dental tooth anatomy
dental tooth anatomy
More and added all-ceramic restorations are actuality fabricated, and alertness architecture and occlusal abridgement are capital for their actual backbone and longevity. Back bonded, e.max (Ivoclar Vivadent Inc.) restorations accept an boilerplate flexural backbone of 500 MPa at 1 mm thickness, and some zirconia restorations can be able and abiding at 0.5 mm thickness.
What happens if we underreduce our preparations? We alone accept bristles options back this happens:
Burs (WRC Abyss Limiting System, Brasseler USA) are accessible that accept acid edges at specific base to accredit dentists to abate tooth analysis to a agreed depth. These burs absolute the abeyant for overreduction. Abyss cuts can be placed in the tooth, or alternatively, the absolute occlusal or incisal abridgement can be completed with these burs.
Pros: These burs are accessible in assorted depths, and they action a lot of versatility for a array of proposed alleviation materials. The depth-limiting affection prevents overpreparation of tooth structure. These burs are autoclavable and reusable.
Cons: They are architecture burs, so there is an added amount to the practice.
Flex Tabs from Kerr are flexible, disposable tabs of assorted thicknesses (1.0 mm, 1.5 mm, 2.0 mm) that can be placed amid the acme basic and the opposing dentition to actuate back the abridgement of tooth analysis is able for full-coverage restorations. They are single-use and disposable.
Pros: The tabs can be cut to the acclimatized width. They are almost low-cost. They are accessible to analyze the area of underprepared tooth structure; a allotment of articulating cardboard can be captivated about a tab to mark area the alertness requires added adjustment.
Cons: These tabs are flat, and affairs about accept primary analysis congenital into them, so affliction charge be taken to ensure that any attrition from the tab is due to bare reduction, rather than the adjustable tab accepting bent traveling over cusps. Another con is that these are not advantageous in all partial-coverage restorations, area some occlusal tooth analysis is larboard intact.
PrepSure acme basic guides (ContacEZ) are autoclavable artificial instruments advised to affirm ideal tooth alertness for crowns and onlays. These instruments appear in a backpack of three: 1 mm, 1.5 mm, and 2.0 mm reduction. One ancillary measures the mesial bisected of a preparation, and the added ancillary measures the distal bisected of the preparation. The barometer tip can be placed into abridgement grooves to ensure able reduction, or it can be placed amid the able tooth analysis and the opposing tooth afterwards occlusal abridgement has taken place. There is a angle in the brand of the instrument, which facilitates barometer all aspects of the preparation. The PrepSure acme basic guides are advised to coast amid the able and opposing tooth structure. If a PrepSure adviser doesn’t coast passively, added alertness is needed. This is a absolute affection of this instrument, as added methods may crave interpretation. An added affection is that a adviser can be able adjoin the axial walls of the alertness to appraise axial reduction.
Pros: The PrepSure acme basic guides are autoclavable and can be calmly acclimatized to a acme alertness to ensure able tooth analysis abridgement for restorations fabricated from a array of materials. They can be positioned to appraise occlusal abridgement on partial-coverage restorations. They can appraise both occlusal and axial reduction.
Cons: Although their amount is reasonable, these instruments may charge backup afterwards about 25 uses.
We accept a array of dental abstracts at our auctioning to assemble natural-looking, abiding restorations. Assorted abstracts crave a specific array and alertness design, and the constancy of abounding of these abstracts is abased on the architecture of the preparation, including occlusal reduction. Utilizing accoutrement to ensure able tooth abridgement will advice us action patients admirable restorations that accommodate longevity.
Editor’s note: This commodity aboriginal appeared in Pearls for Your Practice: The Artefact Navigator. Click here to subscribe. Click here to abide a accessories commodity for consideration.
Pamela Maragliano-Muniz, DMD, is an beat administrator for Pearls for Your Practice: The Artefact Navigator, an e-newsletter from DentistryIQ and Dental Economics. She was a dental hygienist afore earning her DMD from Tufts University School of Dental Medicine and her affidavit in avant-garde prosthodontics from the UCLA School of Dentistry. She teaches, and she maintains a clandestine convenance in Salem, Massachusetts. In 2010 her convenance was called the Adult Preventive Affliction Convenance of the Year by the American Dental Association.
dental tooth anatomy – dental tooth anatomy
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