OBJECTIVES The purpose of this study was to investigate the effect of different air-polishing powders on the color stability of different types of composite resin restorative materials. MATERIAL AND METHODS Thirty cylindrical specimens (15×2 mm) were prepared for each of 7 composite resin restorative materials. All specimens were polished with a series of aluminum oxide polishing discs (Sof-L...

For decades Electrochemical Polishing (ECP) has been used for surface polishing of bulk metal materials such as copper and stainless steel. However, it was found very challenging to planarize patterned copper films electrodeposited on silicon wafers. This work studied the mechanisms of ECP, the surface profiles and ECP effects of copper bulk and films in various electrolyte solutions. Satisfied...

The Steward Observatory Mirror Lab is in the process of fabricating the 6.5 m mirror for the conversion of the Multiple Mirror Telescope (MMT) to a single primary mirror. For this purpose the Lab has developed a versatile polishing system built around the stressed lap polishing tool. The system must produce an f/1.25 parabolic surface with an accuracy corresponding to 0.09 arcsecond FWHM seeing...

This paper investigates the material removal mechanisms of PCD using the dynamic friction polishing technique. Scanning electron microscopy, energy dispersive X-ray, X-ray diffraction and Raman spectroscopy were used to identify the mechanisms by analyzing the specimen surfaces and debris produced by polishing. It was found that the material removal occurred in a rather complex way, which can b...

The chief goal of full coronal restoration using preformed stainless steel crowns (SSC) is replication of normal crown form and function. Marginal adaptation of SSCs involves appropriate crown size selection, trimming the crown form to achieve proper length, crimping crown edges to proximate the prepared tooth, and finishing and polishing the crown form. This report about SSC restoration focuse...

AIM To evaluate the clinical treatment effects of a glycine powder air-polishing or ultrasonic device on peri-implant mucositis. MATERIALS AND METHODS Thirty-seven patients with one implant diagnosed with peri-implant mucositis (probing depth ≥4 mm (0.2N) and bleeding on probing (BOP) (primary outcome)) were randomly assigned to treatment with either glycine powder air-polishing (GPAP) or ult...

Demands are increasing for micro axis-symmetric aspherical lenses to be installed in various optical devices. The micro glass lenses are generally molded by glass press process with micro aspheric ceramic molding dies or molds made of tungsten carbide or silicon carbide. These dies and molds are mostly ground with micro diamond wheels, but require additional finishing process as the size of the...

Background and Aim: This study aimed to assess the effect of finishing and polishing time, technique and surface coating on microleakage of encapsulated restorative resin modified glass ionomer (RMGI). Materials and Methods: In this in vitro study, 40 freshly extracted human premolars were selected. Two standard class V cavities were prepared on the buccal and lingual surfaces of each tooth. T...