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1.
Heliyon ; 9(12): e23047, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-38125455

RESUMO

Purpose: Novel terms describing several designs of resin-bonded fixed partial dentures (RBFPDs) continue to appear. Indeed, a variety of terms are used in the English scientific literature The use of a standard terminology is important for a fair and efficient understanding. This study aimed to investigate if the terminology used to describe designs and retention methods for anterior RBFPDs is standard. Methods: An electronic search in the English literature was conducted in PubMed/Medline to identify all publications reporting RBFPDs in the anterior region until August 2022. This search was completed by hand searching. Terms indicating different designs of RBFPDs were listed and then classified. Percentages of their use were calculated to determine the commonly used terms. Analysis of the use of these terms was performed based on the standards determined by the latest edition of the Glossary of Prosthodontic Terms (GPT). The impacts of the MeSH Thesaurus and GPT on the nomenclature used for RBFPDs was assessed. Results: A total of 125 articles were eligible for this review. In the retained articles, 86 terms were found. Among them, thirty-nine terms were classified into three groups. Only six terms were defined in the latest edition of GPT (GPT-9). Several classified terms that are commonly used were not identified in the GPT-9. Conversely to the GPT-9 which impact was insignificant, the MeSH Thesaurus had an important impact on the nomenclature used for RBFPDs. Conclusion: The terminology used to describe designs and retention methods for anterior RBFPDs was non-standard. The GPT-9, constituting an important reference, defined a limited number of terms related to RBFPDs and had no significant impact on the standardization of the terminology used for RBFPDs. Efforts should therefore be continued to standardize the terminology. A specialized mini-glossary grouping and defining all the terms found in this study will helpful in clarifying the terminology used for the anterior RBFPDs.

2.
Urol Case Rep ; 43: 102114, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35600810

RESUMO

Upper tract urothelial carcinoma presents 5% of urothelial cancers. The most frequent revealing symptom gross haematuria. Vaginal metastasis is rare revealing condition. The combination on these two symptoms should recall the diagnosis of this neoplasm. Biopsy of the vaginal mass can make the histologic diagnosis easily.

3.
Prog Urol ; 32(6): 472-479, 2022 May.
Artigo em Francês | MEDLINE | ID: mdl-35260340

RESUMO

INTRODUCTION: Clean Intermittent Catheterization (CIC) is the method of choice for bladder emptying in patients having bladder emptying disorders, acquired or pharmacologically induced, whether it is neurologically related or not. The aim of this study is to assess the theoretical and practical knowledge of general practitioners (GP) on CIC. MATERIALS: Observational prospective study (anonymous online questionnaire) was conducted with 224 GP between March and April 2020. Each physician had to complete a questionnaire about the definition of CIC, its indications and usage, the indications of urine culture, antibiotic therapy, and the complications of this method of drainage. RESULTS: Only 18.3% of GP that took part in the study gave an exact definition of CIC. As to the importance of it, 67.9% responded that it protects the upper urinary tract and 37.1% that it prevents urinary tract infections (UTI). Fifty-two per cent of physicians were unaware of the regular frequency at which it should carry out a day. Fifty eight percent prescribed sterile gloves and 57.1% an antiseptic. UTI was considered as the main complication of CIC by 87.1% of physicians and 35.7% requested a systematic urine culture for patients under CIC. For patients with an asymptomatic bacteriuria, 65.6% of GP prescribed antibiotic therapy. CONCLUSION: GP need to improve their knowledge of SIP, its framework, indications, modalities, and the way to deal with colonization or urinary tract infection. This will improve the management of impacted patients.


Assuntos
Clínicos Gerais , Cateterismo Uretral Intermitente , Doenças da Bexiga Urinária , Bexiga Urinaria Neurogênica , Infecções Urinárias , Antibacterianos/uso terapêutico , Pesquisas sobre Atenção à Saúde , Humanos , Cateterismo Uretral Intermitente/efeitos adversos , Cateterismo Uretral Intermitente/métodos , Internet , Estudos Prospectivos , Doenças da Bexiga Urinária/terapia , Bexiga Urinaria Neurogênica/complicações , Bexiga Urinaria Neurogênica/terapia , Cateterismo Urinário/efeitos adversos , Cateterismo Urinário/métodos , Infecções Urinárias/etiologia , Infecções Urinárias/prevenção & controle
4.
Prog Urol ; 31(17): 1175-1181, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34656449

RESUMO

INTRODUCTION: Vesico-vaginal fistula (VVF) is a global healthcare problem that has a high prevalence in developing countries. The aim of this work is to study the epidemiological, clinical and therapeutic characteristics of VVF post-obstetric and gynecologic procedures in order to identify the predictive factors of surgical treatment failure. METHODS: Data were collected from 132 VVF patients in our institution between 1985 and 2017. VVF was classified according to Zmerli's classification. Patients underwent surgical treatment and were evaluated after a follow-up period of 6 months. Successful treatment was defined as the absence of urine leakage whereas recurrence was defined as the presence of urine leakage immediately after the surgery or after a period of dryness with a confirmed VVF. Risk factors of surgical treatment failure were identified. RESULTS: The average age of patients was 44 years. The patients were multiparous in 62% of cases. VVF was consecutive to hysterectomy in 62.1% of cases, and after childbirth in 34%. VVF was retro-trigonal in 99 cases (75%) and trigonal in 33 cases (25%). The average size of the fistula was 1cm (0.3-2cm). VVF repair was performed by vaginal approach in 68% of cases and abdominal approach in 32% of cases. Treatment failure was noted in 36 patients (27%). Predictive factors of treatment failure were: vaginal fibrosis (P<0.001); trigonal location of the fistula (P<0.001); large diameter of the VVF>1cm (P<0.001); and complex and complicated fistulas (P=0.02). CONCLUSION: Although Tunisia is a developing country, the main cause of VVF was not obstetrical. Treatment failure, noted in almost one third of cases, was, in our series, correlated with the quality of the vaginal tissue, the size and the location of the fistula, and its complexity. LEVEL OF PROOF: 4.


Assuntos
Fístula Vesicovaginal , Adulto , Feminino , Humanos , Histerectomia , Gravidez , Fatores de Risco , Falha de Tratamento , Tunísia/epidemiologia , Fístula Vesicovaginal/epidemiologia , Fístula Vesicovaginal/etiologia , Fístula Vesicovaginal/cirurgia
5.
Morphologie ; 105(350): 210-216, 2021 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-33071051

RESUMO

AIM OF THE STUDY: The main difficulties during retroperitoneal laparoscopic adrenalectomies are due to its location. Our objective was to define the relationship of the adrenals with the diaphragm and the psoas muscle. METHODS: Our work is an anatomical dissection of 80 fresh cadavers' adrenals. To study the right adrenal, we performed a right nephrectomy and adrenal remained attached to the Inferior vena cava by its main vein. On the left, the edges of the adrenal have been identified by needles and the adrenal was reclined to study its projection on the posterior muscular wall. RESULTS: The right adrenal is located higher, 13mm [4-20mm] above the medial arcuate ligament (MAL) in 16 cases (40%). Its lower border was at the same level as the MAL in 18 cases (45%) and 11mm [10-17mm] below the MAL in 6 cases (15%). The posterior support of the right adrenal was the right crus of the diaphragm (Right-CD) in 34 cases (85%) and straddling the Right-CD and the psoas in 6 cases (15%). The study of the relationships of the left adrenal with the MAL showed that the lower edge of the gland was at its same level in 16 cases (40%) and below in 24 cases (60%) by 14mm [8-24mm]. The posterior support of the left adrenal was the left crus of the diaphragm (Left-CD) in 16 cases (40%) and straddling the Left-CD and the psoas in 24 cases (60%). CONCLUSIONS: Our results showed that the right adrenal is higher. The MAL is an important posterior element to the adrenal gland that could serve as an anatomical landmark to identify the adrenal during laparoscopic adrenalectomy.


Assuntos
Parede Abdominal , Laparoscopia , Glândulas Suprarrenais , Cadáver , Humanos , Músculos
6.
Prog Urol ; 30(17): 1126-1133, 2020 Dec.
Artigo em Francês | MEDLINE | ID: mdl-32682849

RESUMO

BACKGROUND: The treatment of overactive bladder syndrome (OABS) by percutaneous pelvic nerve stimulation (PTNS) is usually recommended as a third line treatment. The purpose of this work was to compare PTNS alone on idiopathic OABS in women against a treatment combining PTNS and pelvic floor muscle training (PFMT). METHODS: This was a retrospective comparative study of 58 patients, followed at the urodynamic unit. Thirty patients received PTNS alone and 28 PTNS+pelvic floor rehabilitation. The main instrument used to measure the outcomes was the voiding diary. RESULTS: The average age of our patients was 55.2 years. In the PTNS group, there was a significant improvement in daily micturitions (6 after PTNS vs. 10 before, P<0.001), nocturia (1.08 after PTNS vs. 1.75 before, P=0.003), urgency (7 daily before PTNS vs. 11 before (P<0.001) and maximum voided volume (378mL after PTNS vs. 306mL before, P=0.004). The Ditrovie score and USP scores showed a significant decrease. In the PTNS+PFMT group, a significant improvement was noted for the criteria: daily frequency episodes (5.7 after PTNS+PFMT vs. 7.56 before, P<0.001), nocturia (1.4 after PTNS+PFMT vs. 2.3 before, P=0.001), and daily urgency episodes (7 after PTNS+PFMT vs. 9 before, P<0.01). The OAB and SUI USP scores and the Ditrovie score decreased significantly (USP SUI score: 1.2 after PTNS+PFMT vs. 3.4 before (P<0.001) ; USP OAB score: 5.2 after PTNS+PFMT vs. 10.4 before, P<0.001). The comparison of the two groups (PTNS vs. PTNS+PFMT) did not show any significant difference in the voiding dairy outcomes and in the subjective scores outcomes (USP and Ditrovie). CONCLUSION: No significant difference was observed concerning outcomes following PTNS alone and combined PTNS and PFMT in women presenting OABS. LEVEL OF EVIDENCE: 3.


Assuntos
Terapia por Exercício , Estimulação Elétrica Nervosa Transcutânea , Bexiga Urinária Hiperativa/terapia , Adulto , Idoso , Terapia Combinada , Feminino , Humanos , Pessoa de Meia-Idade , Diafragma da Pelve , Estudos Retrospectivos , Nervo Tibial , Adulto Jovem
7.
Prog Urol ; 29(16): 962-973, 2019 Dec.
Artigo em Francês | MEDLINE | ID: mdl-31537493

RESUMO

INTRODUCTION: Genetic factors must be considered in etiological diagnosis of urinary lithiasis. The aim of this study was to determine clinical, metabolic characteristics and the progression of hereditary urinary lithiasis in our patients. METHODS: A retrospective study was conducted between 2008 and 2018 and 60 patients were included. Patients were referred to our department from pediatrics departments to be followed-up in adulthood in 9 cases, for etiological investigation in 42 cases and for chronic renal failure in 9 cases. RESULTS: Thirty-five men and twenty-five women were enrolled in this study with a M/F sex ratio equal to 1.4. The mean age at the time of diagnosis of the hereditary character of the urinary lithiasis was 28.6years (3months-63years). The average delay between the onset of the lithiasis disease and the etiological diagnosis was 8years (0-42years). We noted 31 cases of cystinuria, 18 cases of primary hyperoxaluria type 1 with two mutations (I244T in 14 cases, 33-34 Insc in 23 cases) and 11 cases of renal tubulopathy. Fourteen patients were affected with chronic renal failure, of which five were in the end-stage renal disease. Crystalluria was positive in 62% of cases. The morpho-constitutional analysis of stones was performed in 37 cases and it contributed to the diagnosis in 29 cases. After an average follow-up of 16years, we noted normal renal function in 42 cases, chronic renal failure in 7 cases, hemodialysis in 10 cases all with primary hyperoxaluria and transplantation in 1 case. CONCLUSION: The etiological diagnosis of hereditary urinary lithiasis in our study was made with considerable delay. Cystinuria was the most frequent etiology and primary hyperoxaluria was the most serious affection. LEVEL OF EVIDENCE: 4.


Assuntos
Cálculos Renais/genética , Adolescente , Adulto , Criança , Pré-Escolar , Progressão da Doença , Feminino , Hospitais Especializados , Humanos , Lactente , Cálculos Renais/complicações , Cálculos Renais/diagnóstico , Cálculos Renais/metabolismo , Masculino , Pessoa de Meia-Idade , Nefrologia , Estudos Retrospectivos , Adulto Jovem
8.
Tunis Med ; 96(2): 97-100, 2018 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30324973

RESUMO

BACKGROUND: Living kidney donation for transplantation has become common practice. The decisions to accept a donor with nephrolithiasis are becoming frequent. AIM: The aim of our study was to report our experience in the living donor kidney with asymptomatic lithiasis. METHODS: Over a period of 4 years from 2009 to 2013 we collected 18 cases. From the clinical, metabolic and radiological data, we have determined the etiology of urolithiasis in our patients and established, after a literature review, a decision tree of kidney donation. RESULTS: Our study included 10 women and 8 men with a mean age of 43 years. The nephrolithiasis was discovered incidentally during radiological assessment through the urinary tract without preparation in 1 case, the abdominal ultrasound in 6 cases and the abdominal CT scan in 11 cases. The donation of kidney in our study was performed in 1 case and disqualified in the others cases especially for metabolic abnormalities. In the single couple donor-recipient, after a follow up of 5 years; we have not identified adverse side effects either in the donor or in the recipient patient. CONCLUSION: In living donors with nephrolithiasis the final decision of renal transplantation must be based on the confrontation between the clinical, biological and radiological data. Metabolic disorders constituted the mainly contraindication of kidney donation in our patients.


Assuntos
Cálculos Renais/epidemiologia , Transplante de Rim/estatística & dados numéricos , Doadores Vivos/estatística & dados numéricos , Urolitíase/epidemiologia , Adulto , Feminino , Humanos , Incidência , Achados Incidentais , Rim/patologia , Rim/fisiopatologia , Falência Renal Crônica/epidemiologia , Falência Renal Crônica/terapia , Testes de Função Renal , Masculino , Pessoa de Meia-Idade , Nefrectomia/estatística & dados numéricos , Nefrologistas/estatística & dados numéricos , Adulto Jovem
9.
Prog Urol ; 28(10): 488-494, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29983333

RESUMO

INTRODUCTION: Paragangliomas, defined as extra-adrenal chromaffin-cells tumors, are rarely located in the retro-peritoneum. Clinical presentation is similar to pheochromocytoma, and mainly depends on the producing character of the tumor. Positive diagnosis requires plasmatic and urinary hormonal assays. Radiological and isotopic explorations are essential before surgery. The only curative therapeutic strategy is surgical, associated to peri-operative prevention and monitoring of the frequently reported hemodynamic and cardiovascular disorders. Outcome depends of the metastatic character of the tumor, the presence of tumor remnant after surgical resection. Genetic study is recommended; the risk of recurrence and association to other neoplasm is more described in genetic forms. MATERIAL AND METHODS: Authors report 5cases of retro-peritoneal paraganglioma, operated in the department of urology of Hospital, between 2013 and 2017. Observations are about 2men and 3women. Clinical presentation is not always specific and paraganglioma may be discovered fortuitously. Two patients have been operated by coelioscopic approach, midline incision was performed in two other cases, and dorsal lumbotomy associated to a Rutherford-Morrison incision in a patient. RESULTS: Two patients presented resistant hypertension and palpitation associated to suspect retro-peritoneal masses in imagery and elevated urinary methoxylated derivates before surgery. One patient was asymptomatic and the tumor was discovered in imagery. Per-operative hypertensive crisis and sinus tachycardia occurred in a case. The average follow-up period is 22.8months. Hypertension and palpitation disappeared after surgery. There was no recurrence for all the operated patients. CONCLUSION: Retro-peritoneal paraganglioma is a rare condition. Symptoms are not specific and clinical presentation may be similar to pheochromocytoma. Abdominal CT-scan and MRI, in association with MIBG scintigraphy are strongly evocative. Histological examination ensures diagnosis. Per-operative cardio-vascular disorders are to consider and must prevented and managed by anesthesiologists. Complete surgical resection is the only curative treatment and avoids recurrences.


Assuntos
Paraganglioma/diagnóstico , Feocromocitoma/diagnóstico , Neoplasias Retroperitoneais/diagnóstico , Adulto , Feminino , Seguimentos , Humanos , Imageamento por Ressonância Magnética/métodos , Masculino , Pessoa de Meia-Idade , Recidiva Local de Neoplasia , Paraganglioma/patologia , Paraganglioma/cirurgia , Feocromocitoma/patologia , Neoplasias Retroperitoneais/patologia , Neoplasias Retroperitoneais/cirurgia , Tomografia Computadorizada por Raios X/métodos
10.
Soft Matter ; 14(30): 6256-6263, 2018 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-29989127

RESUMO

In capillary-driven fluid dynamics, simple departures from equilibrium offer the chance to quantitatively model the resulting relaxations. These dynamics in turn provide insight on both practical and fundamental aspects of thin-film hydrodynamics. In this work, we describe a model trilayer dewetting experiment elucidating the effect of solid, no-slip confining boundaries on the bursting of a liquid film in a viscous environment. This experiment was inspired by an industrial polymer processing technique, multilayer coextrusion, in which thousands of alternating layers are stacked atop one another. When pushed to the nanoscale limit, the individual layers are found to break up on time scales shorter than the processing time. To gain insight on this dynamic problem, we here directly observe the growth rate of holes in the middle layer of the trilayer films described above, wherein the distance between the inner film and solid boundary can be orders of magnitude larger than its thickness. Under otherwise identical experimental conditions, thinner films break up faster than thicker ones. This observation is found to agree with a scaling model that balances capillary driving power and viscous dissipation with a no-slip boundary condition at the solid substrate/viscous environment boundary. In particular, even for the thinnest middle-layers, no finite-size effect related to the middle film is needed to explain the data. The dynamics of hole growth is captured by a single master curve over four orders of magnitude in the dimensionless hole radius and time, and is found to agree well with predictions including analytical expressions for the dissipation.

11.
J Med Case Rep ; 12(1): 172, 2018 Jun 20.
Artigo em Inglês | MEDLINE | ID: mdl-29921313

RESUMO

BACKGROUND: Splenogonadal fusion is a rare and benign condition. Diagnosis is challenging for clinicians. Despite its indolence, diagnosis is often confirmed after orchidectomy. Surgery is mandatory, particularly to rule out the extremely rare association with malignancy. CASE PRESENTATION: We report a case of splenogonadal fusion in a 38-year-old North African man presenting a palpable scrotal mass. We describe clinical aspects, pathogenic hypothesis, radiological features, as well as surgical management principles. CONCLUSIONS: Splenogonadal fusion is rarely suspected and diagnosed preoperatively. A diagnosis is made once an ectopic testicular mass is associated with cryptorchidism and suggestive radiological signs. A better knowledge of the clinical and radiological features of splenogonadal fusion provides an opportunity for conservative surgery.


Assuntos
Coristoma/diagnóstico , Baço , Doenças Testiculares/diagnóstico , Testículo/cirurgia , Adulto , Coristoma/congênito , Coristoma/cirurgia , Edema/etiologia , Humanos , Masculino , Orquiectomia , Escroto , Doenças Testiculares/congênito , Doenças Testiculares/cirurgia
12.
Urol Case Rep ; 11: 17-18, 2017 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-28083478

RESUMO

Cutaneous metastases from bladder malignancies are rare. We report the case of a 74 year old man who underwent cysto-prostatectomy and adjuvant chemotherapy for a pT3b N+ bladder transitional cell carcinoma. Four months later, he presented with skin disseminated pigmented lesions. Skin biopsy confirmed cutaneous metastasis from urothelial carcinoma.

14.
Prog Urol ; 26(8): 450-6, 2016 Jun.
Artigo em Francês | MEDLINE | ID: mdl-27430498

RESUMO

INTRODUCTION: Calcium oxalate stones are the most common urolithiasis. Changes in dietary habits, socio-economic and health status of populations explain its progression. The aim of our study was to determine metabolic factors leading to lithiasis and clarify its causes. PATIENTS AND METHODS: This is a retrospective study of 100 patients with calcium oxalate stones identified by morpho-constitutional study, collected in our department over a period of 5 years (2008-2013). We analyzed clinical, radiological and metabolic data. RESULTS: They were 73 men and 27 women (gender ratio: 2.7), aged meanly of 44.8 years. Dietary survey revealed inadequate calcium intake in 87% of cases. Urinary abnormalities were hypocitraturia (34%), hypomagnesuria (32%) and outflow hypercalciuria (21%). Crystalluria was positive in 44% of cases. Whewellite was the most common crystalline form. Calculi were bilateral (53%), renal (85%) and mainly collected after urological procedures (74%). Infrared analysis showed that 81% of stones have a heterogeneous composition. Pure Whewellite or combined with other compounds was the most frequent (31%). Idiopathic calcium oxalate lithiasis was the most common etiology (69%). Among secondary etiologies, diabetes was most frequently found (10%). CONCLUSION: Our epidemiological study of calcium oxalate stones has allowed us to identify the high frequency of food hyperoxaluria partly explained by a low calcium intake and a diet rich in oxalate phytotherapy. LEVEL OF EVIDENCE: 4.


Assuntos
Oxalato de Cálcio , Urolitíase/epidemiologia , Adolescente , Adulto , Idoso , Oxalato de Cálcio/análise , Estudos Epidemiológicos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Fatores de Risco , Adulto Jovem
15.
J Immunoassay Immunochem ; 37(4): 359-67, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26919632

RESUMO

We studied epidermal growth factor receptor (EGFR) expression profile in urothelial bladder carcinoma (UBC) which is a complex and heterogeneous disease with a large spectrum of histological aspects and deadly potential. Using immunohistochemistry (IHC), all GI tumors and pTa cases showed a low expression profile of EGFR. However, we note that when the stage of disease is advanced, tumors over-express EGFR. Indeed, 5% and 25% of GII and GIII tumors over-expressed EGFR, respectively. Further, 0% of pTa, 9,5% of pT1, 15% of pT2, 50% of pT3, and 90% of pT4 tumors were shown to be high EGFR expression (HEE). Moreover, we found a statistically significant correlation between the EGFR over-expression and grade and stage (P < 0.05). Thus, EGFR over-expression could be a potential prognostic marker to predict poor outcome in Tunisian patients with UBC.


Assuntos
Biomarcadores Tumorais/análise , Receptores ErbB/análise , Neoplasias da Bexiga Urinária/diagnóstico , Neoplasias da Bexiga Urinária/metabolismo , Idoso , Biomarcadores Tumorais/biossíntese , Biomarcadores Tumorais/imunologia , Receptores ErbB/biossíntese , Receptores ErbB/imunologia , Humanos , Imuno-Histoquímica , Prognóstico , Neoplasias da Bexiga Urinária/imunologia
20.
Langmuir ; 30(39): 11599-608, 2014 Oct 07.
Artigo em Inglês | MEDLINE | ID: mdl-25209183

RESUMO

Ellipsometry and X-ray reflectivity were used to characterize the mass density and the glass transition temperature of supported polystyrene (PS) thin films as a function of their thickness. By measuring the critical wave vector (qc) on the plateau of total external reflection, we evidence that PS films get denser in a confined state when the film thickness is below 50 nm. Refractive indices (n) and electron density profiles measurements confirm this statement. The density of a 6 nm (0.4 gyration radius, Rg) thick film is 30% greater than that of a 150 nm (10Rg) film. A depression of 25 °C in glass transition temperature (Tg) was revealed as the film thickness is reduced. In the context of the free volume theory, this result seems to be in apparent contradiction with the fact that thinner films are denser. However, as the thermal expansion of thinner films is found to be greater than the one of thicker films, the increase in free volume is larger for thin films when temperature is raised. Therefore, the free volume reaches a critical value at a lower Tg for thinner films. This critical value corresponds to the onset of large cooperative movements of polymer chains. The link between the densification of ultrathin films and the drop in their Tg is thus reconciled. We finally show that at their respective Tg(h) all films exhibit a critical mass density of about 1.05 g/cm(3) whatever their thickness. The thickness dependent thermal expansion related to the free volume is consequently a key factor to understand the drop in the Tg of ultrathin films.

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