169,747 research outputs found
Severe side effects on all the anterior lower teeth of a bonded retainer: a clinical case : Gravi effetti collaterali sui denti anteriori inferiori di un retainer fisso: un caso clinico
No full textOBJECTIVES
This case report presents the possible and unexpected clinical severe complications of a bonded
mandibular lingual retainer and an
achievable therapeutic solution.
MATERIALS AND METHODS
18-year-old boy comes to our observation; he reports a previous
orthodontic treatment and not to
carry out regular check-ups. Intraoral examination shows: class I
malocclusion, flexible and intact
spiral wire retainer bonded on the
lingual surface of the lower front
teeth, inferior midline deviated to
the left side, lower incisors proclined and inclined to the left side,
both mandibular canines and incisors wrongly torqued. Orthopantomography (OPT) shows a
moderate root resorption of the
lower front teeth with a very important divergence of the roots of
left canine and lower incisors.
Cone beam computed tomography shows the root of the right
canine almost completely out of
the bone on its lingual side and
the root of the left canine out of
the bone on its buccal side.
We start a new orthodontic treatment to realign the teeth and to
correct the transverse malocclusion. At the end of treatment, the
smile of the patient was normalized with a good balance of the
occlusal plane.
RESULTS AND CONCLUSIONS
At the end of treatment, the smile
of the patient was normalized with
a good balance of the occlusal
plane. A good and stable molar
and canine class I occlusion was
achieved with correct overjet,
overbite and transversal relationships. Orthopantomography
showed the correction of the inclination of the lower front teeth
with a moderate apical root resorption of the four lower incisors
that was present also in the initial
OPT. CBCT showed the correction
of the axial inclination of the right
canine with a good lingual bone
thickness. On the left canine the
good axial inclination achieved
was evident; lingual bone thickness was ideal but on the buccal
side there was no adequate
amount of cortical bone.
Although fixed retainers are generally adequate in preventing relapse,
sometimes their inadvertent activity causes distortion of the dental
arch. If not periodically checked by
clinicians, such reported in this
case report, fixed retainers may
cause devastating complications
and orthodontic retreatment could
be the solution in restoring the
physiological arch shape.
CLINICAL SIGNIFICANCE
Fixed retainers can cause major
complications for the dental elements affected by the retainer in
terms of unwanted inclinations and
movements with consequent damage to the periodontal structures.
Regular monitoring by clinicians is
therefore highly recommended.
Orthodontic retreatment may
prove to be the ideal solution to restore the physiological shape of
the arch and the correct inclination
of the roots of the affected teeth.
OBJECTIVES This case report presents the pos sible and unexpected clinical se vere complications of a bonded mandibular lingual retainer and an achievable therapeutic solution. MATERIALS AND METHODS 18-year-old boy comes to our ob servation; he reports a previous orthodontic treatment and not to carry out regular check-ups. In traoral examination shows: class I malocclusion, flexible and intact spiral wire retainer bonded on the lingual surface of the lower front teeth, inferior midline deviated to the left side, lower incisors pro clined and inclined to the left side, both mandibular canines and in cisors wrongly torqued. Orthop antomography (OPT) shows a moderate root resorption of the lower front teeth with a very important divergence of the roots of left canine and lower incisorsCone beam computed tomogra phy shows the root of the right canine almost completely out of the bone on its lingual side and the root of the left canine out of the bone on its buccal side. We start a new orthodontic treat ment to realign the teeth and to correct the transverse malocclu sion. At the end of treatment, the smile of the patient was normal ized with a good balance of the occlusal plane. RESULTS AND CONCLUSIONS At the end of treatment, the smile of the patient was normal ized with a good balance of the occlusal plane. A good and sta ble molar and canine class I oc clusion was achieved with cor rect overjet, overbite and transversal relationships. Orthopan tomography showed the correc tion of the inclination of the lower front teeth with a moderate apical root resorption of the four lower incisors that was present also in the initial OPT. CBCT showed the correction of the axial inclination of the right canine with a good lin gual bone thickness. On the left canine the good axial inclination achieved was evident; lingual bone thickness was ideal but on the buccal side there was no ade quate amount of cortical bone. Although fixed retainers are gener ally adequate in preventing relapse, sometimes their inadvertent activi ty causes distortion of the dental arch. If not periodically checked by clinicians, such reported in this case report, fixed retainers may cause devastating complications and orthodontic retreatment could be the solution in restoring the physiological arch shape. CLINICAL SIGNIFICANCE Fixed retainers can cause major complications for the dental ele ments affected by the retainer in terms of unwanted inclinations and movements with consequent dam age to the periodontal structures. Regular monitoring by clinicians is therefore highly recommended. Orthodontic retreatment may prove to be the ideal solution to restore the physiological shape of the arch and the correct inclination of the roots of the affected teeth
traumatologia oculare da scoppio di bottiglia di vetro
No full textlesioni oculari da scoppio del tappo da champagn
Problemi di chirurgia oculare nella sindrome di Lowe.
No full textSi descrive un caso di Sindrome di Lowe con presenza di cataratta e dermoide corneale associato. Si mettono in evidenza le problematiche di chirurgia oculare
Author Correction: Periodontal evaluation of palatally impacted maxillary canines treated by closed approach with ultrasonic surgery and orthodontic treatment: a retrospective pilot study (Scientific Reports, (2021), 11, 1, (2843), 10.1038/s41598-021-82510-y)
No full text
Hess area ratio and diplopia: evaluation of 30 patients undergoing surgical repair for orbital blow-out fracture.
No full textEffect of basic fibroblast growth factor and cytochrome c peroxidase combination in transgenic mice corneal epithelial healing process after excimer laser photoablation
No full textPurpose: To evaluate the role of prepared basic fibroblast growth factor (bFGF) and cytochrome c peroxidase (CCP) combination eyedrops in corneal epithelial healing of transgenic mice (B6(A)-Rperd12/J ) after excimer laser photoablation.
Materials and methods: In this prospective study, 216 eyes of 108 mice underwent bilateral photorefractive keratectomy. We considered 4 groups: A, B, C, and D. Group A received standard topical postoperative therapy with tobramycin, diclofenac, and dexamethasone eyedrops plus CCP at 3 drops per day for a week or until corneal re-epithelialization was achieved. Group B received standard topical postoperative therapy plus bFGF eyedrops and phosphate-buffered saline (PBS) 3 drops per day for a week or until corneal re-epithelialization was complete. In group C, 1 eye received standard topical postoperative therapy plus CCP eyedrops, bFGF eyedrops, and PBS 3 drops per day for a week or until corneal re-epithelialization was complete. Control eyes (group D) received a standard topical postoperative therapy plus placebo eyedrops. Mice were followed-up for a week from the day after the surgery to evaluate the rate of corneal re-epithelialization.
Results: Data were analyzed by ANOVA using the XLSTAT 2010 software. Eyes in group A, B, and C healed completely before the fifth postoperative day, achieving, respectively, a re-epithelialization time of 92 hours ± 10 SD, 90 hours ± 12 SD, and 86 hours ± 12 SD. Group D had a re-epithelialization time of 121 hours ± 8 SD (P < 0.05). No side effects or toxic effects were documented
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Tabulation-based sample-partitioning adaptive reduced chemistry and cell agglomeration
No full textIn this study, we combine the SPARC (Sample-Partitioning Adaptive Reduced Chemistry) and the Cell Agglomeration (CA) techniques, to accelerate the simulation of laminar and turbulent reactive flows with detailed kinetics. The reduced mechanisms adopted by SPARC are generated on the basis of representative thermo-chemical states corresponding to laminar, steady-state flamelets parameterized by the mixture fraction and a progress variable, in line with the TRAC (Tabulated Reactions for Adaptive Chemistry) method, recently proposed by Surapaneni and Mira (Comb and Flame, 2023). To further speed-up the calculation, CA (consisting in grouping the cells having similar thermo-chemical states) is carried out before identifying the local reduced mechanism by means of SPARC. To demonstrate the effectiveness of the approach, we considered two benchmark cases: (i) a laminar, pulsating laminar coflow diffusion flame fueled by a mixture of C
2H
4 and N
2 burning in air; (ii) a 2D, turbulent, non-premixed flame burning n-C
7H
16 in air subject to decaying isotropic turbulence. In both cases, a detailed kinetic mechanism accounting for the formation of PAHs and soot particles and aggregates was considered. The results are promising, showing both accuracy and computational efficiency. While this study uses non-premixed flamelets with mixture fraction and progress variable as an illustrative example, the proposed methodology has the potential to be applied to various combustion modes, including premixed and partially premixed scenarios.</p
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
- …
