{
  "title": "Same-Day Crowns Go Mainstream",
  "subtitle": "How CAD/CAM and 3D printing can turn a two-visit crown into one appointment",
  "slides": [
    {
      "kind": "cover",
      "heading": "One tooth, one appointment",
      "body": "Chairside scanners, milling units, furnaces and resin printers can now complete selected crowns during one visit. The technology changes the workflow, not the biology: the tooth still needs diagnosis, sound preparation and a sealed margin.",
      "bullets": [
        "Best suited to suitable single-tooth cases",
        "Not every tooth or material is appropriate",
        "A dental laboratory may still be needed"
      ]
    },
    {
      "kind": "why",
      "heading": "Why the second visit can disappear",
      "body": "A conventional crown may require an impression, temporary crown, laboratory fabrication and a later cementation visit. Digital dentistry replaces the physical impression with an intraoral scan, sends the design to software and fabricates the restoration in the clinic.",
      "bullets": [
        "Scan: teeth, gingiva and occlusion are recorded digitally",
        "Design: the crown follows the prepared tooth and opposing bite",
        "Make: a block is milled or a restoration is printed and post-processed",
        "Fit: contacts, margins, shade and bite are checked clinically"
      ]
    },
    {
      "kind": "steps",
      "heading": "The protocol, step by step",
      "body": "The dentist examines the tooth, checks the pulp and periapical tissues when indicated, removes decay or defective material, and prepares enamel and dentine with a defined finish line. Retraction and moisture control expose the cervical margin. The scan captures the preparation, adjacent teeth and opposing arch. Software designs the occlusal anatomy, proximal contacts and emergence profile. The restoration is fabricated, tried in, adjusted, polished or glazed, then bonded or cemented after surface treatment.",
      "bullets": [
        "Anesthesia and rubber dam or other isolation may be used",
        "Lithium disilicate and zirconia require different conditioning protocols",
        "Resin-ceramic blocks may be milled and polished chairside",
        "Printed restorations require washing, light curing and often heat treatment before final use"
      ]
    },
    {
      "kind": "rule",
      "heading": "The one rule that matters",
      "body": "The crown must seal the prepared tooth and restore function without injuring the pulp, periodontal tissues or opposing tooth. A fast workflow cannot compensate for an open margin, contaminated bonding field, inadequate thickness, unstable occlusion or untreated caries.",
      "bullets": [
        "The finish line should be visible and clean",
        "The proximal contact should permit appropriate cleaning",
        "The bite must be checked in maximum intercuspation and excursions",
        "The cervical contour should respect the gingival sulcus"
      ]
    },
    {
      "kind": "myth",
      "heading": "Myth: same-day means lower quality",
      "body": "Not automatically. The outcome depends on diagnosis, preparation geometry, material selection, bonding or cementation, occlusal control and finishing. A milled crown is not simply printed plastic. Common options include feldspathic ceramic, lithium disilicate, zirconia, hybrid ceramic and temporary resin materials. Each has different strength, translucency, wear and bonding behavior.",
      "bullets": [
        "Lithium disilicate can provide a glass-ceramic bond when etched and silanated correctly",
        "Zirconia is not etched like glass ceramic and commonly uses air abrasion plus a phosphate-containing primer or cement",
        "Printed permanent materials are developing, but their indication depends on the specific material and regulatory approval",
        "A laboratory remains valuable for complex shade characterization, multi-unit cases, implant work and difficult occlusion"
      ]
    },
    {
      "kind": "personalise",
      "heading": "Make it yours: what changes the plan",
      "body": "A molar with heavy chewing forces, limited enamel, deep subgingival margins, a cracked tooth, bruxism, little remaining tooth structure or an uncertain pulp may need a different material or a laboratory workflow. An anterior tooth with high cosmetic demands may require layered ceramic or laboratory characterization rather than a rapid monolithic restoration.",
      "bullets": [
        "Ask which material is planned and why it fits the tooth",
        "Ask whether the pulp, root and periodontal tissues are healthy enough for treatment",
        "Tell the dentist about grinding, clenching, sensitivity and previous restorations",
        "The final choice should match anatomy, force, isolation, appearance and cleansability"
      ]
    },
    {
      "kind": "dentist",
      "heading": "When to see a dentist",
      "body": "Seek an examination for pain on biting, lingering hot or cold sensitivity, swelling, a loose or fractured filling, a darkened tooth, food trapping or a crown that feels high. These symptoms can indicate caries, a cracked cusp, pulpal inflammation, apical disease or periodontal problems. A same-day crown is not a substitute for treating the cause.",
      "bullets": [
        "Urgent swelling, fever, difficulty swallowing or difficulty breathing needs prompt care",
        "A painful tooth may need endodontic treatment before restoration",
        "A crown should not be placed over active decay or an unstable gum condition",
        "Digital speed is useful only when the diagnosis is sound"
      ]
    },
    {
      "kind": "closer",
      "heading": "So, is the lab business shrinking?",
      "body": "For selected single crowns, some fabrication has moved into the dental clinic. The laboratory business is not disappearing. Laboratories still contribute to complex cases, implant restorations, removable prostheses, layered aesthetics, quality control and production capacity. The practical answer is simple: same-day crowns are a workflow option, not a universal replacement for clinical judgment or laboratory expertise.",
      "bullets": [
        "Book an assessment with Dental Nation to learn whether your tooth is suitable",
        "Discuss material, isolation, bite, shade and long-term maintenance before treatment",
        "After brushing, spit rather than rinse, and clean between teeth with an interdental brush where the gap allows or floss where it fits"
      ]
    }
  ],
  "report": {
    "summary": "Same-day crowns use digital scanning, computer-aided design and in-clinic milling or printing to shorten selected restorative cases. The biological and mechanical requirements remain unchanged: accurate diagnosis, conservative preparation, visible margins, moisture control, correct material processing, stable occlusion and a durable seal. Chairside production may reduce laboratory work for some single crowns, while laboratories remain important for complex, aesthetic and implant cases.",
    "sections": [
      {
        "heading": "Equipment math",
        "body": "A chairside workflow requires an intraoral scanner, design software, a milling unit or approved printer, finishing equipment and, for many ceramics, a furnace or crystallization cycle. The time saved comes from removing impression shipping, laboratory scheduling and the temporary-to-final interval. Equipment does not remove the need for clinical adjustment or quality checks."
      },
      {
        "heading": "Materials race",
        "body": "Glass ceramics such as lithium disilicate offer translucency and can be adhesively bonded after hydrofluoric-acid etching and silanization by trained clinicians. Zirconia offers high strength but follows a different surface protocol because it is not a glass ceramic. Hybrid ceramics and resin-based blocks can be milled and polished efficiently. Printed permanent restorations require the exact validated resin, post-processing cycle and indication specified by the manufacturer."
      },
      {
        "heading": "Clinical answer",
        "body": "One appointment is realistic for selected teeth with a clear diagnosis, accessible margins, adequate remaining structure, suitable occlusion and a material that can be correctly processed chairside. It is not automatically appropriate for deep margins, extensive structural loss, uncertain pulp status, complex aesthetics, multiple-unit rehabilitation or implant cases."
      }
    ]
  },
  "guardrails": [
    "Do not state prices unless using a canonical Dental Nation offer.",
    "Do not invent statistics, success rates or survival percentages.",
    "Do not imply that every crown can be completed in one appointment.",
    "Do not claim hydroxyapatite is equivalent to fluoride.",
    "Do not recommend mouth taping.",
    "Do not present charcoal whitening as proven.",
    "Do not claim alcohol mouthwash causes cancer.",
    "Do not disparage floss. Prefer interdental brushes where the gap allows.",
    "Use no traditional, cultural or religious attire references in imagery.",
    "Use Western professional imagery only.",
    "Use no em dashes."
  ],
  "sources_consulted": [
    "American Dental Association, Evidence-Based Clinical Practice Guideline on Nonrestorative Treatments for Carious Lesions",
    "American Dental Association, clinical guidance on dental radiographs and caries diagnosis",
    "International Organization for Standardization, ISO 6872 Dentistry: Ceramic materials",
    "International Organization for Standardization, ISO 4049 Dentistry: Polymer-based restorative materials",
    "American Association of Endodontists, diagnostic terminology and evaluation principles"
  ]
}