Maxillary first premolar roots

Although it usually has two canals, it may rarely have three and this third canal can easily be missed. Three-rooted maxillary first premolars are uncommon, with an incidence of 0. Mandibular second premolars have been shown to have root canal at the apex in 97. Most commonly biroote the maxillary first premolar is a transitional tooth between incisor and molar.

Loss of the posterior molars subjects the premolars to heavy occlusal loads.

Removable appliances increase torque on these frequently clasped teeth, and the additional forces, in concert with deep carious lesions, can induce heavy calcification of the pulp chambers. Upper 1st premolars - roots. Lower 1st and 2nd premolars (bicuspids) - Just have root. Variability in the number of root canals. Root canal morphology of the maxillary first premolar.

Vertucci FJ, Gegauff A. Four hundred maxillary first premolars were decalcifie injected with dye, cleare and studied.

The canal configurations were categorized as: had one canal, had two canals, and had three canals at the apex. If the mesiodistal distance distance is equal to or wider in the root than the crown, expect three roots. The number of canals each first premolar have – have canals, have canal, and have canals. Type IV, are Type II, are Type I. As with the first maxillary premolar , the apical third of the root may curve quite considerably, mainly to the distal, sometimes buccally.

The access cavity is similar to the first premolar. The frequency of two roots is more than in Caucasoids and less than in Mongoloids. The roots maybe completely separate or arise as twin projections from a common mid-trunk.

The maxillary first premolar has variable morphology but is generally considered to have two roots and two canals (Fig. 8). The buccal cusp is usually about mm longer than the lingual cusp. The crown is angular, and the buccal line angles are prominent. The maxillary second premolar and both the mandibular first and second premolars usually have one centrally located root canal.

So Chinese population has more tendency towards having single root maxillary first premolar. Numerous studies using the clearing method showed a higher incidence of this anatomic variation, ranging from 1. Roots on maxillary premolars may penetrate the anterior part of maxillary sinus as a result of accidental trauma or during tooth extraction because of close relation of the roots to sinus walls.

Discuss the general features of permanent posterior teeth. Similar to the first premolar in coronal morphology, the second premolar varies mainly in root form. Its crown is narrower in the buccal-palatal dimension and slightly wider in the mesial-distal. Maxillary Second Premolar. The canal orifice is centrally located but often appears more as a slot than as a single ovoid opening.

Root contour form of the maxillary first premolar from the buccal aspect still bears a close resemblance to the maxillary canine. The mandibular second premolars usually develop from five lobes—three buccal and two lingual. However, it is about 3–mm shorter than maxillary canine.

The root of the mandibular second premolar is _____ than that of a mandibular first premolar , but _____ than the roots of the maxillary premolars. What is the approximate percentage of times that the permanent maxillary first premolar has one root ? Which of the following permanent teeth can have a lingual pit that is at risk for caries? The upper first premolar has Mesial Marginal Developmental Groove in its mesial aspect. It also has long central groove and no supplement groves on its occlusal surface.

Also of the upper premolars have roots. Al-Ghananeem MMF, et al. Number of roots and canals in maxillary first premolars : study of an Andalusian population.

Contemporary Endodontic Retreatments: An Analysis based on Clinical Treatment Findings.