Teaming Students Together To Evaluate Each Other's Cavity Preparation Using CAD/CAM Technology

Transcription

1 Teaming Students Together To Evaluate Each Other's Cavity Preparation Using CAD/CAM Technology

2 Michele M. Harutunian DDS, Angela Debartolo DDS, Gerald Klaczany DDS, Denise Estafan DDS,MS Mark Wolff DDS, PhD

3 NYU College of Dentistry (USA) Department of Cariology and Comprehensive Care

4 DO YOU WANT YOUR STUDENT DOCTORS TO EXCEL?

5 Goals and Objectives: -To improve Student doctors skills in Simulation laboratory -To prepare Student doctors to be better clinician

6 Instruments used: 1. CEREC Acquisition unit - Milling Machine 2. Typodont with a few prepared teeth to take a digital image of.

7 Purpose: Introducing an efficient way to magnify and critique tooth preparations

8 Part of the NYU curriculum in Esthetic dentistry for the second year students is to introduce them to CAD/CAM technology. The students are taught how to prepare typodont teeth for the fabrication of inlays, onlays and crowns both for CAD/CAM restorations and other conventional modalities.

9 Description: -The student doctor takes a digital image of the already prepared tooth for an indirect restoration. -The image is displayed on the monitor of the acquisition unit while magnified 12 times the original size. -The virtual image can be rotated 360 degrees. -Using self evaluation criteria, the faculty along with the student evaluate the work.

10 CRITERIA: Taper- Occlusally Damage to Adj. Tooth Internal Line angles Prox. Embrasure/s (Prep) Damage to Soft tissue Isthmus Width(mm)

11 CRITERIA CONTINUED.. GingivalExtension(mm) Axial Depth Pulpal Depth(mm) Gingival Shoulder Non Functional Cusp Reduction(mm)

12 Damaged neighboring tooth

13 -In order to master the CEREC technology, one must first perfect the preparation. -The software has become very user-friendly over the years, but it cannot compensate for a poor preparation. -Irregularities and undercuts in the preparation can be observed on the monitor (enlarged to 12 X). -Once an image is captured, the preparation can be evaluated and corrected before another optical impression is captured and the restoration designed and milled.

14 Distal embrasure #29 not open and mesial buccal facing wall not smooth

15 -Imaging their preparations gives the students a unique perspective and an opportunity to critique their preparation. -The magnification of the image helps them see elements of the preparation (pulpal floor, cavo-surface margin, line angles etc) that were much more difficult to see under no magnification or with standard loupes (2-4X). -This technique can be used to evaluate any preparation, e.g. direct composite, fixed and removable preparations,

16 -Students are able to see with a magnification if the neighboring tooth is damaged. -The image of the preparation may be rotated 1800 to visualize proximal surfaces, axial wall convergence/divergence and gingival floor. -The software can measure in mm the axial depth which helps in determining clearance or preparation depth.

17 Too narrow Bucco lingually Can receive a direct composite

18 distal contact not opened. Part of the Disto-gingival area was not capture

19 FEED BACK FROM FACULTY AND STUDETS In the NYUCD D2 Esthetics course, the CAD/CAM technology was not just a zoom in view of the students previous preparations but a three dimensional virtual view that not just marveled the students but faculty as well. They all agreed this made learning easier!

20 Good tapering proximal walls

21 METHOD CONTINUED. In addition, the students are able to treat more complex cases utilizing this state of the art technique software on their laptops and the acquisition unit of the CEREC machine. They can design and mill more than one restoration and insert them in one single visit!

22 Good preparation

23 FEED BACK FROM FACULTY AND STUDETS

24 Conclusion: The CEREC image of a tooth preparation helps the student evaluate their preparation and improves their skill levels in tooth preparation.