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Bone Regeneration in Implant Dentistry
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Bone Regeneration in Implant Dentistry

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Questions and Answers

What is osseointegration, according to Zarb-1991?

  • A process that leads to asymptomatic rigid fixation of alloplastic materials in bone during functional loading (correct)
  • A process of bone resorption and formation
  • A process of cartilage formation in bone tissue
  • A type of osteogenesis that occurs in the bones of the skull
  • What is the primary mode of osteogenesis in the bones of the skull?

  • Intramembranous ossification (correct)
  • Osseointegration
  • Fibro-osseointegration
  • Endochondral ossification
  • What is the process by which osteogenesis is induced?

  • Osteoinduction (correct)
  • Biomechanical driven distribution
  • Osseointegration
  • Osteoconduction
  • What is the term for the process of cartilage formation and replacement by bone?

    <p>Endochondral ossification</p> Signup and view all the answers

    What type of surface permits bone growth on its surface or down into pores?

    <p>Osteoconductive surface</p> Signup and view all the answers

    What is the ideal condition for titanium implant osseointegration?

    <p>100% coverage by viable bone</p> Signup and view all the answers

    What is the impact of a larger bone-implant contact area on mechanical properties?

    <p>It increases mechanical properties</p> Signup and view all the answers

    What is the term used to describe the direct contact between living bone and implant?

    <p>Osseointegration</p> Signup and view all the answers

    What is the function of bone-graft material in osteoconduction?

    <p>Provide a framework for new bone growth</p> Signup and view all the answers

    What occurs when mesenchymal tissue is directly converted into bone tissue?

    <p>Intramembranous ossification</p> Signup and view all the answers

    What is the term used to describe the process of bone growth on a surface?

    <p>Osteoconduction</p> Signup and view all the answers

    What is fibro-osseointegration?

    <p>A process of fibrous tissue formation at the interphase</p> Signup and view all the answers

    What is the term for the transformation of mesenchymal tissue into bone tissue?

    <p>Osteogenesis</p> Signup and view all the answers

    What is the role of osteoblasts in osteoconduction?

    <p>Spread and create new bone</p> Signup and view all the answers

    Who defined osseointegration in 1981?

    <p>Branemark</p> Signup and view all the answers

    What is the significance of differential fiber orientation interphase at the soft tissue (abutment) compared to natural dentition?

    <p>It affects the soft tissue (abutment) differently than natural dentition</p> Signup and view all the answers

    What percentage of the implant is typically covered by viable bone?

    <p>Less than 100%</p> Signup and view all the answers

    What is the term used to describe the stimulation of primitive cells to develop into bone-forming cells?

    <p>Osteoinduction</p> Signup and view all the answers

    What is the term used to describe the direct anchorage of an implant by the formation of bony tissue?

    <p>Osseointegration</p> Signup and view all the answers

    Who defined osseointegration in 1993?

    <p>Albrektson</p> Signup and view all the answers

    What is the primary consequence of the collapse of the cortical bone wall, especially on the buccal side, after tooth extraction?

    <p>Diminished blood perfusion from the PDL</p> Signup and view all the answers

    What is the name of the bone that provides attachment to PDL fibres?

    <p>Bundle bone</p> Signup and view all the answers

    What is the duration after which the bundle bone is replaced by woven bone?

    <p>2 weeks</p> Signup and view all the answers

    What is the term used to describe the process of bone formation around dental implants?

    <p>Osseointegration</p> Signup and view all the answers

    What is the primary purpose of identifying the Implant Stability Quotient (ISQ)?

    <p>To measure implant stability</p> Signup and view all the answers

    What is the term used to describe the process of bone formation through the action of bioactive molecules?

    <p>Osteoinduction</p> Signup and view all the answers

    What is the primary characteristic of the bone that replaces the bundle bone after 2 weeks?

    <p>It is composed of woven bone</p> Signup and view all the answers

    What is the primary consequence of wound healing contraction after tooth extraction?

    <p>Changes in bone conformation</p> Signup and view all the answers

    What is the term used to describe the process of bone formation through the action of osteoblasts?

    <p>Ostegenesis</p> Signup and view all the answers

    What is the primary purpose of using bone graft substitutes in bone augmentation?

    <p>To replace bone defects</p> Signup and view all the answers

    What is the primary factor influencing the implant stability quotient (ISQ) during resonance frequency analysis?

    <p>Bone density</p> Signup and view all the answers

    What is the minimum ISQ value indicating high stability for implant–bone interface?

    <p>70</p> Signup and view all the answers

    Which of the following is a principle of guided bone regeneration?

    <p>Exclusion of soft tissue cells</p> Signup and view all the answers

    What is the primary disadvantage of titanium reinforced membranes in guided bone regeneration?

    <p>Lack of tissue integration</p> Signup and view all the answers

    What is the typical graft volume range for intra-oral guided bone regeneration?

    <p>5-10 CC</p> Signup and view all the answers

    What is the name of the surface type that promotes bone formation?

    <p>HA-coated surface</p> Signup and view all the answers

    What is the primary advantage of guided bone regeneration in horizontal bone defects?

    <p>Easy management of horizontal bone defects</p> Signup and view all the answers

    What is the term used to describe the analysis of the implant–bone interface during resonance frequency analysis?

    <p>Implant stability quotient</p> Signup and view all the answers

    Which of the following is a type of titanium alloy used in implantation?

    <p>Ti-6Al-4V</p> Signup and view all the answers

    What is the primary purpose of resonance frequency analysis in implantation?

    <p>To determine implant stability</p> Signup and view all the answers

    Study Notes

    Conformational Changes in Alveolar Bone after Tooth Extraction

    • Conformational changes occur in alveolar bone after tooth extraction
    • Collapse of cortical bone wall, especially buccally, composed mainly of bundle bone
    • Diminished blood perfusion from PDL affects the survival of cortical bone
    • Wound healing contraction occurs, resulting in the disappearance of bundle bone and replacement with woven bone (Phase I)
    • Phase 2 involves resorption, which occurs from the outer surfaces of both bone walls

    Implant Supported Prostheses

    • Unitary implant
    • Implant Supported Bridge
    • Implant Supported Hybrid Prosthesis
    • Overdentures

    Biological Process in Bone Formation

    • Osteoinduction: the process by which osteogenesis is induced, stimulating undifferentiated cells to develop into bone-forming cells
    • Osteoconduction: the process by which bone grows on a surface, guiding new bone growth
    • Osseointegration: direct contact between living bone and implant, defined histologically as the direct anchorage of an implant by the formation of bony tissue around the implant without the growth of fibrous tissue at the bone-implant interface
    • Osteogenesis: the development of bones, which can occur through intramembranous ossification (direct conversion of mesenchymal tissue into bone) or endochondral ossification (cartilage intermediate formation and replacement by bone)

    Implant Stability Quotient (ISQ)

    • Measures implant stability as a function of the stiffness of the implant-bone interface
    • Evaluates implant stability at any stage of treatment or follow-up examinations
    • High stability: ISQ >70
    • Influenced by factors such as bone density, jaw healing time, and exposed implant height above the alveolar crest

    Current Strategies to Achieve Bone Augmentation

    • Guided Bone Regeneration (GBR)
      • Principle: exclusion of soft tissue cells, space maintenance, clot stabilization, and bone particles for regeneration
      • Advantages: graft availability, horizontal bone defects
      • Disadvantages: decreased osteoinduction, low predictability in vertical defects, and lack of tissue integration

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    Description

    Quiz on bone regeneration and biomaterials in implant dentistry, covering conformational changes in alveolar bone and implant supported prostheses. For DENT4060 Semester 1 students.

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