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Orthodontics is a branch of dentistry which related in correction of maloccculsions Bracket are small attachments and the part of the braces that attach to each tooth, After treatment they usually debond by conventional methods but this can cause mechanical damage on the enamel. Using lasers in debonding is a new kind of research area in debonding of ceramic brackets. Using lasers while debonding...
Mid-infrared (MIR) laser with a specific wavelength can excite the corresponding biomolecular site to regulate chemical, thermal and mechanical interactions to biological molecules and tissues. In laser surgery and medicine, tunable MIR laser irradiation can realize the selective and less-invasive treatments and the special diagnosis by vibrational spectroscopic information. This paper showed a novel...
Controlled modification of implant surfaces using femtosecond, picosecond and nanosecond pulses from home-built all-fiber-integrated lasers is demonstrated. Picosecond and femtosecond pulses offer superior control over the surface texture. Increasing cell attachment to surface is discussed.
In this study we investigated the effect of J48-1 carbon dioxide (CO2) laser on the depth penetration in different teeth, namely the incisors, canines, and molars when imaged by using IME-100L Inverter Type Mobile X-Ray Equipment. The objective of the study was to identify the parameters that influence, penetration depth in the teeth and to determine the suitable value of X-ray power in kV and current...
A new and non-invasive method adapted for optical diagnosis of early caries is proposed by researching on the interaction mechanism of laser with dental tissue and relations of remitted light with optical properties of the tissue. This method without light filter, differed from the DIAGNodentreg and PNC method in its ability for registering fluorescence spectrum. The characteristic spectrum of dental...
Knowledge of laser hard tooth tissue interactions plays an important role in laser dentistry. Pulsed Er:YAG laser was capable of ablating human dentin. The diameter and depth of ablation craters increased with radiant exposure.
A tunable IR generation was demonstrated by the quasi phase-matched optical parametric oscillation, and preliminary provided a means to develop a more thorough scientific study of dental laser applications.
The aim of this study was to assess the effect of different power irradiation conditions on human dentin by pulse Er,Cr:YSGG laser. Tissue samples were derived from freshly extracted human molars. The wavelength of pulse Er, Cr:YSGG laser was 2.78 mum, pulse repetition rate was 20 Hz and pulse duration was 140 mus. Laser power of irradiation varied from 1.5 to 4 W. Laser energy was delivered through...
Proximal surface lesions are not very often detected by X-ray examination, suggesting the predominance of a subjective diagnosis on the part of the dentist. Since the magnitude of light scattering within the tooth decreases exponentially at longer wavelengths, evaluation of transillumination by near infra red lasers is a new alternative noninvasive technique to detect and quantify demineralization...
This paper presents autofluorescence of bones and teeth for 14-day and 28-day old newborn rats. The measurements were carried out by means of the fibre optical spectrometer with laser excitation source (407 nm). Differences in emission spectra of incisor, mandible and femur of rats with age were observed. It was also found that maternal administration of antiviral drug - indinavir (500 mg/kg po.)...
Oral cancer is the sixth most common cancer in the world. It is one of the most prevalent cancers in the developing countries of South Asia accounting for one third of the world burden. Sixty percent of the cancers are advanced by the time they are detected. Two methods of optical spectroscopy for detection of oral cancer have been discussed here. These methods are simple, easy to handle and noninvasive...
Hydroxyapatite (HAp) is a biological and bioactive material, which has promise as a coating material for orthopedic and dental implants. Some HAp coating methods have been investigated and the pulsed laser deposition (PLD) method is one of the most candidate. Previous PLD researchers deposited the HAp coatings on heated Ti and Ti-alloy substrates in order to crystallize the coatings. However, the...
This paper investigates new reconstructing and measuring methods of dental cast with a special laser scanning data. It first describes a new 3D reconstruction and display method of dental model, and presents an algorithm of organizing and indexing large-scale scattered triangle faces with regular cube grids. Then, it proposes a real-time and stable intersection algorithm between a line and a dental...
It has been long recognized that high cost of denture design and manufacture are the main obstacles standing in the way of dental restoration treatment. It is expected to develop a cost-efficient method and a relatively intelligent system to satisfy the growing requirements from ordinary people who are not capable of affording high expenditures aroused by traditional approaches or even some modern...
The accurate acquisition of the patient dentition is a very important step in orthognathic surgery since it permits to determine the occlusal position in order to prepare the operation. Classical methods for dental acquisition do not give a fast, accurate and low cost solution. Moreover, orthognathic surgery requires accurate registration with CTscan images, which is difficult with state of the art...
Spectrophotometric analysis of human enamel sections shows two near-IR wavelengths that are strongly absorbed and are potentially suitable for efficient generation of surface acoustic waves for dental non-destructive testing application.
The purpose of this study is to solve the problems that lie in the current research on mandibular movement and dynamic occlusion of complete denture in the field of dental restoration. On the basis of the theory of spatial mechanisms, the displacement matrix of mandibular movement on Hanau articulator is established through the method of direction cosine matrix. By adopting techniques such as laser...
Alexandrite laser ablation of enamel enhanced by an indocyanine green dye was studied. A microjet system was employed to deliver precisely measured small amounts of absorbing dye solution to the site of irradiation. A sequence of physical phenomena involved in dye-enhanced laser ablation of dental enamel was revealed when laser pulse profiles were compared with the profiles of laser-induced pressure,...
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