english version(pg40to78) - Pr. François Duret

F Duret and Coll. Principes de fonctionnement et applications techniques de l’empreinte optique dans l’exercice de cabinet
(traduction Anglaise)
Page 89
[Fig. 19, 20, 21: Moiré effect on top first pre molar (x3)]
is always possible when the calibration of the images between
themselves is respected.
These first two functions are of a considerable benefit in a daily use
and the quality of the latter. The definition of the sulcus and its
capture are such evident 21 things that it seems insulting to explain it; a
simple angulation of 50°, that is to say an incidence angle of 25°
enables a penetration of the rays of 2.5mm inside the gingival sulcus.
However, it is evident that the eviction would be desirable and would
facilitate the work greatly. The light ray won’t be traumatising for the
epithelial attachment cells (Fig. 23 and 24)… We will get back later to
the advantages in time and precision of the method.
Les Cahiers de Prothèse (50) pp 73 – 110, 1985