1. Apical Gauge File (AGF)
Definition
The Largest NiTi 0.04 Hand File that fits at Corrected Working Length after Access to the Apical Third has been accomplished.
Please note that NO INSTRUMENTATION of the Apical Third has occurred.
Negotiation only with “twiddling” motion, NOT reaming or filing.

2. Apical Gauge File (AGF)
Rationale
To help when initial Working Length Determination requires modification
To prevent over-instrumentation potentially caused by increase in working length after Straight Line Access is accomplished (Schroeder et al. 2002), especially in curved canals. a b c
File is same length, but now potentially extrudes out the apex
Schroeder KP, Walton RE, & Rivera EM. J Endod. 2002;28:474.

3. Pre-Op WL
WL angled
AGF; Long on P.
Readjusted length
Trial Pack
Obturation.
Sealer extruded

4. Pre-Op WL
AGF; Long on P.
Readjusted length
Note: Over-Instrumentation of the Palatal canal would have occurred if AGF film had not been evaluated.
Obturation.
Sealer extruded
Trial Pack

5. Apical Gauge File (AGF)
How to Determine
Use NiTi 0.04 Hand Files 15 20 25 30
35 (does not go to length)
30 would be the AGF
Note that it is not required to make the WL Film, AGF Film, and MAF Film in every case

6. Apical Gauge File (AGF)
How to Record
Start Instrumentation of the Apical Third with the AGF at Actual Working Length.
Determine need for MAF vs Trial Pack Radiograph
Canal
Ref
Cusp
EWL
(mm)
Negotiation
(yes/no)
WL File
Size
(usu. SS)
CWL
Access to
Apical 1/3
AGF File
(usu. NiTi)
Length
AWL
Apical Prep
(Stop/Open)
MAF File
Obturation
Acceptable