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E-Max Crowns – A Detailed Overview

Friday, September 8th, 2017

Natural aesthetic rendition is a key aim of restoring teeth with full-coverage crowns. Therefore, an ideal dental material for the fabrication of crowns would allow the control of substrate colour and translucency.

Traditional metal ceramic crowns exhibit a lack of light exchange with the surrounding soft tissues caused by the reflection of their metal frameworks and their opaque layers.

Thus, they often present a compromised aesthetic appearance compared to natural teeth.

With the increased demand for aesthetics, all-ceramic restorations have become very popular over the last decades.

Such restorative all-ceramic systems must fulfil biomechanical requirements and should provide longevity like metal ceramic restorations while providing enhanced aesthetics.

Advancements in ceramic material science have resulted in more enhanced physical properties of modern ceramics, leading to a significant increase in the clinical use and practice of all-ceramic restorations.

Lithium disilicate glass ceramic material has been introduced by Ivoclar Vivadent (Amherst, N.Y.) for use in all ceramic restorations.

Introduced in 2005, this material is available as an ingot that can be processed using either lost-wax hot pressing techniques or press-fit (IPS e-max Press, Ivoclar Vivadent) and as a block that can be milled with computer-aided design/computer-aided manufacturing (CAD/CAM) technology (IPS e-max CAD, Ivoclar Vivadent).

Per the manufacturer, it combines high flexural strength along with optimal aesthetics and recommends its use for anterior or posterior crowns, implant crowns, inlays, onlays or veneers.

The e-max/lithium disilicate glass ceramic system, whether CAD/CAM processed or heat-pressed, is indicated either as a full-contour (monolithic) restoration or as a core for subsequent porcelain veneering.

The range of indication is supposed to include anterior and posterior teeth. IPS e-max Press not only can be used as a core material with aesthetic layering but also allows ceramic crowns to be fabricated fully anatomical without the need for veneering (staining technique).

Recent 2-years clinical study on full-contour e-max crowns have shown favourable results in terms of structural integrity, with no mechanical failures such as fracture or chipping. In harmony with these clinical findings, 2-mm-thick full-contour molar crowns of IPS e-max CAD subjected to sliding contact fatigue-testing have demonstrated significantly higher reliability than porcelain-layered yttrium oxide partially stabilised tetragonal zirconia polycrystalline (Y-TZP) crowns.

Although the clinical results are promising, occlusal clearances of less than 2 mm may reduce the reliability of full-contour e-max crowns. This issue necessitates further investigation. In addition, the use of veneering porcelains to improve aesthetics would need a reduction in core thickness that could also limit crown mechanical performance in the posterior region.

Since metal ceramic crowns are generally considered the “gold standard”, and Y-TZP restorations are of significant interest for clinical use, both materials should be compared with e-max/lithium disilicate crowns.

Considering these, in a recent study it has been proved that the reliability of reduced-thickness monolithic lithium disilicate crowns is higher when compared with that of Y-TZP and at least comparable with those of metal-ceramic systems. Moreover, clinical results for lithium disilicate crowns are promising, but longer observation periods and comparison between monolithic and multilayer systems are still required and should be approached with caution.

The Difference Between Preventative and Cosmetic Fields of Dentistry

Friday, September 8th, 2017

The field of dentistry has grown in leaps and bounds over the years. This is because of development in technology which has made it possible for dentists to provide fantastic care to their patients with all sorts of issues. It is worth pointing out that dentistry is no longer a small part of medicine. It is huge with many different branches. Some of the most popular branches of dentistry include preventative and cosmetic dentistry. They are the most practiced types of dentistry.

The interesting thing about these two branches is that they are different yet so similar. Preventative dentistry focuses its efforts on ensuring that patients do not suffer from problems related to dental loss, trauma, and damage. Cosmetic dentistry, on the other hand, is all about the restoration of lost dental function. It could be for the purposes of aesthetics mainly but it also helps when it comes to restoring the function of the teeth, jaws, mouth, and face in general. Either way, the tools and solutions that are used in both branches are likely to be the same.

Preventative dentistry

Preventative dentistry covers within its care and maintenance of the teeth with the aim of evading dental health issues. At its most basic level, it is a practice that involves care for the teeth so as to keep them healthy. It is with preventative dentistry that patients are able to avoid conditions like gum disease, enamel wear, cavities and others issues that compromise the strength and performance of the teeth.

It is worth mentioning that in preventive dentistry is also concerned with dental diseases like periodontal disease, gingivitis, scurvy and even tooth sensitivity. These are not hard to prevent but they can be tricky and distressing conditions if they set in. Preventative dentistry can help to prevent these conditions.

Cosmetic dentistry

Cosmetic dentists generally work with the aim of improving the appearance of the teeth and gums as well as the bite of their patients. The function is not always at the forefront of the list of objectives. However, it is also part of the options. If you are having issues with position, shape, colors, size, alignment of teeth and their overall appearance, then you might want to go for cosmetic dental solutions.

These are sometimes the minor enhancements that people would not notice in an instance but they go a long way in boosting the confidence and self-esteem of the individual. You can have missing teeth replaced easily nowadays. Are your teeth discolored? That can be fixed as well! There is practically nothing that you cannot do with cosmetic dentistry as far as correction is concerned.

Conclusion

Preventative and cosmetic dentistry are very different yet so alike. They serve the same objective- to keep the teeth healthy and give the patient a beautiful smile. The only difference lies in their methods and the time they are implemented. Preventive dentistry is more of a precaution against dental issues while cosmetic dentistry provides solutions to dental problems.