Work it out.
Calculators
Wax to alloy (casting weight)
Arkimedes' princip
Carat and gold content
Forholdsregning (karat/24)
Mixing ratio of plaster/investment
Ratio arithmetic
Zirconia oversize for sintering
Producentdata (zirkonia-sintring, lineært svind)
Denture base acrylic: powder/liquid ratio (heat-cured)
Producentdata (varmehærdende protesebasis-akryl, typisk P:L ≈ 2:1 vægt)
Repair acrylic: powder/liquid ratio (cold-cured)
Producentdata (selvhærdende/koldhærdende akryl, typisk P:L ≈ 1,7-2:1 vægt)
Alginate: water-to-powder ratio
Producentdata (alginat-aftryksmateriale)
Casting cost — alloy price
Forholdsregning (pris × vægt)
Grinding/polishing disc: max. rpm
Fysik (v = π·D·n) / EN 12413 (maks. arbejdshastighed for slibende værktøj)
Ceramic kiln: heating time to firing temperature
Producentdata (dental porcelænsovne; fx Ivoclar IPS e.max Ceram: standby 403 °C, ramp ca. 40 °C/min, brænding 750 °C)
Expansion screw: number of turns
Producentdata (ortodontiske ekspansionsskruer, typisk 0,8-1,0 mm/omgang)
Local exhaust at the grinding table — required air volume
LEV-designformel (ACGIH Industrial Ventilation Manual)
Staple wire: bending stiffness at different diameters
Fysik (bøjningsstivhed ∝ diameter⁴, bjælketeori)
Sprue/runner — alloy weight from dimensions
Geometri (cylindervolumen)
Investment expansion vs. metal shrinkage — net deviation
Dental materialelære (ISO 15912 / ADA-specifikation nr. 2 for indstøbningsmasse)
Reuse of casting alloy — new/used ratio
Dental materialelære (litteratur om omstøbning/recasting af dentallegeringer)
Tools that work in all subjects
Whatever your programme is called, these tools calculate the same — Pythagoras, area, percentages and units are not tied to one trade.
- Pythagorasa² + b² = c²Find the missing side, set out a right angle, check whether a room is square, and find the space diagonal.
- Area and perimeterm²Rectangle, triangle, trapezium, circle and composite shapes — area and perimeter.
- Volume and surface aream³ · lBox, cylinder, cone, sphere, pyramid, prism, pipe and frustum — also in litres.
- Percent%Percentage of, how many per cent, percentage change, discount and VAT.
- Scale and ratios1 : 50From drawing to reality, area and volume to scale, the rule of three and dividing in a ratio.
- Unit convertermm ↔ mFrom mm to km, Pa to bar and kB to GB — with the unit staircase.
- Time calculations and the clockt : minTime between two clock times, add time, and 1.75 h = 1 h 45 min for the timesheet.
- Slope and fall% · ° · 1:xFall from level to level, in per cent, per mille, degrees and mm per metre — and the height difference.
- Material consumption including wastem² + %Boards, paint, battens at c/c spacing and packs — for a composite surface or a whole room, with waste.