Recession Depth Research Articles

THE EFFECTIVENESS OF PLATELET RICH FIBRIN, CONNECTIVE TISSUE GRAFT AND THEIR COMBINATION IN THE CLOSURE OF GINGIVAL RECESSION: A SYSTEMATIC REVIEW

Introduction: Connective Tissue Graft (CTG) is one of the techniques in gingival recession treatment, but considering the morbidity of using CTG, biomaterials such as Platelet Rich Fibrin (PRF) can be an alternative in gingival recession closure treatment. This systematic review aims to compare and evaluate the use of PRF, CTG and their combination in gingival recession closure. Review: An electronic literature search in Medline (PubMed), Google Scholar, and Elsevier (Sciencedirect) was conducted to identify Randomized Clinical Trial (RCT) reporting on the treatment of gingival recession using PRF, CTG or a combination of both from 2018 to 2023 in English. This systematic review was conducted following the Preferred Reporting Items for Systematic review (PRISMA) guidelines. The parameters assessed in the RCTs were: recession depth (RD), clinical attachment level (CAL), keratinized gingival width and height (KTW, KTH), probing depth (PD), gingival thickness (GT) and patient discomfort after surgery assessed by VAS (Visual Analog Scale). Based on the 1,152 articles retrieved, there were only five RCTs eligible for systematic review. Four articles compared the use of PRF with CTG, and one article compared the use of CTG with the combination of CTG + PRF in gingival recession closure. Conclusion: The use of PRF, CTG, and a combination of both were effective in closing gingival recession. The use of CTG gave better results in increasing gingival thickness and keratinized gingival width compared to the use of PRF, but the combination of CTG and PRF gave significant results in keratinized gingival height and decreasing recession depth compared to the use of CTG alone. Thus, the combination of CTG and PRF may be a more promising gingival recession closure treatment option.

Efficacy of Fibro-Gide® in coronally advanced flap for the treatment of multiple gingival recession: A prospective clinical study

Abstract Aim: The study aims to compare connective tissue graft (CTG) with Fibro-Gide® as an adjunct to the coronally advanced flap (CAF) technique for treating class I and class II gingival recession based on Miller’s classification. Materials and Methods: A total of 30 participants with bilateral Miller’s class I or class II multiple gingival recession contributing to 60 multiple gingival recession sites were enrolled in this prospective clinical study. Recession sites were categorized into two groups. Group 1 (CAF+ CTG; n = 30 sites) and group 2 (CAF+ Fibro-Gide®; n = 30 sites). Clinical parameters, such as gingival recession depth (GRD), probing depth (PD), clinical attachment level (CAL), gingival recession width (GRW), and keratinized tissue (KT) were evaluated at baseline, 3 months, and 12 months. Statistical analysis was performed for intergroup comparison using an independent t test and for intra-group comparison using paired t test. Results: At baseline, the mean GRD for groups 1 and 2 were 3.5 ± 0.8 and 3.4 ± 0.8, whereas GRW for group 1 and group 2 were 3.1 ± 0.1 and 3.1 ± 0.2 respectively. At 12-month follow-up, the reduction in GRD and GRW was statistically significant. The gain of KT accounted to 3.9 ± 5.5 and 3.0 ± 0.8 in group 1 and group 2, respectively, but CAL showed a significant decrease from 5.4 ± 1.02 and 5.4 ± 1.03 to 2.3 ± 0.7 and 2.4 ± 0.7 in group 1 and group 2, respectively. Conclusion: Fibro-Gide® along with CAF improved gingival recession in terms of depth and width as comparable with those of CTG. In terms of KT, CTG has better long-term stability than Fibro-Gide® when combined with the CAF technique in treating multiple gingival recessions.

Free gingival grafting technique for gingival recession coverage: A 6-month follow-up interventional study

Background: Both the practitioner and the patient frequently deal with gingival recession. In Miller’s Classes I and II mandibular gingival recession, the goal of this study was to evaluate the predictability of the free gingival graft (FGG), as a single-step operation in terms of root coverage and esthetics. Materials and Methods: 10 patients between the ages of 25 and 50 who were sent to the Department of Periodontics (3 men and 7 women) made up the study group. There were a total of 14 mandibular recession sites that were chosen. Recession depth (RD), recession width, probing depth (PD), clinical attachment level (CAL), width of attached gingiva (WAG), and visual analog scale (VAS) were assessed at baseline, 3 months, and 6 months post-operatively. Results: The mean RD was 3.13±2.0 mm at the baseline and decreased to 0.80±0.78 mm after 6 months. At baseline, the VAS was 3.52±0.81, and at 6 months after surgery, it had improved to a mean of 6±2.14. From a baseline WAG of 0.35±0.38 to 2.83±0.68 mm, there wasa significant increase with p<0.0001. Six months after surgery, there was an increase in CAL, from 5.63±1.12 to 1.28±0.76 mm. In addition, PD improved from 1.98±0.54 to 0.97±0.36 mm. Conclusion: FGG showed statistically significant gain in recession coverage and had good esthetic score. The technique produced a reliable single-step gain in WAG as well as root coverage in cases of Miller’s Classes I and II gingival recession.

Periodontal health status in systemic sclerosis patients: Systematic review and meta-analysis.

The present systematic review and meta-analysis aimed to evaluate the periodontal health of systemic sclerosis patients compared with non-systemic sclerosis controls. Online databases were searched for eligible studies on February 24, 2023. The primary outcomes of interest in systemic sclerosis patients and controls included the clinical attachment level, periodontal probing depth, recession depth, plaque index, bleeding on probing score, gingival index, number of teeth with periodontitis, prevalence of periodontitis and gingivitis, and extent and severity of periodontitis. Fourteen studies met inclusion criteria and were incorporated in the qualitative and quantitative analysis. In comparison with the controls, systemic sclerosis patients had a higher prevalence of periodontitis (OR = 7.63 (1.74-33.50), p = 0.04, I2 = 69%), including more severe forms of periodontitis (OR = 6.68 (3.39-13.15), p = 0.85, I2 = 0%), as well as higher periodontal probing depth ((0.88 (0.45-1.31), p = 0.02, I2 = 99%)), clinical attachment level (1.22 (0.8-1.64), p = 0.003, I2 = 98%), and plaque presence (0.83 (0.13-1.53), p = 0.03, I2 = 96%). There was no statistically significant difference in gingival inflammation (1.14 (0.07-2.21), p = 0.04, I2 = 98%). The systematic review and the meta-analysis showed that systemic sclerosis patients suffer from worse periodontal health than non-systemic sclerosis individuals.

Clinical Evaluation of Coronally Advanced Flap with or without a Platelet-Rich Fibrin Membrane for the Root Coverage

ABSTRACT Aim: To evaluate “coronally advanced flap” with or without “a platelet-rich fibrin membrane for the root coverage.” Materials and Methods: All the clinical parameters were assessed at different time intervals (at baseline, 1, 3, and 6 months) in both experimental and control group. Following “clinical parameters” were recorded using “UNC-15” “Probe-Plaque Index (PI)” (Silness and Loe, 1964), “Gingival Index” (GI) (Loe and Silness, 1963), “Recession depth (RD),” “Recession width (RW),” “Clinical attachment level (CAL),” and “Width of keratinized gingiva (WKG)”. Results: At final evaluation (i.e., mean change from baseline to 6 months), “the decrease in Plaque Index was 2.5% higher in Group B (66.0%) as compared to Group A (63.5%). The decrease in Gingival Index was 6.1% higher in Group B (91.4%) as compared to Group A (85.3%), and the decrease in recession width was 4.0% higher in Group B (75.2%) as compared to Group A (71.2%). The decrease in clinical attachment level was 4.4% higher in Group B (53.2%) as compared to Group A (48.4%). The increase in width of keratinized gingiva was 1.9% higher in Group A (28.8%) as compared to Group B (26.9%).” Conclusion: The controlled, randomized, split mouth design showed that CAF surgery, either by alone or in combination with PRF, is an efficient treatment method for covering denuded roots. “This design was used to treat bilateral isolated Miller’s class I and II recessions in gingival part. When compared to the CAF approach, the results from a combination of CAF and PRF after a 6-month period showed additional advantages in addition to mean root coverage in the treatment of Miller’s classes I and II recessions in gingival part.”

Efficacy of amniotic membrane with coronally advanced flap in the treatment of gingival recession: an updated systematic review and meta-analysis

ObjectivesThis systematic review aims to evaluate the efficacy of combining the amniotic membrane (AM) with the coronally advanced flap (CAF) in the treatment of Miller class I and II gingival recession (GR).MethodsThe protocol of this updated PRISMA-compliant systematic review was registered in PROSPERO (CRD42023431501). The following treatment outcomes were recorded; recession depth (RD), recession width (RW), width of keratinized gingiva (WKG), and clinical attachment level (CAL). We searched the following databases: MEDLINE, Cochrane Library, Google Scholar, EMBASE, Web of Science, and Science Direct.ResultsTwo independent reviewers screened the selected articles. Twenty-two eligible articles were extracted, with 689 sites of GR in 481 patients. No statistically significant difference was found in RD, RW, WKG, and CAL between (AM&CAF) in comparison to control groups. However, the subgroup analysis showed statistically significant differences in RD between the (AM & CAF) group v/s (CAF) alone (P = 0.004). Moreover, the subgroup analysis of the WKG showed statistically significant differences between (AM & CAF) v/s (CAF&CM) (p = 0.04). Additionally, a statistically significant difference was found in the subgroup analysis of CAL between both (AM & CAF) group v/s (CAF) alone (p = 0.0009).ConclusionWith the limitations of this meta-analysis due to short follow-up periods (6 months), the AM can be considered a viable treatment option for GR defects with satisfactory treatment outcomes comparable to other previously investigated treatment modalities.Clinical significanceWhile AM showed various beneficial properties as an ideal membrane for the coverage of GR, future studies are required to completely understand the potential application of AM in the treatment of GR.

A Short Period Sraffa-Keynes Model for the Evaluation of Monetary Policy

ABSTRACT This paper develops a short period, one sector, Sraffa-Keynes model that can be used for the evaluation of various recommendations outlined in the Post Keynesian monetary policy literature. The model is characterised by the principle of effective demand, Sraffa or target-return pricing (which integrates the determination of key distributive variables and allows for short run cyclical variation in prices), conflict inflation, endogenous money and a basic approach to monetary policy in the Smithin–Wray tradition of fixing the policy rate to achieve low or specified rates of unemployment. The model is calibrated to the Australian economy and subjected to two standard macroeconomic shocks, a demand shock and a cost shock. After each shock, the economy returns to long period equilibrium characterised by the achievement of the target rate of return, desired capacity utilisation and Sraffian prices of production. Active monetary policy that targets employment, reduces the depth and duration of recessions in this model compared to a ‘park-it’ approach but at the cost of increased volatility in income distribution. Flexible prices (where firms respond to the additional costs of running the capital stock at other than full capacity) are shown to have similar effects to monetary policy.

Ta/Al/CuW low temperature ohmic contacts for GaN-on-Si HEMT

We proposed a low temperature Au-free ohmic contacts of GaN-on-Si HEMT with the Ta/Al/CuW metal stack. The CuW was deposited by using the dual-target magnetron sputter deposition method. The annealing conditions and recess depth of ohmic area were systematically investigated. By utilizing the Ta/Al/CuW structure, an improved contact characteristic (0.49 Ω·mm) is obtained following annealing at 550 °C for 10 min in vacuum, with the recess depth of 30 nm(±2 nm). This performance surpasses that of Ta/Al/W Au-free contacts (1.07 Ω·mm). Furthermore, both the Ta/Al/CuW ohmic contacts (RMS = 6.3 nm) and the Ta/Al/W ohmic contacts (RMS = 6.0 nm) exhibit smooth surface morphology. Compared to Ti contact layer, Ta demonstrates superior performance in low temperature contact and breakdown test. Amorphous Ta layer can effectively suppress Cu diffusion. The GaN-on-Si HEMT was also fabricated based on Ta/Al/CuW Au-free ohmic contacts, exhibiting excellent DC characteristics.

Comparative Evaluation of Coronally Advanced Flap with and without Amniotic Membrane in the treatment of Localised Miller’s Class I and Class II Gingival Recession Defects: A Randomised Controlled Trial

Introduction: Gingival recession is the exposure of the root surface of the tooth, characterised by the displacement of the gingival margin apically from the Cementoenamel Junction (CEJ). Various techniques have been suggested for treating recession, such as Free Gingival Graft (FGG), Connective tissue grafts, laterally or Coronally Advanced Flaps (CAF), and Guided Tissue Regeneration (GTR)-based procedures. Different membranes have been used for GTR, one of which is the amnion membrane. Aim: To evaluate root coverage using Coronally Advanced Flap (CAF) with and without amniotic membrane in the treatment of localised gingival recession. Materials and Methods: A randomised controlled trial was conducted at Pandit Deendayal Upadhyay Dental College and Hospital, Solapur, Maharashtra, India from March 2017 to February 2018. In this study, 30 teeth were treated, with 15 teeth undergoing CAF with amniotic membrane (Group IITest Group) and 15 teeth treated with CAF without amniotic membrane (Group I-Control Group). Probing Depth (PD), Clinical Attachment Level (CAL), Relative Attachment Level (RAL), Recession Width (RW), Recession Depth (RD), Width of Keratinised Gingiva (WKG), Width of Attached Gingiva (WAG), and gingival biotype were assessed between baseline and after three months. Statistical analysis was performed using paired t-test, independent t-test, and Mann-Whitney U-Test. Statistical Package for Social Sciences (SPSS) software version 20.0 was used for analysis. The α error of 5% (p-value=0.05) and β error of 20% were taken into consideration. Results: The mean age of the study population was 30.36±4.55 years, with 18 males and 12 females. There was a decrease in RD, RW, PD, and a gain in CAL and RAL in both groups after three months compared to the baseline values. Additionally, there was an increase in WKG, WAG, and a significant change in the thickness of the gingival biotype from thin to thick in both groups at the end of three months. On inter group comparison, the changes in PD (p-value=1.00), RD (p-value=1.00), RW (0.176), CAL (0.664), RAL (1.00), WKG (p-value=0.313) were not statistically significant at the end of three months. WAG was higher in Group II compared to Group I (p-value=0.014*), and the mean root coverage was greater in Group II (15.62%) than in the control group (11.642%) (p-value=0.005) at the end of three months. There was a statistically significant difference (p-value=0.005*) in Group II (15.62%) compared to the control group (11.642%). Conclusion: Amniotic membrane in combination with CAF proves to be a successful option for root coverage in localised recession defects. However, histological evidence and a greater number of future longitudinal studies are necessary to study the efficacy of this approach.

Comparison of tunnel and VISTA techniques for multiple gingival recession treatment: A systematic literature review.

Gingival recession (GR) has become one of the most common concerns in oral mucosal diseases. It causes discomfort such as root hypersensitivity, root caries, and aesthetic problems, leading to the development of various surgical techniques to address GRs. This study compared the non-advanced tunnel and m-VISTA techniques in treating multiple GRs. A literature search related to the efficiency of non-advanced tunnel and m-VISTA techniques was conducted in MEDLINE (PubMed), EMBASE (ScienceDirect), Cochrane Central Register of Controlled Trials (Cochrane Library), Springer Link, and Google Scholar. Randomized controlled trials (RCTs) reporting periodontal parameters published in the recent four years (2019-2023) were included and assessed for the risk of bias. All in vitro, animal, pilot studies, case reports, and case series were excluded. Five RCTs were included with 195 cases of GRs. Comparing the two techniques revealed a significant increase in keratinized tissue width (KTW) from baseline to 6 months (-1.4 mm), in clinical attachment level (CAL) (-2.65 mm), and in recession depth (-2.7 mm) for the tunnel technique. On the other hand, a significant increase in GR width (-2.26 mm) was found in the m-VISTA group. Finally, there were no significant differences in probing depths. Both techniques were effective in root coverage and may be valuable for treating multiple GRs.

Novel Membrane for the Treatment of Multiple Gingival Recession Defects-RCT

Objective Evaluation and comparison of Collagen Matrix Ossixreg Volumax and Subepithelial connective tissue graft SCTG in combination with modified coronally advanced flap MCAF in the treatment of Miller Class I and II multiple gingival recession defects MARDs.Methods Twelve patients presenting adjacent Miller Class I and II maxillary and mandibular gingival recession defects participated in this randomized controlled study. A total of sixty defects were received n 30 either Ossix Volumax collagen matrix VCMX and MCAF test group or MCAF and Subepithelial connective tissue graft control group n 30. Parameters like gingival recession depth gingival recession width probing depth clinical attachment level and keratinized tissue width were checked at baseline 6 weeks 3 months and at 6 months after treatment. P value lt0.05 was considered statistically significant.Results The percentage of complete root coverage was 80 for the test group and 60 for the control group. The percentage of mean recession coverage for the test group was 60 and the control group was 85. Adjacent gingival recession was successfully treated with MCAF and Ossixreg Volumax or with MCAF and SCTG. The use Ossixreg Volumax was more comfortable during the postoperative period.Conclusion We suggest the use of Ossixreg Volumax as a promising collage matrix for the treatment of MARDs.

Morphological and Electrical Characterization of AlGaN/GaN Heterostructures Modified By Atomic Layer Etching

Modern microelectronic components for high-power and high-frequency applications based on III-V compound semiconductors offer high break down voltage (GaN: 5 MV/cm and AlN: 15 MV/cm) at low specific on-resistance. However, it requires reliability and reproducibility of the production processes. Going to higher frequencies (5 GHz and beyond) and more integration in consumer electronics, smaller structure sizes are needed. This is going along with increasing demands on the manufacturing processes like dry etching. The main goal is to reach smaller and high controllable etching rates, going down to single atomic layers, low damage, and minimized surface roughness. Atomic layer etching (ALE) represents a key technology in order to achieve such requirements.An ALE process consists of two independent steps forming a repeatable cycle with a specific etching amount per cycle (EPC). First a surface modification is done by a chemical precursor i.e., adsorbing or oxidizing the surface. The second step is the removal of the modified layer, either physically by low energy non-reactive ion bombardment (Plasma Enhanced ALE [PEALE]) or chemically by a reactive species (Thermal ALE). The two steps are separated by an inert gas purge. This purging grants the removal of the chemistry after the first step, preventing further chemical reaction and transporting the chemical products out of the chamber after the second step.In this study, a PEALE conducted on different tools is used, for gate and contact recess study in a AlGaN/GaN heterostructure to form high electron mobility transistors (HEMT) with reduced ohmic contact resistance and threshold voltages. The results show a reduction of ohmic contact resistance at reduced forming temperatures and a linear dependence of the threshold voltage on gate recess depth. In order to determine the etching rate and roughness, atomic force microscopy (AFM) measurements were performed.The PEALE module is either integrated into a cluster tool consisting of atomic layer deposition (ALD) and chemical vapor deposition (CVD) or done in a combined ALD/ALE chamber. This opens the possibility of etching and depositing in-situ, reducing contamination and degradation of the substrate material.By this means, metal insulator semiconductor (MIS)-HEMTS with a recessed gate are studied. The monitoring of the individual processes is achieved by test structures like transfer length method structures (TLM) and metal oxide semiconductor (MOS), which showed the improved electric performance of these devices and may indicate unwanted interface issues, respectively. Additional, pre- and post-treatments could improve the interfaces further. The results will be presented and discussed in terms of ALE process development and optimization.This work was financially supported within the ALEStar project by the government of the Free-state of Saxony and the European Regional Development Fund under grant no. SAB 100402929.

Effectiveness of the periodontal dressing upon periodontal parameters during treatment of gingival recession by free gingival graft

Background:Various grafting procedures have been used to convert a thin periodontal phenotype to a thick phenotype, including free gingival graft.Objective:To evaluate the effectiveness of the periodontal dressing upon periodontal parameters such as Pocket depth, width of keratinized gingiva and recession depth during treatment of the Miller class I, II or III gingival recession of the lower anterior teeth. Materials andMethods:34 lower anterior teeth with Miller class I, II or III gingival recession were selected and randomly grouped into two groups. The first group included 19 teeth and was treated with a single-step free gingival graft procedure with the application of the periodontal dressing. The second group had 15 teeth and was treated with a single-step free gingival graft (FGG) procedure without applying the periodontal dressing. Clinical parameters such as probing depth, the width of keratinized gingiva and recession depth were recorded before surgery (B0), two weeks (B1) and three months (B2) after surgery. Results:No significant differences (P>0.05) in PD were observed in both groups at different time intervals and between both groups at two weeks and three months after surgery. However, a significant reduction (P<0.05) in RD in both groups at two weeks and three months after the surgery was seen. Also, both groups saw a significant decrease (P<0.05) at two weeks and three months after surgery. WKG was significantly (P<0.05) increased at two weeks and three months after the surgery in both groups. The difference in the increase was highly significant (P<0.001) between both groups at 2-weeks and 3-months after the surgery.Conclusions:The group that used periodontal dressing at 2-weeks and 3-months after surgery reported greater improvements in root coverage and increased width of keratinized gingiva compared to those who did not use periodontal dressing.

Electrochemical investigation on localised corrosion under silica sand deposit layers of carbon steel within a bespoke test cell

The corrosion behaviour of deep pit-like features on carbon steel under silica sand deposits has been evaluated using a bespoke localised corrosion cell. Local pH and electrochemical measurements were performed, including impedance spectroscopy and galvanic coupling. The corrosion rate of X65 carbon steel at four different recession depths up to 9 mm was evaluated in the presence and absence of a ∼8 mm-thick silica dioxide deposit layer, in a carbon dioxide-saturated environment. The deposit reduced corrosion rates to approximately 1 mm·yr−1 and iron carbonate formed on the steel surface under the deposit due to an increase in local pH.

Influence of window recess on solar loads, heat loss and external condensation

The current architectural preference for the recess of windows is in line with the forefront of the building facade. The recess of a window has consequences for: solar loads, heat loss, and risk of outside condensation. This paper presents an analysis of these issues in relation to variations in recess depth and differences in orientation of the window. The solar load in buildings is highly influenced by the depth of the window recess, depending on the orientation. Solar gains both contribute to heating the building during the heating season, but also to overheating in other periods. The latter being especially important for other buildings than residential buildings. This is analysed for different window orientations and size (height and width) as wells as the recess depth. Recess depth also influences the overall heat loss though the facade and window and is analysed through detailed calculations. Last, but not least, condensation on the external face of modern low energy windows causes a serious issue regarding visual comfort in the mornings during periods with clear weather and low outdoor temperatures. Analyses of the recess depth influence on the outside condensation risk is presented. The issues regarding the recess depth for facade windows is analysed using dynamic simulations of different window and recess depths in different orientations in combination with 2D static calculations of the overall heat loss coefficient for the total window and facade construction in typical highly insulated facade constructions.

THE WORLD IS ON THE THRESHOLD OF A NEW FINANCIAL AND ECONOMIC CRISIS

The paper provides an analysis of the current state of the world economy and a short-term forecast of its development. It is shown that the USA and the EU have become the epicenter of a new financial and economic crisis and today their economies are already in a state of stagflation, characterized by high inflation and low growth rates. The tightening of monetary policy, through aggressive increases in key interest rates by the Federal Reserve and the ECB, to curb inflation and reduce it to the target level of 2% per annum, led to a sharp reduction in investment in the economy, which, in turn, will cause recessions in 2024 with a recession depth of 1.2–1.4% in the US economy and 1.9–2.1% in the EU economy. Vanguard developing countries will only slow down slightly, and their leaders, China and India, will maintain high rates of economic growth at 4.5 and 6% per year, respectively, in the medium term. The crisis will lead to a cascade of defaults among heavily indebted, low-income developing countries. As a result, the crisis will also engulf the global economy, significantly reducing its growth rate from 5.2% in 2022 to 1.7% in 2024, with a sharp decline in global trade volumes. Recommendations are given that can contribute to a quick and successful exit from the current crisis.

Clinical efficacy of Vestibular Incision Subperiosteal Tunnel Access (VISTA) for treatment of multiple gingival recession defects: a systematic review, meta-analysis and meta-regression.

This study investigated the efficacy of Vestibular Incision Subperiosteal Tunnel Access (VISTA) compared to other methods for treating multiple adjacent gingival recessions (MAGRs) through a systematic review and meta-analysis. A systematic literature search was performed through June 2023, to identify clinical trials investigating VISTA for root coverage on MAGRs. A meta-analysis with meta-regression model was employed on the primary outcomes of mean and complete root coverages (MRC, CRC), comparing VISTA with other techniques. Clinical efficacy of various graft materials was assessed. Fourteen studies were included, 8 of which met the criteria for quantitative assessment. The cumulative MRC (88.15% ± 20.79%) and CRC (67.85% ± 21.72%) of VISTA were significantly higher compared to the tunneling technique (SMD = 0.83 (95% CI [0.36, 1.30], p < 0.01). The baseline recession depth showed a negative correlation with CRC, whereas baseline keratinized gingiva width exhibited a positive correlation with this outcome. The VISTA technique, particularly with acellular dermal matrix (ADM) or connective tissue graft (CTG) materials, offers superior outcomes compared to the tunneling technique. The capacity of platelet-rich fibrin (PRF) to substitute for connective tissue graft (CTG) in VISTA-root coverage was noteworthy, provided there is adequate keratinized tissue width. VISTA in concert with acellular dermal matrix or CTG resulted in improved root coverage, surpassing the outcomes achieved through tunneling. PRF emerged as a viable alternative to CTG, when used in conjunction with VISTA, demonstrating comparable mean root coverage. This is particularly evident in situations where sufficient keratinized gingiva is available and when patient comfort is taken into consideration.

Leukocytic platelet rich fibrin (L-PRF) versus subepithelial connective tissue graft (SCTG) using tunneling technique in treatment of gingival recession: Randomize controlled clinical study

Introduction: Gingival recession is a problem encountered daily in clinical practice, its etiology is often a multifactorial one. Surgical treatment is the only method to reverse this condition. Objective: to evaluate the effectiveness of leukocytic platelet rich fibrins (L-PRF) versus subepithelial connective tissue graft (SCTG) in the management of recession defects Miller’s class I or II (RT1) using the tunnel technique (TUN). Methods: 20 systemically healthy patients were allocated randomly to TUN with L-PRF (group A), and TUN with SCTG (group B). Probing depth, clinical attachment level, recession depth, width of keratinized tissue, gingival thickness, and recession esthetic score and wound healing index are clinical variables measured at baseline,14 days, 3 months, and 6 months postoperatively. Results: Significant improvement in mean CAL, and RD for both groups, and significant difference in GT and WKT for group B as well as higher RES. A significant difference was also recorded in group A for WHI Conclusions: Both grafting modalities in combination with tunnel technique improved gingival phenotype switching. Although SCTG gives higher esthetic and functional results including better color matching, tissue contour and increased width of keratinized tissue, L-PRF has superior healing properties and can be used as an alternative to treat multiple gingival recession defects where the need of second surgical site is eliminated.

Validation of Ablation and Thermal Response Model for Three-Dimensional Multifunctional Ablator

A semi-empirical physics-based ablation and thermal response model was developed for the 3-Dimensional Multifunctional Ablative Thermal Protection System (3D-MAT) material. Model validation was achieved through comparison between computation and available data obtained in the arc-jet test series, which were conducted at NASA Ames Research Center from 2014 to 2020. The charring ablator simulations for arc-jet test models presented in this work were computed by the Two-Dimensional Implicit Thermal Response and Ablation (TITAN) code, and the Data-Parallel Line Relaxation Method (DPLR) code was used for arc-jet flow simulations to estimate the arc-jet stream total enthalpy and define the aerothermal boundary conditions over the test model surface for TITAN simulations. Because of low surface catalytic efficiency of 3D-MAT char, the exact surface heating could not be determined. Thus, three different types of boundary conditions, including 1) fully catalytic surface heating, 2) noncatalytic surface heating, and 3) surface temperature and recession, were used in the TITAN simulation for model validation. The predicted surface and in-depth temperature history for arc-jet test models were compared with pyrometer and thermocouple data, and the predicted test model surface recession and char depth were compared against the posttest measurements.

Comparative Evaluation of Vestibular Incision Subperiosteal Tunnel Access (VISTA) Technique With and Without Advanced Platelet Rich Fibrin for Treatment of Maxillary Anterior Gingival Recessions.

Gingival recession is an apical shift of the gingival margin with exposure of the root surface to the oral cavity which creates an aesthetic problem. The present study was attempted to compare Vestibular incision subperiosteal tunnel access (VISTA) with and without Advanced platelet rich fibrin(A-PRF) in the treatment of Miller's class I gingival recessions. 24 patients were assigned randomly either to test (VISTA with A-PRF) or control (VISTA alone) group. Clinical parameters like recession depth (RD), recession width (RW), clinical attachment loss (CAL), width of keratinized gingiva (WKG), gingival thickness (GT) and probing depth (PD) were recorded at baseline,3 and 6 months post operatively. Inter group comparison of mean RC in mm, %RC, ΔWKG and CAG revealed no statistically significant difference (p>0.05). Change in GT showed statistically significant improvement in test group. Within the limitations of this study, both treatment options (VISTA with A-PRF and VISTA alone) have resulted in predictable and comparable root coverage with increased gingival thickness in the test group.