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As a result, adhesive luting can be generally used in every clinical situation, whereas conventional cementation is limited Table 3. For full-coverage restorations with preparation designs featuring at least some mechanical retention, the use of self-adhesive resin cements can be considerate a good alternative as it provides high clinical success rates 9,

A guideline with regard to contemporary materials The retention of the fixed prosthodontic restorations is a critical factor for the long-term success, as the loss of crown retention is one of the main reasons for failure of crowns and fixed dental prosthesis FDP 1, 2.

Время, видимо, бежало быстрее, чем казалось Олвину.

There are three main elements that need to be considered to achieve proper retention of the restorations; the tooth preparation, the restorative material and the luting agent. Retention form is responsible for counteracting tensile stresses, whereas resistance form counteracts shear stresses 4.

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In order to achieve a sufficient retention and resistance form for full coverage crowns it is recommended that the height of the abutment tooth should be at least 4 mm and that the optimal convergence angle should range from 6 to 12 degrees with a maximum of 15 degrees 1, Proper luting of indirect restoration is critical in achieving long-term success as it highly influences the retention of the restoration as well as tightly sealing the gap between the restoration and the tooth.

Although there are several classifications for the definitive luting agents, they can behowever, classified into two main categories based on the ability to achieve chemical connection to different substrates; conventional e.

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Most commonly used and best documented adhesive luting agents are the adhesive composite resin cements. Composite resin cements can be further classified according to the chemical composition into traditional full-adhesive resin cement and self-adhesive resin cements, both also differ in the bonding procedure.

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The full-adhesive resin cements require pre-treatment of the tooth structure and restorative material using separate adhesive systems. In this combination of the resin cement and the adhesive system, very durable chemical bonding can be reached.

To simplify the luting procedure and eliminate the multi slim onde compar of using several components, the self-adhesive resin cements are a good choice for the daily busy practice, in which reliable bonding can be achieved in only one simple step of cement application, mostly without additional primers or bonding agents. With the availability of different types of cements, the decision of choosing the suitable luting agent and method can be confusing for the practitioner.

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Especially with the wide use of contemporary restorative materials such as new generations of highly translucent zirconia as well as reinforced-composites, it is important to take into consideration that the properties of such materials differ highly from metal or earlier generations of zirconia. Subsequently the choice of the luting agent must be appropriate to achieve satisfying results and long-term success.

Therefore, in this article, the authors aim to provide insights for the clinicians on choosing the correct luting agent that can help achieve satisfactory results for the dentist as well as the patients. The choice of whether to use a conventional cement or an adhesive resin cement depends on several factors, the key factors are: Retention and resistance form of the abutment tooth.

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Mechanical and optical properties of the restorative material flexural strength and translucency. Simplicity of the workflow and special requirements of the working environment. In this case the only possible method to achieve retention is the adhesive luting Even though such preparations completely lack a retentive form, long-term success of the restorations is well-documented when using a durable resin cement e.

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For full-coverage restorations e. However, in reality this retention form is hard to realize due to several factors. In cases of severe loss of tooth substance, achieving a minimum height of the abutment tooth is only possible with building up the tooth using a core build-up material which in some cases can be considered time consuming especially when the required build-up is minor for example mm.

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Moreover, increasing the height through core build-up is sometimes not possible, as in cases with short clinical crowns and insufficient occlusal clearance that is essential to provide the minimum thickness required for the restorative material. In such cases surgical crown lengthening is necessary to increase the height of the tooth without compromising the occlusal space required, which can be time consuming for the clinician and undesirable for the patient as it involves a surgical procedure and extends the treatment process.

Concerning the convergence angle, several studies showed that in reality and in daily practice of the dentist, the preparation angle is much higher than 15 degrees 5, 6, 12, For instance, preparations from general practitioners were evaluated digitally and compared to clinical recommendations and it was found that the mean convergence angle was Based on the previous concerns, it can be concluded that achieving a proper retention form during daily practice is hard to realize and thus conventional cementation in such cases can present clinical problems especially on the long term.

Но в момент, когда сердце тосковало по недосягаемому, он сделал свой выбор. Теперь он знал, как собирается поступить со своей От Джезерака помощи было мало, хотя его готовность к сотрудничеству превзошла тайные ожидания Элвина. За долгую карьеру наставника Джезераку не раз задавали подобные вопросы, и он не верил, что даже уникум вроде Элвина способен создать излишние неожиданности или поставить перед ним неразрешимые По правде говоря, в поведении Элвина начала проявляться некоторая эксцентричность, могущая впоследствии потребовать исправления. Он не столь полно, как следовало бы, погружался в невероятно изощренную социальную жизнь города или в фантастические миры своих друзей.

Therefore, adhesive luting can be recommended in these cases as an alternative to conventional cementation 6, For full-coverage restorations with preparation designs featuring at least some mechanical retention, the use of self-adhesive resin cements can be considerate a good alternative as it provides high clinical success rates 9, For non-retentive minimal-invasive restorations, traditional full-adhesive luting is a must.

For full-coverage restorations, full-adhesive or self-adhesive luting is recommended. In case a retentive preparation with minimum height of 4mm and convergence angle of degrees, adhesive luting as well as conventional cementation can be used.

This includes feldspathic- glass- hybrid-ceramics and composite. Although discussions on conventional cementation versus adhesive luting for high-strength multi slim onde compar with flexure strength of more than MPa have been going on for a long time 9there are several studies showing an increased stability and strength of all types of ceramics, even lithium disilicate and zirconia, when they are adhesively luted 9, It is also important to consider that the documented success of most conventional cements is mainly combined with restorations made of metal or early generations of zirconia.

Nonetheless, the clinical success of new generations of high-translucent zirconia can be significantly influenced by the luting agent as these new generations have notably lower flexural strength 9.

And therefore, attention has to be paid to minimal material thickness together with adhesive luting to ensure long-term clinical success and prevent fractures 9. For glass-ceramic, hybrid-ceramics and composites, adhesive luting is a must.

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For lithium disilicate and zirconia restorations, adhesive luting is highly recommended. For metal restorations, adhesive luting as well as conventional cementation can be used.

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This includes not only new restorative materials but also new modifications to the luting agents as well. Highly translucent ceramics can deliver superior esthetics and therefore their popularity and clinical applications expanded widely among clinicians.

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It is nevertheless very important for the clinician to apprehend that the final esthetic result is influenced by the complete restorative complex and not just by the restorative material, as the luting agent is a key factor in achieving the desired high esthetics For that reason, the choice of an opaque conventional cement for cementation of high-translucent restoration should not be recommended as it can negatively influence the final esthetic results.

Therefore, composite resin cements are the material of choice, as they are available in different shades and translucencies for the clinician to be able to choose the suitable resin cement to achieve the desired esthetics based on the restorative material and thickness as well as the color of the underlying abutment. Some composite resin cements offer try-in paste so that the clinician and the patient can visualize the final results before luting and therefore better choose the appropriate shade of the resin cement.

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For metal and opaque high-strength zirconia restorations, adhesive luting as well as conventional cementation can be used. These procedures are technique sensitive and intolerant to contaminations, therefore the luting process needs a dry oral environment avoiding any contamination, such as saliva or blood, preferably using rubber dam, as any contamination can compromise the bond strength.

Therefore, inability to maintain dry field as in case of subgingival preparation margins is considered a contraindication for traditional full-adhesive luting.

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However, this method provides very durable bond strength, therefore it is the multi slim onde compar method of choice for minimal invasive non-retentive preparations, such as resin-bonded FDPs, labial and occlusal veneers and inlay-retained FDPs, in which the retention is mainly dependent on the adhesion Still, in everyday practice, clinicians seek efficiency and effectivity by using a multi slim onde compar but durable luting agent for the insertion of full-coverage restorations such as tooth-or implant-supported crowns and FDPs.

Although the conventional cements are simple and multi slim onde compar in their use, they provide little or no adhesion at all and therefore they are not recommended in several cases 6, multi slim onde compar, 14, 15, 19, A simple but reliable method can be well accomplished by the use of self-adhesive resin cements e.

Furthermore, self-adhesive resin cements are not as technique sensitive and intolerant to contaminations as traditional full-adhesive resin cements.

Typically, a MDP phosphate monomer is integrated in the self-adhesive resin cement, which is required to chemically bond to different substrates, making it possible for the resin cement to chemically bond to non-precious metals and zirconia as well as tooth substance.

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However, regardless of the self-adhesive resin cement, the use of a separate silane coupling agent is still required when bonding to silica-based ceramics e.

So the luting process can be in this case truly shortened to one step. Therefore, this unique cement combines several advantages of adhesive luting as well as the straightforward procedure of the conventional cementation without compromising the clinical success, regardless of the type of the restorative material.

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As a conclusion, adhesive luting has more benefits over conventional cementation, regarding retention, esthetics, stabilization of the tooth and the restoration as well kas sidrunid poletavad rasva preventing micro leakage 6, 9,19, 20, 25, 26 Table 1. Moreover, there are no absolute contraindications for adhesive luting other than hypersensitivity to methacrylate monomers, as self-adhesive resin cements can be used in cases where rasvaskaotus piibli pdf resin cements are contraindicated, such as inability to avoid contamination Table 2.

As a result, adhesive luting can be generally used in every clinical situation, whereas conventional cementation is limited Table 3.