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D McGloin
It is perhaps surprising that something as fragile as a microscopic droplet could possibly form a laser. In this article we will review some of the underpinning physics as to how this might be possible, and then examine the state of the art in the field. The technology to create and manipulate droplets will be examined, as will the different classes of droplet lasers. We discuss the rapidly developing fields of droplet biolasers, liquid crystal laser droplets and explore how droplet lasers could give rise to new bio and chemical sensing and analysis...
May 2017: Reports on Progress in Physics
Yu-Cheng Chen, Qiushu Chen, Tingting Zhang, Wenjie Wang, Xudong Fan
Biolasers are an emerging technology for next generation biochemical detection and clinical applications. Progress has recently been made to achieve lasing from biomolecules and single living cells. Tissues, which consist of cells embedded in an extracellular matrix, mimic more closely the actual complex biological environment in a living body and therefore are of more practical significance. Here, we developed a highly versatile tissue laser platform, in which tissues stained with fluorophores are sandwiched in a high-Q Fabry-Pérot microcavity...
January 31, 2017: Lab on a Chip
Yanhui Wei, Xianqing Lin, Cong Wei, Wei Zhang, Yongli Yan, Yong Sheng Zhao
Microlasers with good biocompatibility are of great significance to the detection of tiny changes in biological systems. Most current biolasers were realized through the introduction of biomaterials into various external resonators, resulting in an increase of difficulties in application. Here, we used starch as the host to build dye@starch microlasers by encapsulating guest organic laser dye into the interhelical structure of starch granules. The as-prepared dye@starch system with high transparency and ultrasmooth spherical surface functions as an efficient whispering gallery mode resonator for low threshold lasing...
December 19, 2016: ACS Nano
Ferah Rehman, Gyanendra Kumar, Mridula Goswami, Jatinder Kaur Dhillon
Aim: The aim of this invitro study is to evaluate the shear bond strength of reattached fractured incisor fragments using Er,Cr:YSGG laser and conventional acid etching without additional tooth preparation. Materials and methods: Forty extracted human teeth were divided in two groups of 20 each (Groups A and B). In Group A, fractured surface was treated by an Er, Cr: YSGG laser system (Waterlase MD, Biolase Technology Inc., San Clemente, CA, USA) operating at a wavelength of 2,780 nm and frequency of 20 Hz...
June 29, 2016: Laser Therapy
Sistla Venkata Jyotsna, Raja Vatsavai Chakradhar Raju, Jaya Prakash Patil, Thakur Veerandar Singh, Neha Bhutani, Shekar Kamishetty, Kiran Ghatole
INTRODUCTION: Microorganisms causing periapical infection are usually difficult to eradicate after conventional endodontic treatment or even in retreatment resulting in poor outcomes. So the purpose of the study was to assess whether disinfection of root canal with laser had any effect on bacteria in the periapex region. AIM: The aim of the present study was to evaluate the effects of a diode laser when activated in root canals with varying apical diameters, on the bacteria present beyond the apex of the teeth...
May 2016: Journal of Clinical and Diagnostic Research: JCDR
(no author information available yet)
No abstract text is available yet for this article.
May 2016: Dentistry Today
Vishal Vijayan, K Rajasigamani, K Karthik, Sasidharan Maroli, Jitesh Chakkarayan, Mohamed Haris
OBJECTIVE: This study was performed to assess the resin tag length penetration in enamel surface after bonding of brackets to identify which system was most efficient. METHODOLOGY: Our study was based on a more robust confocal microscopy for visualizing the resin tags in enamel. Totally, 100 extracted human first and second premolars have been selected for this study and were randomly divided into ten groups of 10 teeth each. In Group 1, the buccal enamel surface was etched with 37% phosphoric acid (3M ESPE), Group 2 with 37% phosphoric (Ultradent)...
August 2015: Journal of Pharmacy & Bioallied Sciences
D Strakas, K Tolidis, E Koliniotou-Koumpia, L Vanweersch, R Franzen, N Gutknecht
The purpose of this pilot in vitro study was to evaluate the temperature increase in the pulp chamber of the teeth, during Er,Cr:YSGG bleaching, as well as to show which teeth are the most susceptible in terms of pulp temperature increase during laser-activated bleaching treatment. Although Er:YAG studies have been published on this subject, it is the first time Er,Cr:YSGG wavelength is tested. Fifteen teeth were tested--3 each of the following--(maxillary central incisors, lateral incisors, canines, premolars and mandibular incisors)...
January 2016: Lasers in Medical Science
Mükerrem Hatipoğlu, Çağatay Barutcigil, Osman Tolga Harorlı, Bülent Ulug
The present study aimed to reveal potential damage of the lasers, which are used as an alternative to manual instruments in periodontal therapy, might cause to the surface of restorative materials. Four different restorative materials were used: a glass-ionomer cement (GIC), a flowable composite (FC), a universal composite (UC) and an amalgam. Ten cylindrical samples (8 mm × 2 mm) were prepared for each restorative material. Two laser systems were used in subgingival curettage mode; an 940 nm diode laser (Epic Biolase, Irvine, CA) and an Er,Cr:YSGG laser (Waterlase iPlus, Biolase, Irvine, CA)...
May 2016: Scanning
Yun-Lu Sun, Zhi-Shan Hou, Si-Ming Sun, Bo-Yuan Zheng, Jin-Feng Ku, Wen-Fei Dong, Qi-Dai Chen, Hong-Bo Sun
For the first time, proteins, a promising biocompatible and functionality-designable biomacromolecule material, acted as the host material to construct three-dimensional (3D) whispering-gallery-mode (WGM) microlasers by multiphoton femtosecond laser direct writing (FsLDW). Protein/Rhodamine B (RhB) composite biopolymer was used as optical gain medium innovatively. By adopting high-viscosity aqueous protein ink and optimized scanning mode, protein-based WGM microlasers were customized with exquisite true 3D geometry and smooth morphology...
2015: Scientific Reports
(no author information available yet)
No abstract text is available yet for this article.
January 2015: Compendium of Continuing Education in Dentistry
N Gutknecht, C Van Betteray, S Ozturan, L Vanweersch, R Franzen
OBJECTIVE: The aim of this study was to evaluate the effectiveness of a radial firing tip of an Er,Cr:YSGG laser as an adjunct to a nonsurgical periodontal treatment. METHODS: Twelve patients with chronic or aggressive periodontitis were treated by conventional periodontal treatment using ultrasonic devices and hand instruments and, additionally, in two quadrants with an Er,Cr:YSGG laser. A new radial firing tip (RFPT 14-5, Biolase) was used with 1.5 W, 30 Hz, 11% air, 20% water, and pulse duration 140 μs...
2015: TheScientificWorldJournal
Saili M Chandavarkar, Sabita M Ram
CONTEXT: Desensitizers are used to reduce dentin hypersensitivity. They affect the surface texture of prepared dentin and may alter the retention of fixed restorations. AIMS: The aim was to evaluate the effect of dentin desensitizers on the retention of complete cast metal crowns luted with glass ionomer cement. SUBJECTS AND METHODS: Fifty freshly extracted human premolars were subjected to standardized tooth preparation (20° total convergence, 4 mm axial height) with a computer numerically controlled machine...
March 2015: Contemporary Clinical Dentistry
E Haznedaroglu, S Sozkes, A R Mentes
AIM: This in vitro study was carried out to evaluate the microhardness of enamel adjacent to a glass ionomer cement (GIC) with high fluoride content used as a sealant (Fuji Triage, GC Corp., Japan) after laser, bur or air abrasion treatment procedures. MATERIALS AND METHODS: HASH(0x3df6d40) STUDY DESIGN: 200 freshly extracted non-carious human molars were divided into 10 experimental groups according to the enamel pre-treatment method: A air abrasion (Mach 4...
December 2014: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
Upendra A Hoshing, Suvarna Patil, Ashish Medha, Siddhesh Dattatray Bandekar
INTRODUCTION: The aim of the study is in vitro evaluation of the shear bond strength of composite resin bonded to enamel which is pretreated using acid etchant and Er,Cr:Ysgg. MATERIALS AND METHODS: 40 extracted human teeth were divided in two groups of 20 each (Groups A and B). In Group A, prepared surface of enamel was etched using 37% phosphoric acid (Scotchbond, 3M). In Group B, enamel was surface treated by a an Er, Cr: YSGG laser system (Waterlase MD, Biolase Technology Inc...
July 2014: Journal of Conservative Dentistry: JCD
Alexandr Jonáš, Mehdi Aas, Yasin Karadag, Selen Manioğlu, Suman Anand, David McGloin, Halil Bayraktar, Alper Kiraz
Fluorescent proteins are indispensable for selective, quantitative visualization of localization, dynamics, and interactions of key molecular constituents of live cells. Incorporation of fluorescent proteins into an optical cavity can lead to a significant increase in fluorescence signal levels due to stimulated emission and light amplification in the cavity, forming a laser with biological gain medium. Utilization of lasing emission from fluorescent biological molecules can then greatly enhance the performance of fluorescence-based biosensors benefiting from the high sensitivity of non-linear lasing processes to small perturbations in the cavity and the gain medium...
August 21, 2014: Lab on a Chip
Xudong Fan, Seok-Hyun Yun
Optofluidic biolasers are emerging as a highly sensitive way to measure changes in biological molecules. Biolasers, which incorporate biological material into the gain medium and contain an optical cavity in a fluidic environment, can use the amplification that occurs during laser generation to quantify tiny changes in biological processes in the gain medium. We describe the principle of the optofluidic biolaser, review recent progress and provide our outlooks on potential applications and directions for developing this technology...
February 2014: Nature Methods
Fatih Mehmet Korkmaz, Bora Bagis, Mutlu Ozcan, Rukiye Durkan, Sedanur Turgut, Sabit Melih Ates
PURPOSE: This study investigated the effect of laser parameters and air-abrasion on the peel strength of silicon-based soft denture liner to different denture resins. MATERIALS AND METHODS: Specimens (N=180) were prepared out of three different denture base resins (Rodex, cross-linked denture base acrylic resin; Paladent, heat-cured acrylic resin; Deflex, Polyamide resin) (75 mm × 25 mm × 3 mm). A silicon-based soft denture liner (Molloplast B) was applied to the denture resins after the following conditioning methods: a) Air-abrasion (50 µm), b) Er,Cr:YSGG laser (Waterlase MD Turbo, Biolase Technology) at 2 W-20 Hz, c) Er,Cr:YSGG laser at 2 W-30 Hz, d) Er,Cr:YSGG laser at 3 W-20 Hz, e) Er,Cr:YSGG laser at 3 W-30 Hz...
August 2013: Journal of Advanced Prosthodontics
(no author information available yet)
No abstract text is available yet for this article.
May 2012: Compendium of Continuing Education in Dentistry
Bret Dyer, Eric C Sung
MINIMALLY INVASIVE SURGERY (MIS) USING THE ERBIUM, CHROMIUM: yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser (Waterlase MD, Biolase, Irvine, CA) to treat moderate to advanced periodontal disease is presented as an alternative to conventional therapies. To date, there are few short- or long-term studies to demonstrate the effects of this laser in treating and maintaining periodontal health. Electronic clinical records from 16 patients - total of 126 teeth, with pocket depths ranging from 4 mm to 9 mm - were treated with the same protocol using the Er,Cr:YSGG laser...
2012: Open Dentistry Journal
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