Evaluation of Marginal Fit and Fracture Resistance of Zirconia Implant Abutment Supporting Two Types of Metal Free CAD/ CAM Restorations

Abstract

Purpose: To evaluate marginal fit as well as fracture resistance of zirconia implant abutment supporting two types of metal free CAD/CAM restorations. Materials and methods: Twenty ready-made ZrO 2 abutments resembling lower first premolar squeezed and stabled to its conforming titanium dummy implants were implanted in epoxy resin blocks. Samples were divided into two groups in relation to the material utilized for the fabrication of the copings; group (I) (n=10): zirconia copings, group (II) (n=10): breCAM.BioHPP copings. All copings were machined using CAD/CAM system. Samples were exposed to a fatigue procedure for 20,000 cycles. Marginal fit was determined using digital stereomicroscope. Fracture resistance was registered using universal testing machine. The samples were overloaded till last fracture occurred and load at fracture was documented. Analysis of data was examined using accessible software programme (SPSS 18). Results: BreCAM.BioHPP copings, group (II), registered a statistically significant higher mean vertical marginal gap value (122.08±25.05µm) in addition to higher mean failure load value (2828.47±735.4N) compared to zirconia copings, group (I) (27.06±3.2µm) (416.06±22.16N) respectively. Conclusions: Material type used for the fabrication of the copings influences marginal fit and fracture resistance. Zirconia coping samples showed higher marginal fit and lower fracture resistance than breCAM.BioHPP coping samples.With increasing number of patients who need highly esthetic restorations, tooth colored ceramic implant abutments have been introduced such as zirconia implant abutment, even after; it has been extensively protracted for clinical use (2) .

Evaluation of Static and Dynamic Load of Two Metal Free Implant Supported Fixed Dental Prostheses

“…These cracks gradually progress until getting critical extent that cause failure. (41) The results of this study are in accordance with Montaser A (15) concluded that the PEEK (BioHPP) has superior fracture strength than zirconia ceramic under dynamic loading test. Jayesh et al (40) and other (42) reported that PEEK consider a promising restorative material as it showed higher fracture resistance than zirconia under static loading test.…”

“…In the present study methodology, the selected implants analogues were fixed in epoxy resin blocks as its young's modulus is close to that of jaw bone. (15,36) The implant analogues were fixed with special centralized device to ensure that all the specimens were placed concentrically with a standardized embedment depth. Furthermore, to standardize the frameworks thickness, the frameworks were processed by CAD/CAM technology.…”

“…These results were in accordance with previous studies. (15,16) In conclusion, the use of PEEK(BioHPP) as superstructure for implant supported prostheses should be considered when possible. Veneer fracture of PEEK (BioHPP) group can be repaired clinically by chair-side composite application for continuous use.…”

“…International, Egypt) solid bases were fabricated. (15) By special centralized device, two holes(4.00 mm diameter hole, 11 mm length) with 15mm separating distance were drilled in the base. (16) Two implant analogues(DTI implant Sistemeri SAN, Turkey) were locked in the corresponding holes to replace maxillary first premolar and first molar.…”

“…(14) Since BioHPP is a novel material used in prosthetic dentistry, further research are required to compare this material to zirconia, especially concerning their use as FDPs. (15) This study aimed to evaluate the fracture resistance of three-unit implant-supported FDPs fabricated of: 1) high translucent zirconia (HTZ) 2) PEEK (BioHPP) under static and dynamic load.…”