Implantes dentales en pacientes con liquen plano oral. Revisión sistemática / Dental implants in patients with lichen planus. Systematic review

Introducción: El liquen plano se considera una enfermedad muco-cutánea crónica, en la que la etiopatogenia se considera una alteración autoinmune mediada por células, con una prevalencia entre 0.5 y 2%. La colocación de implantes dentales en pacientes con dicha enfermedad puede hacer cambiar el éxito del tratamiento. Material y Método: se realizó una búsqueda en la base de datos Pub Med y Med line, utilizándose como palabras clave: “lichen planus” y "dental implant". El criterio de inclusión fue de estudios en humanos con liquen plano oral a los que se les había tratado con implantes dentales osteointegrados publicados en lengua inglesa que sean observacionales, experimentales y series de casos publicados entre 1990 y 2020. Resultados: Se selecciona un total de 13 artículos, la N total de implantes fue de 362 implantes colocados en 148 pacientes. El seguimiento de los implantes es de 2 a 10 años. Hay un fracaso de 45 (12,43%) implantes, de los cuales 42 sucede en pacientes con liquen plano activo y 3 en cuadros de liquen erosivo sin especificar si está en fase activa o no. La tasa de fracaso fue mayor en las mujeres (61%) en comparación con los hombres (44%). En uno de los casos, se diagnostica carcinoma oral de células escamosas [COCE] 3 años después de la colocación del implante, lo que corresponde al 0,2% de los casos. Conclusión: el liquen plano oral es una enfermedad autoinmune que debemos tener en cuenta cuando colocamos implantes y controlar periódicamente. (AU)

Introduction: Lichenplanus is considered a chronic mucocutaneous disease, in which etiopathogenesisis considered a autoimmune disorder, with a prevalence between 0.5 and 2%. Placing dental implants in patients with this disease can change the success of the treatment. Material and Method: A search was made in the Pub Med and Med line database, using as keywords: "lichen planus" and "dental implant". The inclusion criteria was studies in humans with oral lichen planus who had been treated with osseo integrated dental implants published in English, which are observational, experimental or clinical cases published between 1990 and 2020. Results: A total of 13 articles are selected, the N of implants was 362 implants placed in 148 patients. The follow-up of the implants is from 2 to 10 years. There is a failure of 45 (12,43%) implants, of which 42 occurs in patients with active lichen planus and 3 in a erosive lichen without specifying if they are in the active phase or not. The failure rate was higher in women (61%) compared to men (44%). In one case, oral squamous cell carcinoma [OSCC] is diagnosed 3 years after implant placement, which corresponds to 0.2% of cases. Conclusion: oral lichen planus is an auto immune disease that we must take into account when we place implants and control periodically. (AU)

Methodology for the Evaluation of Double-Layered Microcapsule Formability Zone in Compound Nozzle Jetting Based on Growth Rate Ratio.

Double-layered microcapsules, which usually consist of a core (polymeric) matrix surrounded by a (polymeric) shell, have been used in many industrial and scientific applications, such as microencapsulation of drugs and living cells. Concentric compound nozzle-based jetting has been favored due to its efficiency and precise control of the core-shell compound structure. Thus far, little is known about the underlying formation mechanism of double-layered microcapsules in compound nozzle jetting. This study aims to understand the formability of double-layered microcapsules in compound nozzle jetting by combining a theoretical analysis and numerical simulations. A linear temporal instability analysis is used to define the perturbation growth rates of stretching and squeezing modes and a growth ratio as a function of the wave number, and a computational fluid dynamics (CFD) method is implemented to model the microcapsule formation process in order to determine the good microcapsule forming range based on the growth ratio curve. Using a pseudobisection method, the lower and upper bounds of the good formability range have been determined for a given materials-nozzle system. The proposed formability prediction methodology has been implemented to model a water-poly (lactide-co-glycolide) (PLGA)-air compound jetting system.

Alginate Microsphere Fabrication Using Bipolar Wave-Based Drop-on-Demand Jetting.

Scale-up microsphere fabrication with controllable microsphere size has always been an exciting manufacturing challenge. The objective of this study is to experimentally study the effects of material properties and operating conditions on the formability of alginate microspheres and the microsphere size during drop-on-demand (DOD)-based single nozzle jetting. Alginate microspheres have been fabricated using bipolar wave-based drop-on-demand jetting, and its formability and size have been studied especially as a function of sodium alginate and calcium chloride concentrations, voltage rise/fall times, dwell and echo times, excitation voltage amplitudes, and frequency. It is found that 1) the formability is sensitive to the sodium alginate and calcium chloride concentrations, dwell and echo voltages, and voltage dwell time; and the formability decreases with the sodium alginate concentration but increases with the calcium chloride concentration, dwell and echo voltages, and voltage dwell time; 2) the size is not sensitive to the sodium alginate and calcium chloride concentrations but increases first with the dwell time and then decreases; and 3) the size increases with the dwell and absolute echo voltage amplitudes.

Case report. Unusual presentation of a pancreatic mass in an infant: pancreatic haemangioendotheliomatosis.

Primary pancreatic tumours are extremely rare in children. We report a case of a 5-month-old male with a diffuse invasive tumour of the head of the pancreas. The tumour demonstrated peripancreatic extension into the porta hepatis, which occluded the portal vein and invaded the superior mesenteric artery. It was found to be haemangioendotheliomatosis of the pancreas. Imaging, pathological findings and a brief relevant classification of haemangioma are discussed.

[Retroperitoneal paraganglioma. Infrequent pathology]. / Paraganglioma retroperitoneal. Patología poco frecuente.

Presentation of 3 cases of retroperitoneal paraganglioma non pre-operatively diagnosed: one dependent of the Zuckerkandl's organ with ultrasound examination showing a panelled cystic mass, and two located in the renal parahilar area, all accidental findings during renal surgery. Lack of appropriate pre-operative background and diagnosis produced a hypertensive crisis in one patient during removal manoeuvres which was entirely controlled. After a 4-, 2- and 1-year follow-up, respectively, patients remain asymptomatic and disease-free. An analysis of the most relevant features in these retroperitoneal tumorations was carried out from a clinical, diagnostic, therapeutic and prognostic point of view.

Early conception in patients with untreated mild endometriosis.

The purpose of this paper is to report the reproductive experience in 31 infertile patients with mild endometriosis who were not treated by surgery or medication. A series of 31 cases of laparoscopically diagnosed mild endometriosis were followed up without therapy for a period of 36 months. Ten patients received artificial insemination by donor (AID) because of male-related infertility; 21 patients had well-timed postcoital tests and monitored ovulation cycles. Life-table analysis of conceptions was used for presentation of the pregnancy rate. The group of patients whose husbands were azoospermic had a 90% pregnancy rate within 18 months, with a mean of 3.5 treatment cycles for pregnancy. The nonazoospermic couples had a 47.6% pregnancy rate within 18 months, with a mean of 7.2 monitored cycles for pregnancy. The calculated median delays for the series of patients who conceived were 1.9 cycles. The whole series (n = 31) of patients with mild endometriosis had an 8.3% monthly pregnancy rate within 18 months and a 61.2% cumulative pregnancy rate within 18 months. We have come to the conclusion that mild endometriosis does not interfere with female fertility, and patients with this extent of disease should not be treated for a trial period of at least 18 months as an alternative to more aggressive therapy.

Peritoneal flushing and biopsy in laparoscopically diagnosed endometriosis.

A series of 74 patients with endoscopically proven endometriosis were selected for evaluation of usefulness of peritoneal flushing and aspiration in the early diagnosis of pelvic endometriosis. Forty-three patients had either an ovarian or a peritoneal biopsy performed after peritoneal lavage. The results indicate that 25% of the washings performed were successful in demonstrating endometrial glands or stroma. On the other hand, 72% of the patients on whom biopsies were performed showed endometrial tissue, and biopsy failures were mainly related to the technical difficulties of the ovarian biopsy. In 46% of the histologically proven cases of endometriosis, peritoneal lavage failed to demonstrate endometrial tissue. Conversely, in 4.6% of the negative biopsy cases, peritoneal lavage showed endometrial glands. We conclude that exfoliative cytology is not a useful tool in the diagnosis of endometriosis. On the other hand, we were able to make the diagnosis by biopsy in more than 70% of the patients on whom biopsies were performed.

Prognostic value of postcoital test in unexplained infertility.

A series of 70 couples with suspected unexplained infertility and who became pregnant after 262 monitored cycles, were reviewed. In each cycle, the postcoital test was scheduled near ovulation time as judged by prior basal body temperature shifts and by cycle length. Postcoital test was graded as excellent, good, fair, bad, and negative. A mean of 26.7% of pregnancy rate per cycle resulted and a mean of 3.74 cycles were needed to obtain a pregnancy. Pregnancy rate was higher (P less than 0.01) for cycles with excellent postcoital test and lower for cycles with bad test. There were no statistically significant differences (P greater than 0.05) in percentage of pregnancies between cycles with either excellent, good, or fair postcoital test. On the other hand, there was statistically significant decrease (P less than 0.05) in the percentage of pregnancies when cycles had bad postcoital test.

The corpus luteum in infertile patients found during laparoscopy.

A series of 407 infertile patients underwent luteal phase laparoscopy and endometrial biopsy as a part of their infertility workup. In 91% of the patients, a good correlation between the results of endometrial biopsy and those of laparoscopy was found. In 8% of the patients a secretory endometrium was found, but the laparoscopy did not show any luteal structures on the ovaries. Seventy-one percent of the patients had corpora lutea, but the stigma was only present in 17.5% of the series with secretory endometrium. Because of the stigma findings, only 326 patients with secretory endometrium were evaluated. The stigma was more frequently seen when laparoscopy was performed between day 17 and day 19 of the cycle. On the other hand, the stigma was also more frequently seen when laparoscopy was performed between 10 and 12 days before the actual onset of the next period. We conclude that the frequency of stigmata at the corpus luteum is a matter of the time in the cycle when laparoscopy is performed, and the particular cycle length of the patient should be considered.