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Three-dimensional evaluation of tooth preparation forms in paediatric zirconia crowns: An in vitro study

Authors
 Yong Kwon Chae  ;  Hyeonjong Lee  ;  Hong-Keun Hyun  ;  Hyo-Seol Lee  ;  Sung Chul Choi  ;  Ok Hyung Nam 
Citation
 INTERNATIONAL JOURNAL OF PAEDIATRIC DENTISTRY, : epub., 2021-10 
Journal Title
INTERNATIONAL JOURNAL OF PAEDIATRIC DENTISTRY
ISSN
 0960-7439 
Issue Date
2021-10
Keywords
dental practice patterns ; prefabricated zirconia crown ; primary teeth ; tooth preparation
Abstract
Background: Though prefabricated zirconia crowns (PZCs) have different properties from stainless steel crowns and different tooth preparation principles for optimal crown adaptation, little is known about how clinicians prepare teeth for PZCs.

Aim: To investigate prepared tooth forms for PZCs and identify the shared patterns of tooth preparation.

Design: 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 to the reference. A three-dimensional analysis software (Gom Inspect 2018 software) was used to evaluate the discrepancy between ideal and prepared surface for overall surface and subdivided area.

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 at the mesiopalatal line angles (maxillary) and the distobuccal line angles (mandibular). There were significant discrepancies on the occlusal surfaces, especially the cusps.

Conclusions: Tooth preparations for PZCs showed wide variations related to depth among the participants.
Full Text
https://onlinelibrary.wiley.com/doi/10.1111/ipd.12918
DOI
10.1111/ipd.12918
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Lee, Hyeonjong(이현종) ORCID logo https://orcid.org/0000-0002-1669-2975
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/188114
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