Name of journal: World Journal of Methodology esps manuscript no: 7544 Columns: review adult stem cell-based apexogenesis



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REVASCULARIZATION AND ANGIOGENESIS

The concept of ‘revascularization’ describes the clinical healing of periapical abscesses and continued root formation in immature teeth with nonvital pulps[91]. However, it does not encompass the actual healing and repair process that takes place in these clinical cases[92].

The revascularization method assumes that the root canal space has been disinfected and the formation of blood clot can produce a matrix (e.g., fibrin) that traps cells capable of initiating new tissue formation. Its treatment effect is different from apexification because not only is the apex closed but the canal walls are thicker as well. It is also different from apexogenesis which also accomplishes a closed apex and thicker dentinal walls result from the remaining vital root pulp.

With regard to revascularization, all the studies report the continued thickening of the dentinal walls and subsequent apical closure. The root length is increased by the growth of cementum. Connective tissue similar to periodontal ligament is also present in the canal space[93].

The success of root canal revascularization is mainly due to the following factors: firstly, the immature avulsed tooth has an open apex, short root and intact but necrotic pulp tissue, so that the new tissue has easy access to the root canal system and a relatively short distance for proliferation to reach the coronal pulp horn. The speed with which the tissue completely revascularizes the pulp space is important because bacteria from outside are continually attempting to enter the pulp space. The ischemically necrotic pulp acts as a scaffold into which the new tissue grows, and the fact that the usually intact crown slows bacterial penetration because the only access for bacteria to the pulp is through cracks or enamel defects. Thus, the race between proliferation of new tissue and infection of the pulp space favors the new tissue formation. Secondly, minimum instrumentation preserves the viable pulp tissue which contributes to further development of open apex root. Thirdly, young patients have greater healing capacity and more stem cell regenerative potential. [94]

The greatest benefit of such biological approaches for dental tissue restoration over many conventional dental materials lies in the fact that reparative matrices become an integral part of the tooth, avoiding any of the problems arose from restoration retention and possible marginal bacterial microleakage. Moreover, this treatment approach strengthens the root walls of immature teeth.


NEURANAGENESIS

Pulp regeneration is not only to solve the aesthetic issues of the conventional root canal filling materials, but also to achieve the regeneration of the whole tooth vitality and restore the normal function of teeth. Dental pulp nerve regeneration can produce a protective response to maintain long-term survival of teeth when it is stimulated by mechanical, temperature, or chemical stimuli.


CLINICAL MANAGEMENT

Apexogenesis should be performed in three kinds of dental diseases of immature teeth, including reversible pulpitis, irreversible pulpitis and apical periodontitis. Pulp capping is usually applied for treating reversible pulpitis. The treatment of exposed vital pulp is accomplished by sealing the pulpal wound with CH or MTA to facilitate the reparative dentin formation. Irreversible pulpitis is often cured by pulpotomy following the steps below: (1) cervical pulpotomy to remove diseased pulp; 2) Root canal disinfection with sodium hypochlorite; (3) place a thin layer of MTA in the crown aspect of the canal with a moist cotton pellet for 1 wk; (4) remove the cotton pellet and seal the root canal access with resin-modified glass ionomer; and (5) restore the tooth with composite resin.

Traditional multiple-visit apexification with CH is the treatment choice of immature teeth suffering from periapical periodontitis, which can induce the formation of an apical hard tissue barrier. Due to the disadvantages listed above, regeneration management is recommended. Here are the protocols: (1) disinfect the root canal with sodium hypochlorite; (2) apply antibiotic paste (ciprofloxacin, metronidazole and minocycline) for 4 wk; (3) stir a file beyond the tooth apex to cause bleeding in the canal; (4) place a thin layer of MTA in the crown aspect of the canal; (5) seal the root canal access with resin-modified glass ionomer; and (6) restore the tooth with composite resin[33,95-97]. It is recommended that pulp regeneration should not be delivered to deciduous teeth as it may risk the retaining teeth and impair the eruption pattern of adult teeth[38,98].
PERSPECTIVES

Nowadays, various clinical studies are conducted using mesenchymal stem cells as transplants for treatment or to improve the functional outcomes. Stem cell-based therapies have drawn more attention to healing dental diseases. With the application of effective dental materials, stem cell-based apexogenesis may help a number of immature teeth develop. However, further work is required to increase the success rate of apexogenesis, so that this method can be widely used in the clinic.




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93 Wang X, Thibodeau B, Trope M, Lin LM, Huang GT. Histologic characterization of regenerated tissues in canal space after the revitalization/revascularization procedure of immature dog teeth with apical periodontitis. J Endod 2010; 36: 56-63 [PMID: 20003936 DOI: 10.1016/j.joen.2009.09.039]

94 Bansal R, Bansal R. Regenerative endodontics: a state of the art. Indian J Dent Res 2011; 22: 122-131 [PMID: 21525690 DOI: 10.4103/0970-9290.79977]

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P-Reviewers: Gopinath SCB, Mauro V S-Editor: Qi Y

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