english version(pg40to78) - Pr. François Duret

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F Duret and Coll. Principes de fonctionnement et applications techniques de l’empreinte optique dans l’exercice de cabinet (traduction Anglaise) Page 103 [Fig 39: comparison of manufacturing of a micro-drill and the sculpture of crowns] MATERIALS The realisation of a prosthetic piece necessarily needs successive mouldings and in the most majority of cases, lost wax process. We will not mention the multiple “inevitable” errors inherent to the manufacturing process, and focus on the problem of the dental biomaterial as it exists currently, for conjoined prosthesis (Fig 40 and 41). In the majority of cases, we use: - casting metals, covered or not in ceramics or compound resins - and in a future we hope to be close, amorphous casting glass and “ceramised” later by thermal treatment. But in every case the material will be casted or moulded in our laboratories with limited performances if we compare them to those of the same type from industrial laboratories. This manufacturing mode of our prosthetic pieces presents in our opinion 2 major disadvantages: 1) it rejects any material which won’t cast or be moulded with the technological means of our laboratories. Thus are rejected a number of biocompatible substances for the simple and unique reason that our “home-made” technology doesn’t let us work on them. 2) It requires: - heavier and heavier technical material - more and more qualified labor - a manufacturing time that always increases with new clinical needs which are legitimate. Les Cahiers de Prothèse (50) pp 73 – 110, 1985
F Duret and Coll. Principes de fonctionnement et applications techniques de l’empreinte optique dans l’exercice de cabinet (traduction Anglaise) Page 104 [Fig 40: The imprecision cycle (direct method) 1. impression 2. coating 3. casting 4. finishing 5. luting Fig 41: The imprecision cycle (indirect method) 1. impression 2. extraction of impression 3. casting and plaster 4. wax 5. coating 6. casting 7. finishing 8. luting] Les Cahiers de Prothèse (50) pp 73 – 110, 1985
Page 40 and 41: F Duret and Coll. Principes de fonc
Page 78: F Duret and Coll. Principes de fonc

english version(pg40to78) - Pr. François Duret

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