Dentures - If you have them

Japanese: 入歯 - いれば

Also called dentures. Artificial teeth to replace missing teeth. Made of metal, plastic, porcelain, etc., they are used for functional and sometimes cosmetic purposes. In the narrow sense, there are two types: removable dentures and bridge dentures. In the broad sense, they are called prostheses, and include metal crowns and continuation teeth to restore partially missing teeth. (1) Metal crowns. These are used to artificially restore crowns that have been lost due to decay or trauma to the point that filling is not possible, and are made of gold alloys, gold-palladium-silver alloys, nickel-chromium alloys, etc. These are not often used on the front teeth these days. (2) Continuation teeth. Also called sequelae. When the crown is severely damaged, these are used to connect to the artificial crown, using the tooth root as an abutment. Made of porcelain, plastic, etc. Used on the front teeth. (3) Bridges. Also called bridge dentures. Dentures that are placed over adjacent teeth like a bridge to support artificial teeth. Compared to dentures with plates, in which the force of occlusion is borne by the gums, dentures with plates have less of a foreign body sensation and are better for chewing ability, but they place a greater burden on the abutment teeth. They are made from the same materials as metal crowns. (4) Dentures with plates. Partial dentures, used when one or more teeth are missing, consist of artificial teeth, a denture base, and hooks to prevent the dentures from falling out. Complete dentures, which replace all teeth, consist of dentures and a denture base. In both cases, the artificial teeth are made of porcelain or plastic, and the denture base is made of plastic or various metal alloys.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

義歯とも。欠損した歯を補う人工歯。金属，プラスチック，陶材などを用い，機能上，時に美容上の目的で行われる。狭義には有床義歯と橋義歯（ブリッジ）の２種。広義には補綴(ほてつ)といって，一部欠損した歯を修復する金属冠や継続歯も含まれる。（１）金属冠。虫歯や外傷で充填(じゅうてん)では不可能なほど欠損した歯冠を人工的に修復するもので，金合金，金パラジウム銀合金，ニッケルクロム合金などで作る。最近は前歯部にはあまり用いない。（２）継続歯。つぎ歯とも。歯冠がひどくおかされている時，歯根を支台にして人工歯冠と継続するもの。陶材，プラスチックなどで作る。前歯部に用いる。（３）ブリッジ。橋義歯とも。人工歯を支持するため橋のように隣接する歯にかけ渡した義歯。咬合(こうごう)力を歯肉で負担する有床義歯に比して異物感が少なく咀嚼(そしゃく)能力もすぐれるが，橋脚歯の負担が大きい。材料は金属冠と同じ。（４）有床義歯。１〜数歯が欠損した時の部分床義歯は人工歯，義歯床，義歯の抜けるのを防ぐ鉤(かぎ)からなる。全歯を補う全部床義歯（総義歯）は義歯と義歯床とからなる。いずれも人工歯は陶材，プラスチック，義歯床にはプラスチック，各種金属合金を用いる。

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