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Related Concept Videos

Methods of Controlling Food Spoilage01:26

Methods of Controlling Food Spoilage

Food spoilage is caused by microbial growth or by chemical and physical changes, all of which affect the taste, texture, and safety of food.Temperature-Based PreservationRefrigeration at 0–4 °C slows microbial growth and enzyme activity, making it ideal for short-term storage. However, certain spoilage organisms—such as psychrotrophs like Listeria monocytogenes—can still proliferate at these temperatures. Freezing below -18 °C further slows biological processes by forming ice crystals, which...
Pasteurization and Food Preservation01:28

Pasteurization and Food Preservation

Pasteurization is a widely employed thermal processing technique designed to enhance the safety and shelf life of perishable food and beverages. By subjecting products to specific high temperatures for controlled durations, this method effectively inactivates pathogenic microorganisms and spoilage enzymes without significantly compromising sensory qualities. The technique has been pivotal in food safety management, especially for consumables susceptible to microbial contamination such as milk,...
Principles of Food Preservation01:27

Principles of Food Preservation

Food spoilage results from microbial growth, enzymatic activity, and environmental factors that gradually degrade the sensory, nutritional, and safety qualities of food. Preservation techniques aim to slow or halt these processes to extend shelf life and maintain product quality.A key concept in food microbiology is the microbial growth curve, which includes four phases: lag, exponential (log), stationary, and death. During the lag phase, bacteria adjust to their environment without significant...
Frost Action on Concrete01:27

Frost Action on Concrete

Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
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Effects of Creep01:25

Effects of Creep

Creep in concrete, the gradual deformation under prolonged stress, significantly impacts the integrity of structures. For reinforced concrete beams, it can be a vital design consideration, as it increases deflection, sometimes necessitating additional design measures. In columns, especially slender ones under eccentric loads, creep can cause buckling, compromising their stability. However, creep can be beneficial in indeterminate structures by mitigating stresses that arise from shrinkage,...
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Ridge preservation: does it actually work?

Ivan Darby1

  • 1Melbourne Dental School, University of Melbourne. idarby@unimelb.edu.au

Annals of the Royal Australasian College of Dental Surgeons
|November 4, 2011
PubMed
Summary
This summary is machine-generated.

Ridge preservation techniques aim to minimize alveolar bone loss after tooth extraction. While some bone fill occurs, evidence is lacking to confirm long-term benefits for implant success or 3-D placement.

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Area of Science:

  • Dentistry
  • Oral Surgery
  • Periodontology

Background:

  • Tooth extraction leads to alveolar ridge dimensional changes (height and width reduction).
  • Alveolar ridge reduction poses challenges for restorative therapies like crowns, bridges, and dental implants.
  • Ridge preservation aims to mitigate post-extraction bone loss using grafts and/or membranes.

Purpose of the Study:

  • To review the effectiveness of various ridge preservation methods.
  • To assess the impact of ridge preservation on hard and soft tissue volume and implant outcomes.
  • To evaluate the long-term success and survival rates of implants placed in preserved sockets.

Main Methods:

  • Review of studies utilizing autogenous, allogenic, and alloplastic graft materials.
  • Investigation of techniques involving membranes or soft tissue containment.
  • Examination of newer approaches like biodegradable sponges and growth factor-coated materials.

Main Results:

  • Some degree of alveolar ridge maintenance is observed across different methods and materials.
  • Bone fill is noted in preserved sockets, often with a significant proportion of residual graft particles.
  • Limited evidence supports ridge preservation for optimal 3-D implant positioning or long-term tissue volume maintenance.

Conclusions:

  • While ridge preservation shows some potential for maintaining alveolar dimensions, robust evidence for enhanced implant success is scarce.
  • Further research is needed to establish the long-term efficacy and predictability of ridge preservation for implant dentistry.
  • Maintaining the natural tooth remains the most effective strategy for preserving alveolar ridge volume.