Marginal fit of monolithic versus layered zirconia crowns assessed with 2 marginal gap methods.

Statement Of Problem: Zirconia can be used either monolithically or veneered with porcelain. However, whether veneering zirconia affects marginal fit is unclear.

Purpose: The purpose of this in vitro study was to evaluate the marginal fit of the monolithic and layered zirconia prostheses using 2 different assessment methods.

Fracture Resistance of Zirconia Restorations with Four Different Framework Designs.

This study assessed the fracture resistance of zirconia crowns with four framework designs, fabricated by computer-aided design/computer-aided manufacturing (CAD/CAM) technology. In this experimental study, a maxillary central incisor was prepared and scanned with a CAD/CAM scanner, and 40 frameworks with 4 designs (N=10) were fabricated as follows: simple core, dentine core with a design similar to dentine, 3mm trestle design collar in the lingual aspect with proximal buttresses, and monolithic or full-contour. After porcelain applying and 20h immersion in distilled water (37°C), crowns were cemented on metal dies using zinc phosphate cement.

Color match of ultra-translucency multilayer zirconia restorations with different designs and backgrounds.

Purpose: The purpose of this in vitro study was to assess the color match of ultra-translucency multilayer zirconia restorations with different designs and backgrounds.

Materials And Methods: Thirty ultra-translucency multilayer zirconia crown specimens were made in VITA classical shade B2 for a prepared maxillary central incisor. The specimens were divided into three groups based on the restoration design: veneered zirconia with a trestle design (VZT), veneered zirconia with a dentin core design (VZD), and full-contour zirconia (FCZ).

Tensile Bond Strength and Retention of Three Types of Ceramic Endocrowns.

Statement Of The Problem: By development of adhesive dentistry and noble mechanical strength of ceramics, reconstruction of posterior teeth with partial coverage restorations such as ceramic endocrowns is possible. Different ceramics may show different mechanical properties which should be investigated.

Purpose: The aim of this experimental study was to compare the tensile bond strength of endocrowns made by CAD-CAM using 3 types of ceramics.

External versus Endoscopic Dacryocystorhinostomy for Primary Acquired Nasolacrimal Duct Obstruction.

Purpose: The purpose of the study is to compare the surgical outcomes and success rates of external dacryocystorhinostomy (EX-DCR) versus endoscopic endonasal DCR (EN-DCR) for the treatment of primary acquired nasolacrimal duct obstruction (PANDO).

Methods: This retrospective nonrandomized study was conducted at Farabi Eye Hospital and Noor Eye Hospital, Iran. A review of electronic medical records of all patients with PANDO who underwent EX-DCR or EN-DCR between January 2016 and 2018 was carried out.

The wound healing effect of collagen/adipose-derived stem cells (ADSCs) hydrogel: In vivo study.

Background: The complex wound healing process involves activating and synchronizing intracellular, intercellular, and extracellular components. Adipose tissue is attracting attention to promote wound healing. Within subcutaneous adipose tissue, stromal vascular cells and their subsets release growth factors and cytokines critical for neovascularization and wound repair.

The Role of Biomaterials and Biocompatible Materials in Implant-Supported Dental Prosthesis.

The dental implant is one of the appropriate instances of the different dental materials and their application, which is the combined procedure of technology and science in physics, biomechanics, and surface chemistry from macroscale to nanoscale surface engineering and manufactured technologies. In recent decades, biomaterials in implant therapy promote bone response and biomechanical ability, which is long-term from surgical equipment to final prosthetic restoration. Biomaterials have a crucial role in rehabilitating the damaged structure of the tooth and supplying acceptable outcomes correlated with clinical performance.

Shear Bond Strength of Zirconia Ceramic to Four Different Core Materials, An Study.

Statement Of The Problem: Different materials can be used to reconstruct the core foundation in all-ceramic restorations. Bond strength of the core material to zirconia is an important factor in long-term restoration success.

Purpose: The aim of this study was to assess shear bond strength (SBS) of zirconia to four different core materials.

Effect of Different Nd:YAG Laser Power Outputs on Bond Strength of Resin Cement to Zirconia in Comparison to Sandblasting.

This study investigated the effect of various laser powers on the shear bond strength (SBS) of resin cement to the zirconia surface. Seventy-five zirconia disks were prepared and assigned to five groups including no surface treatment (control group), sandblasting with 50 µ Al O particles (second group), and Nd:YAG laser treatments with 2 W, 2.5 W and 3 W powers respectively (third, fourth and fifth groups).

Effect of Cement Type and Cementation Technique on the Retention of Implant-Supported Restorations.

Objectives: This study aimed to assess the effect of cement type and cementation technique on the retention of cement-retained implant-supported restorations.

Material And Methods: In this in vitro study, 20 solid abutments were screwed onto the fixture analogs and were mounted in acrylic resin molds using a surveyor. Twenty computer-aided design/computer-aided manufacturing (CAD/CAM) metal crowns with an occlusal loop were fabricated, divided into two groups (n = 10), and bonded with temporary dental cement (Temp-Bond™; group 1) or glass ionomer (GC; group 2).

Effect of multiple pouring on the accuracy of casts made using 3D-printed custom trays with different spacer thicknesses: A research study.

This study aimed to evaluate the effect of different pouring times and spacer thicknesses on the three-dimensional accuracy of casts made of 3D-printed custom trays. A partial edentulous maxillary model was scanned for fabricating custom acrylic trays. Twenty custom trays were created using a CAD/CAM system and divided into two groups in terms of their spacer thicknesses (2 mm and 4 mm).

Influence of Different Surface Treatments on the Shear Bond Strength of Resin Cement to Base Metal Alloys.

This study aimed to investigate the effect of different surface treatments on the bond strength of resin cement to nickel-chrome (Ni-Cr) alloy. Forty disk-shaped specimens of Ni-Cr alloy were prepared and divided into 4 groups. In the first group, the specimens' surface was sandblasted with 50 µ Al2 O3 particles.

Clomiphene citrate versus letrozole with gonadotropins in intrauterine insemination cycles: A randomized trial.

Background: Clomiphene citrate is one of the effective drugs for infertility treatment due to oligo-ovulation or anovulation. Intrauterine insemination (IUI) is one of more adherent methods for treatment of infertile cases which is followed by controlled ovarian hyperstimulation (COH).

Objective: the aim of this study was to evaluate Clomiphene citrate versus letrozole with gonadotropins in IUI cycles.

Comparison of marginal bone loss and patient satisfaction in single and double-implant assisted mandibular overdenture by immediate loading.

Purpose: The purpose of this study was to compare the coronal bone level and patient satisfaction in 1-implant and 2-implant assisted mandibular overdentures.

Materials And Methods: Twenty patients who had maladaptive mandibular dentures were treated in this study. Patients were randomly divided into two groups.

Tear function evaluation in candidates of corneal laser refractive surgery for myopia.

Objective: To assess the tear function in a young to middle age myopic population and finding possible associations of abnormal tear function with gender and age.

Methods: Dry eye workup was conducted in patients undergoing screening for myopic laser keratorefractive surgery. All patients completed the McMonnies dry eye questionnaire (MQ) and also underwent evaluation of the fluorescein break-up time (FBUT) and the Schirmer tests with anesthesia (STA).

Presence of fusion in albinism after strabismus surgery augmented with botulinum toxin (type a) injection.

It is commonly accepted that albino patients with strabismus rarely achieve binocularity and depth perception after strabismus surgery. The presence of retino-geniculo-cortical misrouting, a hallmark of the visual system in albinism, does not necessarily cause total loss of binocular vision, however, not even in albino patients with strabismus. Recently some degrees of stereopsis were reported in albinism patients with minimal clinical nystagmus, if any, in the absence of strabismus.

Orbital dirofilariasis in Iran: a case report.

Dirofilariasis is a common parasitic disease in both domestic and wild animals around the world, with canines as the principal reservoir host and mosquitoes as the vector. Human ophthalmic dirofilariasis is an uncommon condition, but there have been reports from many parts of the world, including Africa, Australia, the Americas, Europe, and Asia. Ophthalmic involvement with Dirofilaria may present itself as periorbital, subconjunctival, orbital, or intraocular infections.

Inflammation and pruritus in hemodialysis patients.

Pruritus is a common problem in dialysis patients. The aim of this study was to determine the cause(s) of pruritus and its relationship with inflammatory proteins. In a cross sectional study, all patients on hemodialysis at the Emam Khomaine and Sina Hospital, Tehran, Iran who did not have any pruritus-producing skin lesions were studied.