Camphorquinone (CQ) is by far the most widely used visible-light photoinitiator in biomedical applications. Despite fact that CQ well established and has a good clinical acceptance, photoinitiating systems based on have some drawbacks particular poor water solubility low photoreactivity. Here synthesis testing of new camphorquinone derivative are described. Carboxylated-camphorquinone (CQCOOH) was synthesized using ketopinic acid as starting material. The chemical structure CQCOOH verified...

The aim of this in vitro study was to determine the influence remineralisation time on rehardening surface–softened enamel after citric acid erosion. Seven groups 13 samples human were eroded 0.3% at pH 3.2 for 2 h followed by profilometric measurements. Individual specimens placed artificial saliva 1, 2, 4, 6, 9 or 24 h. A control group isotonic saline After new measurements ultrasonicated stepwise up 480 s with performed 5, 30, 120, 240 and measure depth surface softening. had a softened...

Abstract Background: Cervical dentine wear is commonly observed and may be associated with hypersensitivity. Erosion thought to play a part in both conditions but compared enamel has been little studied dentine. Aim: The aims of these studies vitro were to: (i) determine the effects citric acid on at different pH values over time; (ii) measure depth demineralisation or softening using ultrasonication; (iii) whether softened can remineralised rehardened artificial saliva. Methods: Groups flat...

Two types of interaction erosive and abrasive forces with human enamel were analysed in an vitro study. To simulate toothbrushing or chewing after acidic challenge, specimens eroded 0.3% citric acid (pH 3.2), then brushed without silica abrasive. simultaneous erosion abrasion, as would occur during food, abraded a machine, abrasive, while immersed acid. Enamel wear was measured by profilometry. In both experiments the combination abrasion resulted significantly greater than alone, but no...

The aim of this study was to use ultrasonication as a method measure subsurface demineralisation enamel. Polished human enamel samples with surface profiles within +/-0.3 microm were divided into 6 groups 10 specimens. specimens exposed 0. 3% citric acid (pH 3.2) for 30 min, 1, 2, 3 or 4 h. depths the resulting lesions measured using profilometer. A control group stored in water Ultrasonication performed on specimen 5, 30, 120, 240 and 480 s profilometric measurements at each time point....

Enamel erosion and softening are based on chemical processes which could be influenced by many factors including temperature acid flow rate. Knowledge of the influence these variables have relevance to research experiments clinical outcomes. Both parameters were investigated using an ultrasonication profilometry method assess depth surface enamel. The was studied eroding polished human enamel samples at 4, 20, 35 or 50 degrees C for 2 h. Secondly, different liquid conditions established...

The association of severe erosion with certain habits consuming soft drinks prompted a study in relation to fluid flow. In the main experiments, citric acid solution (pH 3.2) was directed at polished enamel surfaces flow rates 26, 67 or 126 ml min −1 through outlets diameters 1.0, 2.6 5.0 mm for up 20 min. Erosion depth increased time exposure and total volume solution, increasing rate decreasing outlet diameter. Scanning electron microscopy acid‐treated subsurface indicated that clearance...

Abstract Objectives This single‐blinded randomized clinical trial evaluated the effect of adjuvant oral irrigation in addition to self‐administered care on prevalence and severity peri‐implant mucositis. Material & Methods After randomization, patients suffering from mucositis were assigned following: Group 1 (control) received hygiene instruction following a standardized protocol, including sub‐ supramucosal mechanical debridement. 2 3 additionally instructed use an irrigator with...

Abstract A defined surface roughness is important for the adhesive bonding of veneering ceramic to zirconia frameworks. Thus, we investigated effects that sandblasting has upon and residual stress zirconia. So as achieve well-defined blasting parameters also generate highly reproducible results; a custom-made, automated machine was constructed (based on 3D-printer construction kit). Thirty-two samples (measuring 30 mm × 35 0.2 mm) were cut from densely sintered 3Y-TZP blanks then ground with...

Soft drinks have been successfully modified to reduce enamel erosion. The aim of this study was further modify an original low erosive blackcurrant drink product by the addition a gum, manipulate more favourably other parameters. single–blind, randomised four treatment crossover design involving 12 healthy volunteers. During 10 working–day periods, subjects wore samples in mid palatal region removable appliance. Specimens were taped expose 2–mm window. under test were: (1) Orange juice, (2)...

After exposing enamel specimens to 0.3% citric acid at pH 3.2 for various times, the was titrated 7 before rinsing in water. freeze-drying were examined by scanning electron microscopy. This procedure eliminates artefacts due drying and mineral precipitation. The results showed that outer region of softened is much more delicate than previously thought, even after short (5- 20-min) etching times. Mineral lost from both prism boundaries bodies, resulting a surface presenting thin, separate...

Eisenburger M, Mache T, Borchers L, Stiesch M. Fracture stability of anterior zirconia crowns with different core designs and veneered using the layering or press-over technique. Eur J Oral Sci 2011; 119: 253–257. © 2011 In current in vitro study, fracture cores was investigated after applying veneering techniques. Four groups (n = 10 each group) were produced a computer-aided design/computer-aided manufacturing (CAD/CAM) process. Cores standard cervical design technique (CCL) (CCP). Further...

This study analyzed the fracture load before and after a chewing simulation of zirconia crowns that were trepanned repaired using composite resin. Overall, 3 groups with 15 5Y-PSZ in each group tested. For A, unmodified was evaluated. B, resin, also followed by test. C, prepared like B but received thermomechanical cycling final tests. Furthermore, scanning electron microscopy (SEM) X-ray (XRM) analysis performed for C. The mean loads standard deviation 2260 N ± 410 (group A), 1720 380 B),...

The aim of this study was to use ultrasonication and profilometry as methods de– remineralisation citric acid–eroded enamel at different pH values. Seventy–eight polished human samples were divided into three test control groups 13 specimens each. Three each group chosen for SEM examination. exposed 0.3% acid 2.54, 3.2 or 4.5 2 h. depths the resulting lesions measured by profilometry. placed in artificial saliva stored saline (0.9% NaCl) 24 h new profiles recorded. Finally all ultrasonicated...

Peri-implant infections from bacterial biofilms on artificial surfaces are a common threat to all medical implants. They handicap for the patient and can lead implant failure or even life-threatening complications. New have be developed reduce biofilm formation improve long-term prognosis of The aim this study was (1) develop new method test antibacterial efficacy by direct surface contact (2) elucidate whether an innovative antimicrobial copolymer coating 4-vinyl-N-hexylpyridinium bromide...

In almost all finite element (FE) studies in dentistry, virtual forces are applied directly to dentures. The purpose of this study was develop a FE model with non-linear contact simulation using an antagonist as force transmitter and compare similar that uses direct transmission. Furthermore, five situations were created order examine their influence on the peri-implant bone stresses, which relevant survival rate implants. It found stresses strongly influenced by kind transmission number.

The aim of the current study was to access prevalence depression among patients with Temporomandibular Joint Disorder (TMD) compared no TMD.Patients (92) and controls (90) answered questionnaires on subjective pain, severity chronic jaw disability, emotional well-being depression, a clinical examination performed.Temporomandibular reported higher disability function, (p<0.001). myoarthopathy subgroup (67.4%) had slightly more than myopathy (p>0.05). While 51% TMD poor well-being, only 7.8%...