Acrylic Injection Research Articles

An anatomical and volumetric study on brain ventricles in sheep using different techniques.

This study investigated the morphological features of the ventricular system of the brain in Akkaraman sheep in a measured and structural manner. In the study, 24 adults male Akkaraman sheep, which is a common and hornless breed were used. Anatomical features of the ventricular system were determined by latex injection and dissection, acrylic injection and corrosion cast and magnetic resonance imaging. In the measurements, a precise digital calliper, Archimedes' principle, Cavalieri's principle and ITK-SNAP imaging were used by comparing them with each other. The average weight of fresh sheep brains was 102 g (0.226 lb), the volume 115.8 mL and the length, height and width were 130.78, 40.58 and 70.08 mm, respectively. The olfactoric bulb contained a cavity associated with the lateral ventricle, large enough to be called a ventricle. The cavity of septum pellucidum has a large cavity was observed. However, there was no cerebrospinal fluid in this cavity. The interventricular foramen of the dissected brain was also an opening measuring 1.4 mm × 3.9 mm × 5.5 mm. The total volume of the ventricles of the brain of Akkaraman sheep was found to be 7107.71 ± 479, 7115 ± 737 and 7080 ± 647 mm3 and 6200 mm3 using the Planimetry, Point Counting method, ITK-SNAP program, and Archimedes' principle, respectively. In the study, species and breed-specific brain indices values and many detailed morphometric data were obtained.

Occlusion of the corpus cavernosum penis in bulls intended for estrus detection: 18 cases (2002-2016).

OBJECTIVE To report surgical and long-term postoperative outcomes of bulls undergoing surgical occlusion of the corpus cavernosum penis (CCP) by acrylic injection and epididymectomy with or without penile fixation as preparation for use in estrus detection. DESIGN Retrospective case series. ANIMALS 18 client-owned bulls. PROCEDURES Medical records of bulls that underwent CCP occlusion between December 2002 and March 2016 were identified. Signalment, surgical data, and reported complications were recorded. Long-term (> 6 months after surgery) follow-up data were obtained from medical records or by telephone interview of bull owners with a questionnaire focused on postoperative outcome, use of the bull for estrus detection, and overall satisfaction with the procedure. RESULTS Intraoperative complications included difficulty isolating the penis, polymerization of the acrylic prior to injection, incomplete anesthesia of the surgical site, and fecal contamination of the site. Deposition of acrylic in an improper location led to urethral obstruction and euthanasia of 1 bull; another developed an abscess that was treated successfully. One bull was euthanized because of orchitis. Most (15/18) bulls were used for estrus detection (mean duration, 17.9 months). Libido was considered good or very good for 14 of 15 bulls; 1 was culled for loss of libido after 14 months. Ten of 12 bulls were reportedly unable to protrude the penis; 2 had or developed partial protrusion ability. Overall client satisfaction was high. CONCLUSIONS AND CLINICAL RELEVANCE In this population of healthy young bulls, CCP occlusion was generally well tolerated. Most bulls that underwent CCP occlusion (and epididymectomy with or without penile fixation) had adequate libido, and none were reported able to achieve intromission.

An injection molding device, improving the existing injection system for acrylic denture fabrication

Introduction: The advantages of injection molding system (IMS) are precise adaptation of acrylic to master cast, continuous compensation of acrylic shrinkage, low porosity and better physical properties of dentures. Traumatic, toxic and allergic complications are reduced. The existing IMS produces only one denture at a time. Using standard capsules leads to waste of material. Removable partial acrylic dentures (RPAD) with wire clasps haven`t been fabricated yet. Materials and methods: The objective is to construct a device for serial injection fabrication of acrylic dentures optimizing both working time and cost of restoration. The device should: provide a precise adaptation of material to master cast reduce residual monomer fabricate a lot of dentures for a short time fabricate RPAD with wire clasps optimize the amount of material A prototype of the device is designed and constructed. Results: The new device is based on the existing IMS. The following improvements are applied: The serial fabrication is achieved by dividing the injection and polymerization process by including a specially designed cap which is fixed on the flask after acrylic injection. It provides continuous pressure during the polymerization process. This allows fabrication of large number of dentures at the same time, injected by a single pneumatic cylinder. RPAD with wire clasps are fabricated by fixing the clasps with cold-cured acrylics and mechanical retention in the master mast. Capsules for multiple fabrication are used. Conclusion: A serial injection of large number of dentures as well as separate processing of each of them is possible at a time. The waste of material is reduced. Fabrication of RPAD with wire clasps is achieved.