RE: [ACEsthetics] FW: Curing lights

Will pass on the slideshow when I get it.

John

 

From: Dr. Lisa Marie Samaha [mailto:samahadds@pwdentalarts.com]
Sent: Wednesday, March 27, 2013 7:51 PM
To: beala@shaw.ca; 'ACEsthetics group'
Subject: RE: [ACEsthetics] FW: Curing lights

 

Very helpful info, john. Thanks and am interested in learning more.

 

Lisa Marie Samaha, DDS, FAGD, PC

251 Nat Turner Blvd, Newport News, VA 23606
Phone: (757) 223-9270 Fax: (757) 223-9264
Email: SamahaDDS@PWDentalarts.com

Website:  www.PWDentalArts.com

 

From: acesthetics@googlegroups.com [mailto:acesthetics@googlegroups.com] On Behalf Of John Wilson
Sent: Wednesday, March 27, 2013 6:25 PM
To: 'ACEsthetics group'
Subject: [ACEsthetics] FW: Curing lights

 

 

 

 

Just attended a seminar in Vancouver by Dr Price. Dr. Price is currently Professor of Prosthodontics at Dalhousie’s Faculty of Dentistry where he invented the MARC system for teaching light curing.

This was part of the Vancouver Composite Study Club and the Victoria Composite Study Club.

 

-122 million resins were placed in the US and about 60% fail within 5 years. 20 billion spent on composites per year.

- decreased curing times like 5-10 sec result in increased leachates being emitted-less if cure 20-40 sec or more

-always test your lights and keep a record-weekly-when you get a 10% reduction in testing , increase your curing time by 10%-if light measures below 300mw/cm2 - change it

- Energy = Power X Time   ie 1000mw/cm2X6 sec=6 Joules/cm2

-if you have the light at the occlusal surface and it measures 2400mw/cm2 and you cure it for 10 sec, then 24Joules /cm2 will be delivered. However if the prep goes down to the CEJ only 850 mw/cm2  results in 8.5 Joules /cm2 delivered which is good for B1 but not any darker shade

- bags over the LEDs reduce light output by 10% so increase time accordingly-Saran Wrap the best for transmission

- light protection – blue light from LEDs gets reflected back-make sure assistant has eye protection or can get premature aging of the retina, macular degeneration & photoretinitis- if see spots you have damaged the retina - 440nm - danger is where our blue curing lights emit - halogens safe compared to LEDS

- LED headlamps also a problem- 23% of dentists report a change in vision with LED headlamps

-if spikes at 440nm worst

50% of shields tested are ineffective- check out video by searching for  “The Blue Light Hazard in Medicine & Dentistry”

-don’t cook the tooth - one light that tested at 6000mw/cm2 burnt holes in the orange thin plastic

- only use it as long as you can use it on yourself - try it on your tongue

-can also cook gums - can burn thru rubber dam - to do with photons

-any that give 4000mw/cm2 can cause burns

-don’t need more than 2000mw - if higher power the chemical conversion in the composite can’t keep up  - the reaction can’t go fast enough so manufacturers are coming out with faster reaction composites

- a very easy solution to protect  everyone’s eyes - use Kerr’s Total Care Orange Shields

-cheap lights like the $30 special I got from China tested poorly-big difference between the anterior & posterior-he said it was good for sealants

 

Dr Price has offered to send me the slideshow. Will pass it on to whoever is interested or to the whole group.

 

 

 

Lake Dental Health Centre

John R Wilson

46 South Shore Rd, POBox 980

Lake Cowichan, BC, V0R 2G0

250.749.3233

 

 

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