PURPOSE To assess whether the amount of residual coronal dentin and the placement of a prefabricated (DT Light Post) (LP) or a customized fiber post (Ever Stick Post) (ES) have a significant influence on the 3-year survival of endodontically treated premolars. METHODS A sample of 345 patients provided six groups of 60 premolars in need of endodontic treatment. Groups were defined based on the...

Optogenetic channels have greatly expanded neuroscience's experimental capabilities, enabling precise genetic targeting and manipulation of neuron subpopulations in awake and behaving animals. However, many barriers to entry remain for this technology - including low-cost and effective hardware for combined optical stimulation and electrophysiologic recording. To address this, we adapted the op...

We demonstrated a miniature and in situ ~13-layer graphene nanomechanical resonator by utilizing a simple optical fiber Fabry-Perot (F-P) interferometric excitation and detection scheme. The graphene film was transferred onto the endface of a ferrule with a 125-μm inner diameter. In contrast to the pre-tension induced in membrane that increased quality (Q) factor to ~18.5 from ~3.23 at room tem...

Background: The glass fiber post system with a similar elastic modulus to dentin is widely indicated reinforce teeth after the endodontic treatment. Many studies emphasized importance of ferrule effect and length in strengthening endodontically treated teeth. However, simultaneous influence 2 factors on increasing fracture resistance still controversial. Objectives: To evaluate depth insertion ...

The conventional wisdom is that optical fiber is dielectric, and thus does not radiate RF emissions. In practice, optical fiber cable connectors have non-negligible amounts of conductive material, for example a ferrule, spring, and crimp ring. As data rates have increased beyond 1 gigabit/second (Gbps), equipment with supposedly “RF tight” enclosures exhibited high levels of RF emissions, faili...

A self-compensating fiber optic flow sensor system based on the principle of broadband white-light interferometers and cantilever beam bending is described. The fiber optic sensor system uses two fiber ferrule sensors that are bonded on either side of a cantilever beam to measure the flow rate by monitoring the air-gap changes caused by the bending of the cantilever beam. Cross sensitivity of t...

Background: Biological width is a natural defensive space for periodontal tissue which important maintaining healthy so that it can support the success of dental restoration treatment. The localized alveolar bone loss, gingival recession, hyperplasia or combination all three be caused by poor biological restoration. obtained through crown lengthening when teeth have caries subgingival fractures...

introduction: prefabricated metal and ceramic posts can be used with different kinds of core materials as an alternative to the conventional casting post and cores. it is unclear how these post and core systems can withstand different kind of forces in the mouth. the purpose of this study was to compare the fracture strength of endodontically treated, crowned maxillary incisors restored with ca...