How to fix Zirconia (MS Zircraft) crown fitting problems

By Sarfraz Ahmed

GC Zircraft
GC Zircraft

The past ten years have seen an increase in the use of zirconia ( MS Zircraft) crowns. Because zirconia ( MS Zircraft)  restorations offer robustness and realistic aesthetics, patients today prefer them to metal-based crowns. Furthermore, zirconia ( MS Zircraft) is quite strong and can survive repeated, vigorous chewing and grinding. 

zirconia ( MS Zircraft) restorations can last a patient their entire lifetime if kept up to date. Some dentists choose not to utilise zirconia ( MS Zircraft) crowns or develop the skills necessary to place them in their patients’ mouths because of the material’s recent development. This inexperience might occasionally result in crowns that don’t fit properly.

You should not dismiss problems with the fit of your dental crown. For the patient’s safety, any issues with dental crowns must be fixed immediately.

It’s crucial that you understand how to properly place a crown and how to alter the fit of the crown should issues emerge because zirconia ( MS Zircraft) crowns are made to help seal and safeguard your patient’s teeth from additional harm.

Why might zirconia ( MS Zircraft) crowns not fit properly?

  • The dental crown was made in a hurry. Crowns that are hurried can have inappropriate margins. The infiltration or seepage of saliva and bacteria into crowns that have open margins in the cement can cause decay and periodontal problems.
  • The crown wasn’t properly anchored. To prevent mistakes during cementation, such as a gap in the crown, clinicians must carefully inspect the crown margins. This opening enables saliva and bacteria to enter the crown and cause tooth decay.
  • It was unclear what the impression was. The quality of the imprint will be impacted by air pockets, drag or pull marks, missing impression data, incorrect marginal impressions, and subpar impression material.
  • Preparation irregularities.

How to resolve issues with debonding

  • Try changing your cementation procedure if you notice that your zirconia ( MS Zircraft) crowns are debonding. Before polishing the tooth with pumice, the majority of clinicians check the zirconia ( MS Zircraft) crown’s fit in the patient’s mouth.
  • If the zirconia ( MS Zircraft) crown does not come with a built-in primer, proceed by cleaning the intaglio surface of the restoration before priming or adhering it.
  • The crown should then be cemented, the cure tacked, and any extra cement scraped off.

Even though these are all common practises, therapists occasionally neglect to fully clean the intaglio surface, which leads to bonding failure. For the zirconium oxide sites to successfully bond in the patient’s mouth, the phosphate groups must be carefully removed since they form a link with zirconium oxide.

Three strategies for eliminating phosphate groups

  1. Sandblasting. Most manufacturers advise lightly sandblasting the inside surface at low pressure, even if it’s occasionally not advised to use aluminium oxide with a 50-micron diameter. Always read the manufacturer’s instructions before using this technique.
  2. Hypochlorite of sodium. The intaglio of the crown is cleaned with gauze soaked in sodium hypochlorite or full hydrogen peroxide at a 5% concentration. The cleaning solution is then removed, and the restoration is allowed to air dry.
  3. Ivoclean. Use a specialised solution, such Ivoclean. Before rinsing, let the solution sit on the crown for 20 seconds. After air drying, the crown is prepared for bonding.

Preventing facial-lingual lingual rocking in restorations

Do you think zirconia ( MS Zircraft) crowns rock facial-lingually but the margins fit perfectly? zirconia ( MS Zircraft) crowns for patients must be fitted more carefully and take longer to correct this issue than you might imagine.

Any irregularities are removed when the digital image of the patient’s tooth is created because milled restorations have smooth internal surfaces and cannot fit over them or undercuts.

On conventional versions, a die-spacer is typically employed, which leaves a gap of about 50–100 microns. Have your clinician check that the computer programme when creating zirconia ( MS Zircraft) restorations is set to provide well-fitting margins while defining the size of the space between the fit surface and the prep site. This easy procedure will prevent zirconia ( MS Zircraft) crowns from swaying facial-lingually and serves as a functional equivalent of a traditional die-spacer.

Patients who have poorly fitting crowns may become dissatisfied. Call our lab immediately to speak with our technical staff about your unique case if you ever face fit concerns with a zirconia ( MS Zircraft) crown. The technical team at MS Dental Arts Lab is prepared to assist with any problems involving improperly fitted restorations and will collaborate with your office to find the best solution.

To arrange a meeting with our technical team, click here.

Guidelines for preparing Zirconia (GC Zircraft)

GC Zircraft
GC Zircraft

Since its introduction to the dentistry industry, zirconia has grown to be the material of preference for dentists who want to offer their patients the most cutting-edge metal-free restorations.

With the addition of a wider variety of milling pucks, zirconia has substantially improved, enabling greater shade variation and translucencies that nearly match natural dentition. Zirconia’s physical attributes enable precision-fitting restorations, durability, and strength in addition to better aesthetics. It is crucial to make sure adequate preparatory criteria are followed in order to enhance the outcome of seated Zirconia restorations and save chairtime.

The significance of tooth preparation design

  • Less stress is placed on the crown because of smooth edges. The likelihood of fractures happening is lower due to the lesser stress.
  • For ceramic repairs, a passive fit is necessary.
  • Ceramics with uniform reduction provide high strength.
  • The best aesthetic outcomes come from sufficient reduction.
  • Smoother preparations are read more precisely by digital scanners.

Guidelines for a front zirconia crown’s preparation

  • You must leave enough space while preparing a tooth for an anterior Zirconia crown so that the wall thickness has a minimum of 0.3 mm and is optimum between 1.0 mm and 1.5 mm, or 1.8 to 2.0 mm incisal reduction.
  • At the gingival margin, there should be at least a 0.5 mm decrease and a clear, continuous circumferential chamfer.
  • A 5° angle should be used for the tooth’s horizontal and vertical preparations; a bevel is not advised.
  • The lingual aspect of the anteriors should be reduced using a football diamond to generate a concave lingual, and all of the incisal edges should be rounded.

Guidelines for a posterior zirconia crown preparation

  • You must leave enough space while preparing a tooth for a posterior Zirconia crown so that the wall thickness is at least 0.5 mm thick and, ideally, between 1 mm and 1.5 mm or 1.5 to 2 mm occlusal reduction.
  • The pretreatment should taper from 4 to 8 degrees. A decrease of at least 0.5 mm is needed at the gingival margin, and it must have a clear and continuous circumferential chamfer.
  • A bevel is not advised, just like with the preparation for an anterior crown. Make sure that all of the occlusal edges are rounded.
  • For zirconia, shoulder and Chamfer preparations work best. Although they are not advised, feather edge preparations can be used for full-Zirconia crowns. Ask your dental laboratory if this prep form can be made using their fabrication procedure.

Reasons why a crown preparation might not be suitable for a zirconia restoration

  • The preparation must be free of gutter preparation and any undercuts in order to be suitable for a Zirconia crown restoration.
  • Both the preparation of a parallel wall and a 90° shoulder are unacceptable.
  • Zirconia restorations are not recommended for teeth with sharp incisal or occlusal edges.

completing zirconia restorations with cement

  • When assembling and glueing Zirconia restorations, marginal finishing is frequently necessary.
  • To prevent plaque buildup, which causes tooth sensitivity and periodontal disease, extra cement must be removed.
  • Using non-cutting, safe-end finishing burs for gingival margins will safeguard the soft tissues.
  • A Zirconia restoration’s surface may be slightly roughened by these modifications, but polishing should be simple and result in an incredibly smooth surface.

If changes are necessary, a fine diamond bur suited for a Zirconia restoration must be used. Zirconia will develop micro-fractures as a result of excessive heat or sparking from an aggressive reduction. In order to limit the quantity of heat created, it is imperative to utilise as little pressure as feasible.

Please remember that our knowledgeable technical team is there to help you if you would like to talk about a Zirconia implant case in more detail: Click the link to get in touch with us.

5 indications that Zirconia (MS Zircraft)  dental crowns are preferable to PFM

By Sarfraz Ahmed

GC Zircraft Zirconia
GC Zircraft

Because Zirconia (MS Zircraft)  and porcelain restorations offer strength and natural looks, patients of today prefer them to metal-based crowns. Patients have been asking for milled Zirconia (MS Zircraft)  restorations more frequently than porcelain-fused-to-metal (PFM) restorations ever since they were first introduced.

When recovering a single tooth, some dentists only recommend Zirconia (MS Zircraft)  or all-ceramic restorations. The majority of dental offices are shifting away from using PFM and all-ceramic crowns in favour of using Zirconia (MS Zircraft)  to make fixed tooth prostheses. Zirconia (MS Zircraft)  is quickly replacing other materials as the preferred choice for creating dental crowns and other restorations due to its exceptional aesthetics and near-indestructibility.

Describe Zirconia (MS Zircraft) .

Worldwide, Zirconia (MS Zircraft)  is a metal oxide that is made from zirconium, a metal belonging to the titanium family. Zirconia (MS Zircraft)  is used to create common home objects like crockery, pipes, and electrical fixtures. Zirconia (MS Zircraft)  is a perfect material for dental crowns due to its inherent strength and durability. For patients who require posterior crowns, which need to be strong to masticate food, Zirconia (MS Zircraft)  crowns are the ideal option.

Describe PFM.

Porcelain-fused-to-metal (PFM) crowns blend porcelain and metal as their name implies. The porcelain overlay is color-matched to the original teeth, however if there is gingival recession, the darker metal hue may show at the gingival margin. PFM restorations are typically suggested by dentists for individuals who want strength and a natural appearance.

Why Choose Zirconia (MS Zircraft)  Instead of PFM?

  • Extraordinary Strength.
  • Smile That Looks Natural.
  • Durability and dependability
  • Customization.
  • more patient-safe.

1. Extraordinary Strength

For dental crowns, Zirconia (MS Zircraft)  provides excellent strength and durability. In comparison to porcelain or PFM restorations, it is at least three times stronger. Zirconia (MS Zircraft)  restorations can survive the stresses of bruxism and mastication because, unlike porcelain, it can sustain wear and tear without chipping. The crown on this tooth is practically unbreakable and made to survive the tough environment, especially in the back of the mouth, thanks to more recent monolithic Zirconia (MS Zircraft)  (single, solid blocks of Zirconia (MS Zircraft) ).

2. Authentic Smiling

There is no metal lining in Zirconia (MS Zircraft)  near the gingival margin. At the coronal aspect of the crown, porcelain-fused-to-metal (PFM) crowns have a metal layer underneath the porcelain layer. When patients smile, this metal lining is typically visible at the gingival margin. Zirconia (MS Zircraft)  crowns completely do away with the metal lining, allowing patients to grin with assurance. Zirconia (MS Zircraft)  crowns can also be customised to fit any size or form to match a patient’s other teeth.

3. Dependability and Strength

Zirconia (MS Zircraft)  is even more resilient than the PFM ceramics that are often utilised. For instance, solid Zirconia (MS Zircraft)  is more resistant to mastication and grinding because it has more stabilisers than PFM ceramics. Zirconia (MS Zircraft)  restorations can last a patient their entire lifetime if well-maintained.

4. Personalization

Zirconia (MS Zircraft)  can be produced in a variety of ways to meet the needs of the patient due to a variety of parameters, including chemical composition and manufacturing requirements. This personalization reduces the room for error and guarantees a perfect fit for each person.

5. Patients are Safer

Patients who have allergic reactions to the alloys in PFM restorations won’t develop allergies because of Zirconia (MS Zircraft) ‘s high biocompatibility. Zirconia (MS Zircraft)  has exceptional biocompatibility, which makes the crowns and bridges made from it quite safe for use in clinical settings.

Since many years ago, Zirconia (MS Zircraft)  restorations have been utilised effectively and offer patients great strength, longevity, and realistic-looking aesthetics. These older-style restorations are becoming obsolete because Zirconia (MS Zircraft)  is currently in greater demand than PFMs.

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