Do effervescent vitamin tablets affect the surface roughness, microhardness, and color of human enamel and contemporary composite resins?

Purpose: To compare the impact of four effervescent vitamin tablets on the surface roughness, microhardness, and color of human enamel and contemporary composite resins.

Material And Methods: Sixty enamel and a total of 240 anterior (Gradia Direct Anterior), posterior (Gradia Direct Posterior), and universal composite resin (Filtek Ultimate) specimens (n = 60 per group) were fabricated. Each group was subdivided into five subgroups (n = 12, per subgroup).

Effect of Denture Cleansing Solutions on the Retention of Locator Attachments Over Time.

Purpose: To evaluate and compare the alterations in retention of three Locator attachments after immersion in various denture cleansers at defined time intervals.

Materials And Methods: Two implants were embedded in an acrylic block. Pink, blue, and clear Locator attachments (n = 10 for each subgroup) were immersed into three different cleansing solutions (Corega, Protefix and NaOCl) and tap water (control) at different time intervals that simulate 1 (T ), 6 (T ), and 12 (T ) months of clinical use.

Biomechanical Behavior of Implants with a Sloped Marginal Configuration.

Purpose: To evaluate the biomechanical behavior of implants with different neck designs.

Materials And Methods: Finite element models of implants with two different neck designs (OsseoSpeed EV and OsseoSpeed Profile EV) were generated. Implants and abutments were subjected to buccally and lingually directed 30-degree oblique loads of 200 N.

The Fracture Resistance of Composite Core Materials Reinforced by Varying Fiber Orientations.

This study aimed to compare the fracture resistance of composite core materials reinforced with varying fiber orientations. Composite cores of endodontically treated roots were prepared by reinforcing with woven fiber discs, fiber strips, or fiber chips, and their fracture resistance was compared to those with no reinforcement using a universal test machine (Instron, Lloyd Instruments). Reinforcement with fiber chips showed the highest fracture resistance and 50% retrievability, while no reinforcement showed the lowest fracture resistance with 62.

Effect of engraving speeds of CO₂ laser irradiation on In-Ceram Alumina roughness: a pilot study.

Objectives: The aim of the study was to determine the effect of CO₂ laser on surface roughness of In-Ceram-Alumina-ceramic.

Materials And Methods: Four aluminum-oxide ceramic disc specimens were prepared of In-Ceram Alumina. Discs received CO₂ laser irradiation with different engraving speeds (100, 400, 600 and 800 mm/min) as a surface treatment.

Intraoral use of extraoral implants for oral rehabilitation of a pediatric patient after resection of ewing sarcoma of the mandible and reconstruction with iliac osteocutaneous free flap.

Large osseous defects secondary to resection of the mandibular segment may lead to significant facial deformity, functional disabilities, and associated psychologic problems. The therapeutic approach is more complicated in pediatric patients because it must not interfere with normal craniofacial growth process. Here, we present a clinical report to emphasize the application of extraoral short implants with magnetic abutments used for mandible of a growing patient reconstructed with free iliac flap after resection of Ewing sarcoma.

Effect of preparation taper and height on strength and retention of zirconia crowns.

This study aimed to determine the effect of the taper and height of tooth preparations on the fracture strength and retention of zirconia crowns. Sixty-four dies were designed to simulate a crown preparation. Dies were machined with a height of either 4 mm (n = 16) or 7 mm (n = 16) and a taper of either 6 degrees (n = 16) or 20 degrees (n = 16).

Effect of repeated firings on microtensile bond strength of In-Ceram Alumina with two different veneering ceramics.

Microtensile bond strengths of In-Ceram Alumina cores veneered with two ceramics after different numbers of firing cycles were evaluated. After In-Ceram Alumina cores were fabricated, they were veneered with either Vitadur Alpha or Vita VM7. A control group of each core-veneer combination was fired twice, and a second group was fired five times to induce thermal fatigue.

Periauricular mold brachytherapy.

Purpose: We present a patient with recurrent basal cell carcinoma (BCCA) who was treated with custom-made mold brachytherapy.

Methods And Materials: The patient was admitted to the hospital with the complaint of recurrent BCCA of the auditory canal. He has previously treated by surgery and external beam radiotherapy.

Surface roughness and bond strengths of glass-infiltrated alumina-ceramics prepared using various surface treatments.

Objectives: To compare and evaluate effects of CO(2) laser and conventional surface treatments on surface roughness and shear bond strengths of glass-infiltrated alumina-ceramics to dentin.

Methods: One hundred fifty ceramic discs of In-Ceram Spinell, In-Ceram Alumina and In-Ceram Zirconia (n=50) were prepared. Specimens which were divided into 5 groups (n=10) were untreated (control group), sandblasted, airborne particle abraded, etched with 9.

An alternative post-and-core method for patients with limited interarch space.

Background: The authors describe a technique for placement of a three-unit posterior fixed partial denture where one abutment lacked sufficient interarch space.

Case Description: This method involves the use of a cast post and core with a precision attachment soldered into the core to provide the necessary retention and resistance. The prosthesis is retained by a combination of cement and screw retention.