An in Vivo Study to Compare the Marginal Fit Accuracy of Crowns Prepared Using Two Different Materials

Abstract

BACKGROUND Although the metal-ceramic system is still widely used to fabricate crowns and fixed partial dentures, and is considered as the standard treatment in dentistry, aesthetic concerns have stimulated the development of new dental tooth-coloured systems such as PEEK. So, the present study was planned to check the marginal fit accuracies of conventional Porcelain Fused to Metal (PFM) crowns and Polyether Ether Ketone (PEEK) crowns. METHODS Based on the inclusion and exclusion criteria, sample size of 80 patients was considered. Out of 80 patients, 40 patients (Group I) received PFM crowns and 40 patients received PEEK (Group II) crowns. The marginal fit accuracy of crowns was checked using stereomicroscope. CBCT of the same patient with the crown was made to validate the readings obtained using stereomicroscope. RESULTS Data was analysed with the SPSS (Statistical Package for Social Sciences) version 17. Comparison of the two groups for marginal gap was done with unpaired 't' Test. For all the above tests, p value is considered statistically significant when it was ≤0.05. Four points were considered to measure the marginal gaps i.e., MB (Mesiobuccal), ML (Mesiolingual), DB (Distobuccal), DL (Distolingual). The highest marginal gap in the group I was at Mesiobuccal (MB) point i.e. 120.280000 microns and lowest marginal gap was at Distolingual (DL) point i.e. 110.127050 microns. It can be noted from CBCT that the marginal gap present in PFM crown is much greater than the PEEK crown. CONCLUSIONS Comparing the marginal fit accuracy between PFM and PEEK crowns based on the stereomicroscope readings, the marginal fit accuracy in PEEK crowns were much higher than the PFM crowns.

Effect of coping materials zirconia or polyetheretherketone with different techniques of fabrication on vertical marginal gap and fracture resistance of posterior crowns with composite veneering

“…They concluded that PEEK crowns had a greater marginal gap (49.88 ± 7.97 µm) than zirconia crowns (18.39 ± 3.1 µm). Roy et al [ 41 ] reported the same conclusions in an in vivo experiment. Moreover, Aula RA et al [ 42 ] concluded that PEEK crowns had a marginal gap of 409.09 μm, 112.86 μm, and 198.56 μm for proximal, buccal and lingual surfaces, respectively, which is higher than the clinically acceptable limit, while zirconia crowns exhibited much lower measurements, 105.08 μm proximal, 27.65 μm buccal, and 45.13 μm lingual.…”

“…In one study [ 41 ], stereomicroscopy revealed a higher marginal gap of PEEK crowns, whereas cone beam computed tomography (CBCT) revealed the contrary, with porcelain fused to metal (PFM) having a much larger marginal gap. From this, it could be concluded that the method of detecting the marginal gap affects the measured values.…”

Vertical marginal gap evaluation of PEEK and Zirconia crowns using extra-oral scanner and CAD/CAM systems (An Invitro study).

“…Our results were in agreement with a study conducted by Emad et al 25 which also showed a higher marginal gap in PEEK crowns group than zirconia crowns, this study was accomplished using direct marginal vision with stereomicroscope as well. In a vivo study done by Roy et al 26 the same results were obtained but the comparison of the PEEK crowns were with porcelain fused to metal (PFM) crowns, a higher marginal gap of PEEK crowns were observed with stereomicroscope, while in the same study when the method of measuring was changed to Cone beam computed tomography (CBCT) the results were opposite, PFM had a very larger marginal gap, we can conclude that method of measuring marginal gap has an effect on the ranges of readings. According to Byrne G, 27 the cemented or uncemented crowns have an influence on the marginal gap measurement.…”

Comparative evaluation of marginal and internal fit of endocrowns using lithium disilicate and polyetheretherketone computer-aided design - computer-aided manufacturing (CAD-CAM) materials: An in vitro study

“…compared the marginal fit of porcelain fused to metal (PFM) and PEEK full coverage crowns using a stereomicroscope and concluded that the marginal fit of PEEK crowns was higher than PFM crowns. [ 21 ]…”