Three-dimensional evaluation of tooth preparation forms in paediatric zirconia crowns: An in vitro study.
dental practice patterns
prefabricated zirconia crown
primary teeth
tooth preparation
Journal
International journal of paediatric dentistry
ISSN: 1365-263X
Titre abrégé: Int J Paediatr Dent
Pays: England
ID NLM: 9107511
Informations de publication
Date de publication:
May 2022
May 2022
Historique:
revised:
13
08
2021
received:
09
06
2021
accepted:
21
09
2021
pubmed:
6
10
2021
medline:
13
4
2022
entrez:
5
10
2021
Statut:
ppublish
Résumé
Though prefabricated zirconia crowns (PZCs) differ from stainless steel crowns and have different preparation guidelines for optimal crown adaptation, little is known about how clinicians prepare teeth for PZCs. To investigate the prepared tooth forms for PZCs and identify the shared patterns of tooth preparation. Twenty participants prepared primary maxillary first molars and mandibular second molars for PZCs. A model with ideally prepared tooth was digitally generated as a reference. The prepared teeth were digitally scanned and superimposed on the reference. Three-dimensional analysis software was used to evaluate the discrepancy between ideal and prepared surface for overall surface and subdivided area. Half of the surfaces received excessive reduction, and 24% showed error within 0.2 mm (p < .001) in maxilla. 41.6% of surfaces showed error within 0.2 mm, and 20% were excessively prepared (p = .002) in mandible. The highest discrepancies were found at the mesiopalatal line angles (maxillary) and at the distobuccal line angles (mandibular). Significant discrepancies were observed on the occlusal surfaces, especially at the cusps. Tooth preparations for PZCs showed wide variations related to depth among the participants.
Sections du résumé
BACKGROUND
BACKGROUND
Though prefabricated zirconia crowns (PZCs) differ from stainless steel crowns and have different preparation guidelines for optimal crown adaptation, little is known about how clinicians prepare teeth for PZCs.
AIM
OBJECTIVE
To investigate the prepared tooth forms for PZCs and identify the shared patterns of tooth preparation.
DESIGN
METHODS
Twenty participants prepared primary maxillary first molars and mandibular second molars for PZCs. A model with ideally prepared tooth was digitally generated as a reference. The prepared teeth were digitally scanned and superimposed on the reference. Three-dimensional analysis software was used to evaluate the discrepancy between ideal and prepared surface for overall surface and subdivided area.
RESULTS
RESULTS
Half of the surfaces received excessive reduction, and 24% showed error within 0.2 mm (p < .001) in maxilla. 41.6% of surfaces showed error within 0.2 mm, and 20% were excessively prepared (p = .002) in mandible. The highest discrepancies were found at the mesiopalatal line angles (maxillary) and at the distobuccal line angles (mandibular). Significant discrepancies were observed on the occlusal surfaces, especially at the cusps.
CONCLUSIONS
CONCLUSIONS
Tooth preparations for PZCs showed wide variations related to depth among the participants.
Substances chimiques
Zirconium
C6V6S92N3C
zirconium oxide
S38N85C5G0
Types de publication
Journal Article
Langues
eng
Pagination
392-400Subventions
Organisme : National Research Foundation of Korea (NRF)
Organisme : Korea government
ID : NRF-2019R1G1A110045211
Organisme : Korea government
ID : NRF-2020R1C1C1006937
Informations de copyright
© 2021 BSPD, IAPD and John Wiley & Sons Ltd.
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