To measure key external anatomical landmarks relating to pulp chamber morphology of molar.
- N= 200 random human maxillary and mandibular molars with closed apexes.
Teeth was mounted with wax on a periodontal millimeter x-ray grid. Radiographs were taken. Each radiograph was examined using a stereoscopic microscope on a magnification of 10x.
One evaluator. Three direct measurement was taken from each tooth Fig 1. It was also noted weather pulp chamber ceiling was located at the level of CEJ.
Most highlighted Results:
1.For both maxillary & mandibular molars, the largest coefficient of variation values were observed for the pulp chamber height .
2.The distance from the cusp tip to pulp chamber ceiling height is approximately 6.0 mm, the distance from the pulpal floor to the furcation is approximately 3.0 mm, and the average height of a pulp chamber is 1.5 to 2.0 mm.
3.The pulp chamber ceiling was found at the level of the CEJ in maxillary molars in 98% of the specimens and in mandibular molars in 97% of the specimens
- General guideline for a more quantitative approach to endodontic molar access.
- knowledge of the general location and dimensions of the molar pulp chamber may reduce perforations of the chamber during the access process.
- Weakness: * third molars were included.
* radiographic study
A: the distance between the floor of the pulp chamber and the closest point to the furcation.
B: the distance from the ceiling of the pulp chamber to the closest point to the furcation.
C: the distance from the buccal cusp tip to the closest point to the furcation.
C-A(D): measures the distance from the buccal cusp to the pulp chamber floor
C-B(E): the distance from the buccal cusp to the pulp chamber ceiling.
B-A (F): the height of the pulp chamber.