Journal article
Internal fit of pressed and computer-aided design/computer-aided manufacturing ceramic crowns made from digital and conventional impressions
The Journal of prosthetic dentistry, Vol.113(4), pp.304-309
04/2015
DOI: 10.1016/j.prosdent.2014.09.015
PMID: 25488521
Abstract
No studies have evaluated the internal adaptation of pressed and milled ceramic crowns made from digital impressions.
The purpose of this in vitro study was to evaluate the internal fit of pressed and milled ceramic crowns made from digital and conventional impressions.
Thirty polyvinyl siloxane (PVS) impressions and 30 Lava COS impressions made of a prepared dentoform tooth (master die) were fabricated. Thirty crowns were pressed in lithium disilicate (IPS e.max Press), and 30 crowns were milled from lithium disilicate blocks (IPS e.max CAD) (15/impression technique) with the E4D scanner and milling engine. The master die and the intaglio of the crowns were digitized with a 3-dimensional laser coordinate measurement machine. The digital master die and intaglio of each crown were merged. The distance between the die and the intaglio surface of the crown was measured at 3 standardized points. One-way ANOVA was used for statistical analysis (α=.05).
One-way ANOVA revealed that the internal gap obtained from the Lava/press group (0.211 mm, ±SD 0.041) was significantly greater than that obtained from the other groups (P<.001), while no significant differences were found among PVS/press (0.111 mm ±SD 0.047), PVS/CAD/CAM (0.116 mm ±SD 0.02), and Lava/CAD/CAM (0.145 mm ±SD 0.024).
The combination of the digital impression and pressed crown produced the least accurate internal fit.
Details
- Title: Subtitle
- Internal fit of pressed and computer-aided design/computer-aided manufacturing ceramic crowns made from digital and conventional impressions
- Creators
- Evanthia Anadioti - Clinical Assistant Professor, Department of General Dentistry, Goldman School of Dental Medicine, Boston University, Boston, MA. Electronic address: vanadioti@gmail.comSteven A Aquilino - Professor, Department of Prosthodontics, The University of Iowa College of Dentistry, Iowa City, IowaDavid G Gratton - Associate Professor, Department of Prosthodontics, The University of Iowa College of Dentistry, Iowa City, IowaJulie A Holloway - Professor, Department of Prosthodontics, The University of Iowa College of Dentistry, Iowa City, IowaIsabelle L Denry - Professor, Department of Prosthodontics, The University of Iowa College of Dentistry, Iowa City, IowaGeb W Thomas - Associate Professor, Mechanical and Industrial Engineering, The University of Iowa College of Engineering, Iowa City, IowaFang Qian - Associate Research Scientist, Department of Preventive and Community Dentistry, The University of Iowa College of Dentistry, Iowa City, Iowa
- Resource Type
- Journal article
- Publication Details
- The Journal of prosthetic dentistry, Vol.113(4), pp.304-309
- Publisher
- United States
- DOI
- 10.1016/j.prosdent.2014.09.015
- PMID
- 25488521
- ISSN
- 0022-3913
- eISSN
- 1097-6841
- Language
- English
- Date published
- 04/2015
- Academic Unit
- Preventive and Community Dentistry; Roy J. Carver Department of Biomedical Engineering; Prosthodontics; Orthopedics and Rehabilitation; Industrial and Systems Engineering; Oral and Maxillofacial Surgery; Dental Research; Hospital Dentistry
- Record Identifier
- 9984065811102771
Metrics
27 Record Views