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Clinical protocol / Acrobat MB2

MB2 Mastery: Control-First Negotiation

MB2 Sequence

Sequence: Controlled Adaptation
01

Dentin shelf removal

Use a long-shank round bur or ultrasonic tip to remove the mesial overhanging shelf between MB1 and the isthmus.

02

Orifice localization

Locate the MB2 orifice, commonly 1.5 mm to 2 mm palatal to the MB1 orifice along the developmental groove.

03

MB2 file negotiation

Introduce the Acrobat MB2 file using feedback to confirm forward direction - never force. Use 'Available' length and then re inspect with a pre-curved hand file.

04

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

Acrobat MB2 file

Size 15, .05 taper, 17 mm short-access file.

This is the Acrobat 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
ACGP-150517RF
Pack
6 files
Clinical role
Controlled MB2 glide path
View Acrobat files

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 TransformX shaping.

TransformX Solution

Control the entry before shaping begins.

The Acrobat MB2 option supports a deliberate glide path step before the clinician transitions into TransformX ET or PT shaping. The objective is not simply to use a smaller file. The objective is to establish a controlled, reproducible path.

Access

17 mm working length option

Supports improved handpiece clearance when chamber anatomy limits positioning.

Glide path

15/.05 controlled entry

Provides a deliberate access step before larger shaping files are introduced.

Workflow

Acrobat sequence compatibility

Keeps MB2 access inside the wider EndoTech glide path and TransformX 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 TransformX 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.