Korean Journal of Dental Materials (대한치과재료학회지)

Korean Society For Dental Materials (대한치과재료학회)
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A Morphometric Study of the Stainless Steel Permanent Molar Crown with Three-Dimensional Scanner

3차원 스캐너를 이용한 대구치용 기성금속관의 형태에 관한 계측학적 연구

  • Shin, Jonghyun (Department of Pediatric Dentistry, College of Dentistry, Pusan National University) ;
  • Lee, Hyeongjik (Department of Pediatric Dentistry, College of Dentistry, Pusan National University) ;
  • Jeong, Taesung (Department of Pediatric Dentistry, College of Dentistry, Pusan National University) ;
  • Kim, Shin (Department of Pediatric Dentistry, College of Dentistry, Pusan National University) ;
  • Kim, Jiyeon (Department of Pediatric Dentistry, College of Dentistry, Pusan National University)
  • 신종현 (부산대학교 치과대학 소아치과학교실) ;
  • 이형직 (부산대학교 치과대학 소아치과학교실) ;
  • 정태성 (부산대학교 치과대학 소아치과학교실) ;
  • 김신 (부산대학교 치과대학 소아치과학교실) ;
  • 김지연 (부산대학교 치과대학 소아치과학교실)
  • Received : 2018.11.08
  • Accepted : 2018.11.15
  • Published : 2018.12.30
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Abstract

The aim of this study was to compare the morphological characteristics of two types of stainless steel permanent molar crowns using three-dimensional scanners and the morphological changes of these crowns after crimping. Two types of stainless steel permanent molar crowns, PO-96 and PERMACROWN were scanned using three-dimensional scanner. Crown size, crown index (ratio of buccolingual diameter to mesiodistal diameter at height of contour), cervical convergency of crown were measured. Stainless steel crowns were crimped and re-scanned with three-dimensional scanner. Morphological changes of stainless steel permanent molar crowns were analyzed. As for the crown index, maxillary PERMACROWN was larger buccolingually and smaller mesiodistally than maxillary PO-96 and mandibular PERMACROWN was smaller buccolingually and larger mesiodistally than mandibular PO-96. Maxillary PO-96 was more convergent to cervical mesiodistally than maxillary PERMACROWN and mandibular PO-96 was more convergent to the cervical mesiodistally, buccolingually than mandibular PERMACROWN. Both types of stainless steel permanent molar crowns showed reduction of cervical circumference after crimping. Two products were morphologically different in crown size, shape and cervical convergence. Although both types of stainless steel permanent molar crowns are pre-contoured type, additional crimping is needed to achieve better marginal adaptation.

본 연구의 목적은 3차원 스캐너를 이용하여 현재 시판중인 두 종류의 대구치용 기성금속관의 형태적 특성을 비교하는 것이며, 또한 crimping 후의 치경부측 형태 변화를 분석 후 비교하는 것이다. 3차원 스캐너를 이용하여 상, 하악 대구치용 기성금속관인 PO-96과 PERMACROWN의 크기, crown index, 치경부 수렴도를 계측하였다. 이후 기성금속관들은 crimping을 통하여 치경부 형태를 조정하였고 3차원 스캐너를 통해 다시 스캔을 시행한 후 형태적 변화를 분석하였다. 상악 기성금속관의 폭경은 PERMACROWN이 PO-96에 비해 협설로 더 컸고 근원심으로는 더 작았으며, 치경부의 근원심 형태는 더 볼록하였다. 하악에서는 PERMACROWN이 PO-96에 비해 폭경은 협설로 작고 근원심으로 컸으며, 치경부의 근원심, 협설측 모두 더 볼록한 형태를 보였다. 그리고 두 기성금속관 모두 crimping 이후 치경부 변연 둘레는 감소하였다. 두 기성금속관은 크기, 형태, 치경부 수렴도에서 형태학적 차이를 보였다. 두 대구치용 기성금속관 모두 치경부 형태가 부여되어있지만 더 나은 변연적합을 위해서는 추가적인 crimping이 필요하다.

Keywords

Acknowledgement

Supported by : Pusan National University

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