CAD-CAM and heat-press: Comparison of internal and marginal fit of lithium disilicate copings.

The aim of this in vitro study is to compare the performance of digital and conventional methods in the manufacture of single copings in terms of the internal and marginal fit. Twenty-four prefabricated titanium Cone Morse Exact abutments of the lateral anatomical type were used to manufacture 24 lithium disilicate copings in the CAD-CAM Ceramill (n = 12) and heat-press (n = 12) systems. The copings were cemented using a self-adhesive resin cement (RelyX U-200; 3M ESPE) and then cut vertically. The cement line was photographed using an optical microscope at ×100 and ×200 magnification and then the internal and marginal regions were measured. The mean values of fits, for the CAD-CAM and heat-press techniques, respectively, were (µm): angular regions, 81.8 and 75.3; linear regions, 63.1 and 60.1; incisal regions, 171.1 and 114.7; marginal discrepancy, 74.1 and 75.2; and absolute marginal discrepancy, 99.5 and 96.2. MANOVA test showed that there is an effect of the techniques on the regions (p < .05). The effects of laboratories and the interaction between laboratories and techniques on the regions were not statistically significant (p > .05). The techniques evaluated presented clinically acceptable results for the marginal fit. However, the conventional method performed better for the internal fit. RESEARCH HIGHLIGHTS: Scientific evidence regarding the methods of making prosthesis can help the dental professional in decision-making. Digital and conventional methods is both good in the manufacture of single copings in terms of the internal and marginal fit.

A comparative study between replica and cementation techniques in the evaluation of internal and marginal misfits of single crowns.

STATEMENT OF PROBLEM: Systematic reviews about the internal and marginal misfits of fixed prostheses have identified a limited number of clinical studies, suggesting the need for further research on the subject. Although the replica technique has been described as suitable for this purpose, few studies have validated it. PURPOSE: The purpose of this in vitro study was to compare the ability of a nondestructive replica technique and a destructive cementation technique to assess internal and marginal misfits of zirconia copings, considering current materials and designs. MATERIAL AND METHODS: Twelve anatomic prefabricated abutments (Neodent) were used to manufacture zirconia copings following the Ceramill (Amann Girrbach AG) (n=6) and Lava (3M ESPE) (n=6) systems. Replications of the cementation line were obtained with polyvinyl siloxane for the replica technique, and the copings were then cemented and sectioned to obtain 5 surfaces (buccal, palatal, mesial, distal, and incisal) and the linear and angle regions (internal axiogingival and axioincisal angles). The thickness of the cement line and silicone film was measured at 45 reference points on each abutment. A total of 540 measurements were made with an optical microscope with a digital camera at magnifications of ×100 and ×200. Data were analyzed by repeated-measures ANOVA and the Bonferroni multiple comparison tests (α=.05). RESULTS: In the internal misfit evaluation, the mean values observed for the cementation technique and replica technique were as follows: angle regions, 70.6 µm and 72.2 µm; linear regions, 59.1 µm and 59.6 µm; incisal surface, 139.0 µm and 139.8 µm; buccal surface, 72.4 µm and 73.8 µm; palatal surface, 73.1 µm and 75.2 µm; mesial surface, 74.1 µm and 73.8 µm; distal surface, 75.0 µm and 76.3 µm; and overall mean, 73.6 µm and 74.8 µm, respectively. In the evaluation of the marginal misfit, the mean values found were: buccal surface, 36.7 µm and 37.8 µm; palatal surface, 37.5 µm and 36.8 µm; mesial surface, 44.0 µm and 43.7 µm; and distal surface, 44.6 µm and 45.2 µm, respectively. No significant differences were found between the 2 techniques for all locations and systems (P>.05). CONCLUSIONS: Within the limitations of this in vitro study, both techniques presented the same ability to assess the internal and marginal misfits when the location and overall mean averages were evaluated (P>.05).

Robotic surgery techniques to approach benign prostatic hyperplasia disease: A comprehensive literature review and the state of art.

ABSTRACT: Objective: The robotic-assisted approach to simple prostatectomy (RASP) was conceived, essentially reproducing the fundaments of open simple prostatectomy. Since the first report, RASP underwent several technical modifications. The study aims to identify and describe the current robotic surgery techniques to approach benign prostatic hyperplasia (BPH). METHODS: The paper performed a non-systematic literature review accessing PubMed and Embase databases for all full-text articles published from 2008 to May 2020, assessing robot-assisted surgical techniques for BPH treatment using the terms "robot-assisted simple prostatectomy" OR "robotic simple prostatectomy" OR "RASP" AND "surgical technique". RESULTS: After careful review of 180 studies in PubMed and 198 in Embase, 16 papers reporting different RASP techniques. After the first procedure described by Sotelo et al. [9], several authors contributed to the development of the RASP technique. John et al. [24] proposed the extraperitoneal access, and Yuh et al. [23] first reported the adenoma transcapsular dissection. Some modifications were proposed by Coelho et al. [31] on trigonization, posterior reconstruction, and urethro-vesical anastomosis. Other groups focused on urethral-preserving procedures. Moschovas et al. [28] and Clavijo et al. [32] recently described an intrafascial RASP with the removal of the entire prostatic tissue. Finally, Kaouk et al. [29] reported the feasibility and safety of the da Vinci Single Port approach. CONCLUSION: In the last eighteen years, the robotic-assisted approach to BPH disease has been evolved, and different techniques have been described. This review details all the technical developments on RASP that distinctive groups have proposed since the multiport robotic platforms until the new da Vinci Single Port.

Influence of chemical composition on biochemical methane potential of fruit and vegetable waste.

This study investigates the influence of chemical composition on the biochemical methane potential (BMP) of twelve different batches of fruit and vegetable waste (FVW) with different compositions collected over one year. BMP ranged from 288 to 516LNCH4kgVS-1, with significant statistical differences between means, which was explained by variations in the chemical composition over time. BMP was most strongly correlated to lipid content and high calorific values. Multiple linear regression was performed to develop statistical models to more rapidly predict methane potential. Models were analysed that considered chemical compounds and that considered only high calorific value as a single parameter. The best BMP prediction was obtained using the statistical model that included lipid, protein, cellulose, lignin, and high calorific value (HCV), with R2 of 92.5%; lignin was negatively correlated to methane production. Because HCV and lipids are strongly correlated, and because HCV can be determined more rapidly than overall chemical composition, HCV may be useful for predicting BMP.

Open suprapubic versus retropubic prostatectomy in the treatment of benign prostatic hyperplasia during resident's learning curve: a randomized controlled trial.

PURPOSE: This study compared the suprapubic (SP) versus retropubic (RP) prostatectomy for the treatment of large prostates and evaluated perioperative surgical morbidity and improvement of urinary symptoms. MATERIALS AND METHODS: In this single centre, prospective, randomised study, 65 consecutive patients with LUTS and surgical indication with prostate volume greater than 75g underwent open prostatectomy to compare the RP (32 patients) versus SP (33 patients) technique. RESULTS: The SP group exhibited a higher incidence of complications (p=0.002). Regarding voiding pattern analysis (IPSS and flowmetry), both were significantly effective compared to pre-treatment baseline. The RP group parameters were significantly better, with higher peak urinary flow (SP: 16.77 versus RP: 23.03mL/s, p=0.008) and a trend of lower IPSS score (SP: 6.67 versus RP 4.14, p=0.06). In a subgroup evaluation of patients with prostate volumes larger than 100g, blood loss was lower in those undergoing SP prostatectomy (p=0.003). Patients with prostates smaller than 100g in the SP group exhibited a higher incidence of low grade late complications (p=0.004). CONCLUSIONS: The SP technique was related to a higher incidence of minor complications in the late postoperative period. High volume prostates were associated with increased bleeding when the RP technique was utilized. The RP prostatectomy was associated with higher peak urinary flow and a trend of a lower IPSS Score.

Open suprapubic versus retropubic prostatectomy in the treatment of benign prostatic hyperplasia during resident's learning curve: a randomized controlled trial

ABSTRACT Purpose: This study compared the suprapubic (SP) versus retropubic (RP) prostatectomy for the treatment of large prostates and evaluated perioperative surgical morbidity and improvement of urinary symptoms. Materials and Methods: In this single centre, prospective, randomised study, 65 consecutive patients with LUTS and surgical indication with prostate volume greater than 75g underwent open prostatectomy to compare the RP (32 patients) versus SP (33 patients) technique. Results: The SP group exhibited a higher incidence of complications (p=0.002). Regarding voiding pattern analysis (IPSS and flowmetry), both were significantly effective compared to pre-treatment baseline. The RP group parameters were significantly better, with higher peak urinary flow (SP: 16.77 versus RP: 23.03mL/s, p=0.008) and a trend of lower IPSS score (SP: 6.67 versus RP 4.14, p=0.06). In a subgroup evaluation of patients with prostate volumes larger than 100g, blood loss was lower in those undergoing SP prostatectomy (p=0.003). Patients with prostates smaller than 100g in the SP group exhibited a higher incidence of low grade late complications (p=0.004). Conclusions: The SP technique was related to a higher incidence of minor complications in the late postoperative period. High volume prostates were associated with increased bleeding when the RP technique was utilized. The RP prostatectomy was associated with higher peak urinary flow and a trend of a lower IPSS Score.

In vitro evaluation of the internal and marginal misfit of CAD/CAM zirconia copings.

STATEMENT OF PROBLEM: The constant updating of computer-aided design/computer-aided manufacture (CAD/CAM) systems and the introduction of new systems confirm the need for scientific evidence on internal and marginal adaptation. PURPOSE: The purpose of this in vitro study was to measure and compare the degree of internal and marginal misfits of zirconia single-unit copings made by using 3 different CAD/CAM systems (Ceramill, Lava 3M, and Neoshape). MATERIAL AND METHODS: Twenty-four anatomic prefabricated abutments (Neodent) were used to fabricate zirconia copings in Ceramill (n=8), Lava (n=8), and Neoshape (n=8). All copings were cemented and cut with a precision cutting machine to obtain 5 surfaces (mesial, distal, buccal, palatal, and incisal) and angle regions (internal axiogingival and axioincisal angles). Measurements were obtained from images at a magnification of ×100 and ×200 made with a digital camera attached to an optical microscope and adapted with a measuring device. The data were statistically analyzed with the 2-way ANOVA and Tukey honestly significant difference tests (α=.05). RESULTS: In the internal misfit evaluation, the mean values observed for Ceramill, Lava, and Neoshape were palatal surface 76.5, 65.5, and 77.7 µm (P=.003); angle regions 69.4, 68.6, and 74.5 µm (P=.010); incisal surface 127.7, 97.2, and 182.2 µm (P<.001); and overall mean 72.1, 69.4, and 76.4 µm (P=.003). Significant differences were not found for mesial, distal, or buccal surfaces (P>.05). In the evaluation of marginal misfit (marginal discrepancy and absolute marginal discrepancy), the mean values found were 40.9 and 65.8 µm for Ceramill, 34.2 and 70.0 µm for Lava, and 39.3 and 74.5 µm for Neoshape. No significant differences were found among the 3 systems (P>.05). CONCLUSIONS: Although the Lava system showed a significantly lower value of internal misfit than the Neoshape system, all systems showed clinically acceptable marginal misfit values.

Disúria como manifestação inicial de hipercalciúria idiopática: relato de caso / Dysuria as an initial manifestation of idiopathic hypercalciuria: case report

Objetivo: descrever um caso de hipercalciúria associada a hematúria microscópica que teve disúria como queixa inicial. Descrição: escolar de 5 anos procurou o serviço de emergência com queixa de disúria. Os exames laboratoriais iniciais revelaram a presença de hematúria microscópica persistente e, durante a investigação ambulatorial, confirmara-se os diagnósticos / Objective: to report a case of hypercalciuria associated to microscopic hematuria in which dysuria was the initial complaint. Description: a five-year-old child sought the pediatric emercy service with dysuria. Initial laboratory exams revealed microscopic hematuria and the child was referred to the outpatient clinic, where the diagnosis of idiopathic hypercalciuria associated to hyperuricosuria was confirmed..