Abstract: An apparatus for determining a projection angle of dental periapical radiography includes a body, an angle measuring member, an imaging locator and a projection indicator. The body is a circular cylinder, and the angle measuring member is provided on a top or bottom surface of the body. The imaging locator is detachably coupled to the body, and the projection indicator is pivotally coupled to the body. It operates based on a protractor-assisted projection technique and can avoid ambiguities associated with the angle-bisecting projection technique and operating difficulties associated with the paralleling projection technique. Moreover, it can reduce imaging repetitions and can be easily applied to teaching and professional education due to its ease of understanding and implementation.

Abstract: A collimator for a dental X-ray imaging apparatus, including: a housing (3) having a first end and a second end, which oppose each other, the first end provided thereat with a light exit aperture, the second end secured to the dental X-ray imaging apparatus so as to define a light passage so that X-rays are able to travel through the light passage and exit from the light exit aperture; a securing means disposed at the second end, with which the housing (3) is detachably secured to a beam-limiting cone (10); a visible light source (12) placed within the housing (3) and configured to be able to emit visible light; a window member disposed at the first end of the housing and configured to allow visible light and X-rays to transmit therethrough and be projected and irradiated onto an object to be imaged; a light-reflecting plate (13) placed in the housing (3) obliquely with respect to a longitudinal axis of the light passage and configured to be able to reflect visible light emitted from the visible light source

Abstract: A visible light projection indicator for a dental x-ray imaging apparatus, including a casing (2), one end of the casing (2) detachably affixed to a beam-limiting cone (3) in the dental x-ray imaging apparatus, the other end thereof provided with a light exit aperture; a visible light source (1) positioned in the casing (2) and configured to be able to emit visible light; the casing (2) affixed to the beam-limiting cone (3) so as to form a light passage so that visible light emitted from the visible light source (1) is able to travel along the light passage and exits from the light exit aperture.

Abstract: A dental imaging teaching apparatus includes a light source, a tooth model and an imaging plate. The light source is configured to emit visible light, and the tooth model is at least partially transparent to visible light. The imaging plate is provided with graduations in the form of a grid. The tooth model includes a plurality of nodes and connections. The plurality of nodes is connected by the connections, forming a mesh. This dental imaging teaching apparatus avoids the ambiguities and operating difficulties associated with the conventional X-ray projection techniques, enhances radiography technology and reduces imaging repetitions, effectively reducing a patient's unnecessary exposure to the harmful radiation due to such repetitions. Moreover, it can be easily applied to teaching and professional education, and as the first periapical projection teaching apparatus, it improves the theoretical system of periapical projection technology for oral and maxillofacial imaging for medical use.

Abstract: An apparatus for determining a projection angle of dental periapical radiography includes a body, an angle measuring member, an imaging locator and a projection indicator. The body is a circular cylinder, and the angle measuring member is provided on a top or bottom surface of the body. The imaging locator is detachably coupled to the body, and the projection indicator is pivotally coupled to the body. It operates based on a protractor-assisted projection technique and can avoid ambiguities associated with the angle-bisecting projection technique and operating difficulties associated with the paralleling projection technique. Moreover, it can reduce imaging repetitions and can be easily applied to teaching and professional education due to its ease of understanding and implementation.

Abstract: A collimator for a dental X-ray imaging apparatus, including: a housing (3) having a first end and a second end, which oppose each other, the first end provided thereat with a light exit aperture, the second end secured to the dental X-ray imaging apparatus so as to define a light passage so that X-rays are able to travel through the light passage and exit from the light exit aperture; a securing means disposed at the second end, with which the housing (3) is detachably secured to a beam-limiting cone (10); a visible light source (12) placed within the housing (3) and configured to be able to emit visible light; a window member disposed at the first end of the housing and configured to allow visible light and X-rays to transmit therethrough and be projected and irradiated onto an object to be imaged; a light-reflecting plate (13) placed in the housing (3) obliquely with respect to a longitudinal axis of the light passage and configured to be able to reflect visible light emitted from the visible light source

Abstract: A visible light projection indicator for a dental x-ray imaging apparatus, including a casing (2), one end of the casing (2) detachably affixed to a beam-limiting cone (3) in the dental x-ray imaging apparatus, the other end thereof provided with a light exit aperture; a visible light source (1) positioned in the casing (2) and configured to be able to emit visible light; the casing (2) affixed to the beam-limiting cone (3) so as to form a light passage so that visible light emitted from the visible light source (1) is able to travel along the light passage and exits from the light exit aperture.