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At least 1,495 records · Page 83Linked to original sources
PubMed1999

Accuracy of integration of dental casts in three-dimensional models.

PURPOSE: This study investigated errors occurring in three-dimensional (3D) models when plaster dental casts are integrated into them. MATERIALS AND METHODS: Three-dimensional milling models of three patients with a jaw deformity were fabricated using the Endoplan system (SPARC International Inc, Santa Clara, CA). After this, plaster dental casts were integrated into the 3D models using a face-bow transfer system. Two cephalograms were then compared, one obtained from the patient and the other obtained from the 3D model painted with contrast medium. RESULTS: In two cases, the reproducibility of the dental position as determined by angle analysis was within 2 degrees, and that determined by distance analysis was within 2 mm. However, errors over 4 degrees and 4.2 mm, respectively, were observed in one case. CONCLUSION: It is clinically important to confirm the accuracy of the 3D model by cephalometric analysis, and it may be necessary to reposition the dental model based on the results.

Adult↗
PubMed1995

Early mobilization in the treatment of Colles' fracture: a 3 year prospective study.

Ninety consecutive women with unilateral Colles' fractures were randomized into two different treatment groups. The control group was treated for 5 weeks in conventional short-arm, below the elbow plaster of Paris casts. The other group (N = 45) was treated similarly in plaster casts for 3 weeks and then had flexible casting applied for the remaining 2 weeks which allowed for early joint mobilization. Functional recovery was assessed by measuring grip strength and joint mobility at intervals over the 3 years. Radiographic and overall assessments were also made during 3 year course of study. Virtually all patients reported greater comfort after switching to the flexible casting. Mean grip scores and joint mobilities were higher at all time points with early mobilization, reaching levels of statistical significance at 6 months for grip score and at 3 months for joint mobility. By 3 years most differences between treatment groups had resolved. We found no evidence that early mobilization was detrimental to recovery. We conclude that early mobilization is a satisfactory treatment option for Colles' fracture, and may, in fact, hasten functional recovery.

Adult↗
PubMed1989

Osteopenia after ankle fractures. The influence of early weight bearing and muscle activity.

Fifty-seven patients surgically treated for ankle fractures were followed for two years with bone mineral content (BMC) estimations at various levels of both lower extremities. Maximum BMC reduction was seen four months after operation. Bone mineral was partly regenerated during the remainder of the first year. There was hardly any regeneration during the second year. The persisting bone mineral deficit was between 3.5% and 9% depending on the region measured. BMC changes were minor in the contralateral limb and mainly consisted of a slight gain. During the first six postoperative weeks, patients (1) performed active movements of the ankle and subtalar joints but did not bear weight; (2) wore a plaster of paris cast without bearing weight; or (3) bore full weight in a plaster cast. The bone mineral loss was similar in the three treatment groups.

Adult↗
PubMed1996

Parent satisfaction comparing two bandage materials used during serial casting in infants.

Plaster of Paris was compared with semirigid fiberglass casting material during serial casting in 17 infants with clubfoot or rigid metatarsus adductus. Semirigid fiberglass was statistically superior in its durability, convenience, performance, and ease of removal. The average amount of time for home cast removal by the parents was 55 minutes for plaster of Paris and 21 minutes for semirigid fiberglass. Complications such as skin abrasions and cast slip-off were similar for both casting materials. Ninety-four percent of parents strongly preferred semirigid fiberglass rather than plaster of Paris for their child's serial casting.

Casts, Surgical↗
PubMedDate not supplied

Plaster of Paris: the forgotten hand splinting material.

This article examines the concept of tissue adaptation in response to the application of plaster of Paris splints and casts. A review of the history of plaster of Paris and its composition, its working properties, and precautions for its use introduces the reader to this oft-forgotten material. Four designs are described for plaster of Paris application-circumferential padded casts, digital unpadded casts, plaster slabs, and contour molds. The discussion of clinical application of plaster of Paris covers joint tightness, arthritis, contracted joints due to spasticity, muscle-tendon tightness, skin tightness, skin and joint tightness, and edema reduction. In addition, a new application called casting motion to mobilize stiffness (CMMS), developed by the author, is discussed. The use of plaster of Paris to improve postoperative flexor tendon glide is also discussed. This review article intends to stimulate the reader to use plaster of Paris splinting or casting more frequently to solve clinical problems.

Calcium Sulfate↗
PubMed2001

Fit of implant-supported fixed prostheses fabricated on master casts made from a dental stone and a dental plaster.

STATEMENT OF PROBLEM: The impression and cast on which an implant-supported fixed prosthesis is fabricated must accurately reproduce the intraoral relations. PURPOSE: The fit of fixed prostheses fabricated on master casts poured in a conventional die stone and in an ultra-low-expansion plaster was investigated in vitro. MATERIAL AND METHODS: An impression was made of patient replicas with inter-implant abutment distances of 50 and 35 mm. Ten master casts were poured in a conventional die stone (Velmix, Kerr) and 10 in an ultra-low-expansion plaster (Gnathostone, Zeus). A simulated plaster fixed prosthesis was fabricated on each master cast and then returned in a random order to the appropriate patient replica. The fixed prostheses were screwed into place on one abutment with a torque of 10 Ncm. Vertical discrepancies were measured at the other abutment by an operator blinded to the cast on which the fixed prosthesis was fabricated. A 2-way analysis of variance was performed for distance and materials, and significant differences were identified with regression analysis. RESULTS: For the 50-mm inter-abutment distance, die stone master casts produced a mean vertical discrepancy of 80 microm (SD 32.50 microm). Plaster master casts produced a mean vertical discrepancy of 42.8 microm (SD 12.17 microm). The means were significantly different (P=.01). For the 35-mm inter-abutment distance, the mean vertical discrepancy produced from the die stone and plaster master casts was 84.33 microm (SD 49.9 microm) and 0 microm (SD 0), respectively. The means were significantly different (P<.001). A significant difference was found between the mean vertical seating discrepancies of fixed prostheses produced from plaster casts with inter-abutment differences of 50 mm and plaster casts with inter-abutment distances of 35 mm (P=.003). No significant differences were found between mean vertical seating discrepancies for fixed prostheses fabricated on die stone casts. CONCLUSION: In this in vitro study, master casts poured in an ultra-low-expansion plaster limited to a maximum inter-abutment dimension of 35 mm were more accurate than casts with 50-mm inter-abutment spans or those poured in a conventional die stone.

Analysis of Variance↗
PubMed1982

[The cushion ability of lining materials for the setting and heating expansion of plaster bonded investment in casting ring. Part I: For casting mold cavity of inlay type (author's transl)].

We measured the dimensional change of mold cavity in casting ring and casting accuracy for inlay type casting using two kinds of lining materials in various conditions. These lining materials were asbestos ribbon and ceramic fiber. In the comparison of cushion ability for the expansion of investment in casting ring of these two lining materials, following results were obtained. 1. Compressibility of ceramic fiber was twice as much as asbestos. And, two sheets of ceramic fiber ribbons had enough ability for free expansion of investment in casting ring. 2. More than two sheets of asbestos ribbons in dry state had the ability of compensation for casting shrinkage in heating process. 3. Asbestos ribbon in wet state made a setting expansion of investment larger, but had not any ability of cushion for heating expansion of investment. 4. If the cushion ability of lining materials was not enough, the mold cavity shrank. The order of this shrinking inclination were no lining material state, two sheets, one sheet of wet asbestos, and one sheet of dry asbestos. 5. This shrinking inclination of smaller cavity was greater than that of larger cavity. That meant that the larger thickness of investment in ring made this shrinking inclination greater. 6. In case of without mold cavity, the heating expansion of the investment toward the casting ring were same value at any position in casting ring.

Chemical Phenomena↗
PubMed1989

[Differentiated therapy of distal radius fracture].

The fracture of the distal radius loco typico is one of the most frequently occurring fractures. This article presents types of fractures, in particular Colles', Smith's, Barton's and multiple-fragment's fractures. Conservative and operative treatment is described, as well as problems related to the different procedures. Besides fracture retention by plaster splint or cast, Besides fracture retention by plaster splint or cast, transcutaneous osteosynthesis by Kirschner wire, lag screws, osteosynthesis by buttress plate and the use of the external fixator are described as examples of operative therapeutics.

Bone Nails↗