17/05/2026
What is a Truss Access Opening
Instead of one large traditional access cavity, you prepare:
Separate small access openings (usually for mesial and distal canals)
Leave a dentinal bridge (truss) in between
This preserves structural integrity of the tooth.
Where it’s commonly used:
Mandibular molars
Maxillary molars
(Only when canals are well separated)
Purpose / Advantages:
Preserves pericervical dentin (PCD) - critical for fracture resistance
Maintains tooth strength - reduced risk of vertical fracture
Fits into minimally invasive endodontics philosophy
Better long-term prognosis in structurally compromised teeth
Limitations / Concerns:
Reduced visibility & straight-line access
Higher chance of:
Missed canals
Inadequate debridement
More technique-sensitive
Requires:
Magnification (loupes or microscope)
Good pre-op imaging (CBCT ideally)
Clinical judgment is key
A truss access is not for every case. Avoid in:
Calcified canals
Retreatment cases
Complex anatomy
Limited visibility situations
In simple terms
Think of it like:
Instead of removing the entire roof of the pulp chamber, you create two small windows and keep a “bridge” in between.