Extended Maintenance
As Needed for:
•
Repeate
d plunger sea l failure
•
The plun
ger shaft re peatedly gets stuck in handpiece
•
The clea
ning brush i s ineffective in removing excess gutta percha from the handpiece shaft during normal cleaning
Tools you will need:
•
Multi-Tool
•
Cleanin
g brush and Cleaning solution
•
Disposab
le cloth (na pkin, gauze, etc.)
•
Heater R
eamer Tool *
1. Prior to cleaning, ensure that your Obtura III MAX unit is turned off and fully cooled.
2. Unlatch and remove the thermal protector using the Multi-Tool.
3. Use the Multi-Tool to unscrew the needle nut from the heater thread. Set aside the needle nut. Dispose of the needle
---
(for optimum performance, Obtura applicator needles should be used only once).
4. Turn the unit back on and allow it to reach full operating temperature (200˚) in order to loosen residual gutta percha.
5. Once the full operating temperature is reached, turn off the unit and unplug.
6. Immediately extrude all remaining gutta percha into a disposable cloth by squeezing the handpiece trigger.
---
(WARNING: CONTENTS WILL BE EXTREMELY HOT!)
7. Push and hold the release button, removing the plunger shaft from the handpiece. Visually inspect the plunger seal
---
to determine if a replacement is necessary (example: metal threads at the tip of the plunger shaft are exposed or there
---
is other obvious erosion).
8. Using the heater reamer tool, clean the handpiece shaft in a back and forth motion until all visible gutta
---
percha is cleared.
9. Dip the cleaning brush into the cleaning solution, fully coating the brush. Clean the handpiece shaft with the cleaning
---
brush in a back and forth motion until all excess gutta percha is cleared.
10. Reassemble all components in the reverse order from which they were detached. Place the handpiece back
-----
on its cradle.
WARNING: AT NO POINT SHOULD ANY PART OF THE OBTURA III MAX HANDPIECE BE SUBMERGED
INTO THE CLEANING SOLUTION.
NOTE:
A) For optimal cleaning, use a Birex®-type solution to aid in disinfecting and deodorizing your Obtura III MAX unit.
B) Never spray the disinfectant solution directly on to the unit; always spray into a disposable cloth, then wipe down.
*The heater reamer tool should only be used as needed.
The Thermal Protectors must sterilized before use.
OPERATOR’S
MANUAL
HEATED
GUTTA PERCHA
SYSTEM
8
MAINTENANCE
Handpiece Bushing
Handpiece Bushing is susceptible to wear caused by the bushing misalignment. This causes the trigger pawl to wear
at the pawl engagement opening. The bushing should be aligned in the handpiece so that bushing rotation ceases. To
install the handpiece bushing, slide it in the opening at the rear of the handpiece (diagram K), and turn clockwise until
resistance is felt. The handpiece bushing should be cleaned or replaced as needed.
Plunger Shaft Assembly
Areas of inspection consist of the plunger seal and the plunger teeth. The plunger seal should be inspected for wear or
breakage. Gutta percha expressed through the handpiece will give a quick and accurate indication of the plunger seal’s
condition. If excessive gutta percha passes by the seal, the plunger seal assembly should be replaced. The plunger teeth
should be inspected for wear or chipping. The plunger shaft should be replaced if plunger teeth are badly chipped or
slipping occurs during testing. The plunger shaft of the Obtura III MAX should be checked for bending; if it will not roll
smoothly on a piece of glass or flat tabletop (indicating a bow or bend), it should be replaced, as the use of a bent shaft
may cause damage to the heater bore.
Plunger Seal Assembly
To remove the plunger seal assembly, first locate the Multi-Tool’s small hex shape opening (diagram L). Then heat the end of the
plunger shaft (a lighter will work; please use precaution) to soften the thread-locker. After the thread-locker softens, carefully
insert the plunger seal assembly within the hex shape opening, and unscrew the plunger seal assembly from the plunger shaft
(diagram M). To replace the assembly, thoroughly clean the end of the plunger, using extra care, to be sure the threads are clean
and dry. Re-apply and tighten the plunger seal assembly using the Multi-Tool’s hex utility once again. Do not over-tighten.
Needle Nut
The needle nut may become filled with gutta percha, which will inhibit complete tightening and thermal transfer from
the heater to the applicator needle. The needle nut threads can be cleaned with a 1/4-28 tap, but it’s usually more
efficient to replace it. The needle nuts can be collected and cleaned thoroughly at a later date for re-use. If the needle
nut does become filled with gutta percha, it may indicate that the needle nut has been tightened insufficiently. Use the
Multi-Tool to assure proper fit.
Handpiece Cable Assembly
The handpiece cable should be thoroughly inspected at the handpiece entry point for broken wires and cracks in the cable
housing (may be due to the frequent bending in this area). These signs are an intermittent problem where the unit will
work fine initially, but when the handpiece cable is bent, the unit stops heating altogether. If these conditions exist, the
error codes on the Obtura III MAX display can diagnose them (see error codes chart on page 9).
K
L
M
MAINTENANCE
9
