Materials Science Quiz: Charpy and Izod Tests

Dental Materials 211 (DMAT211)

• Course Instructor: Dr. Ahmed Magdy Sayed
• Academic year: 2024/2025
• Course offered by: Faculty of Dentistry, Modern University for Technology and Information

Mission and Vision

• Vision: The College of Oral and Dental Medicine - Modern University for Technology and Information aspires to be one of the most distinguished colleges at the local and regional levels in the field of dentistry.
• Mission: The college is committed to preparing dentists who are distinguished by professional merit and are able to comply with the requirements of the labor market and keep pace with scientific development and contribute to it through research activities while meeting the needs of the surrounding community within the framework of ethical values.

Strategic Goals and Objectives

• First Aim: Achieving distinct competitiveness in dental education

  • Objectives:
    • Develop teaching & learning strategies aligning with Egypt's university education development.
    • Enhance program's scientific content, evaluation systems, university book, and student activities to align with labor market needs.
    • Ensure appropriate faculty and staff numbers relative to student numbers.
    • Employ modern learning methodologies and information technology.

• Second Aim: Excellence and creativity in the field of scientific research

  • Objectives:
    • Stimulate scientific research to support local and international community needs.
    • Expand research cooperation locally, regionally and globally.
    • Develop the college's research infrastructure and technology.
    • Ensure ethical scientific research practices and intellectual property rights.
    • Encourage faculty/staff publications and scientific conference participation.
    • Implement postgraduate programs aligning with labor market needs.

• Third Aim: Integration with civil society to provide therapeutic services in dentistry

  • Objectives:
    • Collaborate with community organizations to meet community needs.
    • Provide continuous dental health awareness (locally & internationally).
    • Develop the external clinic's therapeutic services.
    • Support alumni networks and programs.

• Fourth Aim: Institutional excellence and creativity

  • Objectives:
    • Improve infrastructure and technology.
    • Foster capabilities of current and future academic & administrative leaders.
    • Develop capabilities of faculty members, supporting staff and administrators.

Contents

• Structure of Matter (1-11)
• Physical Properties (11-22)
• Mechanical Properties (22-38)
• Principles of Adhesion (38-46)
• Polymers (46- 58)
• Tarnish and Corrosion (73-78)
• Metallurgy (63-72)
• ...

Atomic Structure (From page 6)

• Atoms consist of nucleus & surrounding electrons
• Nucleus contains protons (positive) and neutrons (neutral)
• Electrons are negatively charged and orbit the nucleus in shells
• Valence electrons are outermost electrons that determine chemical and physical properties

Atomic Bonds (From page 7)

• Covalent: Electrons are shared between atoms, determines high strength/hardness, high heat resistance, and insulation properties.
• Ionic: Electrons are transferred, creating ions which attract each other, results in high strength/hardness, high heat resistance, and electrical conductivity in solution.
• Metallic: Loosely held valence electrons form a "cloud" around metal atoms allowing for good heat and electrical conductivity, malleability, and luster.

Chapter I, Structure of Matter

• Includes topics such as Interatomic Distance (IAD), Crystalline Solids (amorphous v crystalline, types of cubic systems: Simple Cubic (SC), Body-centered Cubic (BCC), Face-centered Cubic (FCC), and Hexagonal Closed Packed (HCP)), Atomic Packing Factor, Polymorphism.
• Discusses how factors like temperature, number of adjacent atoms, and type of bonds affect IAD

Chapter II, Physical Properties

• Discusses mass-related properties (density), thermal properties (thermal conductivity, specific heat, thermal diffusivity, coefficient of thermal expansion/contraction, melting/freezing point, heat of fusion), rheological properties (fluidity, viscosity, viscoelasticity), and optical properties (light, reflection, refraction, scattering, transmission, fluorescence, opalescence, and color).

Chapter III, Mechanical Properties

• Includes concepts of force, stress, strain, various types of stress, strain, stress-strain curves.
• Topics like Proportional limit, Elastic limit, Yield strength, Ultimate strength, Fracture strength, Modulus of elasticity, Flexibility, Brittleness, Malleability, Ductility, Resilience, Toughness, Fracture toughness, and related tests like Charpy test and Izod test.

Chapter IV, Principles of Adhesion

• Covers cohesion (bonding similar), adhesion (dissimilar bonding), types (true/mechanical), factors like wetting (contact angle), surface irregularities (improving adhesion), & surface tension of the adhesive, influencing stresses, and importance of cleanliness.

Chapter V, Polymers

• Introduces polymers, their classification (origin, arrangement, thermal behavior, mechanical properties), types of polymers (linear, branched, cross-linked), and polymerization reactions (condensation and addition).
• Explains effects on properties of the polymers, including factors like Molecular Weight (MW) and Degree of Polymerization (DP), crosslinking, plasticizers, and fillers.

Chapter VI, Metallurgy

• Covers the study of metals and alloys. Includes their properties in relation to their structure:
• Different types of alloys (e.g., solid solution, eutectic, intermetallic), methods of shaping metals (casting, cold working, powder metallurgy), and various aspects related to metallurgy and its applications in dentistry.
• Types of Corrosion (galvanic, concentration cell, and crevice) with practical issues arising in the oral cavity, and methods for protection against corrosion

Important Note:

• This summary is a comprehensive overview of the likely content based on the provided pages. The exact details and emphasis may vary depending on the specific curriculum of the course.

Test your knowledge on the Charpy and Izod impact tests, including their differences and applications in materials science. This quiz also explores the significance of permanent deformation in dental materials and the process of micro-mechanical interlocking. Challenge yourself with questions that assess your understanding of these important concepts.