DentaPort ZX Quick Guide (OTR mode)
01. What is OTR (Optimum Torque Reverse)?
The DentaPort ZX OTR Module prepares root canals while
helping to prevent file jamming inside the canal.
OTR Function Illustrations
Normal FilingOTR Action

Load90°32

1

CuttingRelease LoadCutting

Load is less than torque setting.
Filing is performed normally.

Load exceeds torque setting.
File reverses for 90º then goes forward
180º, this is repeated as necessary.

The following problems are reduced for safer and more efficient
canal shaping:
1. File breakage
2. Ledge formation in curved canals
3. Canal transportation
Also, when the handpiece is linked to the apical reverse orstop function, the working length of the canal can be properly
prepared without damaging the apex.
Since the DentaPort ZX OTR system automatically switches from
regular filing to OTR action depending on the shape and conditionof the file, filing efficiency is not greatly reduced. Also,
the instrument can be used in regular mode for pre-flaring.
Files that cut during forward rotation must be used.

02. Usage
4 Start Filing

1 PowerPress theswitch to turn on the unit.

Step on the foot control to start the motor handpiece.

 In OTR mode,“2 Memory Selection - OTR mode
Press theswitch to set the memory to the OTR mode. You
may select either M1 or M2 for the file's appropriate rotation
speed.

” appears in the rotation speed window
when the motor is running.

Initial Setting for Memories (Factory Settings)
SettingMemory
M1

M2

M3

Rotation ModeOTROTR

NormalSpeed (rpm)

300

500

250

Torque Line (Level) *113

 If the OTR release action is triggered before inserting the file

3 Torque LineDisplay

Apical Line

Rotation Speed
Display
Memoryin the canal, raise the torque line by one level.

 To change the memory parameters, refer to the Operation

12Instructions (Settings and Changing Memory).
* Set value to trigger the OTR action.

3 Check Torque Bar Reading
The torque line should be set at 1 andthe file used with a vertical motion(pecking motion).

Torque Line Display
Level 1For the OTR mode, the torque line setting represents the torque level when
the handpiece starts rotating. It is easier to switch over to the OTR mode
when this is set at a low level. A low torque setting will not have muchinfluence on the actual torque applied. In the OTR mode, filing can reach theDentaPort ZX’s maximum torque of 3.5 Ncm so filing efficiency will be thesame.
If the OTR function is triggered before the file is inserted in the canal,increase the torque line setting.

03. Linkage with Canal Measurement Function
When the contrary electrode is hooked in the corner of thepatient’s mouth, the location of the file tip can be monitored
while shaping the canal.
Also, the motor can be set to stop or reverse when the filereaches the point designated by the apical line.
Refer to the Operation Instructions for how to set the apical line (Settings andChanging Memory).

Contrary Electrode Placement

Monitor Display

Corner of mouth
Apical line

Contrary
Electrode

04. Effective Use of OTR Function
1 Pre-Flaring

OTR Mode Pecking Motion Illustrations

Perform pre-flaring if necessary. For pre-flaring select M3with theswitch to rotate the file in the regular way.

Small load(rotates 360º)

File load triggers theOTR action(reverse rotation).

Quickly pull fileup when rotation
reverses.

2 To make a glide path, use the OTR function or hand files
manually. Use a pecking motion with the OTR function.

3 To get the most out of the OTR function, advance the filedown the canal by pulling it up a little when the file load
triggers the OTR reverse rotation and then push it down
the canal (pecking motion). This is repeated again andagain. (See the illustration to the right.)
Wipe the file from time to time to keep the teeth fromgetting clogged with filing debris.

05. Possible Order of File UsageThe OTR action can be used with files that cut in a clockwise(CW) direction.
Recommended OTR Start Torque line: “1” For speed, follow
the file manufacturer’s recommendation.

FileSetting#15 t04

M2(factory setting)

2. Shape the coronaland medium third
portion - 1 mm

#25 t04

M1(factory setting)

3. Quick and easyreach of the apex

#40 t02

M1(factory setting)

1. Creating GlidePath

Pro Taper NEXT (After Making Glide Path)
Step
1. To end of working
length
2. To end of working
lengthFileSetting

2. To end of working
length

3. To end of working
lengthOTR Start Torque line: 1Speed: 300 rpm(3. If necessary)

FileSetting

BR1 (#15 t05)

BR3 (#25 t06)

OTR Start Torque line: 1
Speed: 500 rpm

BR4 (#35 t04)

(4. If necessary)
BR5 (#40 t04)

TF Adaptive (After Making Glide Path)
Step
1. To end of working
lengthX1 (#17 t04)

X2 (#25 t06)

Step
1. To end of working
lengthEndoWave OTR Sequence
Step

BioRaCe (After Making Glide Path)

2. To end of working
lengthFileSetting

SM1 (#20 t04)
OTR Start Torque line: 1
SM2 (#25 t06)

Speed: 500 rpm(3. If necessary)
X3 (#30 t07)

SM3 (#35 t06)

These procedures are for use with the OTR mode; they differ from the file manufacturer’s recommendations. Adapt usage depending on the condition of the root canal.
The product names used in this manual are the brand names or registered trademarks of each manufacturer.
* This Quick Guide is a simplified explanation of how the OTR function works. Do not fail to read the Operation Instructions before using thisinstrument.
* Specifications may be changed without prior notice due to improvements.

201603 PUB. M8131-EA