this study was carried out to determine some mechanical properties of barley seed including deformation, rapture force, rapture energy and toughness as a function of moisture content (10.5%, 12.5%, 14.5% , 16.5%, db), loading rate (5, 15, 25, 35 mm.min-1) and grain size (small, medium, large). tests were performed at 7 replications by the means of a factorial base plot experiment. the results s...

deformation length is one of the most important parameters in cold roll-forming process, which plays a fundamental role in determining the inter-distance between the stations and rate of deformation. deformation length was first introduced by bhattacharyya. he also obtained a closed-form relation for this length in roll-forming of symmetric channel section. in this paper, deformation length in ...

An impacted left mandibular second molar (tooth 37) was extracted, but most of its dental follicle remained in the socket. The crown and dental papilla of an unerupted, left mandibular third molar (tooth 38) were then placed into the socket of tooth 37. Successful interaction between the dental follicle of tooth 37 and the crown and dental papilla of tooth 38 led to the formation of a new tooth...

  Objective: Microbial plaque is among the main etiologies of periodontal disease, and tooth brushing with toothpaste is the most commonly used method of plaque control. This study aimed to compare the efficacy of tooth brushing with and without three different dentifrices.   Methods: Thirty dental students were randomly selected to participate in this clinical trial and were asked to refrain f...

INTRODUCTION The aim of this study was to investigate the variation in the amount of the orthodontically induced tooth movement in humans and potential associations between the amount of tooth movement with age and location in the mandible or maxilla. SUBJECTS AND METHODS This study included 11 participants (7 females, 4 males) with an age range of 11.3-28.6 years. In a standardized experimen...

OBJECTIVE This study was intended to optimize perlite particle size and morphology for better tooth cleaning and lower tooth abrasion, and to evaluate the performance of a whitening toothpaste containing the optimized perlite abrasive for tooth cleaning, abrasion, and polishing. METHODS Perlite toothpaste abrasive samples were prepared by air classifying a commercial expanded perlite product....

OBJECTIVE The aim of this study was to present a literature review and case series report of tooth abnormalities in congenital infiltrating lipomatosis of the face (CIL-F). METHODS Four typical cases of CIL-F are presented. Tooth abnormalities in CIL-F documented in the English literature are also reviewed. The clinical and radiological features of tooth abnormalities are summarized. RESULT...

Objectives: To investigate, by an in vitro study, the fracture strength of root-filled teeth restored with polyetheretherketone (PEEK) full-coverage crowns.Materials and Methods: Two single-rooted maxillary second premolar Typodont were prepared according to standardized preparation guidelines for two different crown restorations: computer-aided design/computer-aided manufacturing monolithic li...

To reveal the nonlinear dynamic behavior of gear rattling vibration caused by backlash, a 2-DOF oscillator model with spring and damping elements was established. Based on theory discontinuous dynamical systems, phase plane motion divided into three parts: domain tooth surface meshing motion, free back motion. Introducing global mapping local dynamics method, process teeth from impact to then a...