Clinical Tips Part 2: CEREC Powder & Optical Impression · Clinical Tips Part 2: CEREC Powder &...
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L ast month, our CEREC World column focused on tooth preparation for CEREC restorations. The next steps involve accurately capturing the optical impression from which dentists can design the final restoration. Prior to capturing the optical impression, the teeth need to be coated with a thin, opaque layer of white titanium dioxide powder in order to achieve uniform scatter of the light that clearly defines the surface anatomy. Once the tooth has been properly prepared, a clear liquid adhesive is generously applied with a small brush to all surfaces of the prepared tooth and the adjacent teeth that allows maximum adhesion of the powder. After the liquid is blown thin with air, the powder is then applied evenly throughout the area with an aerosol propellant spray can apparatus. Uneven or blotchy application of the powder will result in an inaccurate optical impression. Once powdered, the area is now ready for the optical impression with the infrared camera. The camera features a telecentric fixed focus lens with a 10mm depth of field. The sharpness of the image depends upon the distance between the camera face and the preparation. With the camera held in place over the teeth, the dentist looks at the computer monitor and first rotates clockwise or counterclockwise in order to align the teeth along the long axis of the video screen. Once aligned, the dentist must then tilt the lens so that it aligns parallel to the occlusal surfaces. If tilted excessively in a mesial or distal angle, the result will be a partially out of focus image. The image is captured via a foot pedal mounted on the underside of the CEREC unit. Douglas Voiers is a reconstructive and aesthetic dentist who has won top honors in the annual Dental Economics' Practice of the Year Awards. He maintains a full time practice in Avon Lake, OH and is currently a clinical instructor for restorative dentistry at the Great Lakes Educational Center in Southfield MI. Douglas recently earned a fellowship in the World Congress of Microdentistry. He is the Director of clinical dentistry at the Great Lakes Regional Educational Center in Southfield Michigan where he teaches CEREC and advanced technology dentistry, the ICOI and the AACD. Douglas can be reached at 440-933-3270 or by email at: [email protected]. Mark Morin, DDS, FWCM, graduated from the University of Detroit in 1985 and immediately started his new practice in Southfield, MI. He became one of the first dentists in North America to begin using CEREC I technology. He currently places 10-15 CEREC restorations daily and continues to study CEREC technology extensively in Germany and Switzerland with inventor, Dr. Werner Mormann. Dr. Morin maintains a 6000 sq ft office and ExperDent center. He is one of 10 internationally certified CEREC trainers in North America and has had the distinction of training some of dentistry's most well-know clinicians such as Dr. Rela Christensen and Dr. Howard Farran. Mark can be reached by email at: [email protected] or by calling 248-828-9989. Visit his website at www.drmorin.com. Clinical Tips Part 2: CEREC Powder & Optical Impression The importance of quality optical impression technique with CAD/CAM dentistry is equal to that of traditional crown and bridge impression methods in achieving a well fitting final restoration. With a little practice beforehand on typodont models, most dentists get the hang of the CEREC powder and impression technique intraorally very quickly. Most take no more than 60-90 seconds to achieve a good result before moving on to the design phase. DT Powder/Optical Impression Guidelines: l Generous liquid application - blow thin l Even titanium dioxide application without clumps or thin areas l Close proximity of camera face to tooth surface l Rotate camera to align teeth with vertical axis of screen l Assure camera angulation is parallel to occlusal plane l Be able to clearly read all pertinent preparation lines on screen What are your concerns? If you have a CEREC question, please send it by fax to 480- 598-3450 or send by email to: [email protected] or [email protected]
Transcript of Clinical Tips Part 2: CEREC Powder & Optical Impression · Clinical Tips Part 2: CEREC Powder &...
Last month, our CEREC Worldcolumn focused on tooth preparationfor CEREC restorations. The next
steps involve accurately capturing theoptical impression from which dentistscan design the final restoration.
Prior to capturing the optical impression,the teeth need to be coated with a thin,opaque layer of white titanium dioxidepowder in order to achieve uniform scatterof the light that clearly defines the surfaceanatomy. Once the tooth has beenproperly prepared, a clear liquid adhesiveis generously applied with a small brush toall surfaces of the prepared tooth and theadjacent teeth that allows maximumadhesion of the powder.
After the liquid is blown thin with air, thepowder is then applied evenly throughoutthe area with an aerosol propellant spraycan apparatus. Uneven or blotchyapplication of the powder will result in aninaccurate optical impression.
Once powdered, the area is now ready forthe optical impression with the infraredcamera. The camera features a telecentricfixed focus lens with a 10mm depth offield. The sharpness of the image dependsupon the distance between the cameraface and the preparation. With thecamera held in place over the teeth, thedentist looks at the computer monitor andfirst rotates clockwise or counterclockwisein order to align the teeth along the longaxis of the video screen. Once aligned, thedentist must then tilt the lens so that italigns parallel to the occlusal surfaces. Iftilted excessively in a mesial or distalangle, the result will be a partially out offocus image. The image is captured via afoot pedal mounted on the underside ofthe CEREC unit.
Douglas Voiers is a reconstructive and aesthetic dentist who has won tophonors in the annual Dental Economics' Practice of the Year Awards. Hemaintains a full time practice in Avon Lake, OH and is currently a clinicalinstructor for restorative dentistry at the Great LakesEducational Center in Southfield MI. Douglas recentlyearned a fellowship in the World Congress of Microdentistry.He is the Director of clinical dentistry at the Great LakesRegional Educational Center in Southfield Michigan where heteaches CEREC and advanced technology dentistry, the ICOIand the AACD. Douglas can be reached at 440-933-3270 orby email at: [email protected].
Mark Morin, DDS, FWCM, graduated from the University of Detroit in 1985 andimmediately started his new practice in Southfield, MI. He became one ofthe first dentists in North America to begin using CEREC I technology. Hecurrently places 10-15 CEREC restorations daily and continues to studyCEREC technology extensively in Germany and Switzerland with inventor, Dr.Werner Mormann. Dr. Morin maintains a 6000 sq ft office and ExperDentcenter. He is one of 10 internationally certified CEREC trainers in North
America and has had the distinction of training some ofdentistry's most well-know clinicians such as Dr. RelaChristensen and Dr. Howard Farran. Mark can be reached byemail at: [email protected] or by calling 248-828-9989.Visit his website at www.drmorin.com.
Clinical Tips Part 2: CEREC Powder & Optical Impression
The importance of quality opticalimpression technique with CAD/CAMdentistry is equal to that of traditionalcrown and bridge impression methods inachieving a well fitting final restoration.With a little practice beforehand ontypodont models, most dentists get thehang of the CEREC powder andimpression technique intraorally veryquickly. Most take no more than 60-90seconds to achieve a good result beforemoving on to the design phase. DT
Powder/OpticalImpression Guidelines:
l Generous liquid application - blow thin
l Even titanium dioxide application without clumps or thin areas
l Close proximity of camera face to tooth surface
l Rotate camera to align teeth with vertical axis of screen
l Assure camera angulation is parallel to occlusal plane
l Be able to clearly read all pertinent preparation lines on screen
What are your concerns?
If you have a CEREC question,please send it by fax to 480-598-3450 or send by email to:[email protected] [email protected]
