ABSTRACT
This article will address the evolution of occlusal disease from childhood and the deciduous dentition forward. It will include the evolution of anterior wear with emphasis on "cross over" of the mandible. Having classified the types and extent of occlusal disease, new evidence will be shown, on the adult dentition with pathognomonic manifestations, of cross-over or bruxed-braced occlusal disease. Its potential effect on restorative dentistry and dental implants will be discussed.
Subject(s)
Malocclusion/physiopathology , Adult , Aged , Bruxism/complications , Bruxism/diagnosis , Bruxism/physiopathology , Child , Child, Preschool , Dental Implants , Dental Restoration, Permanent , Female , Humans , Male , Malocclusion/classification , Malocclusion/etiology , Patient Care Planning , Tooth Abrasion/etiology , Tooth, Deciduous/pathologyABSTRACT
In part I of this article, the evolution of bruxism from childhood was discussed. Further, the different types of anterior tooth wear were reviewed. Specifically, the type of wear noted in bruxed-braced or cross-over position was pointed out. Examples were illustrated to allow the practitioner to recognize the type of parafunction in advance of treatment. This article will continue the discussion of cross over with moderate to extreme examples. Suggestions for treatment are discussed depending on the severity of the problem. Restorative failure and the implications for implant dentistry are noted.
Subject(s)
Bruxism/complications , Malocclusion/etiology , Tooth Abrasion/etiology , Adolescent , Bruxism/physiopathology , Bruxism/prevention & control , Child , Dental Implants , Dental Restoration Failure , Dental Restoration, Permanent , Female , Humans , Male , Malocclusion/therapy , Middle Aged , Occlusal Adjustment , Occlusal Splints , Orthodontic Appliance Design , Tooth Abrasion/therapySubject(s)
Dentistry, Operative/classification , Adult , Dental Occlusion , Dentures , Female , Humans , Male , Middle Aged , Periodontal Diseases/diagnosis , Tooth Diseases/diagnosisABSTRACT
Accurate electromechanical gauging of steep aspheric profiles is often complicated by the complexity of the elationship between the locus of the probe tip center of curvature and the probe tip/asphere contact point. Solving for the contact point is usually done in an iterative manner, which is a fairly laborious computing chore. But since a considerable amount of sag information is conventionally produced by the lens design program generating the aspheric surface, it is possible to shortcut the process by using these data to solve directly for the probe tip coordinates as a function of the aspheric prescription.
ABSTRACT
Transmission measurements were made on samples of acrylic, polystyrene, styrene-acrylic copolymer (N.A.S.), polymethyl pentene (TPX), polysulfone, polycarbonate, and Trogamid; molded windows of 5.08-mm thickness were measured over the range 0.4-40.0 microm. All these injection-moldable materials appear to be usable in the visible region, and have surprisingly similar transmission profiles from 1.0 microm to 2.0 microm. Polystyrene and TPX possess several potentially useful transmission windows in the middle-wavelength and long-wavelength infrared regions, particularly TPX. The potential of these materials as substitutes for expensive crystalline materials in infrared application is discussed. The possibility that other thermoplastic materials may offer similar opportunities is also presented.
Subject(s)
Periodontal Diseases/therapy , Periodontal Prosthesis , Humans , Patient Care Planning , Tooth MobilityABSTRACT
The optical elements of a cassegrainian telescope are commonly tested individually, with their axes in a horizontal position. When these optical elements are inserted in the telescope, the resulting imagery is often disappointing. The quality of the imagery in the telescope may be predicted more accurately if the primary and secondary mirrors, with their axes in the vertical position, are tested against each other with the aid of null compensating reimaging optics. An example is given to illustrate the application of the technique.
