PubMed · 5212629
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F Del Río de las Heras. [Seven-eights crown].. https://pubmed.ncbi.nlm.nih.gov/5212629/
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The 1-piece, implant-supported abutment and crown, colloquially described as the UCLA abutment, commonly is used to fabricate single, screw-retained crowns. This abutment was designed to allow attachment of the crown directly to the implant and requires a waxing and casting procedure by a laboratory technician. A new prefabricated abutment has been developed that uses a similar approach but does not require the waxing and casting process. The PDQ abutment is made from a metal-ceramic alloy that is custom contoured by grinding to support a porcelain veneer. Porcelain then is fired to the contoured abutment to develop the 1-piece artificial crown. This article describes the use of the PDQ abutment.
The dental technician works with rigid casts and dies that do not tip or depress. The dentist must use fixed prostheses that have been fabricated in a laboratory setting in a clinical environment that is significantly different. Periodontal ligaments permit individual teeth to move within their boney housing. Mandibles tip and bend, but articulators cannot simulate all this activity. A relatively simple technique for adjusting inclines on the mounted definitive and opposing casts can compensate for many of the differences between rigid casts and subtle clinical tooth movement. This procedure can reduce required chairtime for adjusting the occlusion on crowns and fixed partial dentures.
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