Evironmental impact of direct dental restorative materials :amalgam versus resin composite Flashcards Preview

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Flashcards in Evironmental impact of direct dental restorative materials :amalgam versus resin composite Deck (12)
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1

Describe the Minamata convention on mercury (2013) .

• Environmentally driven
• Global phase down (was out) of dental amalgam
• Estimated 270 – 341 metric tonnes Hg globally derived from dental amalgam use. : This equates to approx. 20% of global mercury consumption for products

2

what is use of dental amalgam no longer allowed for?

-children under 15 years old
-pregnant women
-breastfeeding women
-EXCEPT when deemed strictly necessary by the dental practitioner based on the specific medical needs of the patient

3

what is the Scottish dental clinical effective program guidance on dental amalgam?

restrictions aim to help reduce environmental mercury pollution and are not as a result of any safety concerns about amalgam fillings for dental patients
Dental amalgam is the only suitable material despite the environmental concerns and so the dentist may advice amalgam filling

4

what is mercury released from?

• Natural events – Volcanic eruptions
• Anthropogenic – industrial processes, coal combustion, dental treatment
• And accumulates as sediment finding way into water ways

5

why do we need to protect environment by reducing mercury use?

Methylate Hg into methylmercury:
• Highly toxic
• Gives access to food web for use by low order organisms
• Scope for biomagnification in predatory long‐lived fish e.g. Tuna that consumed by Humans

6

Name potential environmental pollution routes.

• Atmosphere and Water from dental practices
•Internment/Cremation of bodies with amalgam restorations
• Chewing/masticationoffoods

7

How are these routes reduced?

• These may be reduced by:
-Dental Unit traps & amalgam separators
-Safe and regulated disposal of waste amalgam
-Incorporation of Selenium filters into chimneys of crematoria.

8

Discuss environmental costs of burial.

89% of coffins are chipboard veneer
• Contains formaldehyde that also used in embalming
• Leaches out into groundwater
• Energy required to make or alternatively may be consumed if using a concrete vault.

9

Discuss environmental costs of cremation.

• Energy – 285 KWh gas and 15 KWh electricity
• Generates Carbon Dioxide equivalent to a car journey of 800 Kilometers
• Approximately 16% of mercury in the air is from dental amalgams

10

Discuss potential environmental pollution concerns of resin composite.

Bisphenol A:
• Mimics oestrogen (said to be at concentration of no risk in composites)
• Currently a small contributor to overall environmental pollution.

11

how do resin composites enter the environment?

• Manufacture
• Burial of those with composite restorations
• Disposal of out of date materials from dental practice that end up in landfill
• ALSO consider at placement microparticulate/microplastic pollution cf. Shower gel beads : enter food chain, ingested by fish and eaten by humans.

12

Name potential effects of bisphenol A.

• Genital tract abnormality
• Childhood obesity
• Infertility
• Increased incidence of breast cancer