It is known that the only finite topological spaces that are Hspaces are the discrete spaces. For a finite poset which is weakly equivalent to an H-space, a generalized multiplication may be found after suitable subdivision. In this paper we construct minimal models of the k-fold generalised multiplications of circles in the category of relational structures, including poset models. In particul...

At Studio A, a supported studio for neurodiverse artists, the prolific painter, performer, photocopier, and installation artist Thom Roberts frequently reaches out to connect with friends fellow artists by running his hands across backs of their heads; “reading” crowns. It’s blessing I have been lucky enough receive countless times over course my ethnographic engagement as relationship has deve...

statement of problem: targis restorations provide good esthetic and clinical success; however, improving marginal accuracy requires further investigations. purpose: the aim of this was to study evaluate the effect of relining on the marginal accuracy of ceromer crowns. material and methods: one ivorine maxillary central incisor was prepared for targis crown. 10 acrylic models were duplicated fr...

The preformed metal crown was first introduced in 1950, made of stainless steel it was referred to by an acronym of SSC. However soon the metal used was changed to nickel-chromium and these days it is best referred to as a preformed metal crown (PMC). I first encountered them in 1965 as a travelling extern in paedodontics in the backwoods of British Columbia (Canada). Not having been taught the...

also often required even in the posterior region. However, all-ceramic crowns pose some problems, including weak mechanieal properties and occurrence of cracks or pores in the erown that could ultimately lead to fracture oi' the restorationii'. Thus far, all-ceramic crowns have been fabricated by firing porcelain manuaNy onto a refractory die, or by casting or heat-pressing the cerarnics. Howev...

A female presented to the office with a chief complaint concerning the esthetics of the porcelain-fused-to-metal (PFM) crowns on her maxillary lateral incisors. The objective was to use contemporary materials and techniques to have them blend better with her natural dentition. The PFM crowns had been completed at different times during her life. She said they did not match each other or her adj...

Decorative crowns for the teeth have gained a resurgence of popularity among adolescents. Similar to other forms of body art found in the mouth, these trendy crowns may be associated with a variety of oral complications. This case report describes a localized form of necrotizing ulcerative gingivitis, exacerbated by a cosmetic gold crown in a teenage girl. Healthier artistic options are discuss...

amelogenesis imperfecta is a heterogeneous group of hereditary disorders. its treatment continues throughout the patients' childhood and adolescence and consists of advanced restorative care in severe cases. a thorough prosthodontic treatment plan including orthognatic surgery, full veneer crowns and all ceramic anterior crowns is presented in this clinical report.