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  3. Investigating the fracture resistance of endodontic teeth with different types of crown and root restorations

Investigating the fracture resistance of endodontic teeth with different types of crown and root restorations

Number of pages: 89 File Format: word File Code: 32040
Year: 2013 University Degree: Master's degree Category: Medical Sciences
Tags/Keywords: Composite resin - Dental treatment - Fiber post - Fracture of endodontic teeth - resin cement - Resistance to failure - Rooted treated teeth - tooth restoration
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  • Summary of Investigating the fracture resistance of endodontic teeth with different types of crown and root restorations

    Dissertation for receiving the degree of Doctor of Dentistry

    Dental Materials Research Center

    Abstract

    Aim: One of the objectives of this study was to investigate the resistance to fracture of teeth coated with various crown and root restorations.

    Materials and materials Methods: 60 freshly extracted human premolar teeth were selected and randomly divided into five groups of twelve. In 48 teeth, their crowns were cut 3 mm above the CEJ. Then the MOD cavities were cut to 3 mm dimensions in the buccolingual dimension and the gingival floor at the CEJ level. After the endodontic treatment, in the first group, pin number one of the same color as the tooth, approximately 8 mm long, was restored with Estelite Core Quick (Tokuyama) resin cement and the crown with Estelite Sigma Quick (Tokuyama) composite. In the second group, the root and crown were reconstructed with Tokuyama Bond Force adhesive and Estelite Sigma Quick light cure composite. In the third group, Master Dent (USA) self-cure composite and the adhesive included in its packaging were used for crown and root reconstruction. In the fourth group, Panavia F2.0 resin cement (Kuraray) was used to cement the posts, and the tooth crown was repaired with Clearfil AP-X composite (Kuraray). In the control group (group 5), the teeth remained intact. The samples were kept in distilled water at 37°C for 24 hours, then the samples were subjected to 1000 thermal cycles and mounted in acrylic resin. The samples were placed in the universal test machine at a speed of 1 mm per minute for the fracture resistance test. The values ??of fracture resistance and the mode of failure of the samples were recorded. The data were statistically analyzed with ANOVA, Tukey and Fisher's Exact tests (P < 0.05). Findings: The fourth group had the highest and the third group had the lowest resistance to failure. It was found that there is a significant difference in the average values ??of resistance to failure of the test groups (P<0.05). There were significant differences in the average values ??of fracture resistance between groups 4 and 5 with other experimental groups (P<0.05). There was no significant difference in fracture resistance of groups 1, 2, 3 (P>0.05).

    Conclusion: For root canal treatment teeth, root reconstruction with clear post and Panavia resin cement and making a crown with optical resin composite increased the fracture resistance of teeth to the level of healthy teeth.

    Keywords: fracture resistance, fiber Post, resin cement, resin composite

    First chapter

    Review of texts and articles

     

     
     
     

     

    Introduction

             Treatment of root-treated teeth whose crown structure has suffered severe destruction has always been considered. To restore such teeth, patients and dentists have been looking for a method that has more durability and survival and is exempt from exorbitant costs and complicated procedures. Today, many dentists prefer the use of prefabricated post systems because they are more practical, less expensive, and in some cases more conservative than cast posts and blinds.

    In severely degraded roots, an adhesively bonded fiber post may improve fracture toughness and provide better stress distribution and transfer, thus strengthening the tooth.

    Among the methods of restoring endodontic teeth, using post and blind casting, prefabricated posts, crown build-ups with the help of restorative materials such as amalgam, composite, etc. Of course, each has its advantages and disadvantages. Due to the wide use of this type of treatment, and considering that most of the canal filling material (gutta-percha) is drained to create the post space, and there is also the possibility of sub-canals, and the remaining gutta-percha in the apical part of the canal cannot provide the necessary flood for the canal, it is important and necessary to create a flood by means of post and blind materials and adhesive material.

    Bonding between cement and post is always one of the problems of cementing posts. It seems that by using a composite instead of a cemented post, one of the bonding interfaces is removed, and the bonding issue is only postponed to the adequacy of the bond between the teeth/adhesive/composite, and also the problem of high C-factor during cementing the posts is eliminated. If we imagine that actually one of the main causes of failure in restorative treatments is the reduction of tooth fracture resistance and restoration, so the purpose of this study is to investigate the fracture resistance of endodontic teeth with different methods of crown and root restoration. rtl;"> 

    general

    resin composite

            Composite is a physical mixture of different materials to obtain an average of the desired properties of these materials. Following efforts to improve the properties of unfilled acrylic resin, Bowen in 1962 developed a polymer restorative material reinforced with silica particles. This material became the basis for the materials that today are called composite resin and is the most common tooth-colored restorative material (1 and 2). Composite resins were introduced in 1960 as a combination of inorganic fillers (hard) bonded with dimethacrylate (soft) polymer. so that their physical characteristics were close to the characteristics of ivory and enamel. Their improvements include light curing, bonding to tooth components, reducing wear, and so on. and even their progress has led to the fact that they are now also used in posterior conservative restorations (2). Construction of composites. The components of today's composites include resin matrix (organic ground) or continuous phase, filler particles or dispersed phase (inorganic), bonding agents (intermediate layer) (Silan) and other factors (1 and 3). which we will examine:

    Organic part (Organic matrix=continuous phase)

    The organic matrix phase includes the following compounds:

    Monomer: The main monomer used in most composites is Bis, GMA
    It was introduced by Bowen in 1957, and from its polymerization, a cross-linked polymer is created, which is an exothermic reaction. Compared to acrylic resins, these polymers are harder and have less shrinkage. Another monomer used is UDMA, which is a modified version of Bis GMA. UPMA-Bis-GMA has a high molecular weight and therefore low fluidity at room temperature, so diluting monomers must be added to it.

    (b Diluent: To increase the fluidity of UDMA-Bis-GMA monomers, diluting monomers such as triethylene glycol dimethacrylate (TEG-DMA) and methyl acrylate (MMA) are added to them. Nowadays, in some composites, aromatic di Methacrylate is used as the main monomer, which has good fluidity and does not need a diluent (4 and 2). - Filler (Filler)

    It decreases (4.2). The type, size of particles, distribution rate, refractive index and hardness of filler are factors that affect the properties of the composite.

  • Contents & References of Investigating the fracture resistance of endodontic teeth with different types of crown and root restorations

    List:

    Title.. page

    Persian summary.. 1

    Chapter one: Review of texts and articles

    Introduction.. 2

    Overview.. 4

    Resin composite.. 4

    Construction of composites.. 5

    Classification of composites.. 8

    Properties of composites.. 10

    Mechanical properties.. 12

    Fiber post.. 14

    FRC post.. 15

    Advantages of FRC post.. 18

    Effective factors in choosing posts. 19

    Resin cements.. 26

    Uses.. 27

    Physical properties.. 29

    Dentin adhesive materials.. 35

    Fracture resistance.. 38

    Measurement of fracture resistance.. 40

    Chewing forces and stress.. 42

    A review of articles.. 43

    Chapter two: materials and methods

    Consumable materials.. 59

    Method of project implementation.. 60

    Chapter three: findings

    Findings.. 67

    Description of experimental groups.. 69

    Chapter four: discussion

    Discussion.. 74

    Chapter Five: Conclusion

    Conclusion.. 81

    Resources.. 82

    Abstract

    Source:

    References:

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Investigating the fracture resistance of endodontic teeth with different types of crown and root restorations
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