Publications by authors named "Mohammad Hossein Dashti"
Article Synopsis
- The study explores using hydroxyapatite nanoparticles (nano-HA) to remineralize enamel and improve the effectiveness of dental sealants on noncavitated caries lesions.
- A total of 192 third molars were tested with various treatments combining nano-HA and sodium hexametaphosphate (SHMP), followed by sealant application, to assess their effects on sealant microleakage and shear bond strength (SBS).
- Results indicated that nano-HA significantly improved the shear bond strength compared to other treatments, especially at higher concentrations, though it did not have a significant impact on microleakage or the remineralization ratio of calcium to phosphate.
Purpose: To evaluate the effect of the application sequence of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) paste (MI paste) on shear bond strength (SBS) of 2 etch-and-rinse resin cements to dentin.
Materials And Methods: Sixty extracted human maxillary premolars were cut to expose the mid-coronal dentin surfaces. The teeth were randomly divided into 6 groups (n = 10), based on the resin cement used and CPP-ACP application.
Purpose: To evaluate the influence of alloy/zirconia primer and 10-methacryloyloxydecyl dihydrogen phosphate (MDP)-containing resin layer treatments on the shear bond strength (SBS) of composite resin to zirconia after aging.
Materials And Methods: Sixty zirconia (Y-TZP) blocks were air-abraded (35-µm Al O ) and divided into 6 experimental groups (n = 10) in terms of primer/resin layer as follows: (1) control, without any primer or resin; (2) AP, Alloy Primer; (3) ZPP, Z-Prime Plus; (4) PL/ZPP, Z-Prime Plus with light polymerization; (5) AP+SEB, Alloy Primer along with light-cured bonding resin of a self-etch adhesive system (SE Bond); and (6) ZPP+SEB, Z-Prime Plus with SE Bond. After composite resin placement and light polymerization, the specimens were stored in distilled water (37°C for 4 months) and thermal-cycled for 6000 cycles.
Article Synopsis
- This report outlines a technique for repairing an implant with severely damaged internal threads.
- The damaged post from the previous restoration was successfully removed using an impression coping and an end-cutting bur.
- A new cast post and core, along with a 2-unit ceramometal prosthesis, were created based on an elastomeric impression of the implant's internal surface and the neighboring implant's position.
The post-and-core pattern duplication technique is a simple, cost-effective, and accurate method of ensuring the reproducibility of a cast post and core. An acrylic resin pattern is fabricated for an endodontically treated tooth. The post portion of the pattern is duplicated with a polyvinyl siloxane impression material in the lower compartment of a container.
View Article and Find Full Text PDFImplant alignment is an important factor in overdentures retained by solitary abutments. In this study, the effect of implant angulations in two directions, on the amount of retention of attachments was evaluated. Ninety models were divided into nine groups of two blocks each; one for two implants and one for two attachments.
View Article and Find Full Text PDFPurpose: Two commonly used attachment systems for implant-retained overdentures are bar and ball systems. The aim of this study was to compare these two types of attachments on the basis of the stresses introduced to the mandibular posterior residual ridge by an overdenture retained by two implants.
Method And Materials: A basic model was generated from the data provided by a CT scan of a patient's mandible, the diagnostic casts, and the existing overdenture.