Table 8.
Life-cycle impact assessment results; summary of environmental burdens for the use of Essix or Hawley retainer when factoring in lifespan.
| Impact category | Units | Essix | Hawley |
|---|---|---|---|
| Non-carcinogenic effects | CTUh | 1.01E-07 | 9.69E-09 |
| Minerals and metals | kg Sb-eq | 6.15E-06 | 7.79E-07 |
| Freshwater ecotoxicity | CTU | 1.62962276 | 0.08261 |
| Climate change total | kg CO2-eq | 1.58928629 | 0.15337 |
| Freshwater eutrophication | kg P-eq | 3.41E-04 | 2.25E-05 |
| Respiratory effects—inorganic | Disease incidence | 4.83E-08 | 3.61E-09 |
| Photochemical ozone creation | kg NMVOC—eq | 0.00407733 | 0.00037 |
| Terrestrial eutrophication | mol N-eq | 0.01179514 | 0.00105 |
| Marine eutrophication | kg N-eq | 1.29E-03 | 0.00011 |
| Ozone layer depletion | kg CFC-11-eq | 4.56E-08 | 6.51E-09 |
| Ionising radiation | kg U235-eq | 0.08518714 | 0.00736 |
| Land use | Points | 15.6073039 | 0.83699 |
| Freshwater terrestrial acidification | mol H+-eq | 0.00553352 | 0.00066 |
| Fossils | MJ | 34.1093689 | 2.44299 |
| Carcinogenic effects | CTUh | 2.29E-08 | 3.60E-09 |
| Dissipated water | m3 water-eq | 0.95744524 | 0.0191 |