GENDEX Oralix AC Manuel De L'utilisateur page 14

Power on the system by the mains switch. Green mains lamp
stand-by mode.
Select the required exposure time with the 24-steps time selector rotary knob. The nominal
selected exposure time will light up on the front panel. Use the table here under as a
reference to select the exposure time as a function of the tooth. The exposure times given
apply for an average patient and paralleling technique. It may be necessary to use different
exposure times depending on the specific tooth and jaw thickness or density, the age of the
patient, the efficiency of the film processor, the personal preferences of the observer of the
radiograph, in case of bisecting technique, and if a film of different speed is used.
An exposure is made by means of the handswitch. The coiled cable of the
handswitch can be stretched up to 2.5 m, to ensure the required distance between
operator and x-ray source (the tubehead). During the exposure the yellow lamp
lights up and a warning tone is buzzed, indicating that x-rays are being emitted.
Press the handswitch push-button to start the exposure and keep it pressed until the
lamp goes out and the warning tone stops. If the handswitch is released during exposure, the
same will be interrupted (this is called "dead-man" operation).
EXPOSURE CHART
Object
molars, upper jaw
premolars, upper jaw
canines, upper jaw
incisors, upper jaw
molars, lower jaw
premolars, lower jaw
canines, lower jaw
incisors, lower jaw
Occlusal. , post., upper jaw
Occlusal. , ant., upper jaw.
Occlusal. , post., lower jaw
Occlusal. , ant., lower jaw.
Interproximal, posterior
Interproximal, anterior
Children: reduce times by two settings i.e. approx. 40%
Edentulous mouth: reduce times by one setting i.e. approx. 25%.
Printed on: 22 Mär 2012, 09:22:12 am; Printed by: TOBIAS BAUER
GENDEX
Exp. time (s) Exp. time (s)
D-type film
0.8
0.64
0.5
0.4
0.5
0.4
0.4
0.32
1.6
1.25
1.0
1.0
0.64
0.5
10
must light up, the timer is in
Exp. Time (s)
E-type film Digital sensor
0.4
0.32
0.26
0.2
0.26
0.2
0.2
0.16
0.8
0.64
0.5
0.5
0.32
0.25
0.20
0.16
0.12
0.1
0.12
0.1
0.1
0.08
0.4
0.32
0.26
0.26
0.16
0.12
Oralix AC