Sales Training 2014 - Dentistry

100 ►  Essentials of Preclinical Conservative Dentistry

Figure 9.17  Key-shaped preparation on a man- dibular first molar .

Figure 9.14  Butterfly-shaped preparation on a maxillary premolar.

Figure 9.18  Plus-shaped preparation on a man- dibular second molar.

Figure 9.15  C-shaped and I-shaped prepara- tion on a maxillary molar. Note that it does not involve the oblique ridge.

(d) Mandibular first molar: ‘Key-shaped’ preparation (Fig. 9.17) (e) Mandibular second molar: ‘Plus-shaped’ preparation (Fig. 9.18) 3. Aesthetic considerations: The position of the tooth in the arch not only dictates the selection of the restorative material, but also the design of the tooth preparation so as to maximise the aesthetic results of the restora- tion. 4. Preservation of healthy and vital tooth structure: Healthy tooth structure should not be removed unless justified, as tooth structure once removed cannot be put back. 5. Restorative material being used: This guides the outline form, for example the

Figure 9.16  H-shaped preparation on a maxillary molar involving oblique ridge.

PCD Chapter 09_p092-p115.indd 100

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