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      The two extremes of physiological tooth resorption in primary tooth with or without the permanent successor tooth

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          ABSTRACT

          Introduction:

          Assessment of two radiographic images reveals two distinct, extreme situations of physiological tooth resorption, characteristic of primary teeth with or without permanent successor, due to partial anodontia.

          Discussion:

          In all primary teeth, rhizolysis begins after the completion of formation, thanks to the apoptosis of their cells. When apoptosis induced by cementoblasts has denuded the root of these cells, the process of rhizolysis inevitably begins: This will be accelerated by mediators arising from the pericoronal follicle. When there is no permanent successor due to partial anodontia, rhizolysis occurs extremely slowly, and months later, without the epithelial rests of Malassez that were dead due to apoptosis, alveolodental ankylosis becomes established, and the tooth will gradually be replaced by bone, still within a physiological context.

          Conclusion:

          Rhizolysis and physiological tooth resorption may occur rapidly or slowly, early or late, and this depends on the presence of the permanent tooth, or its absence due to partial anodontia.

          RESUMO

          Introdução:

          A partir de duas imagens radiográficas, revelam-se duas situações extremas distintas de reabsorção dentária fisiológica próprias dos dentes decíduos com e sem o sucessor permanente por anodontia parcial.

          Discussão:

          Todos os dentes decíduos iniciam a rizólise depois de completada a formação, graças à apoptose de suas células. Sem cementoblastos, a raiz, focalmente desnuda pela apoptose cementoblástica, inevitavelmente inicia a rizólise, que será acelerada pelos mediadores advindos do folículo pericoronário. Quando não houver o sucessor permanente por anodontia parcial, a rizólise fica muito lenta e, meses depois, sem os restos epiteliais de Malassez mortos por apoptose, a anquilose alveolodentária se estabelece e o dente será gradativamente substituído por osso, ainda dentro de um contexto fisiológico.

          Conclusão:

          A rizólise e a reabsorção dentária fisiológica podem ser rápidas ou lentas, precoces ou tardias, e isso depende da presença ou ausência do dente permanente, por anodontia parcial.

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          Most cited references8

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          Apoptosis in regressive deciduous tooth germs of Suncusmurinus evaluated by the the TUNEL method and electron microscopy

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            Reabsorções dentárias nas especialidades clínicas

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              Reabsorções dentárias nas especialidades clínicas

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                Author and article information

                Journal
                Dental Press J Orthod
                Dental Press J Orthod
                dpjo
                Dental Press Journal of Orthodontics
                Dental Press International
                2176-9451
                2177-6709
                15 December 2021
                2021
                : 26
                : 6
                : e21ins6
                Affiliations
                [1 ]Universidade de São Paulo, Faculdade de Odontologia de Bauru (Bauru/SP, Brazil).
                [2 ]Universidade de São Paulo, Faculdade de Odontologia de Ribeirão Preto, Programa de Pós-graduação em Odontopediatria (Ribeirão Preto/SP, Brazil).
                [3 ]Cirurgião bucomaxilofacial da Secretaria de Estado da Saúde (Porto Velho/RO, Brazil).
                [4 ]Centro Universitário de Adamantina (Adamantina/SP, Brazil).
                Author notes

                AUTHORS’ CONTRIBUTIONS:

                Alberto Consolaro (AC)

                Moacyr Tadeu Rodrigues (MTR)

                Renata Bianco Consolaro (RBC)

                Giovana Gonçalves Martins (GGM)

                Conception or design of the study:

                AC.

                Data acquisition, analysis or interpretation:

                AC, MTR, RBC, GGM.

                Writing the article:

                AC, MTR, RBC, GGM.

                Critical revision of the article:

                AC, MTR, RBC, GGM.

                Final approval of the article:

                AC, MTR, RBC, GGM.

                Overall responsibility:

                AC.

                The authors report no commercial, proprietary or financial interest in the products or companies described in this article.

                Author information
                http://orcid.org/0000-0002-5902-5646
                http://orcid.org/0000-0002-4951-5836
                http://orcid.org/0000-0001-8841-6913
                http://orcid.org/0000-0001-7021-0028
                Article
                00200
                10.1590/2177-6709.26.6.e21ins6
                8690456
                34932715
                3ead93c4-8c01-43dc-bd57-1a1ea34a98bd

                This is an open-access article distributed under the terms of the Creative Commons Attribution License

                History
                : 05 October 2021
                : 13 October 2021
                Page count
                Figures: 1, Tables: 0, Equations: 0, References: 7
                Categories
                Orthodontic Insight

                primary tooth,rhizolysis,alveolodental ankylosis,replacement resorption

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