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Implants preserve the integrity of the teeth adjacent to the edentulous area, and it has been shown that dental implant therapy is less costly and more efficient over time than tooth-supported FPDs for the replacement of one missing tooth. The major disadvantage of dental implant surgery is the need for a surgical procedure. [17]
Therefore every implant is unique. As an optimised root-form it is much more than a simple 1:1 replica of a tooth. Since it exactly fills the gap left after the tooth is extracted, surgery is rarely needed. The implant can be produced from a copy of the extracted tooth, an impression of the tooth socket, or from a CT scan or CBCT scan. [7]
The tooth of choice to replace a tooth missing in the anterior maxillary region is the maxillary second premolars. Poor prognosis first permanent molars can be replaced with third molars Autotransplantation has the best outcome in growing patients with some root development complete but incomplete development at the apex.
Archeologists also found gold dental appliances from the Etruscan people of Italy, as early as 630 BCE, interpreting them to be some of the earliest forms of bridges and replacement teeth. Gold wire was used in dentistry in ancient times, [ 3 ] and for filling cavities in the 19th century. [ 4 ]
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Replacement cost (time and financial) Aesthetic; Ease of removal; Marginal integrity; Planned restoration (including change from a crown to a bridge, or adapting the crown design to act as abutment for a partial denture) Access required to treat the tooth safely and effectively (especially with regards to access cavity design)
Restoration replacement: Restorations in abutment teeth with questionable prognosis or old composite resin restorations for adhesive bridgework should be replaced. [ 4 ] Tooth preparation : This should be completed with reference to radiographs and study casts obtained during treatment planning.
In oil field tubing, buttress thread is a pipe thread form designed to provide a tight hydraulic seal. The thread form is similar to that of Acme thread [10] but there are two distinct threaded portions of differing diameters and profiles, the larger having a wedging profile, with a tapered sealing portion in between the larger and smaller diameters.
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