Dentin shelf removal
Use a long-shank round bur or ultrasonic tip to remove the mesial overhanging shelf between MB1 and the isthmus.
Clinical protocol / Micro-Path™ MB2
MB2 Mastery: Control-First Negotiation
MB2 Sequence
Sequence: Controlled AdaptationOrifice localization
Locate the MB2 orifice, commonly 1.5 mm to 2 mm palatal to the MB1 orifice along the developmental groove.
MB2 file negotiation
Introduce the Micro-Path™ MB2 file using feedback to confirm forward direction - never force. Use 'Available' length and then re inspect with a pre-curved hand file.
Controlled advancement
Advance 1-2 mm at a time, withdraw to clean flutes, irrigate, and do not force past resistance.
File tip size 0.15 mm
Taper option .05
Micro-Path™ MB2 file
Size 15, .05 taper, 17 mm short-access file.
This is the Micro-Path™ MB2 file used in the sequence above: a short access glide-path option for controlled MB2 negotiation after the hand file has confirmed direction.
- Ordering code
- TSMP-150517RF
- Pack
- 6 files
- Clinical role
- Controlled MB2 glide path
Clinical Problem
Restricted access changes the practical demands of rotary instrumentation.
MB2 cases often become difficult before the file reaches the canal. The access angle, headroom, visibility, and tactile feedback determine whether the clinician can enter the secondary canal without forcing the instrument off-axis.
Constraint Reduced coronal headroom
Why it matters
The handpiece has less freedom to align with the MB2 entrance.
Controlled response
The 17 mm option can improve clearance during the access stage.
Constraint Tight entry angle
Why it matters
The file can engage the canal wall before the path is confirmed.
Controlled response
A controlled glide path step separates entry from shaping.
Constraint Limited visibility
Why it matters
Small changes in tactile feedback become clinically significant.
Controlled response
Progression is based on repeatable entry, not pressure.
Constraint Narrow secondary canal
Why it matters
MB2 anatomy may hide under shelf dentin and isthmus detail.
Controlled response
The file is used to confirm a reproducible path before Transform S shaping.
Transform S Solution
Control the entry before shaping begins.
The Micro-Path™ MB2 option supports a deliberate glide path step before the clinician transitions into Transform S™ ET or Transform S™ PT shaping. The objective is not simply to use a smaller file. The objective is to establish a controlled, reproducible path.
17 mm working length option
Supports improved handpiece clearance when chamber anatomy limits positioning.
15/.05 controlled entry
Provides a deliberate access step before larger shaping files are introduced.
Micro-Path™ sequence compatibility
Keeps MB2 access inside the wider EndoTech glide path and Transform S workflow.
Clinical Benefits
Benefits stay linked to the access problem.
Better coronal clearance
More controlled canal entry
Cleaner separation between access and shaping
Improved tactile confidence
More predictable handoff into Transform S shaping
Useful in restricted maxillary molar anatomy
15-point protocol checklist
A controlled search sequence for MB2 cases.
Work from diagnosis to orientation, then controlled dentine removal, passive negotiation, pathway confirmation, and referral judgment.
Interactive protocol guide Open the full 15-point MB2 guide.
Hover each point to reveal detailed clinical guidance for access,
troughing, negotiation, pathway confirmation, and referral decisions.
Download PDF 15-point chairside checklist Includes sources plus curated YouTube learning links for each point.