Abstract: This invention discloses a crack-free and low-cost detection element for determining an oxygen content and a detector for determining an oxygen content using the element. The element comprises a ceramic tubular body, an ion-conductive ceramic bowllike closing member fixed to the opening end of the tubular body in such manner that the opening end of the closing member may not be inserted into the opening of the tubular body, and an inner and an outer electrode respectively mounted on the inside and the outside surface of the bowllike closing member.

Abstract: This invention is directed to a burnt ceramics composition of matter for an endosseous implant to be inserted in the bone tissue of a living body. The composition of matter consists of 95-50% of Al.sub.2 O.sub.3 and 5-50% of more than one compound selected from the group consisting of ZrO.sub.2, La.sub.2 O.sub.3 and Y.sub.2 O.sub.3.

Abstract: The disclosure relates to a ceramic heating device in the form of a cylindrical shape comprising a burnt cylindrical support core of heat-resistant ceramics, a ceramic element disposed around said support core, said element comprising (i) a burnt sheet of heat-resistant ceramics; (ii) a heat-generating resistor pattern, said pattern being hermetically sealed between said sheet; and (iii) a pair of exposed terminals provided onto said sheet and said core, said terminal being connected to said pattern and adapted to be coupled to power leads such that electric power is then applied to said pattern.