Mandibular lateral incisor root canal

The literature on mandibular incisors reveals that 11– of mandibular incisors possess two canals , although in many of these cases, the canals merge into one in the apical 1–mm of the root. Vertucci examined the root canal morphology of 3mandibular anterior teeth and reported a second canal in 27. Apical curvatures and accessory canals are common in mandibular incisors (Burns RC, Buchanan LS. Tooth Morphology and Access Openings.

Part One: The Art of Endodontics in Pathway of Pulp, 6th Ed. p. 152). A complex root canal anatomy requires modifications in the access cavity. It was first believed that mandibular incisors generally have only one root canal.

Mandibular Lateral incisor.

Figure 5) Many mandibular first premolars have significant lingual inclination of the root , making the second canal almost impossible to locate because the lingual canal often branches off the main canal at or near a 90-degree angle. If a single canal is present, it tends to be broad in the buccal-lingual direction, and this makes it difficult to remove biofilm from all root surfaces. As with all incisors , their function is for shearing or cutting food. Where two canals exist within the same root , for example the mesial root of a lower molar , lateral communication (anastomosis) in the form of fins or accessory canals , occurs between them.

Lower central and lateral incisors - The single root of a lower incisor sometimes has canals. The root of the maxillary central incisor is often bulkier than the lateral with cross-sectional anatomy varying from triangular, circular or oval in shape. The canal is often tapering towards the apex in mature teeth with minimal curvatures in the apical portion (Fig.

1 ). It is mesial (toward the midline of the face) from both mandibular lateral incisors. Root canal system of the mandibular incisor.

The mandibular central incisor is the tooth located on the jaw, adjacent to the midline of the face. Fiber-optic illumination may, likewise, be helpful during access to this tooth. Larger crown and root than mandibular 1st premolar, therefore larger pulp cavity in crown and upper root canal. Usually have ONE root and canal that may be curve usually DISTALLY.

Crown is generally tilted lingually to the long axis of the tooth. All of the mandibular central and lateral incisors had one root , but the incidence of single-rooted mandibular canines and two-rooted mandibular canines was 96. The majority of mandibular central, lateral incisors and canines had one canal (7 , 7 and 7 , respectively). Where abnormalities do occur they seem to affect the maxillary lateral incisor , which may present with an extra root , second root canal , dens invaginatus, gemination or fusion.

The pulp chamber, when viewed labiopalatally, is seen to be pointed towards the incisal and widest at the cervical level. When there are three canals there are two mesial and one distal. Teeth with four canals have two mesial and two distal canals. This is not what many were taught in dental school. A small percentage of these teeth may have two roots or two canals (4).

One previous study reported the prevalence of two canals to be 7. Some other root canal morphologies have also been reported. Types II, III, V and an additional type to Vertucci’s classification were identified. While radiographic and clinically examinations, a supplemental tooth between the mandibular right central and lateral incisor was detected.

The diagnosis was fusion, caused by union of the lateral and a supernumerary tooth. Radiographic examination showed that the mandibular right lateral incisor had two separate roots and pulp canals.

Many dentists are treating this group of teeth under general assumption, that they possess single canal. The purpose of this article is to present the treatment of lower lateral incisor with three root canals and discuss the signs of the existence of additional root canals. Source: Pecora J da Cruz Filho AM.

INTRODUCTION  Second tooth from the midline in each lower quadrant  Shares a mesial contact area with the central incisor.