Biomaterial Database

Effects of porcelain-metal junction angulation on porcelain fracture. 1985

J A Woods, and E Cavazos

The different porcelain-metal junction angulations from 45 to 135 degrees have no effect on the amount of compressive force required to fracture the porcelain. The compressive force required to fracture the samples was reduced by half when the contacts were placed 1 or 2 mm from the porcelain-metal junction. Nevertheless, even at 2 mm from the porcelain-metal junction, the compressive strength was approximately six times that of the average biting force. Therefore, clinical fractures are not the result of biting force but possibly the burnishing effect on the metal as the patient slides through the junction. An experiment designed to study a sliding force on the porcelain-metal junction is needed to understand the causes of fracture that originate there and to determine an optimum distance for the placement of occlusal contacts.

UI	MeSH Term	Description	Entries
D001732	Bite Force	The force applied by the masticatory muscles in dental occlusion.	Masticatory Force,Occlusal Force,Bite Forces,Force, Bite,Force, Masticatory,Force, Occlusal,Forces, Bite,Forces, Masticatory,Forces, Occlusal,Masticatory Forces,Occlusal Forces
D003722	Dental Alloys	A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions for use in restorative or prosthetic dentistry.	Alloy, Dental,Alloys, Dental,Dental Alloy
D003776	Dental Porcelain	A type of porcelain used in dental restorations, either jacket crowns or inlays, artificial teeth, or metal-ceramic crowns. It is essentially a mixture of particles of feldspar and quartz, the feldspar melting first and providing a glass matrix for the quartz. Dental porcelain is produced by mixing ceramic powder (a mixture of quartz, kaolin, pigments, opacifiers, a suitable flux, and other substances) with distilled water. (From Jablonski's Dictionary of Dentistry, 1992)	Porcelain,Porcelain, Dental,Dental Porcelains,Porcelains,Porcelains, Dental
D003779	Denture Design	The plan, delineation, and location of actual structural elements of dentures. The design can relate to retainers, stress-breakers, occlusal rests, flanges, framework, lingual or palatal bars, reciprocal arms, etc.	Denture Designs,Design, Denture,Designs, Denture
D013314	Stress, Mechanical	A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area.	Mechanical Stress,Mechanical Stresses,Stresses, Mechanical
D013499	Surface Properties	Characteristics or attributes of the outer boundaries of objects, including molecules.	Properties, Surface,Property, Surface,Surface Property