PURPOSE This study evaluated the effect of different cements on resistance to dislodgment of crowns cemented on preparations lacking geometric resistance form. MATERIALS AND METHODS A preparation that offered no geometric resistance form, with 20 degrees total occlusal convergence (TOC), 0.9 mm wide shoulder finish line, and a 2.5 mm axial wall height was created on an ivorine tooth using a m...

objectives: this study aimed to compare the shear bond strength (sbs) of composite to stainless steel crowns (ssc) using two mechanical surface treatments (msts) and two bonding systems. materials and methods: eighty-four sscs were divided into six groups of 14; group1: no mst+scotchbond universal adhesive (n+u), group 2: surface roughening by a diamond bur+scotchbond universal adhesive (r+u), ...

When an esthetic restoration with minimal tooth reduction is desired, for example in patients with uncomplicated tooth fractures, composite partial coverage crowns may be a therapeutic option. The indirect composite restoration allows restoration of the original tooth anatomy, function, and esthetics to be reproduced while preserving tooth structure. The use of composite partial coverage crowns...

Abstract This survey paper wants to highlight the mathematical impact of celebrated by Gaschütz in which concepts prefrattini subgroups and crowns were introduced.

OBJECTIVE This study examined the fit of two types of all-ceramic single crowns and indirect composite resin full coverage crowns. MATERIAL AND METHODS Thirty intact human mandibular first premolars were selected for this study and prepared using a machine to standardize the dimensions and randomly divided into 3 groups. Slip cast (IC) (In-Ceram Zirconia, Vita Zahnfabrik), copy-milled zirconi...

The objectives of this study were to identify the effect of design parameters, namely marginal thickness, degree of convergence and the different interfacial conditions, on the initial failure load that induces cracking from the margin in glass-simulated dental crowns. Crown-like glass cylinders were prepared to simulate posterior all-ceramic crowns with two different marginal thicknesses (0.8 ...

OBJECTIVES The wear of telescopic crowns is a common problem often reducing the patient's satisfaction with the denture and resulting in a renewal of the denture. The study aims to compare the wear behavior of conical crowns using electroplated copings (group E ) with standard telescopic crowns with cast female parts (group C). MATERIAL AND METHODS 10 conical crowns were milled for each group...

STATEMENT OF THE PROBLEM One disadvantage of cement-retained crowns is the lack of predictable irretrievability. This problem can be overcome through designing a screw access hole in the metal substructure of cement-retained restoration and using porcelain stain to define this area. PURPOSE This study aimed to evaluate the influence of existence of screw access hole on porcelain fracture resi...

Aim: To compare the clinical performance of milled PEEK-based single crowns to zirconia veneered through evaluation restoration fracture, margin adaptation, and patient satisfaction. Methodology: Twenty-four full coverage were fabricated for posterior teeth. The patients divided into two groups according crowns’ material: Group 1(control group) received Zr Group2 (intervention Bio HPP crowns. p...