11/13/2023 0 Comments Peek material in dentistry![]() Endocrowns have been reported to provide sufficient intention stability and greater fracture resistance. Its advantages include sealing the root canal and preventing the risk of recontamination. An endocrown restoration is a monolithic restoration that utilizes the pulp chamber and remaining coronal tooth structure as a means of retention. With the emphasis on minimally invasive concepts and progress made in adhesive dentistry, endocrown restorations have been introduced as an alternative option for rehabilitating ETT. ![]() Although satisfactory results have been achieved with crowns supported on post and cores over the years, this process has been revealed to weaken the mechanical resistance of the tooth structure, and to increase the incidence of root fracture. The decision regarding how to restore endodontically treated teeth (ETT) with extensive coronal loss remains a clinical challenge. Composite resins (GR and VC) exhibit a more even stress distribution, and seem to be more promising materials for endocrown molars. ConclusionsĪn endocrown with a 20° bevel margin design could be a favorable preparation option for ETT. In contrast, materials with an elastic modulus similar to that of dentin presented with a more homogeneous stress distribution on the whole structure. Restorative materials with higher elastic moduli present higher stress concentrations inside the endocrown and transmit less stress to the cement layer, resulting in lower bonding failure risks. The stress concentrated on the dentin was significantly lower in Model B with a 20° bevel margin (20.86 MPa), i.e., 1.3 times lower than the other three margin designs (27.80 MPa). Model D (with an anatomic margin) showed the greatest stress concentrations, especially in the irregular and sharp angles of the restoration and tooth remnants. ![]() The failure risk of the cement layer was also calculated based on the normal stress criterion. The results for the endocrown and tooth remnants were determined according to the von Mises stress. The Load application (600 N) was performed at the food bolus and tooth surface during the closing phase of the chewing cycle. The following endocrown materials were used: In-Ceram Zirconia (Zr), Vita Suprinity (VS), IPS Empress (IE), Grandio blocs (GR), VisCalor bulk (VS), and CopraPeek Light (CP). Model D was prepared with an anatomic margin and received an endocrown with a 2.0-mm occlusal thickness. Model C was prepared with an axial reduction and 1-mm shoulder margin and received an endocrown with a 2.0-mm occlusal thickness. Model B was prepared with a 20° bevel margin and received an endocrown with a 2.0-mm occlusal thickness. Model A was prepared with a flat butt joint margin and received an endocrown with a 2.0-mm occlusal thickness. Methodsįour 3D-finite elements models were constructed for endocrown restored molars considering different margin designs. ![]() This study aimed to evaluate the stress distributions in endocrown restorations as applied to endodontically treated teeth (ETT), according to the factors of “margin design” (four levels) and “restorative material” (six levels). ![]()
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