Roll forming process is used for manufacturing sheet metal parts by successive bending and creating the final shape with gradual deformation. In this article, deformation of a pre-punched sheet due to the roll forming process was studied. Two main defects in the roll forming process are ovality of holes and bow defect. The ovality of the hole is influenced by the process parameters including sh...

Oral drug delivery is a one of the simplest routes of delivery of drugs for systemic as well as local effect. Liquid oral dosage forms are easy to administer as compared to unit solid dosage forms but sustained effect are not achieved due to less residential time in gastrointestinal tract so,due to this problem In-situ gel used to overcome the problems. The in situ gel dosage form is a liquid b...

We report a divergent and modular protocol for the preparation of acyclic molecular frameworks containing newly created quaternary carbon stereocenters. Central to this approach is a sequence composed of a (1) regioselective and -retentive preparation of allyloxycarbonyl-trapped fully substituted stereodefined amide enolates and of a (2) enantioselective palladium-catalyzed decarboxylative ally...

Although most retention problems of prostheses are concentrated in the mandible, patients have similar problems in the maxillae. Retention of prostheses can be improved by the use of two or four implants, either with retentive anchors or with a bar in the frontal part of the maxillae. The method of planning and placement of I.T.I. Bonefit implants is described.

gastric emptying is a complex and extremely variable process. this causes the unpredictability of the bioavailability of drug delivery systems. gastro retentive drug delivery systems (grdds)s have received significant interest in the past decades as they can overcome the limitation of conventional oral controlled release drug delivery systems related to fast gastric emptying time. an optimum gr...

This investigation examined the relationships of tooth preparation and resin material types in repair of fractured anterior teeth by reattachment of fractured tooth fragments. A total of 44 extracted maxillary central incisors were tested. Statistical analysis revealed that no mechanical preparation of the enamel was as retentive as a 45°-circumferential bevel (p K .01). In addition, light-cure...

objective: there is no definitive data on the strength of glass fiber and cast posts with different length. this in vitro study was designed to investigate and compare the effect of length on the retentive strength of glass fiber and cast posts. materials and methods: sixty recently extracted intact maxillary canine teeth were cut 1mm above the cej. the specimens were endodontically treated and...

Specific deuterated reference compounds were prepared to probe the stereoselectivity of the reductive ring opening of carbohydrate-based benzylidene-type acetals. AlD(3) revealed a retentive stereoselectivity probably through the rare S(N)i (internal nucleophilic substitution) mechanism. An S(N)1-like mechanism occurs in the acid-promoted regioselective BD(3)·THF- or Et(3)SiD-reductive ring ope...

This article described the etched cast restoration. The advantages, disadvantages, indications, contraindications, and technique were discussed. The rationale for modifications in the original framework design and tooth preparation was also presented; some unique advantages over traditional fixed prosthodontics are provided. A retentive framework with maximum coverage is recommended until resea...