Best Houston Dentist | How long do Dental Crowns Last?

How long do Dental Crowns Last?There are many variables involved, so it is a complex answer. It really depends on the patient, material used, and laboratory used.  Well done and well maintained crowns can last decades.  At URBN Dental, we exclusively use Da Vinci Laboratories.Many insurance companies will pay for replacement crowns after 5-10 years, meaning they aren’t surprised if the crown should be redone. Since these companies use their vast accumulation of data to make reasonable denials of any payment as much as they can, we can probably estimate on how long they last on average by insurance companies willingness to pay for replacements after 5-10 years.There is no question that poor hygiene and poor maintenance habits can lead to recurrent decay under the crown and cause need for its premature replacement. There are also Technical issues that can allow for a crown to last for many years or for just a few years.It is rare for a crown to fail alone, but it is common for the patient to neglect their crown.  Whether crowns are gold, porcelain on metal or all porcelain do not decay.  This does not mean that a tooth neglected of good hygiene practice will not decay.  Decay under a poorly maintained crown is the most common cause of crown failure in patients.As you know proper checkups and dental hygiene are very important. With that being said, 80% of crown/dental restoration failures can be attributed to dire issues, meaning that you may be a grinder or clencher. If the patient has Clenching or Bruxism habits or perhaps TMJ Dysfunction this can cause premature wear and chipping and thus loss of usefulness of the Crown. Often these fractures happen due to night time grinding and clenching. We ALL do it. Some more than others. When we eat we typically put 80-90 pounds per square inch of pressure on our teeth. Amazingly, people have been recorded at 3000 pounds per square inch in their sleep. I guess your brain just isn’t there to tell you to stop!   If you don’t want a dental crown to break you should make sure that the laboratory that the crown is made is reputable. At URBN Dental, we exclusively use Da Vinci Laboratories (as seen on ABC’s Extreme Make over). Everything else breaks, however the stronger the material, the less likely it will break. Emax is a lithium disilicate porcelain which boasts 400 megapascals of strength. Contrast that with a porcelain fused to metal (PFM) 120 megapascals, and traditional “pressed porcelain” at 130-160 megapascals. Our lab makes emax crowns completely out of emax, contrasted with a method of making a coping out of emax and then stacking traditional porcelain on it. The latter logically would be no stronger than the porcelain fused to metal crowns (PFM). Emax crowns can break, so that is why if you want it to never break, go with the gold.Typically, if you break a tooth or restoration while eating, it was already fractured and just waiting to pop.  That’s unless you are eating rocks or jawbreakers, etc. Also, proper use of crown is key. Although teeth are tools to help us to bite, chew and speak, they are not tools for holding roofing nails, biting finger nails or removing bottle caps.  Using a porcelain crown inappropriately can cause the porcelain to chip or fracture or the porcelain veneered on the metal base to break off.As long as the crown is manufactured to the highest standards, choosing the right material and fitted to your bite properly, it will have the potential to last a lifetime.Why do dental crowns need to be replaced? There can be a variety of reasons why a crown may need to be replaced. We will list some of the reasons as well along with the material of the crowns below:Crowns may get damaged or cracked. Excessive wear may thin down the material of the crown, in some cases the crown may cause wear on the opposing teeth. If oral hygiene is not kept up, there may be problems with tooth decay. Cosmetically a crown may be replaced if any of the front crowns are “PFM” or porcelain fused to metal. These particular crowns have a grey metal base and an external porcelain shell, so when light is used on the tooth it does not look very cosmetic.Dental crowns may fracture, specifically the porcelain part of the crown. All ceramic crowns that fracture typically crack through the entire crown. This typically requires the entire crown to be replaced. Making the right initial choice.This is a prime reason why the type of crown you have placed on a back tooth should have a proven history of being able to withstand the level of forces involved. Zirconia Crowns and eMax crowns typically do very well in the posterior region of the mouth. The most popular high durability and strength crowns are IPS eMax crowns and Zirconia BruxZir crowns.In terms of strength, zirconia tests as the stronger of the two. However, research has shown that eMax crowns have a 10 year survival rate, compared with Zirconia that has a 5 year survival rate.Repair solutions for all-ceramic restorations. If there is cracking or breakage of a ceramic crown, there is no repair option available. However, if there is a small chip, the crown itself can be smoothened down so it does not bother the tongue. Patching open margins with a filling material is not an option, because there is very low bond strength in that area which may lead to recurrent decay. Another type of crown is called a porcelain fused to metal crown. The skeleton of the crown is made out of metal, whereas the body or face of the crown is porcelain. They are fused together. Hence it is called a Porcelain fused to metal crown.When a porcelain fused to metal crown is broken, typically only the porcelain portion is fractured off leaving the metal portion intact. In other words, the metal portion will typically allow for the tooth to keep its seal and integrity. No replacement is necessary if only a small amount of porcelain is broken off, however, aesthetically it may not be very pleasing to the eye. Repair solutions for PFM crowns.If there is just minor damage, nothing needs to be done. Just generally smoothing is necessary.  It is possible for filling material (dental composite) to be bonded to the porcelain surfaces by a special technique called acid etching, silane coupling however, it is very technique and case sensitive. These type of patch fixes are generally short lasting and unpredictable.

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