and Wash
3M™ Imprint™ 1:4 and 2:5 Monophase Material
3M™ Imprint II™ Heavy Body/Light Body Material
Q.
Can the new 3M Dispenser, type HP (sold with Imprint II kits) be used with Express and Imprint cartridges?
A.
At this time, the new 3M Dispenser, type HP may only be used with Imprint II impression material.
Q.
Can I use the new Imprint II impression material with Express and Imprint Single Phase materials?
A.
While the chemistry of Imprint II impression material is compatible with other 3M VPS impression materials, the technique is not. Imprint II tray and wash materials were formulated to provide a coordinated 4 minute oral set. The working/setting/pouring times of other 3M products may not correspond to those of Imprint II impression material. Lastly, Express and Imprint material cartridges are not compatible with the 3M dispenser, type HP.
Q. How do I get 3M impression material out of clothing?
A.
The following directions work in most cases:
First, recognize that the material does not stain the fibers, it is adhered externally. The material can usually be gently teased out of the fabric.
If the material has been mixed, wait until it has fully set and peel, scrape or brush it off.
If the material is not mixed, try to remove most of it by wiping with gauze or tissue. Next, wet the gauze with a solvent such as alcohol, chloroform or dry cleaning solvent and wipe to remove. Many times a professional dry cleaning will remove any remaining material.
Q.
Do I have to use tray adhesive when I make an impression?
A.
Yes, we recommend the use of vinyl polysiloxane tray adhesive (and allow to dry as per product instructions). It is also recommended that strong custom trays or inflexible (preferably metal) stock trays be used. Trays which promote adhesion through holes or a lip are also preferred. Following both of these recommendations should help insure that proper support is being given to the impression upon removal from the mouth, helping prevent deformation.
Q.
Can the Activator (1.5) and Catalyst (3.5) components of the 3M™ Scotchbond™ Multi-Purpose Plus System be used with 3M™ Single Bond Dental Adhesive System to make it self curing?
A.
No, 3M Single Bond adhesive is light curable only. The Scotchbond™ Multi-Purpose Plus adhesive has been chemically designed with an added amine which allows it to chemically cure when used with the activator and catalyst components.
Q.
How dry should the dentin and enamel be after etching?
A.
The tooth structure should be slightly moist. The best way to ensure that it is not too dry or too moist is to swab the surface with a moistened cotton pellet or swab versus drying with an air syringe. Do not desiccate the tooth structure, as it is believed to cause dehydration of collagen fibrils which can lead to postoperative sensitivity and/or lowered bond strengths in some individuals.
Q.
Why don't you have the maleic acid etchant anymore?
A.
We found more offices preferred the phosphoric acid material and delivery system. In clinical studies, both performed equally in measured clinical indices such as percent retention, marginal integrity, marginal discoloration, anatomic form, secondary caries, and post-operative sensitivity. Instructionally both are used the same, so the decision was made to only carry the phosphoric acid material. The phosphoric acid etchant can be purchased separately as a gel or a liquid.
Q. Does 3M™ Vitremer™ Luting Cement have resin in it?
A.
Yes, the liquid component of Vitremer Luting Cement is a solution of polycarboxylic acids with pendent methacrylate groups, HEMA (hydroxy ethyl methacrylate) resin, a water soluble resin, water and a small amount of tartaric acid.
Q.
It's been 3 minutes and my Vitremer Luting Cement doesn't seem like it is set, especially on the pad. Is there something wrong with it?
A.
The methacrylate cure is inhibited by air (as are all methacrylate resin composites). If placed in a pile on the mixing pad, the bulk of the material will set, slowly. The air inhibited layer is somewhat thick. Because elevated temperatures, as occur in the mouth, speed the cure and a dental prosthesis removes air contact, this air inhibition is less of a factor in the mouth. After three minutes in the mouth, excess cement will have a waxy consistency and will be sufficiently set at the margin so it can be removed.
Q.
Do I need to etch before using 3M™ Vitremer™ Core Buildup Restorative?
A.
No, however proper use of 3M™ Vitremer™ Primer is critical to obtain adequate bond of the core buildup/restorative to enamel and dentin.
Q.
Can I use pretreatments or cleansers before using 3M RelyX luting (Vitremer luting cement)?
A.
No, we do not recommend the use of surface pretreatments. Treatments such as cavity cleansers, disinfectants, and desensitizers may have an adverse affect on the setting and adhesion of 3M RelyX luting cement. Optimum results are achieved when the temporary cement is removed and the preparation area is rinsed with water and swabbed to a moist dryness. Do not desiccate the tooth surface as this could result in postoperative sensitivity.
Q.
Can I purchase products directly from 3M?
A.
Our operatory products can be purchased through various authorized dental dealers.




Copyright © 1999 3M. All rights reserved.