Furcation Groove of Maxillary First Premolar, Thickness, and Dentin Structures

By Lammertyn P, Rodrigo S , Brunotto M and Crosa M

Date: 03/2009
Journal: JOE


Purpose: To accomplish an anatomic study of furcation grooves and dentin width in buccal roots of MFPs.

  •N= 141 extracted MFPs with well-formed roots without endodontic treatment from patients aged 35-65 years. 

n= 20 randomly selected for measurement out of 117 MFPs that had palatal groove in buccal roots.


  • Macroscopic study to determine the percentage of buccal roots with palatal groove along the bifurcation aspect. Fig1
  • Palatal root was eliminated by diamond disk
  • Three horizontal slices made to buccal root:

•coronal (2 mm from furcation) •apical (2 mm from apex)

•middle (equal distant between both) üStatistical analysis by using the coefficient of correlation of Pearson (r2) and paired t test.

Most highlighted Results:

1.The palatal groove in the buccal root was present in 83% of the sample 117/141

2.Middle third – depth of the groove was negatively correlative with dentin thickness of palatal wall.

3.Coronal and middle thirds – furcation groove angle had a positive correlation with RDT

4.Coronal and middle thirds – dentinal width of the buccal wall was significant larger than that of the palatal wall.

Clinical significance: 

Canal shape generally reproduces the external root anatomy, in many cases presenting a kidney-shaped transversal section à consideration throughout cleaning and shaping plus post space prep to avoid errors/mishaps.

Strength:   Multiple comprehensive measurements

Weakness: didn’t consider patients’ ages unlike Bellucci and Perrini, small sample size