Description

Intermediate Restorative Material (IRM) from Dentsply

Intermediate Restorative Material from Dentsply is designed for intermediate restorations intended to remain in place for up to 1 year. The eugenol content in the polymer-reinforced zinc oxide-eugenol composition gives the material sedative like qualities on hypersensitive tooth pulp and is a good thermal insulator as well. IRM may also be used as a base under cements and restorative materials that do not contain resin components, such as amalgams, and inlays and onlays. Among the many other applications are: emergency placement prior to complete treatment, endo access openings, pedo teeth that will soon exfoliate, and caries management programs. Its strength properties approach those of zinc phosphate cement. Other physical-related clinical advantages include: excellent abrasion resistance good sealing properties and low solubility. This material is available in an ivory shade via capsule or a powder liquid hand-mix delivery.

COMPOSITION
IRM® Material powder:
Zinc oxide
Poly-Methyl Methacrylate (PMMA) powder
Pigment.
IRM® Material liquid:
Eugenol
Acetic acid

INDICATIONS FOR USE
1. Intermediate (temporary, less than 1 year) direct restorative filling material.
2. Base material under non-resin-containing permanent restorations.

CONTRAINDICATIONS
1. IRM® Material is contraindicated for use with patients who have a known hypersensitivity or severe allergic
reaction to eugenol, acrylate resins or any of the components.
2. IRM® Material is contraindicated for direct application to dental pulp tissue (direct pulp capping).
3. IRM® Material is contraindicated as a base under resin-containing adhesives, restoratives or cements because
eugenol may interfere with the hardening and/or cause softening of the polymeric (resin) components.

Additional information

STEP-BY-STEP INSTRUCTIONS FOR USE
1. Intermediate (Temporary) Restoration
1.1 Cavity Preparation
1.1.1 Isolate the field of operation in preferred manner. Rubber dam is recommended.
1.1.2 Cavity preparation must provide for the mechanical retention of the IRM® Material.
1.1.3 If caries is present, completely excavate using low-speed and/or hand instrumentation.
1.1.4 Place matrix and wedge where indicated.
1.1.5 Gently dry preparation with cotton pellet. Avoid desiccation.
1.2 Pulp Protection: For direct and indirect pulp capping, cover the dentin close to the pulp (less than 1mm) with a hard setting calcium hydroxide liner (Dycal® Liner, see complete Directions for Use).
1.3. Dispensing IRM® Intermediate Restorative Material
1.3.1 Before dispensing, fluff powder (tumble the powder bottle) to assure uniform bulk density of contents.
Using the CAULK POWDER SCOOP #1 (large), fill measuring scoop to excess without packing – then
level scoop with spatula. Dispense 1 level scoop of powder onto a clean, non-absorbent mixing pad
or glass slab. Larger restorations may require additional scoop(s).
1.3.2 Using the dropper cap, dispense one drop of liquid for each level scoop of powder. After dispensing
liquid, replace original cap immediately to prevent evaporation and subsequent contamination.
NOTE: Keep powder and liquid separated until ready for spatulation.
1.4. Mixing IRM® Intermediate Restorative Material
1.4.1 Use a spatulation technique that quickly and thoroughly combines 50% of the dispensed powder into
all the dispensed liquid.
1.4.2 Bring the remaining powder into the mix in 2 or 3 increments and spatulate thoroughly. The mix
should be completed in approximately one (1) minute.

Technique Tips:
• A proper mix will appear quite stiff and should be stropped (wiped vigorously) for 5 to 10 seconds.
• A proper mix results in a working consistency that is smooth and adaptable. If a dry, stiff or rubbery mix is obtained, additional liquid may be incorporated. If a sticky and soft mix is obtained, more powder may be added. Slight increments of powder should be incorporated until proper consistency is reached.
1.5 Placement of mixed IRM® Intermediate Restorative material
1.5.1 Mixed material may be carried to the preparation with suitable placement instrument. Adapt, contour
and shape with appropriate instruments. Technique tip: Dipping the instrument into dry powder left
on the pad before using to adapt material will facilitate placement and minimize sticking.
1.5.2 Trim excess material. Material may be smoothed by lightly burnishing. Initial set occurs approximately
5 minutes from start of mix. Increased temperature, humidity, and powder/liquid ratio may accelerate set.
1.5.3 Upon set, remove matrix band if present. Check and adjust occlusion as needed. Additional carving or
occlusal adjustment may be accomplished with a round bur. Avoid gouging material with sharp burs
at high speed. Additional polishing is not recommended.
1.6 Periodically evaluate IRM® Material intermediate restoration until final restoration is indicated. The IRM® Material
intermediate restoration should be removed and final restoration completed within 1 year of placement.
2. Protective Base
When used as a protective base, final restorative material used must not contain polymeric resin components
(e.g. final restoration of amalgam, gold)
2.1 Complete cavity preparation and pulp protection as outlined in steps 1.1 and 1.2.
2.2 Dispense and mix IRM® Material components as outlined above in section 1.3 and 1.4.
2.3 Apply mixed material to desired dentin surfaces and depth as outlined above in section 1.5.1.
2.4 Following completion of set (approximately 5 minutes from start of mix) cavity refinement may be completed.
2.5 Complete restoration per restorative material manufacturer’s directions for use

CLEANING AND DISINFECTION INSTRUCTIONS
Use of protective barriers is recommended to avoid package contamination. Repeated disinfection may cause damage to the labels.

CLEANING AND DISINFECTION OF POWDER MEASURE SCOOP
The powder (scoop) measure may be cleaned by scrubbing with hot water and soap or detergent. The scoop, if exposed spatter or spray of body fluids or that may have been touched by contaminated hands, or oral tissues, should be disinfected with a hospital-level disinfectant. Acceptable disinfectants are EPA-registered as tuberculocidal. Disinfect the scoop by spraying with any recommended hospital-level dual or synergized quaternary ammoniums or immersing in hospital-level disinfectant such as dual or synergized quaternaries or glutaraldehyde for the contact time recommended by the disinfectant manufacturer for optimum results. Spraying with glutaraldehyde is not recommended. Chlorine based (bleach), some phenolic-based agents and iodophorbased products should not be used as they may cause surface staining and/or color alteration. Agents containing organic solvents, such as alcohol, should be avoided, as they may tend to dissolve the plastic. Water-based disinfectant solutions are preferred. The disinfectant manufacturer’s directions should be followed properly for optimum results.

Following disinfection, thoroughly rinse and dry the scoop before storage. Autoclaving the scoop is not recommended

Intermediate Restorative Material from Dentsply is designed for intermediate restorations intended to remain in place for up to 1 year. The eugenol content in the polymer-reinforced zinc oxide-eugenol composition gives the material sedative like qualities on hypersensitive tooth pulp and is a good thermal insulator as well. IRM may also be used as a base under cements and restorative materials that do not contain resin components, such as amalgams, and inlays and onlays. Among the many other applications are: emergency placement prior to complete treatment, endo access openings, pedo teeth that will soon exfoliate, and caries management programs. Its strength properties approach those of zinc phosphate cement. Other physical-related clinical advantages include: excellent abrasion resistance good sealing properties and low solubility. This material is available in an ivory shade via capsule or a powder liquid hand-mix delivery.