Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methods

Objectives The aims of this study were to estimate the prevalence of lower second premolar (2Pr) agenesis and to quantify rhizolysis of the preceding primary molars. Materials and methods A descriptive and cross-sectional study was carried out to quantify root resorption of lower primary second mola...

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Autores: García-Navas Fernández de la Puebla, María Lourdes, Caleya Zambrano, Antonia María, Riolobos González, María Fe, Reyes Ortiz, Anabella María, Gallardo López, Nuria Esther
Formato: artículo
Fecha de publicación:2025
País:España
Recursos:Universidad Alfonso X el Sabio
Repositorio:Repositorio Institucional de la Universidad Alfonso X el Sabio
Idioma:inglés
OAI Identifier:oai:archive.uax.com:20.500.12080/49913
Acesso em linha:https://hdl.handle.net/20.500.12080/49913
Access Level:acceso abierto
Palavra-chave:Clinical pediatric dentistry
Infraocclusion
Primary second molar
Root resorption
Second premolar agenesis
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spelling Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methodsGarcía-Navas Fernández de la Puebla, María LourdesCaleya Zambrano, Antonia MaríaRiolobos González, María FeReyes Ortiz, Anabella MaríaGallardo López, Nuria EstherClinical pediatric dentistryInfraocclusionPrimary second molarRoot resorptionSecond premolar agenesisObjectives The aims of this study were to estimate the prevalence of lower second premolar (2Pr) agenesis and to quantify rhizolysis of the preceding primary molars. Materials and methods A descriptive and cross-sectional study was carried out to quantify root resorption of lower primary second molar (p2m) with permanent successor agenesis in panoramic radiographs using 2 methods: Bjerklin¿Bennett method (graphical method by fractions) and ratios¿ method (proportions). Results 3206 panoramic radiographs were reviewed. The final sample consisted of 174 p2m. With the graphical method, it was found that half of the sample had both roots without resorption. With the numerical method, it was observed that root length decreased with age. Almost half of them have infraocclusion and greater infraocclusion led to greater resorption. Healthy p2m showed less resorption. Conclusions The prevalence of 2Pr in the present study was 3.4%. The p2m with agenesis of the successor begin to resorb from the age of 9 years, remaining stable from this age. Those p2m without infraocclusion and healthy suffer less resorption. We consider both methods used to measure root resorption to be valid without the need for multiple sequential radiographs. We consider new studies necessary, expanding the sample and studying more variables that affect rhizolysis.SpringerUAX Archive20252025-08-0120252025-08-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.12080/49913reponame:Repositorio Institucional de la Universidad Alfonso X el Sabioinstname:Universidad Alfonso X el SabioInglésengopen accesshttp://purl.org/coar/access_right/c_abf2CC-BYhttp://creativecommons.org/licenses/by/4.0/deed.esinfo:eu-repo/semantics/openAccessoai:archive.uax.com:20.500.12080/499132026-05-28T12:40:21Z
dc.title.none.fl_str_mv Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methods
title Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methods
spellingShingle Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methods
García-Navas Fernández de la Puebla, María Lourdes
Clinical pediatric dentistry
Infraocclusion
Primary second molar
Root resorption
Second premolar agenesis
title_short Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methods
title_full Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methods
title_fullStr Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methods
title_full_unstemmed Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methods
title_sort Prevalence of lower second premolar agenesis and study of rhizolysis of primary second molars without permanent successor with 2 methods
dc.creator.none.fl_str_mv García-Navas Fernández de la Puebla, María Lourdes
Caleya Zambrano, Antonia María
Riolobos González, María Fe
Reyes Ortiz, Anabella María
Gallardo López, Nuria Esther
author García-Navas Fernández de la Puebla, María Lourdes
author_facet García-Navas Fernández de la Puebla, María Lourdes
Caleya Zambrano, Antonia María
Riolobos González, María Fe
Reyes Ortiz, Anabella María
Gallardo López, Nuria Esther
author_role author
author2 Caleya Zambrano, Antonia María
Riolobos González, María Fe
Reyes Ortiz, Anabella María
Gallardo López, Nuria Esther
author2_role author
author
author
author
dc.contributor.none.fl_str_mv UAX Archive
dc.subject.none.fl_str_mv Clinical pediatric dentistry
Infraocclusion
Primary second molar
Root resorption
Second premolar agenesis
topic Clinical pediatric dentistry
Infraocclusion
Primary second molar
Root resorption
Second premolar agenesis
description Objectives The aims of this study were to estimate the prevalence of lower second premolar (2Pr) agenesis and to quantify rhizolysis of the preceding primary molars. Materials and methods A descriptive and cross-sectional study was carried out to quantify root resorption of lower primary second molar (p2m) with permanent successor agenesis in panoramic radiographs using 2 methods: Bjerklin¿Bennett method (graphical method by fractions) and ratios¿ method (proportions). Results 3206 panoramic radiographs were reviewed. The final sample consisted of 174 p2m. With the graphical method, it was found that half of the sample had both roots without resorption. With the numerical method, it was observed that root length decreased with age. Almost half of them have infraocclusion and greater infraocclusion led to greater resorption. Healthy p2m showed less resorption. Conclusions The prevalence of 2Pr in the present study was 3.4%. The p2m with agenesis of the successor begin to resorb from the age of 9 years, remaining stable from this age. Those p2m without infraocclusion and healthy suffer less resorption. We consider both methods used to measure root resorption to be valid without the need for multiple sequential radiographs. We consider new studies necessary, expanding the sample and studying more variables that affect rhizolysis.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-08-01
2025
2025-08-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.12080/49913
url https://hdl.handle.net/20.500.12080/49913
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
CC-BY
http://creativecommons.org/licenses/by/4.0/deed.es
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
CC-BY
http://creativecommons.org/licenses/by/4.0/deed.es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:Repositorio Institucional de la Universidad Alfonso X el Sabio
instname:Universidad Alfonso X el Sabio
instname_str Universidad Alfonso X el Sabio
reponame_str Repositorio Institucional de la Universidad Alfonso X el Sabio
collection Repositorio Institucional de la Universidad Alfonso X el Sabio
repository.name.fl_str_mv
repository.mail.fl_str_mv
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