Denture Fracture

• Clinical Definition: Breakdown or cracking of a partial or complete denture due to mechanical overload.

• Indications of Urgency: Fractured dentures with sharp acrylic edges that cut into the patient's tongue or cheek, patient unable to chew, local mucosal ulcerations, and/or a rapid change in facial symmetry.

• Treatment Options: Cold-cure acrylic resin chair-side repairs, laboratory processed heat-cure rebasing, laser welding of cobalt-chromium alloy frameworks, digital dentures.

A fractured denture will result in various sensory experiences for the patient including:

• Micro-instability: Patient perceives slight movement of the denture during speech and mastication indicating an incomplete hairline fracture.

• Fissures: Slight black lines that are apparent on the surface of the pink acrylic base. Often retain food stains.

• Roughness: Gritty or sharp feeling experienced by the patient with their tongue along the palate or lingual borders of the denture.

• Mucosal Irritation: Localized redness, chronic soreness, or blood blisters found on the patients' gums where the edges of the fractured denture cause abrasion to the soft tissue.

• Occlusal Misalignment: Teeth not contacting properly, placing additional stress upon the joints and muscles of the jaws.

While a fractured plate is considered a mechanical problem, there are certain clinical signs that indicate a deeper tissue injury or complication that require immediate attention:

• Epulis Fissuratum: Formation of hypertrophic tissue folds (overgrowth) caused by prolonged irritation from a fractured edge.

• Non-healing Ulcers: Sores located on the palate or ridges that fail to resolve in seven to ten days, increasing the likelihood of secondary bacterial and/or fungal (Candida albicans) infections.

• Hyperactive Gagging and Airway Risk: Patients experience a persistent, severe gag reflex or structural instability due to a fracture of the posterior palatal seal of the denture, creating an immediate risk of accidental choking.

• Unintentional Ingestion: Patients swallow fragments of a broken denture or metal clasps that need to be immediately evaluated medically due to possibility of obstruction in the airways or digestive tract.

• Trauma: Dropping a denture accidentally onto hard surfaces such as bathroom tile or sink basins during regular cleaning activities.

• Flexural Fatigue: Microscopic flexing of the acrylic resin base during repeated heavy chewing activities over extended periods of time. Material failure results from continued flexing.

• Masticatory Overloading: Eating foods that are traditionally hard or highly crunchy, such as rigid banana chips, hard murukku, or unboiled, poorly processed tubers. Alternatively, highly sticky foods like large portions of cooked kappa (tapioca) can exert severe pulling forces that destabilize the plate.

• Bone Resorption of Alveolar Ridge: Gradual atrophy of the alveolar bone over time creating voids below the denture bases. Chewing activity causes these voids to act like a pivot point snapping off acrylic material.

• Degradation of Materials: Aging degradation of polymethylmethacrylate (PMMA) resin that becomes brittle after five to seven years of exposure to saliva and other oral liquids.

• Bruxism: Long term nocturnal teeth grinding/clenching that applies severe vertical force to the prosthesis.

• Anatomical Variations: Large midline tori (bony prominences) on the palates of patients increase the stress concentrations of the prosthesis and therefore increase the likelihood of fractures at midlines.

• Habits Involving Improper Care: Boiling dentures or using extremely aggressive cleaners that create micro-cracks in the polymer matrix.

Follow this checklist to visually and tactically inspect your prosthesis prior to consulting a clinic:

• Cleaning/Drying: Cleanly wash your denture with mild soap then dry it using a soft cloth.

• Visual Examination: Inspect your denture in front of a strong light source. Look for fine dark lines and small cracks on both sides of the pink base and artificial teeth.

• Fragility Test: Place one hand on each side of your denture and use your fingers to lightly push outwards. If you see cracks appear or if the material appears too flexible, it is possible you have an incomplete fracture.

• Soft Tissue Examination: Evaluate your gum tissue, tongue, and cheeks for redness, pain, swelling, open wounds, etc. using a mirror.

Please do not try repairing your denture using consumer-grade super glues or adhesive kits. They contain industrial cyanoacrylates that release toxic byproducts harmful to oral tissue, quickly become brittle and fail under moisture and chewing forces, and can irreparably warp the acrylic margins, making a professional lab repair impossible.

A professional evaluation by a dentist involves a multi-step clinical assessment:

• Visual and Tactile Mapping: The clinician inspects the prosthesis under magnification to trace the exact path of the fracture line.

• Intraoral Fit Assessment: The denture is placed in the mouth to evaluate retention, stability, and border extension. Pressure-indicating paste (PIP) may be used to identify areas of uneven pressure.

• Occlusal Analysis: Checking how the upper and lower teeth meet using articulating paper to identify any destructive bite forces.

• Radiographic Evaluation: While X-rays do not show the acrylic denture, panoramic radiographs (OPGs) are used to assess the underlying bone density and check for retained root tips or pathology beneath the ridge.

The primary advantage of modern prosthodontics is that many types of denture repairs are now possible. These include:

• Chairside Acrylic Repair: When there is a small, clean fracture across the base, the dentist can prepare the broken edges with a dental burr and join the parts back together using a self-curing, autopolymerizing resin. The process is fast, allowing the clinic to restore the structural integrity of the appliance in a single short visit.

• Laboratory Heat-Cure Rebasing: When a denture has a weak base but otherwise good teeth, all the pink acrylic part is replaced through a dental laboratory using heat-and-pressure cured resin. This method produces the strongest result.

• Laser Framework Welding: Clasps made from cobalt-chromium or titanium that have broken are repaired using precise laser welding, which ensures they fit perfectly without distorting the metal.

• CAD/CAM Digital Remaking: If the denture cannot be repaired, then the latest technology (3-D Scanning and Milling) is used to make a brand-new digital denture. This makes sure the denture fits comfortably and accurately.

Repair cost of dentures in Kerala varies depending on the complexity of the fracture and what materials need to be used. In most rural towns, a simple chairside acrylic repair or replacing one tooth would run anywhere from Rs. 800 to Rs. 1500.
However, in larger cities such as Kochi, Trivandrum or Kozhikode, if you want to get lab processed rebasing for your partial denture or laser welding for your cast partial denture, it could range between Rs.2500 – 6000. Most standard medical insurance plans do not cover dental prosthetics. However, some local co-operative health organizations and welfare programs offered by state governments provide limited financial assistance to senior citizens who receive treatment at their local district hospital.

Any general dentist can handle basic or easy acrylic repair work; however, in many cases, more specialized care may be needed:

• Prosthodontist: Specializes in missing teeth and oral rehabilitation. See a prosthodontist for repeated fractures, significant bone loss, complicated partial denture design or when a complete remake is necessary.

• Oral Surgeon: May be needed if a fractured denture has injured deeper tissues, created chronic hyperplastic tissue folds (epulis fissuratum) that need surgical excision, or if dental implants are to be placed to stabilize a loose prosthesis.

• Emergency Situation: Within 2 – 4 Hours: If the sharp edges have created large open wounds with blood flow, or if pieces were swallowed or inhaled.

• Same Day Emergency Service: If a total fracture interfered with normal speaking or eating/drinking due to excessive social distress.

• Non-Emergency Scheduled Appointment: Minor chips, minute line defects, or fine hairline cracks that do not create pain and/or compromise the fit of the denture.

1. Can I continue wearing my denture even though it has developed a small crack?
   No. Even though the crack may seem very small, the prosthesis flexes continuously during mastication. If you continue wearing it, the micro-stress will cause the crack to propagate and ultimately snap completely apart, risking accidental ingestion or severe injury to your gums and tongue.

2. What length of time will it take for me to get a professional denture repair done in Kerala clinics?
   Most acrylic repairs require 2 – 6 hours. Urban clinics usually perform these repairs in less than 24 hours. Some clinics allow you to drop-off your denture in the morning and pick it up later that day.
    

3. Why does my denture always break in the same area?

Repeated fractures occur because your jawbone has shrunk (alveolar resorption) resulting in a non-even space below the denture base. Therefore, the denture continually flexes and snaps back into shape under normal occlusal pressures until either the base is rebased or replaced.

• Denture Stomatitis: Long-term irritation and inflammation of the mucosa located directly beneath the denture base, especially exacerbated by bacterial accumulation within cracked fracture lines.

• Angular Cheilitis: Cracking or splitting of the skin at the angles of the mouth, causing discomfort and ulceration at the corners of the mouth, brought about by a decreased vertical dimension when a broken or altered denture disrupts your original bite relationship.

• Accelerated Ridge Atrophy: Fastest rate of alveolar ridge loss due to continuous misaligned forces exerted upon the remaining bone structure from an improperly fitting or fractured prosthesis.

• Relining Denture: Attaching a new layer of resin to the tissue side of the denture to help close spaces generated by alveolar bone shrinkage. This will help to avoid additional fractures.

• Implant Supported Overdentures: Insertion of 2 – 4 dental implants in the mandible to secure an overdenture firmly in place. This will eliminate the flexural stresses acting upon acrylic that generate fractures.

• Tissue Conditioning: Application of a temporary soft medication liner to internal surfaces of the denture to soothe and condition inflamed mucosal surfaces prior to constructing a new prosthesis.

From an engineering standpoint regarding prosthodontics, fractures of dentures are rarely simply failures of material alone. They often indicate some degree of anatomical changes occurring in your jawbone. Over time, bone loses density and volume. This results in voids developing underneath your acrylic bases. Stress becomes unevenly distributed among the various components of your prosthesis. Although today’s CAD/CAM materials exhibit excellent fracture resistances, scheduled visits approximately every six months are essential. Early identification of micro-cracks and subsequent relining can extend serviceable lifespan of your prosthesis and preserve overall oral health.