Publications by authors named "F Rueggeberg"
Objectives: The depth of cure using blue-light photocuring units (BL) is limited by tooth structure and qualities of the restorative material through which the activating wavelength must pass. Recent developments incorporate an infrared (IR) activated upconversion (UC) fluorescence of a lining agent filled with nanocrystals of NaYF4 and doped with YB+3 and Tm+3 that emit both blue and violet light locally at the interface of the liner and restorative resin. The purpose of this study was to evaluate the BL and 975 nm infrared (IR) light power transmission through dental tissues and restorative materials.
View Article and Find Full Text PDFPurpose: To evaluate the effect of toothbrushing on the surface roughness (Sa), roughness profile (Rv), gloss units (GU), and surface morphology of three glazed ceramics.
Materials And Methods: Specimens (n = 7) were made from the following different CAD/CAM materials and evaluated: lithium disilicate-based glass ceramic (EM); zirconia-reinforced lithium silicate glass ceramic (CE); and 6 mol% yttria partially-stabilized zirconia (IN). IPS e.
Article Synopsis
- - This study measured the temperature changes in the pulp chamber of extracted human molars during different photoactivation techniques for curing resin-based composites in cavities, using a T-type thermocouple to monitor real-time temperatures.
- - Two types of bulk-fill composites were tested with various curing durations and methods, all delivering the same energy exposure, while their hardness was assessed after sectioning the cured materials.
- - Results showed that while one composite had higher temperature increases than the other during some methods, all techniques kept temperature rises below 5.5 °C, indicating they are safe for dental use due to acceptable hardness ratios.
Background: The open sandwich technique is a reliable alternative to amalgam placement in deep proximal box preparations, where proper isolation and enamel bonding may not be possible. It is often difficult to prepare the box for composite placement without affecting the resin-modified glass ionomer (RMGI) that has been placed in the gingival portion. We hypothesized that RMGI surfaces that are roughened or those that use all steps in the manufacturing bonding protocol, including the priming solution, applied before placing a bonded composite increment, would have greater composite/RMGI shear bond strength.
View Article and Find Full Text PDFArticle Synopsis
- The study aimed to assess how the orientation of 3D-printed provisional resins affects factors like gloss, surface roughness, and color difference.
- Various 3D printers and resin types were used to create samples in different orientations, which were subjected to cleaning and testing after simulating wear from toothbrushing.
- The results indicated that the orientation of the 3D-printed resins did not have a significant impact on gloss, surface roughness, maximum profile valley depth, or color difference.