Daniel Givan

• University of Alabama at Birmingham

Purpose To compare mechanical, optical, and physical properties of denture base materials fabricated with various 3D printing systems to reference milled and conventionally heat‐processed denture base materials. Materials and Methods Specimens of denture base materials were either 3D‐printed (DLP in‐office printer, CLIP laboratory printer, or mate...

Background: To determine what thickness of 5 mol% yttria zirconia (5Y-Z) translucent crowns cemented with different cements and surface treatments would have equivalent fracture resistance as 3 mol% yttria (3Y-Z) crowns. Methods: The study included 0.8 mm, 1.0 mm, and 1.2 mm thickness 5Y-Z (Katana UTML) crowns and 0.5 and 1.0 mm thickness 3Y-Z (Kat...

Purpose: Screw-retained zirconia implant crowns with an internal titanium base have favorable mechanical properties compared with single-piece zirconia implant crowns; however, the screw-retained implant crowns require adequate bonding between the zirconia crown and the titanium base. This study measured the retention between a titanium base and a...

Statement of problem The clinical challenge of adhering cement to intracanal dentin is transmitting light to the most apical parts of root canals to allow more efficient polymerization of the cement. Purpose The purpose of this in vitro study was to compare the cement-polymerizing ability, microstructure, and radiopacity of a new fiber optic post...

Statement of problem: The etiology (chemical, friction, abfraction) of noncarious cervical lesion (NCCL) progression is poorly understood. Purpose: The purpose of this 5-year prospective clinical trial was to measure the relationship between NCCLs and various etiologic factors. Material and methods: After review board approval, 29 participants...

This study evaluated the two-year clinical performance and volumetric wear of a flowable resin composite compared to a conventional highly filled composite resin in Class I restorations. In this single-center, single-blinded, comparator-controlled clinical study (Institutional Review Board approved), 120 carious teeth distributed in 60 patients wer...

PurposeTo investigate the effects of abutment design to correct for implant angulation and aging on the fracture resistance of zirconia abutments. Greater understanding of the fracture strength of the zirconia abutments under various clinical conditions may lead to improvement of clinical protocols and possibly limit potential failures of implant p...

Precious metals have a long history of use for dental applications because of their ease of manipulation and excellent biocompatibility. Presently, most precious alloys are used for restoration of teeth as crowns or bridges by casting and lost-wax investment methods. This chapter reviews common characteristics of dental precious alloys, and common...

Objective: To compare the clinical performance of a Universal adhesive in a self and total etch mode to a two bottle total-etch dental adhesive in the restoration of non-carious cervical lesions (NCCLs). Method: 43 adult subjects, 19 years or older, were recruited after obtaining informed consent. To be included each subject had at least 3 1.5mm...

Information about the influence of zirconia crown surface treatment and cement type on the retention of zirconia crowns is limited. It is unclear whether zirconia crowns require surface treatment to enhance their retention. The purpose of this in vitro study was to evaluate the effect of surface treatment on the retention of zirconia crowns cemente...

Objective: Prior research reports successful bone integration along implant regions initially implanted with Hydroxyapatite (HA) coatings and particulates. This study focused on analyzing structural and elemental properties of bone-implant interfaces from 3 post-mortem samples that included HA-coated mandibular custom osseous implants composed of c...

Objective: This study focuses on analyzing the microscopic structure and chemical properties of bone-implant interfaces of samples obtained from hydroxyapatite coated mandibular cobalt alloy custom implants after roughly eleven years in function. The hypothesis was that the plasma sprayed coating, which was present at implant delivery, would be mos...

Objectives: To compare the clinical performance of two self-etching dental adhesives to a one bottle total-etch dental adhesive by restoring non-carious cervical lesions (NCCLs). Methods: 50 adult subjects 19 years or older were recruited after obtaining informed consent. Each subject at least 3 NCCLs with minimum depth of 1.5mm. The teeth were res...

The purpose of this investigation is to evaluate marginal discrepancy and fracture resistance of two veneering materials using two preparation designs. Two veneer preparation designs (full and traditional) were restored with leucite-reinforced ceramic (ProCAD, Ivoclar Vivadent, Amherst, NY) milled by CAD/CAM (Cerec 3D milling system, Serona Dental...

Digital impressions may provide new paradigms for fixed prosthodontics, but the clinical efficacy is not well established. Objective: The purpose of this randomized, prospective double-blind clinical study was to evaluate the impression time, adjustment time, and marginal fit of all-ceramic crowns made by digital and conventional impression techn...

In vivo composite wear is a significant problem in large posterior restorations. To develop more wear resistant composite resin materials, wear machines that accurately predict in vivo wear are necessary. OBJECTIVE: To measure and compare the volumetric wear loss of in vitro specimens and in vivo restorations of a highly filled BisGMA nano-hybrid...

Objectives: The objective of this research was to test the microtensile strength of the bone-implant interface of a subperiosteal implant after approximately eleven years of function. The hypothesis was that the microtensile strength of those interfaces coated with calcium phosphate would be greater than that of uncoated regions. Methods: The man...

A patient presenting with severe microstomia (PDI Class IV) was unable to insert a maxillary complete denture. Sectional final impressions were made using two impression materials and an interlocking custom tray. A folding record base was used for maxillomandibular relationship records. A novel folding maxillary denture with a custom hinge and plun...

Resin-based composites (RBC) are used by 80% of the dentists practicing in the United States. New products are introduced often to circumvent problems associated with material performance. Variables based on ADA specifications for ADA approval include assessment of color match, marginal adaptation, marginal discoloration, proximal contact, caries a...

The purpose of this study was to investigate the fit of cast alloy overdenture and laser-welded titanium-alloy bars by measuring induced strain upon tightening of the bars on a master cast as well as a function of screw tightening sequence. Four implant analogs were secured into Type IV dental stone to simulate a mandibular edentulous patient cast,...

Placing successful posterior esthetic restorations are clinically challenging. Flow and adaptation of the composite-resin to the preparation may influence clinical success. We compared two composites having different viscosities, a highly filled and a flowable resin. Objective: This in vivo study evaluated VOCO Grandio and Grandio Flow using Scotch...

Purpose: To determine if etching technique influences the bond strength of resin cement to root canal dentin. Materials and Methods: Fifty-five extracted teeth were endodontically treated, dowel space prepared, and divided into five groups. Each group was treated with different etchant consistencies: acid gel, semi-gel, low-viscosity gel, liquid, a...

Precious alloys are an important material group in dentistry because of their ease of use, excellent compatibility, favorable mechanical and physical properties, and application in ceramometal bonding. Although new precious alloys have been introduced in the past decades, frequently because of economic pressure, gold-based alloys remain a popular c...

The material, mechanical, and clinical aspects of surface degradation of resin composite dental restorative materials by in vitro wear simulation continues to be an area of active research. To investigate wear mechanisms, a series of experimental resin composites with variable and controlled filler particle shape and loading were studied by in vitr...

To establish an in vitro analysis system to evaluate the effect of cyclic loading on the bond strengths and durability of luting materials bonded to titanium. Machine-milled titanium disks were finished with 600 grit silicon-carbide paper and pairs of disks were bonded together using the five different luting materials. A stainless steel stylus was...

The tensile median fatigue limits and fracture mode of 4-META cement were evaluated after bonding Ni-Cr, Ni-Cr-Be, and Co-Cr alloys to enamel. Alloy surfaces, 6 mm in diameter, were grit blasted with 50 microns Al2O3 and cemented to etched bovine enamel under a 2 kg load. Samples were cycled in tension to failure or 10(6) cycles at 5 Hz in Ringer's...

This study determined the shear bond strength (SBS) of composite bonded to chlorhexidine-treated enamel and untreated enamel. Fifty human molars were mounted in cold- cure acrylic and the superficial enamel of the buccal or lingual surface was exposed using 600-grit silicon carbide paper. During the experimental protocol, the control group (n = 25)...

Tensile fatigue endurance limits were determined for three base metals (Ni-Cr, Ni-Cr-Be, and Co-Cr) bonded to bovine enamel using two composite cements: a Bis-GMA/phosphate ester composite cement which relies on a sand-blasted metal surface, and a Bis-GMA composite luting cement which relies on electrolytically etched metal surfaces. Samples were t...

The purpose of this research was to evaluate the torsional strength and ductility of CP titanium in the as received condition, heat treated below the alpha----beta transition temperature, and glass bead blasted. Results were compared to as-received samples of implant quality 316L stainless steel. Little or no effect of any of the treatments was not...