Statement of problem
Demand is increasing for polyetheretherketone (PEEK) as a fixed dental prosthesis core material. However, information is lacking about how the precision of these restorations is affected by the fabrication procedures.
The purpose of this in vitro study was to evaluate the influence of different fabrication techniques on the marginal precision of PEEK single-crown copings.
Material and methods
A stainless-steel master die was designed to simulate a prepared mandibular second molar to receive ceramic crowns. Thirty PEEK copings were fabricated and divided into 3 groups (n=10) according to the fabrication technique: milled from a prefabricated PEEK blank by using a computer-aided design and computer-aided manufacturing (CAD-CAM) system (PC); pressed from prefabricated PEEK pellets (PP); and pressed from PEEK granules (PG); in addition, 3-mol yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) copings (n=10) were produced by using the same CAD-CAM system and served as a control. Marginal precision measurements (in μm) were recorded at 4 reference points on each coping by using a digital microscope. The data obtained were statistically analyzed by using 1-way ANOVA and the pair-wise Tukey (HSD) test to study the difference between group mean values (α=.05).
The overall mean ±standard deviation marginal gap at the marginal opening for the copings was 78 ±10 μm for PEEK granules copings, 72 ±9 μm for PEEK pellet copings, 45 ±6 μm for PEEK CAD-CAM copings, and 43 ±1 μm for the 3Y-TZP CAD-CAM control. A statistically significant difference was found between the milled and pressed copings as indicated by the ANOVA test (P<.001). The pair-wise Tukey honestly significant difference (HSD) test showed a nonsignificant difference (P>.05) between milled 3Y-TZP and milled PEEK copings; moreover, no significant difference was observed between the PEEK copings pressed from pellets or granules (P>.05).
The marginal precision of PEEK CAD-CAM–fabricated copings showed significantly lower mean marginal gap values than PEEK pressed copings. The marginal gap mean values recorded were all within a clinically acceptable range (120 μm).
To read this article in full you will need to make a payment
Purchase one-time access:Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online access
One-time access price info
- For academic or personal research use, select 'Academic and Personal'
- For corporate R&D use, select 'Corporate R&D Professionals'
Subscribe:Subscribe to Journal of Prosthetic Dentistry
Already a print subscriber? Claim online access
Already an online subscriber? Sign in
Register: Create an account
Institutional Access: Sign in to ScienceDirect
- Contemporary materials and technologies for all-ceramic fixed partial dentures: a review of the literature.J Prosthet Dent. 2004; 92: 557-562
- Current ceramic materials and systems with clinical recommendations: a systematic review.J Prosthet Dent. 2007; 98: 389-404
- The marginal accuracy of zirconia fixed dental prostheses is influenced by manufacturing technique.J Prosthet Dent. 2009; 101: 239-247
- PEKK (polyetherketoneketone) as a prosthetic material-a review.Int J Recent Sci Res. 2018; 9: 25724-25726
- Possible application of BioHPP in prosthetic dentistry: a literature review.J of IMAB. 2018; 24: 1896-1898
- PEEK biomaterials in trauma, orthopedic, and spinal implants.Biomaterials. 2007; 28: 4845-4869
- Resin bonding to three types of polyaryletherketones (PAEKs)-durability and influence of surface conditioning.Dent Mater. 2014; 30: 357-363
- Modified PEEK resin-bonded fixed dental prosthesis as an interim restoration after implant placement.J Prosthet Dent. 2016; 116: 637-641
- Using modified polyetheretherketone (PEEK) as an alternative material for endocrown restorations: A short-term clinical report.J Prosthet Dent. 2017; 117: 335-339
- Physicochemical and biological assessment of PEEK composites embedding natural amorphous silica fibers for biomedical applications.Mater Sci Eng C Mater Biol Appl. 2017; 79: 354-362
- Strength of poly-etherether-ketone: effects of sterilization and thermal ageing.Polym Test. 2013; 32: 1001-1005
- Three-unit reinforced polyetheretherketone composite FDPs: Influence of fabrication method on load-bearing capacity and failure types.Dent Mater J. 2015; 34: 7-12
- Applications of polyetheretherketone (PEEK) in oral implantology and prosthodontics.J Prosthodont Res. 2016; 60: 12-19
- The Use of a modified polyetheretherketone (PEEK) as an alternative framework material for removable dental prostheses. A clinical report.J Prosthodont. 2016; 25: 580-584
- Fracture load and failure types of different veneered polyetheretherketone fixed dental prostheses.Clin Oral Investig. 2016; 20: 2493-2500
- Polyetheretherketone-a suitable material for fixed dental prostheses?.J Biomed Mater Res B Appl Biomater. 2013; 101: 1209-1216
- Success and survival of various types of all-ceramic single crowns: A critical review and analysis of studies with a mean follow-up of 5 years or longer.Int J Prosthodont. 2017; 30: 168-181
- Relationship between crowns and the periodontium: a literature update.Quintessence Int. 2010; 41: 109-126
- Precision of fit: zirconia three-unit fixed dental prostheses.Clinic Oral Investig. 2009; 13: 343-349
- Influence of film thickness on joint bend strength of a ceramic/resin composite joint.Dent Mater. 1996; 12: 245-249
- Marginal accuracy and fracture strength of conventional and copy-milled all-ceramic crowns.Int J Prosthodont. 1995; 8: 303-310
- Influence of porcelain veneering on the marginal fit of Digident and Lava CAD-CAM zirconia ceramic crowns.J Adv Prosthodont. 2010; 2: 33-38
- Evaluation of the marginal accuracy of different all-ceramic crown systems after simulation in the artificial mouth.J Oral Rehabil. 1999; 26: 582-593
- Determination of the minimum number of marginal gap measurements required for practical in-vitro testing.J Prosthet Dent. 2000; 83: 40-49
- Effect of incompatibility stress on the fit of metal ceramic crowns.J Dent Res. 1987; 66: 1341-1345
- Marginal fit consistency of copy-milled all-ceramic crowns during fabrication by light-and scanning-electron microscopic analysis in vitro.J Oral Rehabil. 1997; 24: 871-881
- Simulation of clinical fractures for three different all-ceramic crowns.Eur J Oral Sci. 2014; 122: 245-250
- Vertical marginal discrepancy of ceramic copings with different ceramic materials, finish lines, and luting agents: an in vitro evaluation.J Prosthet Dent. 2004; 92: 250-257
- Evaluation of the marginal fit of a zirconia ceramic computer-aided machined (CAM) crown system.J Prosthet Dent. 2010; 104: 216-227
- Comparison of prosthetic models produced by traditional and additive manufacturing methods.J Adv Prosthodont. 2015; 7: 294-302
- Method for marginal measurements of restorations: accessory device for toolmakers microscope.J Prosthet Dent. 2000; 83: 362-366
- Comparative in vitro evaluation of CAD-CAM vs conventional provisional crowns.J Appl Oral Sci. 2016; 24: 258-263
- In vitro marginal adaptation of alumina porcelain ceramic crowns.J Prosthet Dent. 1994; 72: 585-590
- Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings.Dent Mater J. 2012; 31: 601-609
- Marginal fit of heat-pressed vs. CAD-CAM processed all-ceramic onlays using a milling unit prototype.Oper Dent. 2008; 33: 644-650
Published online: July 04, 2020
© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.