Disinfecting models

[Kacey]

What do you use to disinfect models as they come into your office? Also, do you soak them, spray them, or what? Thanks.

 

[doug]

We spray with Cavicide

 

[corona]

opticide 3 . spray or submerge....depends . but it does the trick and only 3 minutes working time .

 

[CoolHandLuke]

spray with Biosurf

 

[Kacey]

thanks to all who responded. That helps a lot.

 

[AJEL]

I'm a bit of a Germaphobe but also chemical sensetive so even though cavicide or Opticide-3® both a Ethylene Glycol Monobutyl Ether, Isopropanol works well it can generate an asthma attack (their MSDS requires gloves & respirator, & venting). Somethning new a little expensive but you can even use it in pumice pan is steriplex sd Steriplex SD | General Information | TYSS Biosolutions | Sanitizing & Disinfecting Solution Specialists
CHEMICAL NAME CAS # WT.%
Silver (Elemental) 7440-22-4 0.0300
Glycerol 56-81-5 19.0000
Sorbitol 50-70-4 0.0004
Ethanol 64-17-5 10.0000
Hydrogen Peroxide 7722-84-1 0.0300
Peroxyacetic Acid 79-21-0 0.2500
Acetic Acid 64-19-7 0.1900
Water 7732-18-5 70.0000
it is military grade (anthrax) and yet still food service safe. You can dip the model or spray on. No chemical smell (maybe a little like vinegar),no itchy hands, residual effect with out effecting acrylic processing, or model duplication.
I also sometimes use Citrus II, pleasant scent can have hand contact respirator not needed.
Citrus II | The Fresh Approach to Health Protection! - Citrus II
Whatever you choose make sure it is Sterilant/Sporicide, Tuberculocide, Bactericide, if it kills these your safe from most anything, if it can kill a new one Clostridium difficile even better!. Tuberculosis & Clostridium difficile are scary one, and hard to kill, and can live on hard surfaces for months.

 

[Kacey]

thanks! I'm going to look into that. It sounds great.

 

[Ceyram]

Deconex from Borer .. cheap & easy to use

 

[Kacey]

I went to the Borer website and there's a ton of products. Which one do you use, exactly? Thanks.

 

[AJEL]

The one used in laboratory preparation, sounds a little hazardous. Also note that alcohol base disinfection are not useful against gram negative organisms. https://www.mylabonline.com/msds/docs/06254268001.pdf

02. HAZARDS IDENTIFICATION
HAZARD DESIGNATION:
FLAMMABLE.
RISK OF SERIOUS DAMAGE TO EYES.
VAPORS MAY CAUSE DROWSINESS AND DIZZINESS.
CLASSIFICATION:
R 10; Xi
R 41
R 67
03. COMPOSITION/INFORMATION ON I
HAZARDOUS COMPONENTS:
ISOPROPANOL SOLUTION
PROPAN-1-OL

 

[Kacey]

Thanks! I've decided to go with Cavicide and spray it on.

 

[RetainerDesigner]

bleach/ water solution
1 parts bleach to 3 parts water
Soak for 10 min
rinse off
set on drying rack with fan on them.

I swear I got this from a CDC white paper for disinfecting dental models, but now I cant find it.
I talked to Gary Morgan over at Safelink
he said it is actually 1:10, bleach to water ratio.
I guess I am over doing it!

 

[doug]

When we used the diluted bleach solution, it was always 10:1.

 

[Kacey]

good to know. Thanks.

 

[AJEL]

It is 10 to 1, with adequate ventilation 12 min for disinfection. You can find information under Hypechlorite at 650-675ppm http://www.abev.com.br/controledeinfeccao/palestras/11h-willianrutala-novoguideline.pdf, it is good for gram negative & gram positive organisms, but is also toxic to us larger organisms, If you use it in your pumice pan with a little dawn wear a mask the mist generated is mucostatic irritation (eye, nose,mouth,throat,lungs, dermal: contact lenses should not be worn when working with NaOCl) http://www.aqualogicinc.net/files/MSDS_-_Liquid_Chlorine_SODIUM_HYPOCHLORITE_.pdf Print & place in your MSDS folder. It is the most common disinfection product in the world. Always rinse it is corrosive, use fresh solution as it has high VOC & looses effect very quickly. An open Sodium hypochlorite bottle degasses to keep the cap tight on bottle. The carrier for the bleach can actually be a growth medium for mold after the chlorine is gone. NaOCl is not safe at the level needed for MDR-TB, MRSA, SARS, C-dif, HepC.

And of course keep NaOCl away from chrome, copper, Nickle, aluminium, & steel, its an oxidizer and never mix with ammonia (NH3) (thats deadly).

 

[Flipperlady]

10:1 water/ bleach solution (don't soak metal framework, clasps as they will rust)
I always bag up pumice in plastic sandwich bags for single use. The plastic zip lock sandwich bag is your friend You can put cleaning solution and run
several cases seperatley in ultrasonic at the same time. You can disenfect and clean rag wheels in them. You can mix acrylic in them (doesn't stick.)
Don't send finished cases out in plastic sandwich bags because they look like plastic sandwich bags! ;-0

 

[AJEL]

since I thought of it a little chemistry fun but someone check me. ammonia & bleach (old long hand) should refresh my chemistry.
1. Oxidize NH3 to produce hydrazine (N2H4) which is deadly toxic:

2NH3 + NaOCl → N2H4 + NaCl + H2O

2. Produce toxic Cl2 and chloramine (NH2Cl) fumes by way of a series of reactions:

NaOCl + H2O → NaOH + HOCl
2HOCl → 2HCl + O2
NaOCl + 2HCl → Cl2 + NaCl + H2O
2NH3 + Cl2 → 2NH2Cl

This is the same chemistry used as chemical warfare back in World War I when army was in French trenches.

Now Chloramines are derivatives of ammonia by substitution of one, two or three hydrogen atoms with chlorine atoms and are disinfectants used to treat drinking water.
Now if there is an excess of ammonia in the mix you can get Hydrazine (N2H4) is an extremely toxic & reactive. even at low doses, irritating mucous membranes, dermal chemical burns, severe damage to the respiratory system. Prolonged exposure is damaging to internal organs, especially those involved in the liver, kidney, spleen, and thyroid. I think they use it for satellite rocket fuel.

 

[Kacey]

Impressive!

 

[rkm rdt]

You need an ethanol based hard surface disinfectant for models and impressions.

 

[lcmlabforum]

opticide 3 . spray or submerge....depends . but it does the trick and only 3 minutes working time .

3 mins for spray on hard surface for decontamination only, right?
It is important to remember we are talking about disinfection, not necessarily sterilization.
Remember those pictures of blood in implant screws Bear showed us?
All cleaning/disinfection is predicated on removal of the bioburden first. I have my assistant recover
each screw and clean with gauze soaked in Cavicide, and little microbrush to clean the inside of all impression
posts, etc.
I think the ideal would be microwave if it does not generate too much heat, and I like the bleach
solution as something that can be used to soak casts but would recommend using a 1:10 solution
made with supernatant solution instead of plain water to avoid etching the model. We create
that by soaking blocks of stone tabs made with excess stone from mixes.
LCM