What Body Parts Don't Burn in Cremation: A Detailed Look at What Remains
The process of cremation is often shrouded in mystery, and one of the most common questions people have is about what exactly happens to the body during this final disposition. Specifically, many wonder if all body parts completely burn away. The short answer is that while most organic material turns to ash, certain inorganic components of the human body are designed to withstand the extreme temperatures of a cremation chamber. Let's delve into the specifics of what body parts don't typically burn completely in cremation.
Understanding the Cremation Process
Cremation involves placing the body in a specialized furnace called a retort. This retort is heated to temperatures ranging from 1,400 to 1,800 degrees Fahrenheit (approximately 760 to 980 degrees Celsius). At these intense temperatures, the organic tissues and fluids of the body undergo a process of oxidation, essentially burning away and reducing to gases and particulate matter. This is a crucial distinction: it's not incineration in the traditional sense of turning everything to ash, but rather a transformation of organic matter.
Inorganic Materials That Withstand Cremation
While organic tissues break down, certain inorganic materials within the body are far more resilient and will not fully combust. These are primarily the materials that are not biological in origin, or parts of the skeletal structure that are exceptionally dense.
Dental Fillings and Prosthetics
One of the most common examples of materials that don't burn in cremation are dental fillings. Historically, these were often made of amalgam, a mixture of metals like silver, mercury, tin, and copper. These metals have very high melting points and will not vaporize at cremation temperatures. Modern dental materials also often contain metals. Similarly, dentures can be made of acrylic or porcelain, and while the acrylic may break down to some extent, porcelain is a ceramic and will remain largely intact. This is why, in some cases, crematories will attempt to remove dentures before the cremation process begins, though this is not always possible or practical.
Medical Implants
Pacemakers are a prime example of medical implants that require special handling. These devices contain batteries and electronic components that are not designed to withstand high heat and could potentially explode. For this reason, pacemakers are typically removed from the body prior to cremation. Other medical implants, such as artificial joints (often made of titanium or stainless steel), hip replacements, or screws and plates used in orthopedic surgeries, are also made of metal alloys. While the metal may warp or discolor, it will not burn away. These metallic fragments are collected after the cremation process.
Skeletal Remains
The human skeleton is composed of bone tissue, which is a living organ that contains organic and inorganic components. During cremation, the organic matrix of the bone will burn away. However, the mineralized part of the bone, primarily calcium phosphate, is much more resistant to heat. This mineralized bone will not turn to ash but will remain as small, bone-like fragments. These fragments are what are then processed further to create the fine "ashes" or cremated remains that are returned to the family.
Artificial Body Parts
In cases where individuals have had artificial limbs or other prosthetics made of metal or durable plastic, these items will also not burn away during the cremation process. Similar to medical implants, these are typically removed beforehand if possible. However, if they are internal and not easily accessible, they will remain after the cremation and are usually separated from the bone fragments.
The Purpose of "Ashes"
It's important to clarify that the "ashes" returned after cremation are not truly ashes in the way we think of them from burning wood. They are, in fact, the pulverized fragments of the cremated bone. After the primary cremation process, the retort is opened, and any non-combustible materials like metal fragments from implants are removed. The remaining bone fragments are then placed in a specialized processor, often called a "cremulator," which grinds them down into a coarse sand-like consistency. This is what is commonly referred to as cremated remains or "ashes."
Conclusion
So, while the vast majority of the body's organic material is transformed into gases and vapors during cremation, certain inorganic components and dense bone fragments are designed to withstand the extreme heat. Dental work, medical implants, and the mineralized portions of bone are the primary examples of what doesn't burn completely in cremation. Understanding this process can provide clarity and peace of mind to those navigating end-of-life decisions and arrangements.
Frequently Asked Questions (FAQ)
How are non-combustible items removed?
After the cremation process is complete, the retort is cooled, and a crematory operator will carefully sift through the contents. Magnetic separators are often used to collect any metallic fragments from medical implants. Larger items, like remnants of artificial joints, are typically picked out by hand. This step is crucial to ensure that only the processed bone fragments, which constitute the cremated remains, are returned to the family.
Why are pacemakers removed before cremation?
Pacemakers contain batteries and sensitive electronic components that are not designed for high temperatures. If a pacemaker is not removed, the heat can cause the battery to rupture or explode, which can be a safety hazard within the cremation chamber and potentially damage the equipment. Therefore, regulations and best practices mandate their removal prior to cremation.
What happens to gold teeth or fillings?
Gold, being a precious metal with a very high melting point, will not burn away. While the porcelain or other materials in a gold tooth might degrade, the gold itself will remain. If a gold filling or crown is present, it will survive the cremation process. These metallic remnants are typically collected during the separation process after cremation.
Are there any legal requirements regarding the removal of implants?
Yes, in most jurisdictions, it is a legal requirement to identify and remove devices that could pose a safety risk, such as pacemakers and radioactive implants, before cremation. Crematories have established protocols to ensure compliance with these regulations, often requiring information from the next of kin or medical providers about any implanted devices.
