Two-year clinical performance of cast post and core self-adhesive cementation

Introduction and Objective: Endodontically treated teeth commonly present extensive tissue loss, requiring the use intraradicular posts, which provide retention for a coronal rehabilitation. Cast post and cores (CPCs) have been traditionally used in cases of marked tooth tissue loss. Case report: This case report describes two cast post and cores and subsequent rehabilitation by metal ceramic crowns. The patient was followed-up at intervals of 12 and 24 months after the rehabilitation. The posts were cemented within the root canal with self-adhesive resin cement, in a way that guarantees a perfect sealing of the root and remains stable in the oral environment. Conclusion: Self-adhesive cements are a one-step material capable of providing additional chemical adhesion to the metal, creating a monoblock, quality not found in conventional resin cements, where the adhesion occurs only in the dentin-cement interface.Introduction and Objective: Endodontically treated teeth commonly present extensive tissue loss, requiring the use intraradicular posts, which provide retention for a coronal rehabilitation. Cast post and cores (CPCs) have been traditionally used in cases of marked tooth tissue loss. Case report: This case report describes two cast post and cores and subsequent rehabilitation by metal ceramic crowns. The patient was followed-up at intervals of 12 and 24 months after the rehabilitation. The posts were cemented within the root canal with self-adhesive resin cement, in a way that guarantees a perfect sealing of the root and remains stable in the oral environment. Conclusion: Self-adhesive cements are a one-step material capable of providing additional chemical adhesion to the metal, creating a monoblock, quality not found in conventional resin cements, where the adhesion occurs only in the dentin-cement interface

Linear dimensional stability of irreversible hydrocolloids with and without disinfection at different storage times

Irreversible hydrocolloids have been used in dental practice for decades and their pouring time has been suggested to be as short as possible; however the latest generation of alginates exhibit better properties, which could influence the fidelity of the casts. Objective: To evaluate the linear dimensional stability of stone casts obtained using two irreversible hydrocolloid brands (Cavex ColorChange and Jeltrate) after disinfection. Material and methods: Samples were divided into 16 groups (n = 10) according to brand, storage time and disinfection. Impressions were taken of a metallic master model made of stainless steel with two abutments. Cast models were obtained using type IV gypsum, after disinfection with sodium hypochlorite at 1% or without any disinfection followed by storage for four different times (immediate pouring, and after 24, 72 or 120 hours storage after obtaining the impressions) and the models were measured with a digital caliper. Data were submitted to ANOVA 3-way followed by Tukey’s test (α 0.05). Conclusion: Storage longer than 24 hours affects the fidelity of casts. Disinfection does not promote significant alteration at any of the experimental times with either material.Irreversible hydrocolloids have been used in dental practice for decades and their pouring time has been suggested to be as short as possible; however the latest generation of alginates exhibit better properties, which could influence the fidelity of the casts. Objective: To evaluate the linear dimensional stability of stone casts obtained using two irreversible hydrocolloid brands (Cavex ColorChange and Jeltrate) after disinfection. Material and methods: Samples were divided into 16 groups (n = 10) according to brand, storage time and disinfection. Impressions were taken of a metallic master model made of stainless steel with two abutments. Cast models were obtained using type IV gypsum, after disinfection with sodium hypochlorite at 1% or without any disinfection followed by storage for four different times (immediate pouring, and after 24, 72 or 120 hours storage after obtaining the impressions) and the models were measured with a digital caliper. Data were submitted to ANOVA 3-way followed by Tukey’s test (α 0.05). Conclusion: Storage longer than 24 hours affects the fidelity of casts. Disinfection does not promote significant alteration at any of the experimental times with either material

Evaluation of the color stability of different temporary restorative materials

This study aimed to evaluate the color stability of different temporary restorative materials in contact with staining solutions, as well as to verify which one presents the highest resistance to staining. In this laboratory study, five types of temporary restorative materials were evaluated: self-curing acrylic resin, bis-acrylic resin, light-curing acrylic resin, CAD/CAM machinable, and 3D printed resin. Thirty samples of each material were produced in a circular mold measuring 10 mm diameter and 2 mm thickness. The materials were divided into subgroups (n=10) and immersed in solutions: Coffee, Coca-cola®, and distilled water (control). Color measurements were carried out at baseline, 1, 7, and 14 days using a digital spectrophotometer and the color parameters were calculated according to the CIEDE00 system. The color change data were subjected to two-way ANOVA (temporary material vs time) and post-hoc Tukey test (α = 0.05). The materials showed a color change only comparing baseline vs. one day, according to acceptability standard ΔE00 > 1.8. Thus, we concluded that there was a difference in color stability already on the first day of immersion. In addition, the coffee solution showed the highest color variation when compared to the other solutions. Clinical applicability: Temporary restorations are widely used in prosthetic treatments and can remain in the mouth for a considerable period. They are responsible for aesthetic and function maintenance along the rehabilitation process. In addition, they provide data for the definitive prosthesis and should assure comfort and confidence to the patient.  Thus, it is necessary that these materials are resistant and present such color stability that does not compromise the aesthetics during the treatment phase

In vitro fracture resistance and bond strength of self-adhesively luted cast metal and fiber-reinforced composite posts and cores : influence of ferrule and storage time

To evaluate the fracture resistance and bond strength of cast posts and cores (CPCs) and customized glass fiber posts (CFPs) with self-adhesive luting. A total of 56 recently extracted premolars were divided into four groups for the fracture resistance test (CPC and CFP, with and without ferrule) and four groups for the bond strength test (CPC and CFP, immediate and 6 months of storage). Differences for fracture resistance were found between CPCs and CFPs with ferrule. For bond strength, the interaction between post and root region was significant. Self-adhesive luting increased fracture resistance of CPCs with ferrule. The ferrule decreased root fractures. Bond strength was similar for both retainers but not for the apical third. Water storage affected bond strength positively32220520

Transitional Era: from analogical to digital workflow in oral rehabilitation: a case report

ABSTRACT Digital dentistry is a ubiquitous phenomenon nowadays but it requires access to technologies and learning curve. To aid digital workflow implementation, digital steps can be progressively incorporated in conventional workflows. We aimed to demonstrate a multidisciplinary oral rehabilitation performed mixing conventional procedures with digital open-source software programs and low-cost devices. A 46-year-old female patient had photographs, intraoral scans, and cone-beam computed tomography obtained and used in combination with conventional clinical exams to develop a treatment plan. Power point software was used for digital smile planing and Horos for digital implant planning. The digital dataset were used to guide conventional clinical procedures (scaling and root planning, gingivoplasty, in-office tooth bleaching, fiber-post restoration, implant and bone graft placement, teeth preparation, and protheses design and milling). The inclusion of digital steps in the conventional workflow enabled the performance of rehabilitation procedures with reduced clinical time and increased predictability, favoring the overall workflow and the communication among the different dental specialties. A mixed workflow can progressively lead to an exclusively digital workflow as technologies become accessible and learning curve is coped