• Title/Summary/Keyword: root coverage

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Root coverage using a coronally advanced flap with or without acellular dermal matrix: a meta-analysis

  • Guan, Wei;Liao, Haiqing;Guo, Li;Wang, Changning;Cao, Zhengguo
    • Journal of Periodontal and Implant Science
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    • v.46 no.1
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    • pp.22-34
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    • 2016
  • Purpose: Gingival recession is a major esthetic concern and may lead to root sensitivity during periodontal treatment. Coronally advanced flaps (CAFs) with and without acellular dermal matrix (ADM) are widely used in root coverage procedures. The aim of this study was to analyze the efficacy of CAF in combination with ADM in the treatment of gingival recession. Methods: PubMed, The Cochrane Library, and Embase were used to identify relevant articles. The articles were screened, data were extracted, and the quality of the studies was assessed by three reviewers with expertise in clinical practice, trials, statistics, and biomedical editing. The clinical endpoints of interest included changes in recession, probing depth (PD), clinical attachment level (CAL), and keratinized tissue (KT). Results: Ten randomized controlled trials were identified, including six studies that compared CAFs with ADM and CAFs using connective tissue grafting (CTG) and four studies that compared CAFs with or without ADM. No statistically significant differences were found between the use of ADM and CTG, whereas statistically significant differences were found between groups in which ADM and CAF were combined and groups that underwent CAF alone with regard to recession coverage, CAL, and KT. The combination of CAF with an ADM allograft achieved more favorable recession coverage and recovery of CAL and KT than CAF alone. Conclusions: The results from the ADM and CTG groups suggest that both procedures may be equally effective in clinical practice. Given the limitations of this study, further investigation is needed to clarify the effectiveness of ADM and CAF in clinical practice.

Confidence Intervals for a tow Binomial Proportion (낮은 이항 비율에 대한 신뢰구간)

  • Ryu Jae-Bok;Lee Seung-Joo
    • The Korean Journal of Applied Statistics
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    • v.19 no.2
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    • pp.217-230
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    • 2006
  • e discuss proper confidence intervals for interval estimation of a low binomial proportion. A large sample surveys are practically executed to find rates of rare diseases, specified industrial disaster, and parasitic infection. Under the conditions of 0 < p ${\leq}$ 0.1 and large n, we compared 6 confidence intervals with mean coverage probability, root mean square error and mean expected widths to search a good one for interval estimation of population proportion p. As a result of comparisons, Mid-p confidence interval is best and AC, score and Jeffreys confidence intervals are next.

Growth of Zoysiagrass and Seashore Paspalum on Volcano Eruption Sand and Clayey Soil with Organic and Inorganic Fertilizers in Indonesia

  • Rahayu, Rahayu;Zuamah, Hidayatuz;Yang, Geun-Mo;Choi, Joon-Soo
    • Weed & Turfgrass Science
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    • v.3 no.3
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    • pp.240-245
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    • 2014
  • This study was carried out to determine the possible use of volcano eruption sand at Merapi mountain area compared with clayey soil, alfisol as turfgrass growing media. Indonesia has abundant source of eruption sand and clayey soil. Native zoysiagrass (Z. matrella) was collected from Sleman district and seashore paspalum (P. vaginatum) from Solo region. The experimental plots were treated with both organic and inorganic fertilizers. Zoysiagrass and seashore paspalum can grow on the mixture of eruption volcano sand and alfisol soil. Fertilizers application increased turf color, surface coverage rate and recovery rate of turfgrass. While fertilizer treated alfisol have no effect on the length and dry weight of zoysiagrass root. Mixing of volcano eruption sand on growing media resulted in longer root length, higher shoot dry weight of zoysiagrass than in alfisol soil. Type of fertilizer affected the pH, soil organic matter, total N, available P, available K and electrical conductivity of sand and alfisol after cultivation. Similarly to zoysiagrass, the recovery of seashore paspalum was increased by application of fertilizer, even the inorganic fertilizer showed faster recovery than organic fertilizer. Surface coverage of seashore paspalum was faster than that of zoysiagrass with or without fertilizer.

Interpretability Comparison of Popular Decision Tree Algorithms (대표적인 의사결정나무 알고리즘의 해석력 비교)

  • Hong, Jung-Sik;Hwang, Geun-Seong
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.44 no.2
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    • pp.15-23
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    • 2021
  • Most of the open-source decision tree algorithms are based on three splitting criteria (Entropy, Gini Index, and Gain Ratio). Therefore, the advantages and disadvantages of these three popular algorithms need to be studied more thoroughly. Comparisons of the three algorithms were mainly performed with respect to the predictive performance. In this work, we conducted a comparative experiment on the splitting criteria of three decision trees, focusing on their interpretability. Depth, homogeneity, coverage, lift, and stability were used as indicators for measuring interpretability. To measure the stability of decision trees, we present a measure of the stability of the root node and the stability of the dominating rules based on a measure of the similarity of trees. Based on 10 data collected from UCI and Kaggle, we compare the interpretability of DT (Decision Tree) algorithms based on three splitting criteria. The results show that the GR (Gain Ratio) branch-based DT algorithm performs well in terms of lift and homogeneity, while the GINI (Gini Index) and ENT (Entropy) branch-based DT algorithms performs well in terms of coverage. With respect to stability, considering both the similarity of the dominating rule or the similarity of the root node, the DT algorithm according to the ENT splitting criterion shows the best results.

Soft tissue volume changes following gingival grafting for labial gingival recession in the mandibular anterior area: a case report

  • Song, Young Woo;Jung, Ui-Won;Cha, Jae-Kook
    • The Journal of the Korean dental association
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    • v.58 no.1
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    • pp.8-18
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    • 2019
  • This case report presents results for gingival recession coverage following gingival grafting and for gingival biotype enhancements by visualizing soft tissue volume changes using intraoral three-dimensional scanning. A 28 year old female patient with multiple gingival recessions and a 19 year old female patient with a single gingival recession on mandibular anterior area were treated. Root coverage was performed in both cases using autogenous subepithelial connective tissue harvested from palate. Intraoral 3D scan data were obatained presurgery and at 3 months, 1 year, and 2 years postsurgery. The recession areas were recovered successfully by subepithelial connective tissue graft combined with pedicle flap repositioning, and the patients showed neither further recurrence nor post-operative complication. Soft tissue biotype changes were identified by superimposing and analyzing scan data, revealing that gingival biotype was enhanced in both cases. These cases suggest that SCTG could be advantageous in terms of the gingival biotype enhancement, as well as gingival recession coverage, and intraoral 3D scanning might be suitable for assessing post-surgical gingival biotype change.

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The Effect of Cutting-height on the Growth and Thatch Accumulation m Zoysia japonica (예초고가 Zoysia japonica의 생육과 Thatch축적에 미치는 영향)

  • 이주삼;윤용범
    • Asian Journal of Turfgrass Science
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    • v.5 no.2
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    • pp.75-80
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    • 1991
  • The purpose of this experiment was in order to detect the effect of cutting height on the growth and thatch accumulation in Zoysio japonica Cutting height treatments were 2.5, 3.8, 5.1cm and no cutting, respectively. The results were obtained as follows : 1.Cutting treatments great]y affected to the growth of Zoysia japonica and thatch accumulation. 2.The dry weight of Leaf and shoot had the highest at 5.1cm. So 5.1cm treatment was desirable level for the top growth of Zoysia japonica 3.The dry weight of leaf, shoot, root and coverage of control were obtained the higher than cutting treatments. 4.The dry weight of thatch of control were less than cutting treatments, and 5.1cm treatment were more than tow cutting height. 5.Retationships of dry weight of thatch with thatch depth and C/F ratio were positive significant differences at 5% level. 6. Relationship between dry weight of shoot and coverage showed a positive significant difference at 5% level.

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A Study on Revegetation Measures with Recycling Root-stock of Native Tree(I) (자생 수목 그루터기를 이용한 자연식생복원 녹화공법 연구(I))

  • Oh, Koo-Kyoon;Kwon, Tae-Ho;Bae, Jung-Nam;Park, Seok-Gon
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.6 no.5
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    • pp.28-39
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    • 2003
  • This study was carried out to elucidate effective restoration measures for natural forest with recycling native tree un site from November 2001 to October 2002 to obtain a basic information for revegetation measure, eight experimental treatment was done and the length of stump, root-ball size of stump, antisepsis treatment of trunk cut, Planting season and contents of organic matter in soil were effective on regrowth of root-stock. Thirteen tree species including Quercus acutissima among twenty tree species showed outstanding sprout and survival rate(over 90 percent), Planting in November and combinated planting with 5 trees and 9 shrubs of root-stock per 100$m^2$ plot showed a good growth. And 10 percent of organic matter plot showed a good crown coverage.

Soil Habitat Characteristics of Cicada Nymph in an Urban Apartment Garden (도심 아파트 단지 화단에 나타나는 매미 약충의 토양 서식처 특성)

  • Kim, Keonhee;Kim, Jae Geun
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.14 no.3
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    • pp.47-55
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    • 2011
  • Cicada is a very familiar insect to people but habitat characteristics of them are not well known. To investigate habitat characteristics of cicada nymph, plant species, plant cover, soil hardness, accumulated organic mass, organic content in soil, and root density were investigated at 11 sites in an apartment complex garden in Seoul. Selected sites had different densities of cicada nymph case above the ground. Density of cicada nymph case was positively correlated with accumulated organic mass, organic content in soil, and root density and negatively correlated with soil hardness. Even though shrub coverage was not linearly correlated with the density of cicada nymph case, 80% cover of shrub was necessary for the high density of them. Data in this study suggested that organic matter in addition to root density be the primary limitation factor of cicada nymph and high amount of litter-fall decrease soil hardness through the increase of soil organic matter. This study suggests that the density of cicada nymph can be managed through organic content in soil.

Periodontal plastic surgery for anterior esthetics (전치부 심미치주성형술)

  • Lee, Yong-Moo
    • The Journal of the Korean dental association
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    • v.48 no.12
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    • pp.880-888
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    • 2010
  • Periodontal disease, trauma, deformity of tooth can jeopardize the esthetics of oral and maxillo-facial region. Moreover, increasing the demand and concern about the esthetics, clinicians should place high value on esthetics during periodontal treatment. Analysis of various anatomical considerations; lip line, shape and location of marginal gingiva, and biologic width; and diagnosis should be performed prior to periodontal plastic surgery.