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A case is reported in which the telescoped overdenture was chosen instead of conventional techniques in treatment of a patient's maxillary teeth. The advantages and disadvantages of this technique are discussed.
Determinations of the LET distribution, phi(L), of charged particles within a spacecraft in low-Earth orbit have been made. One method used a cylindrical tissue-equivalent proportional counter (TEPC), with the assumption that for each measured event, lineal energy, y, is equal to LET and thus phi(L) = phi(y). The other was based on the direct measurement of LETs for individual particles using a charged-particle telescope consisting of position-sensitive silicon detectors called RRMD-III. There were differences of up to a factor of 10 between estimates of phi(L) using the two methods on the same mission. This caused estimates of quality factor to vary by a factor of two between the two methods.
PATIENT: A 49-year-old female patient presented to Prosthodontic Clinic at Nihon University School of Dentistry at Matsudo with the chief complaints of chewing difficulty and poor appearance. She was diagnosed moderate to severe periodontitis and partially edentulous dentition on both maxilla and mandible. Occlusal reconstruction was conducted with crown restorations and removable partial dentures (RPD). From the esthetic request of patient, Dimple-bar telescopic (DBT) system was applied to the mandible with bilateral distal coping abutments. DISCUSSION: DBT system has been functioning well for more than 5 years without abutment tooth loss. It was thought that bilateral distal coping abutments can help to resolve problem with bilateral distal extension RPD dilemma. CONCLUSION: It is suggested that DBT system has great potential to resolving weak points of clasps, such as low retentive forces and/or esthetic problem. Furthermore, author got a new understanding of the importance of maintenances.
The charged-particle telescope (CPT) onboard the Clementine spacecraft measured the fluxes of energetic protons emitted in solar energetic particle events. Protons in the energy range from 10 to 80 MeV were of greatest interest for radiation effects such as total dose and single event upsets. Energetic electrons were also of interest for spacecraft charging and their contribution to total dose. The lower-energy CPT electron channels (25-500 keV) were mainly of geophysical interest. While orbiting the moon, the CPT observed the wake created by the moon when it blocked the flow of energetic particles in the magnetotail region. The CPT provided opportunities to observe energetic electron bursts during magnetic storms and magnetospheric substorms. CPT data are particularly useful in multispacecraft studies of interplanetary disturbances and their interaction with the magnetosphere. The proton channels on the CPT provided data on solar energetic protons and storm-time protons associated with the passage of an interplanetary shock at 0903 UT on Feb. 21, 1994. Results are compared with those from GOES-7, SAMPEX, and GEOTAIL.
A telescopic orthosis is described which seems to provide a particularly useful and effective aid during primary rehabilitation in paraplegia.
A model of telescoping is proposed that assumes no systematic errors in dating. Rather, the overestimation of recent occurrences of events is based on the combination of three factors: (1) Retention is greater for recent events; (2) errors in dating, though unbiased, increase linearly with the time since the dated event; and (3) intrusions often occur from events outside the period being asked about, but such intrusions do not come from events that have not yet occurred. In Experiment 1, we found that recall for colloquia fell markedly over a 2-year interval, the magnitude of errors in psychologists' dating of the colloquia increased at a rate of .4 days per day of delay, and the direction of the dating error was toward the middle of the interval. In Experiment 2, the model used the retention function and dating errors from the first study to predict the distribution of the actual dates of colloquia recalled as being within a 5-month period. In Experiment 3, the findings of the first study were replicated with colloquia given by, instead of for, the subjects.
For initial gait training with the paraplegic patient, a lower extremity telescoping orthosis has been developed. This brace eliminates the time-consuming fabrication, considerable weight, and cumbersome use of conventional knee-ankle-foot orthoses and is easily adjustable to a wide range of patients. Particularly during the early phase of rehabilitation, this brace offers significant advantages to the patient with lower extremity disabilities.
For a long time the dental treatment of choice for mentally handicapped patients was extraction of teeth due to the lack of oral hygiene. Recent studies show the possibilities of restorative and prosthodontic treatment even in this group of patients. The records of 58 patients of a psychiatric clinic treated with 84 telescopic overdentures were examined. The highest survival rates after 7 years were in the light mentally retarded group with 86% and the overdentures with 3 anchor teeth with 81%. Schizophrenic patients and overdentures with only one anchor tooth presented only 29% and 37% survival respectively. It can be concluded that the number of anchor teeth and the kind of mental illness should be considered when planning treatment for mentally handicapped patients with overdentures.
A great deal of interest and controversy has arisen about the ability of persons with reduced vision driving with bioptic telescopes. This article is the author's approach to the public. The author has been fitting drivers with bioptic lenses for approximately ten years.
The authors advise, that in subtotal cases the denture retaining primary telescopic crowns should start tapered from the gingival sulcus.
Routine laryngoscopy can be performed easily and quickly utilizing a right-angle telescope with a specially designed holder. In 1,000 consecutive laryngoscopies done on patients without laryngeal symptoms, abnormalities were found in 173 patients (17.3 percent). Among the abnormalities was an asymptomatic carcinoma which, thanks to early detection, was successfully treated by radiation.
PURPOSE: It was the aim of this study to investigate the long-term success of a telescopic crown system that can be used for both rigid and resilient support and to evaluate by means of a literature review whether the use of resilient support may be advantageous compared to other double crown systems when the restoration is placed on only a few remaining teeth. MATERIALS AND METHODS: Patient records were used to evaluate 125 dentures (with 460 abutment teeth) based on the Marburg double crown system. The loss of abutment teeth, endodontic treatment, and fracture of the metallic framework were investigated with regard to the different types of denture support. RESULTS: The probability that a patient would have kept all abutment teeth was 84% after 5 years and 66% after 10 years. No significant differences were found for the two groups "resilient support" (< or = three abutment teeth) and "rigid support" (> or = four abutment teeth). For abutment teeth with a double crown with clearance fit, the risk of loss was 4% after 5 years and 15% after 10 years for rigid support, and 10% and 24%, respectively, for resilient support. The risk of endodontic treatment was 7% after 5 years and 9% after 10 years for rigid support, and 3% and 7%, respectively, for resilient support. None of the denture frameworks showed a fracture during the observation period. CONCLUSION: Removable partial dentures retained by double crowns with clearance fit and constructed without major or minor connectors provide good clinical longevity. The survival rates of abutment teeth were comparable to those reported in the literature for other double crown systems. There was no significant increase of the risk of abutment loss when the restoration was placed on three or fewer remaining teeth and the concept of resilient support was applied.
High spatial resolution continuum radio maps produced by the Westerbork Synthesis Radio Telescope (WSRT) of The Netherlands at frequencies near the 21 cm HI line have been examined for anomalous sources of emmission coincident with the locations of nearby bright stars. From a total of 542 stellar positions investigated, no candidates for radio stars or ETI signals were discovered to formal limits on the minimum detectable signal ranging from 7.7 x 10(-22) W/m2 to 6.4 x 10(-24) W/m2. This preliminary study has verified that data collected by radio astronomers at large synthesis arrays can profitably be analysed for SETI signals (in a non-interfering manner) provided only that the data are available in the form of a more or less standard two dimensional map format.
Double crown-retained prostheses have been successfully used in partially edentulous patients. This type of retainer provides guidance, support, and protection from dislodging movement, and it transfers bite forces along the long axis of the abutment teeth. Furthermore, the denture can easily be retrieved when an abutment needs to be extracted. By modifying the preparation and veneering technique, overcontour of the double crowns can be minimized. Using custom-made all-ceramic crowns as prosthesis teeth and individualizing the denture base, esthetics can be improved. Longitudinal follow-up studies of 5 to 10 years report that conical crown-retained partial dentures have a lower failure rate compared to those retained with clasps or precision attachments. In a case report, clinical and technical aspects of constructing telescopic crown-retained removable partial dentures are discussed.
OBJECTIVE: To investigate the influence of bone height around the roots on stress distribution in a mandible with two canines remained and covered with an telescopic overdenture. METHODS: Three-dimensional finite element method. RESULTS: As the height of the bone around the roots decreased, the stress increased. But the maximum stress in the bone in this study is lower than that in the bone around the canine under normal condition. CONCLUSION: In the mandible, when the alveolar bone resorption reaches the apical 1/3 of canine (root length 4, 5 mm), if part of the tooth crown was removed, to make an acceptable crown/root ratio, so the canine can be used as the abutment of an overdenture.
Solving maintenance problems on older prostheses is a constant challenge. Many times, the clinician is faced with recurrent decay around an abutment of a fixed restoration. It is not always feasible to redo the entire restoration. This article shows the clinician how to fabricate an esthetic telescope over the decayed abutment while preserving the existing fixed restoration.
The implantable miniaturized telescope (IMT) is the first intraocular magnifying system proposed for optical correction in patients with age-related macular degeneration (ARMD). The optical component is embedded in a carrying device designed as an intraocular lens that is implanted after cataract surgery. In this study, we report findings on an IMT that was explanted because of aqueous infiltration into its optic and describe the configuration of this device and the surgical technique required for its implantation. The patient, a 75-year-old male with bilateral cataract and nonexudative ARMD, underwent phacoemulsification with implantation of an IMT in the right eye. The rigid device, weighing 46.1 mg in aqueous, has an overall diameter of 13.5 mm and requires implantation through a large limbal incision. It is fixated at the 6 to 12 o'clock meridian. Follow-up examination revealed the presence of numerous droplets inside the IMT optic. The device was explanted and sent to our center for evaluation. A large fissure was found on the carrying device. However, it was unlikely the site for aqueous infiltration. Microdefects at the level of the sealing of the optical cylinder appeared to provide the opening for the inflow of aqueous that formed droplets. Based on the findings of this report the manufacturer has modified the sealing technique to avoid this complication. Current clinical trials are now ongoing to assess the efficacy of this device in providing visual rehabilitation for ARMD patients.
OBJECTIVE: We investigated the mechanical and in vivo properties of a novel device, called the telescopic plate spacer (TPS), designed to promote restoration of height, alignment, and stability after cervical corpectomy for tumor. METHODS: The device first underwent mechanical testing. Comparisons were made with a commercially available anterior cervical plate. A caprine study was then performed. Twelve goats underwent a cervical corpectomy and placement of either a TPS filled with autograft or a plate and autograft. The animals were killed at 28 weeks and assessed for fusion. A prospective human study was then conducted. Fifteen patients with cervical or cervicothoracic tumors underwent corpectomy and placement of allograft-filled TPS. End points included pain scores and radiographic assessment of vertebral height, alignment, and stability. RESULTS: In the mechanical study, the TPS outperformed the anterior cervical plate in all modalities except for torsion stiffness and tension-bending failure load. The caprine study demonstrated fusion in six of six cases at 28 weeks in the TPS group, compared with four of six cases in the plate and autograft group. In the human study, patients (n = 15) were stabilized with the TPS after corpectomy (range, 1-3 levels; average, 1.7 levels). There were no failures of instrumentation or neurological deterioration. Stability was achieved in all patients, with an average follow-up of 9 months. Durable improvements in pain scores (P = 0.001), vertebral height (P = 0.002), and reduction of kyphosis (P = 0.046) were achieved. CONCLUSION: The TPS can be used to restore height, alignment, and stability after corpectomy.