External fracture damage experiments were combined with finite element analysis to investigate the effects of five types of tooth preparation designs, including four different functional veneer tooth preparation designs, and a control group of full-crown tooth preparation, on the mechanical properties of lithium disilicate glass-ceramic restorations of maxillary premolar teeth.
METHODS: Specimens and finite element models were constructed for O-, OF-, POF-, and POFP-type functional veneer and full-crown preparation designs, and for lithium disilicate glass-ceramic restorations of isolated teeth.
The specimens were fatigue loaded and then pressurized along the long axis of the tooth until the restoration failed, and the fracture load at the time of failure was recorded, and the failure mode was observed by stereomicroscopy for statistical analysis.
Fracture morphology analysis of representative failed specimens. Finite element analysis was performed to record the magnitude and distribution of the maximum principal stresses in the restorations.
RESULTS: The results showed that the fracture loads were higher for O-type functional veneers than for POF-type, POFP-type functional veneers and full crowns, and higher for OF-type functional veneers than for full crowns, with statistically significant differences in the results.
The specimens were observed to fail mainly by porcelain block debonding fracture under the body microscope. Scanning electron microscopy observed that the failure of the specimens mainly originated from the tissue side of the restoration.
The maximum principal stress values for the O-, OF-, POF-, POFP-type functional veneer and full-crown restoration models increased sequentially, with the peak values distributed on the tissue surface of the restoration below the loading zone.
Conclusion: The fracture loads of maxillary premolar teeth restored with different tooth preparation designs and lithium disilicate glass-ceramic functional veneers were higher than those of full-crown restorations, and all of them exceeded the normal masticatory forces in the human posterior region.
Hint: Functional porcelain veneers can replace full-crown designs as a more minimally invasive means of tooth preparation for restoration of severely worn teeth.
GRISH®Polishing strips, discs
GRISH® polishing strips and discs are used for finishing and polishing composite resin, glass ionomer and porcelain restorations. Color specifications can be customized. The order of use is: purple → blue → green → pink, depending on the dentist's usage habits.
01 Soft and safe, will not cause damage and coloration of composite resin restorations
02 Ultra-thin, tough, and tightly fitted to the teeth
03 The polishing strip has a blank strip base in the middle for easy access to the teeth
04 Single-layer sand, uniform coating thickness, fast and time-saving polishing
05 Recommended speed 5000~10000 rpm, contact pressure 0.3~0.6N
GRISH® Zirconia Polishing Kit
GRISH® Zirconia polishing kit is suitable for full zirconia denture restorations. The high diamond content allows for efficient polishing and no glazing is required after polishing. Process description: red → yellow → white
01 Polishing effect close to the real teeth, bright and non-scratching
02 Polishing all polishing materials can be 135 ℃ high-pressure steam sterilization
03 The polishing trimming speed is fast, the grain is even and delicate, containing cooling material, low heat production under high speed, no water cooling direct grinding and polishing
Ltd. was established in June 2001, is a national high-tech enterprise specializing in the research and development, production and operation of ultra-precision grinding and polishing materials in China, and is a pioneer in the industry with a number of international and domestic independent intellectual property rights, many years of experience in product technology development and many customer applications.
GRISH provides customers with specialized and customized grinding and polishing solutions, as well as a variety of complementary and serialized precision grinding and polishing material products, processes and equipment, focusing on solving customers' high-end needs of ultra-precision grinding and polishing, and helping customers succeed!
Its ultra-precision polishing film & polishing tape, electrostatic flocking abrasive tape & polishing tape, 3D three-dimensional bump abrasive, single crystal & polycrystalline & polycrystalline like - diamond micro powder and corresponding abrasive solution, CMP polishing solution, abrasive additives and other ultra-precision polishing consumables developed and produced by GRISH are widely used in optical communication, automotive, semiconductor, LED, sapphire, ceramics, LCD, 3C electronics, rollers, oral medicine and other industries, and have been exported to many countries and regions such as USA, UK, Germany, Russia, Japan, Korea, India, Brazil, etc.
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