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The dental cervix and root apex of the lateral incisors demonstrated remarkable intrusion in all groups A, B and C.
These teeth have open apices that are adjacent to a blood supply, and most have a short distance from the crown to the root apex. Furthermore, the apical papilla tissue beneath the mature radicular pulp at the developing apex is unique to immature permanent teeth and has a recognized regenerative potential (5).
However, they act principally through exclusion mechanisms based on the exudation of organic acids (OAs) responsible for chelating [Al.sup.3+] ions in the rhizosphere, preventing [Al.sup.3+] access to the root apex and/or by tolerance mechanisms, where [Al.sup.3+] enters the plant and is detoxified and sequestered (KOCHIAN et al., 2015).
The irrigating needle should be kept 1-2mm away from the root apex with the needle constantly moving up and down in the canal allowing for irrigant backflow.
Because the apical foramen may not correspond to the anatomic root apex, but may be coronal to it, as the course of resorption progresses, it is advisable to maintain a working length 2-3 mm short of the radiographic working length in order to prevent overextension through the apical foramen, especially in teeth exhibiting signs of apical root resorption.
Caption: Figure 2: Intraoral radiographic examination showing dilacerations along with well-defined periapical radiolucency at the root apex
Apart from being in a palatal direction, the extension of root dilaceration from the coronal portion of the root along the root apex is another interesting finding in this case, which was the main cause for the labial root perforation during access cavity preparation from a lingual approach.
Genotypic differences in Al resistance and the role of cell-wall pectin in Al exclusion from the root apex in Fagopyrum tataricum.
Using a pipette, 1 mL of 0.2% Na[N.sub.3] was placed into the glass bottle, in which the root apex of the tooth tested was immersed.
Using intraoral periapical radiographs, the variables P = complete pulp length/root length (from enamel-cementum junction [ECJ] to root apex), r = complete pulp length/complete tooth length, a = complete pulp length/root width at ECJ level, b = pulp/root width at midpoint level between ECJ level and mid-root level, and c = pulp/root width at mid-root level and pulp/tooth AR for all six teeth were measured as devised in Kvaal's and Cameriere's methods of age estimation, respectively [Figure 7].
There is also a reduction in the size of the root cap and derangement of the meristematic tissue, besides the formation of protoxylem and endoderm in regions close to the root apex with high contents of lignin (Miguel et al., 2010).
Odontogenous tumors may cause resorption in the form of sharply cut off or having rough edges root apex. The irregular rough root surface defect may indicate aggressive nature of tumor [18].