Acucera - ZirAce

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Designed for any type of cement-retained implant restorations and screw-retained crowns, the ZirAce abutment is made with the patented zirconia (ZrO2) alloys (US Patent No. 6,380,113).
Unlike the titanium-fused zirconia abutment Zireal PostÇ—¢, the metal-free ZirAce abutment possesses a tooth-colored appearance while maintaining biocompatibility, phase stability, high strength, and high fracture toughness. Most importantly, the ZirAce abutment does not undergo low temperature degradation during autoclave sterilization, unlike ordinary tetragonal zirconia polycrystals (TZP), at high pressure and humidity at a temperature range of 100¨?C~300¨?C. This degradation has been a major concern in the use of TZP as femoral heads for total hip replacements because of a potential abrupt decrease in strength of TZP while aging in the human body environment.
With the zirconia-alumina based ZirAce abutments, autoclave sterilization and high-speed diamond shaping are safe, and your restorations will become highly esthetic and pleasing.
Introduction
- ZirAce abutments can be used for hex type regular fixture supported single tooth restorations in the anterior and premolar regions.
- The abutments are intended for clinical situations where esthetic requirements are high and cannot be achieved using titanium abutments.
- ZirAce abutments are prepared to desired shapes on master casts and then connected to the fixture with abutment screw for final adjustment in the patient¨•s mouth for cemented crowns.
- ZirAce abutments can be used either for screw-retained crowns or with direct application of veneering porcelain such as Eris powder of Ivoclar.
Precautions
- For dentists use only.
- Confirm that patient has no known allergies to ceramic materials.
- ZirAce abutments are designed to use the Branemark type external fixture having 4 and 5 mm platform diameter.
- Zirconia alloys used for ZirAce have superior mechanical properties compared to alumina abutments, but a potential fracture risk exists if handling of abutments is not done cautiously.
- ZirAce abutments should not be used when the axial inclination of the abutment is greater than 30 degrees from the long axis of the fixture.
- Patients who were treated with ZirAce abutments should be followed up regularly (every 3 months in first year and every 6months).
- Use of metal instruments on the finished surface should be avoided due to the possible risk of discoloration of the ceramic material.
- ZirAce abutments are delivered without sterilization so that they should be sterilized before use in patients.
- Screw stability should be checked regularly. The loosened screw may cause soft tissue inflammation and discomfort.
- Review instructions and precautions before beginning treatment. Use only as directed.
Contraindications
Patients with heavy loading conditions of the abutments are contraindicated.
Ex) Bruxism, molar replacement
Preparation Tips for ZirAce Abutments
- ZirAce abutments can be used either for cementation type final crowns or for direct application of the Eris porcelain (Ivoclar) onto the abutments.
- ZirAce abutment is connected to fixture replica on a master cast with a abutment screw and reduced to the desired height with coarse grit diamond burs.
- The preparation must be done with a high-speed handpiece under water spray (ZirAce has high fracture toughness and excellent phase stability so that a fracture risk is very low under normal situations).
- The preparation should leave a minimum abutment height of 7 mm on one side. The diameter should be no less than 4 mm with a minimum sidewall thickness of 0.7 mm.
- Do not grind connection area where ZirAce abutment sits on fixture. This may cause to deteriorate marginal fitness.
Screw Connection
- ZirAce abutments are not provided with abutment screws so that each clinician should select high quality abutment screws cautiously according to clinical cases, i.e., Branemark gold alloy screw or 3i gold tite screw etc..
- The recommended proper tightening torque of 30 Ncm should be applied to each abutment screws.
- Complete seating of the abutment should be checked with intra-oral radiograph. Due to the radiopacity of the ZirAce, the verification is very clear.
Sterilization
ZirAce abutments are delivered without sterilization so that they should be treated for 20-30 min at 120¨?C-135¨?C in an autoclave before use in patients. The ZirAce abutments do not loss their mechanical properties after the sterilization.