Prosthodontips – produce an excellent crown preparation

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This week the Prosthodontips staff take a better have a look at the tough space of crown preparations and provides their prime suggestions for getting ready the tooth.

For a very long time crown preparations have been my least favorite a part of dentistry. I discovered them tough, time consuming, and struggled to get constant outcomes.

Over the previous 10 years I’ve labored arduous to develop into snug with getting ready enamel for crowns. On this month’s column I’ll share with you a few of my prosthodontips to get the right crown preparation each time

In an effort to create a superb crown preparation, we first have to know what an imaginary prefect crown preparation would appear to be.

As soon as we have now this in our minds eye, we are able to attempt to work in direction of this.

Options of an ideal crown preparation

Enough discount

The quantity of tooth discount required is right down to materials science.

Sure supplies require extra discount than others. This is because of bodily or optical properties.

The quantity of preparation required is finest gleaned from the producer of the fabric you plan to prescribe for the crown fabrication. Additionally it is invaluable to debate discount necessities along with your technician. They will let you know how a lot house they want (and due to this fact what discount it is advisable perform) to optimise the crown you obtain from them.

Sometimes, dental supplies require a discount of between -0.7mm and 2mm for a crown.

Appropriate taper

The proper taper will end in a crown preparation with sufficient retention and resistance.

Some clinicians recommend preparations require a taper of between 2° and 6°. Nevertheless, these numbers should not achievable in medical observe.

A taper of between 10° and 20° is normally sufficient and achievable. In actuality this implies a preparation that’s as parallel as you can also make it, with none undercuts.

Trying to organize a tooth with a taper (even a really small one) will go away you with an over-tapered preparation.

Easy define

Impression supplies and intraoral scanners don’t like sharp edges. We would abrade them away on a mannequin, and it’s tough for an intraoral scanner to select them up precisely.

Due to this fact, it’s vital to shine your preparations. That is performed with effective diamond burs, abrasive disks, or white stones.

Clear margins

Margins needs to be easy and steady with no steps. That is tough to realize. I discover {that a} effective grit bur (yellow or white) could be very useful in refining the margins.

Moreover an end-cutting solely bur is sensible for smoothing steps alongside the margin.

Prosthodontips for a superb crown preparation

Prep for the crown you need, not the tooth you will have

If a tooth is damaged, worn, or within the incorrect form, then it is vitally straightforward to lose your bearing and get taken away from the right preparation you think about.

Use a putty matrix of the perfect tooth form and place (ideally from a wax-up) as a information to maintain you conscious of what you’re aiming for.

Put together from crown down

Probably the most tough facet of a crown preparation is the interproximal margin. Due to this fact it is smart to cut back the quantity of preparation required within the space.

Put together the occlusal floor first, then the buccal and palatal/lingual. Put together as shut as you may to the contact level. Then you should have diminished the peak and width of interproximal preparation required.

My preparation sequence is proven in Figures 1-12.

Determine 11 exhibits what the tooth will appear to be from the occlusal after Figures 1-10 are full.

Now you solely want to organize the world proven in inexperienced on Determine 12 to complete the preparation.

Sharp burs

It doesn’t take lengthy for a chunk of tooth, or outdated restorative materials to get caught between the diamond grits in a bur.

Put together enamel with a brand new, or almost new bur. It will make the reducing extra environment friendly, scale back appointment occasions, and scale back the warmth you transmit to the pulp, decreasing the chance of pulpal problems.

Good retraction and good imaginative and prescient

In an effort to put together a easy margin it is advisable see the margin. That is tough if there’s blood, saliva or gingiva encroaching in your margin.

Do your finest to regulate these through the use of retraction wire, haemostatic brokers, or presumably even surgical procedure (electrosurgery, or crown lengthening surgical procedure) to present you a transparent, clear subject.

Good retraction and moisture management will even help in your impression taking.

Magnification and good lighting are important. If I’m not carrying my loupes and my mild, I really feel as if I would as effectively put together the tooth with my eyes closed.


I hope you loved this month’s column, and, as at all times, please get involved when you have any questions.

Please hold the questions coming for the Prosthodontips staff. You possibly can contact us on Instagram (@sharplingdental and @prostho_zo) and in addition electronic mail ([email protected]).

If there are particular subjects you prefer to us to cowl in a column, please tell us.

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