Academic literature on the topic 'Apical seal'
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Journal articles on the topic "Apical seal"
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Amlani, Harsh. "Microleakage: Apical Seal vs Coronal Seal." World Journal of Dentistry 4, no. 2 (2013): 113–16. http://dx.doi.org/10.5005/jp-journals-10015-1215.
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ABSTRACT Microorganisms can reach the dental pulp through the open cavity, dentinal tubules, gingival sulcus, periodontal ligament through a broken occlusal seal or faulty restoration of tooth previously treated by endodontic therapy or extension of a periapical infection from adjacent infected teeth. During operative procedures, these possible paths must be considered to prevent ingress. While endodontic therapy is being performed, these paths must be blocked to avoid contamination during and after the treatment. Well treated tooth might also fail if microorganisms reach the periradicular tissues. After root canal obliteration, care must be taken to ensure maintenance of the coronal as well as apical seal from contaminants. How to cite this article Amlani H, Hegde V. Microleakage: Apical Seal vs Coronal Seal. World J Dent 2013;4(2):113-116.
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Loeck, M., J. Becker, and P. Reichart. "Apical seal problems in therapeutics replantations." International Journal of Oral and Maxillofacial Surgery 17, no. 2 (April 1988): 146. http://dx.doi.org/10.1016/s0901-5027(88)80183-8.
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Stock, C. "Endodontics--position of the apical seal." British Dental Journal 176, no. 9 (May 1994): 329. http://dx.doi.org/10.1038/sj.bdj.4808442.
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Zogheib, Carla, and Etienne Medioni. "Evaluation of Apical Filling after Warm Vertical Compaction using Two Different Endodontic Materials: Resilon® and Gutta-Percha." World Journal of Dentistry 3, no. 2 (2012): 166–70. http://dx.doi.org/10.5005/jp-journals-10015-1150.
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ABSTRACT Forty-eight extracted maxillary anterior teeth instrumented with ProTaper system to apical preparations 0.25, 0.40 and 0.60 mm (n = 16 each) were divided into six groups for filling as following: Group 1: Apical preparation 25/100 + gutta-percha/AH Plus sealer, group 2: Apical preparation 25/100 + Resilon/Real Seal, group 3: Apical preparation 40/100 + gutta-percha/AH plus sealer, group 4: Apical preparation 40/100 + Resilon/Real Seal, group 5: Apical preparation 60/100 + gutta-percha/AH plus, group 6: Apical preparation 60/100 + Resilon/Real Seal. All teeth were filled using the warm vertical technique. Horizontal sections at 1, 2 and 3 mm from the apex were observed by SEM under 200 × magnification. Sections were digitally photographed under a stereomicroscope and the images were transferred to a compatible PC for image analysis. The surface area of voids were calculated and compared at all levels; using the Kruskal-Wallis test with Sidak correction and Mann-Whitney U test (p > 0.05). Comparisons within each group (gutta-percha/AH plus and Resilon/Real Seal) showed the presence of voids but there was no significant difference between any level of sectioning for apical preparations of 25 and 40 (p > 0.05). The only difference was in the groups prepared to size 60 and filled with Resilon/ Real Seal which showed significantly more voids than the group filled with gutta-percha/AH plus and especially at the 3 mm level. Conclusion The system Resilon/Real Seal did not achieve better results in terms of sealing ability in the apical third when compared to the conventional gutta-percha/AH plus sealing system. How to cite this article Zogheib C, Naaman A, Medioni E. Evaluation of Apical Filling after Warm Vertical Compaction using Two Different Endodontic Materials: Resilon® and Gutta-Percha. World J Dent 2012;3(2):166-170.
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Suchina, John A., and John R. Ludington. "Dowel space preparation and the apical seal." Journal of Endodontics 11, no. 1 (January 1985): 11–17. http://dx.doi.org/10.1016/s0099-2399(85)80100-x.
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Arora, Suraj, Priyanka Saluja, Shugufta Mir, ShashitS Bavabeedu, AnshadM Abdulla, and SuheelM Baba. "Relation between apical seal and apical preparation diameter: An in vitro study." Journal of Pharmacy And Bioallied Sciences 12, no. 5 (2020): 332. http://dx.doi.org/10.4103/jpbs.jpbs_97_20.
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Kaur, H., S. Chaudhary, and P. Tangde. "MTA : Boon to Apexification." Journal of Oral Health and Community Dentistry 7, no. 2 (2013): 114–18. http://dx.doi.org/10.5005/johcd-7-2-114.
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ABSTRACT A significant problem associated with the endodontic treatment of necrotic teeth with open apices is achieving an acceptable seal in the apical area to allow compaction of root filling material. The procedure to create an apical barrier with a hard tissue at the root end is termed as Apexification. Calcium hydroxide is currently the most accepted material for the same. Because of the certain inadequacies associated with Calcium hydroxide Apexification, employing of an apical plug using MTA (Mineral Trioxide aggregate) has gained popularity in recent years. This article is thus an insight to the evolution and recent trends in Apexification.
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Jafarzadeh, Hamid, Zahed Mohammadi, Sousan Shalavi, and Jun-Ichiro Kinoshita. "Establishing Apical Patency: To be or not to be?" Journal of Contemporary Dental Practice 18, no. 4 (2017): 326–29. http://dx.doi.org/10.5005/jp-journals-10024-2040.
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ABSTRACT Introduction The apical portion of the root canal is very complex and challenging during endodontic treatment. Root canal preparation and obturation to the apical constriction may provide the best prognosis. Incomplete debridement, foramen transportation, and inadequate seal in the apical portion are considered to be responsible for treatment failure. The technique “apical patency” is considered as a way for maintaining the apical part the free of the debris by recapitulation, using a small K-file through the area of the apical foramen. This term was firstly proposed by Buchanan. In this technique, the smallest diameter file is set 1 mm longer than working length and recapitulated after each instrument to prevent packing of debris in the apical part. Apical patency has been found to be effective in achieving an apical seal with gutta-percha. Teeth prepared with a step back method and with maintained apical patency may show less leakage when obturated with cold lateral condensation technique. Data regarding the effect of apical patency on the healing of periapical tissue are very scarce, and it has been shown that the patency file has detrimental effect on the healing of periapical tissues in animal studies. However, using patency file in endodontic treatment is controversial and further studies are needed. The purpose of this article is to review the effect of using a patency file on the extrusion of root canal contents, the apical seal, postoperative pain, and healing of periapical tissues. Furthermore, the effect of establishing patency on reaching irrigation solutions to the apical portion of the canal and prognosis of root canal treatment are discussed. Clinical significance How to cite this article Mohammadi Z, Jafarzadeh H, Shalavi S, Kinoshita J-I. Establishing Apical Patency: To be or not to be? J Contemp Dent Pract 2017;18(4):326-329.
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Yildirim, Tahsin, and Nimet Gencoglu. "Use of Mineral Trioxide Aggregate in the Treatment of Large Periapical Lesions: Reports of Three Cases." European Journal of Dentistry 04, no. 04 (October 2010): 468–74. http://dx.doi.org/10.1055/s-0039-1697867.
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Pulpal and periradicular pathosis are the result of microbial, mechanical, or chemical invasion. Microorganisms are the main irritants of pulpal and periapical tissues. The goal of the obturation is to obtain a fluid-tight seal of the root canal system from its coronal aspect through its apical extent to preserve from the irritants.. Root apices have morphological irregularities in teeth with periapical lesions. Therefore, it is more difficult to produce hermetically apical stop with conventional guttapercha obturation techniques. This case report describes the treatment and six years follow-up of the teeth with large periapical lesion using MTA as apical filling material. (Eur J Dent 2010;4:468- 474)
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Monsef, M., K. Hamedzadeh, and A. Soluti. "OR 15 Effect of apical patency on the apical seal of obturated canals." Journal of Endodontics 23, no. 4 (April 1997): 253. http://dx.doi.org/10.1016/s0099-2399(97)80072-6.
Full textDissertations / Theses on the topic "Apical seal"
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Ferguson, David B. "The Effect of Chlorhexidine Gluconate as an Endodontic Irrigant on the Apical Seal: Long-term Results." VCU Scholars Compass, 2003. http://scholarscompass.vcu.edu/etd/1408.
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The purpose of this study was to determine whether chlorhexidine gluconate (0.12%), used as an endodontic irrigating solution would affect the apical seal of three root canal cements. One hundred extracted human single-canal teeth were divided into 9 experimental groups of 10 teeth each, in addition to a positive and negative control group of 5 teeth each. The teeth were decoronated at the level of the cementoenamel junction, accessed, instrumented to a Master Apical File #50, irrigated with either sterile saline, 5.25% NaOCl or 0.12% chlorhexidine gluconate, and dried using paper points. Obturation was accomplished using lateral condensation and one of three endodontic sealers: Roth's 811, AH26, or Sealapex. Post-obturation apical leakage was measured at 270- and 360-day observation periods using the fluid filtration method. Using the mixed-model repeated-measures ANOVA test with Tukey's HSD multiple comparison procedure, the results showed the saline-Sealapex combination had significantly more leakage (p<0.05) than either the Peridex-Sealapex or saline-Roth's combinations at 270 days. No other significant differences were noted between any sealer-irrigant combination at 270 days. The saline-Sealapex combination had significantly more leakage than the saline-Roth's combination at 360 days. No other significant differences were noted at 360 days. Under the conditions of this study, chlorhexidine gluconate irrigant did not adversely affect the apical seal of three root canal cements at 270 and 360 days.
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Netto, Cacio de Moura. "Análise da qualidade do selamento apical de canais radiculares irradiados com os lasers de Nd:YAG, diodo ou ER:YAG e obturados com os cimentos resinosos AH Plus, EndoREZ®, Epiphany® ou Epiphany SE®." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/23/23145/tde-08042009-150614/.
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O objetivo deste estudo foi analisar a influência da irradiação com lasers de alta intensidade antes da obturação de canais radiculares com cimentos endodônticos resinosos no selamento apical. Raízes permanentes humanas (n=168) foram endodonticamente tratadas e, então, divididas aleatoriamente em quatro grupos experimentais (n=42), de acordo com o tratamento dentinário subsequente. Os grupos foram: GØ (controle) sem tratamento adicional; GN irradiado com o laser de Nd:YAG (1,5 W, 100 mJ, 15 Hz); GD irradiado com o laser de diodo (2,5 W em modo contínuo); GE irradiado com o laser de Er:YAG (1 W, 100 mJ, 10 Hz). Dois espécimes de cada grupo foram preparados para avaliação em microscopia eletrônica de varredura (MEV) convencional para observação morfológica da superfície dentinária apical. Os espécimes remanescentes de cada grupo foram aleatoriamente divididos em quatro subgrupos (n=10), de acordo com o cimento obturador utilizado (AH Plus, EndoREZ®, Epiphany® ou Epiphany SE®). Para a análise de infiltração, os espécimes foram imersos em solução amoniacal de nitrato de prata a 50 % (pH=9,5) por 24 horas. Os valores de infiltração apical, em mm, foram comparados pela ANOVA, seguido pelo teste de Tukey (p<0,05). Cinco secções de cada subgrupo foram aleatoriamente selecionadas e analisadas em MEV em modo ambiental para avaliar a adaptação e penetração do material obturador nas paredes dentinárias. As imagens em MEV ambiental foram classificadas em escores por três avaliadores calibrados. A concordância interexaminadores foi confirmada pelo teste Kappa e os escores foram comparados pelo teste de Kruskal-Wallis (p<0.05). No grupo controle, o cimento EndoREZ® apresentou infiltração de nitrato de prata significantemente menor que todos os outros cimentos (p<0,05), com exceção do Epiphany®. A irradiação com os lasers de Nd:YAG e de diodo diminuiu a infiltração média dos subgrupos obturados com o cimento AH Plus (p<0,05). A irradiação com o laser de Nd:YAG levou a um aumento do nível de infiltração nos subgrupos obturados com EndoREZ® e Epiphany SE®. A adaptação, bem como a penetração dos cimentos, não foram prejudicadas pela prévia irradiação com laser dos canais radiculares, independentemente do laser utilizado.The aim of this study was to analyze the influence of intracanal high intensity laser irradiation prior to root canal filling with resin based endodontic sealers on the apical sealing. Human dental roots (n=168) were endodontically treated and then randomly divided into four experimental groups (n=42), according to the further dentin surface treatment. The groups were: control (GØ) received no further treatment; GN irradiated with Nd:YAG laser (1.5 W, 100 mJ, 15 Hz); GD irradiated with diode laser (2.5 W in continuous way) and GE irradiated with Er:YAG laser (1 W, 100 mJ, 10 Hz). Two specimens of each group were prepared for conventional scanning electron microscopy (SEM) for morphological observation of the apical dentin surface. The remaining specimens of each group were randomly divided into four subgroups (n=10), according to the sealer used for dental root filling as follows: AH Plus, EndoREZ®, Epiphany® or Epiphany SE®. For leakage analysis, the specimens were immersed into 50 % silver nitrate ammoniacal solution (pH = 9.5) for 24 hours. The values of apical leakage, in mm, were compared by ANOVA followed by Tukeys test (p<0,05). Five sections of each subgroup were randomly selected and analyzed using environmental SEM in order to evaluate the adaptation and penetration of the filling material into the dentin walls. The environmental SEM images were scored by three calibrated examiners. The inter-examiners agreement was confirmed by Kappa test and the scores were compared by Kruskal-Wallis test (p<0.05). At the control group, the EndoREZ® sealer led to significantly smaller silver nitrate leakage in comparison to the others sealers (p<0,05), except by Epiphany®. The irradiation with Nd:YAG and diode lasers reduced the mean leakage of the subgroups filled with AH Plus sealer (p<0,05). Nd:YAG laser irradiation led to a leakage level increase of the subgroups filled with EndoREZ® and Epiphany SE®. The adaptation as well as sealer penetration were not impaired by the root canal prior laser irradiation, independently of the laser used.
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Van, der Merwe Carel. "In vitro evaluation of root canals obturated with four different techniques." Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-01252010-105530/.
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Akisue, Eduardo. "Avaliação da resposta inflamatória periapical resultante da infiltração coronária em dentes de cães obturados com diferentes cimentos resinosos e técnicas obturadoras." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/23/23135/tde-28042009-100656/.
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Considerando-se a necessidade da obturação tridimensional e o adequado selamento marginal do sistema de canais radiculares, como fatores decisivos para o êxito da terapia endodôntica, este estudo objetivou avaliar as respostas inflamatórias periapicais resultantes da infiltração coronária em dentes de cães obturados com diferentes cimentos resinosos (AH Plus®, RealSeal® e RealSeal SE®) e técnicas obturadoras (condensação lateral e termoplástica). Para tanto, pré-molares e incisivos centrais e laterais de 5 cães tiveram o tratamento endodôntico realizado empregando-se limas de NiTi e creme de Endo PTC associado ao hipoclorito de sódio a 1%, estabelecendo-se como limite de instrumentação à distância de 1mm a 1.5mm aquém do vértice radiográfico. A seguir os condutos foram obturados de acordo com os grupos experimentais (n=12) e grupos controles (n=10): GI- AH Plus/condensação lateral, GII- AH Plus/termoplástificação, GIIIRealSeal/ condensação lateral, GIV- RealSeal/ termoplástificação, GV- RealSeal SE/condensação lateral, GVI- RealSeal SE/ termoplástificação, Grupo controle positivo e Grupo controle negativo. As cavidades coronárias ficaram expostas ao meio bucal por um período de 75 dias e, passado este período experimental, os cães foram eutanásiados por superdosagem de anestésico. Foi realizada a remoção cirúrgica das partes correspondentes aos pré-molares e incisivos da maxila e da mandíbula, fixação das mesmas em solução de formol a 10% por 72h e desmineralização em solução de ácido fórmico a 20% + citrato de sódio a 10% pelo período mínimo de 90 dias. Posteriormente, realizou-se a rotina histológica com cortes seriados com espessura de 6m e estes foram corados com hematoxilina e eosina (HE). Cada corte histológico foi digitalizado e analisado em relação à existência de patologia periapical por três avaliadores independentes. Os dados obtidos foram confrontados estatisticamente utilizando o teste de Kruskal-Wallis seguido do teste comparativo de Dunn, observando-se que em relação às técnicas, a termoplástificação por ondas contínuas de condensação associada à técnica de injeção mostrou melhores condições periapicais quando comparada à técnica de condensação lateral (p=0.0055), sendo que a utilização desta técnica resultou em reações inflamatórias mais intensas para o cimento RealSeal SE (p=0.002). Em relação aos cimentos avaliados, o RealSeal SE mostrou-se menos eficaz em evitar a percolação, produzindo maiores níveis de inflamação crônica independentemente do sistema de obturação (p=0.0088).Considering the need for three-dimensional obturations and adequate marginal sealing of the radicular canal system as being decisive factors for successful endodontic therapy, this study had as its objective the evaluation of periapical inflammatory responses resulting from coronary infiltration in dog\'s teeth obturated using different resin sealers (AH Plus, RealSeal and RealSeal SE) and different obturation techniques (lateral condensation and thermoplastic). For this study, premolars, central and lateral incisors from five dogs had endodontic treatment employing NiTi files and Endo PTC cream associated with 1% sodium hypochlorite. The working length was established at a distance of 1.0 to 1.5mm short of the radiographic apex. After this, the teeth were obturated according to their experimental groups (n=12) and control groups (n=10). The groups were defined as follows: GI - AH Plus/lateral condensation, GII - AH Plus/thermoplastic, GIII - RealSeal/lateral condensation, GIV - RealSeal/thermoplastic, GV - RealSeal SE/lateral condensation, GVI - RealSeal SE/ thermoplastic, a positive control group and a negative control group. The coronal access were left exposed to the oral environment for a period of seventy-five days, and after this experimental period, the dogs were euthanized by anesthetic overdose. The parts corresponding to the premolars and the maxilar incisors were surgically removed. These were then submitted to a solution of 10% formol for 72 hours and then demineralized in a solution of 20% formic acid and 10% sodium citrate for a minimum period of ninety days. Before hand, a histological routine of serial cuts having a width of 6m was undertaken and these were colored with hematoxilin and eosin (HE). Each histological cut was digitalized and analyzed with respect to the existence of periapical inflammation by three independent evaluators. The data obtained was statistically compared, firstly using the Kruskal-Wallis test and then the comparative Dunn test, where it was noted that in relation to the techniques, thermoplastification by continuous wave of condensation associated with the injection technique showed better periapical conditions than what was seen for the lateral condensation technique (p=0.0055). On the other hand, for the sealers evaluated, the condensation technique resulted in more intense inflammatory reactions when the sealer RealSeal SE was used (p=0.002). In relation to the sealers evaluated, RealSeal SE was seen to be less effective against percolation, thus producing greater levels of chronic inflammation irrespective of the obturation system employed (p=0.0088).
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Lerner, A. "Development of the sea urchin apical organ : cellular mapping of gene expression and FGF signalling." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1406547/.
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The sea urchin apical organ constitutes a fundamental part of the larval nervous system and forms a neuro-sensory structure capable of sensing environmental cues and coordinating swimming behaviour. However, the gene regulatory network (GRN) that underlies the specification of this structure is poorly understood. The first step in building an apical organ GRN, is the high-resolution characterisation of regulatory genes in both time and space. This information then allows the regulatory states of the apical domain to be determined and identifies the existence of different spatial domains. In this study, spatial and temporal expression data of regulatory genes were overlaid onto cellular maps of the apical domain at different developmental stages. These cellular maps were then used to establish the different regulatory states that occur in the apical domain and their dynamics during development. This analysis illustrated that the spatial organisation of the apical domain is far more complex and dynamic than previously thought. The rest of the thesis focuses on functional analysis, and addresses the role of FGF signalling in the development of the apical organ. Embryos injected with a fgfr1 morpholino or incubated with SU5402, a common chemical inhibitor of FGFR1, show an upregulation in a limited group of apical organ genes. Surprisingly, the two methods of disrupting FGFR1 did not affect similar genes, and suggests that an unspecific perturbation is occurring. Functional analysis was also carried out on zic2, an apical organ transcription factor upregulated by SU5402 treatment. The results show that zic2 represses itself and is required for a normal complement of serotonergic neurons.
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Rowan, Lisa S. "Effects of Asphondylia borrichiae, Simulated Herbivory, and Nutritional Status on Survival, Flowering, and Seed Viability in Sea Oxeye Daisy (Borrichia frutescens)." UNF Digital Commons, 2014. http://digitalcommons.unf.edu/etd/500.
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Although herbivory and other types of plant damage typically are viewed as detrimental to plant survival and performance, vigorous regrowth, greater seed set, and fitness benefits may be possible when damage to the apical meristem, or actively growing stem terminal, is involved. Such damage releases apical dominance, or the hormonal suppression of lateral buds, activates dormant lateral buds, and enables lateral shoots to grow. Since in plants with terminal flowers, each stem may bear a flower, removal of the apical meristem may result in stem bifurcation and ultimately increase the number of flowers and seeds, thereby increasing potential fitness. In the current study, possible overcompensation in response to apical meristem damage caused by simulated herbivory (clipping) and the gall midge Asphondylia borrichiae Rossi and Strong (Diptera: Cecidomyiidae) (galling) was investigated in the native coastal halophyte, sea oxeye daisy Borrichia frutescens (L.) DC. (Asteraceae), in relation to nutrient supplementation. Results suggest a strong correlation between stem count and gall count at the study site; moreover, apical dominance was relatively weak early in the growing season and stronger in short plants that were shaded by taller neighbors later in the season. Results also indicate that overcompensation or even full compensation is an unlikely response to apical meristem damage in B. frutescens. Stem count was similar across all stem treatments, but increased significantly with nutrient supplementation, which all supports weak apical dominance in sea oxeye daisy. Nearly all measures of fitness also were either slightly or significantly lower when clipped and galled compared to plants with stems intact, while seed count responded positively to nutrient supplementation.
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Hirschinger, Veronika Verfasser], and Roland [Akademischer Betreuer] [Frankenberger. "Apikale Dichtigkeit zweier Wurzelkanalsealer - Epiphany SE und Tubli Seal EWT - unter Verwendung vier verschiedener Obturationstechniken / Veronika Hirschinger. Betreuer: Roland Frankenberger." Erlangen : Universitätsbibliothek der Universität Erlangen-Nürnberg, 2011. http://d-nb.info/1015782566/34.
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Caccamise, Dana John II. "Geodetic and Oceanographic Aspects of Absolute versus Relative Sea-Level Change." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543357751520828.
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Stewart, Annabelle Greer. "Dibblers on the Jurien islands : the influence of burrowing seabirds and the potential for competition from other species." University of Western Australia. School of Animal Biology, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0066.
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[Truncated abstract] The dibbler, Parantechinus apicalis, is an endangered marsupial that exists on Boullanger, Whitlock and Escape islands off Jurien Bay in Western Australia. The introduced house mouse, Mus domesticus, exists on Boullanger and Whitlock islands, and the King’s skink, Egernia kingii, inhabits Boullanger and Escape islands. The grey-bellied dunnart, Sminthopsis griseoventer, exists on Boullanger Island. Over the last 150 years, the wedge-tailed shearwater, Puffinus pacificus, has colonised the islands to varying degrees. The interaction between dibblers and other island species is not clear. The purpose of this study was to determine the main factors regulating the dynamics of mammals, and in particular dibblers, on the Jurien islands. This was achieved by examining the effect of seabirds, the competitive interactions between species living on the islands, and seasonal changes in the environment. Animals were trapped for a period of 30 months, and their population structure, body condition, longevity, habitat preferences, diet and ecophysiology were examined. The results presented support the theory that by increasing soil nutrient concentrations, burrowing seabirds increase the primary productivity of islands, which has flow on effects to other trophic levels. Densities of seabirds and soil nutrient concentrations were highest on Whitlock Island, intermediate on Escape Island, and lowest on Boullanger Island . . .Thirty-five percent of dibblers on Escape Island were missing their tail or a limb, probably as a result of aggression from King’s skinks. Competition from high numbers of house mice on Boullanger Island, and from high numbers of King’s skinks on Escape Island, may increase the occurrence of male die-off on these islands. The better body condition and greater longevity of dibblers on Whitlock Island, despite high numbers of house mice, suggests that abundant resources are available to sustain both species. This study demonstrates that high densities of seabirds positively affect the population dynamics of mammals on the Jurien islands. Burrowing seabirds appear to influence the dynamics of dibblers more so than competition from house mice or King’s skinks. The findings from this study will assist the Dibbler Recovery Team with future management decisions regarding the viability of dibblers on the Jurien islands, and with decisions regarding the necessity to control house mouse numbers in the presence of native species.
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Gin and 陳錦. "The Effects of Post Space Preparation Timing on Apical Seal of Root Canal Fillings." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/52739667353534749472.
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博士中山醫學大學
口腔醫學研究所
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Endodontically treated teeth usually required intracanal posts in purpose to reinforce the strength of the tooth structure and the retention of the crown. Post space preparation are frequently needed before crown fabrication but it is important not to disrupt the integrity of the remaining filling material that is provided the apical seal. The purpose of this study was to evaluate the effect of different obturation techniques, the types of root canal sealers, the methods and timing of filling material removal during post space preparation had on the apical seal of root canal fillings. A total of 190 extracted single root canal teeth were collected and stored in formalin solution. The teeth were extracted because of severe periodontal problem or orthodontic reason. The apex was completely formed and the apical constriction had not been destructed. All samples were accessed with a #4 round diamond bur through the occlusal surface and working length were measured with a #15 k-file. The tooth was then prepared utilizing rotary NiTi instrument by crown-down preparation technique. All the prepared teeth were stored in the physiological saline and randomized divided into two parts and seven groups. The specimens were then obturated as following: lateral compaction method (30 teeth), vertical compaction method (30 teeth), thermoplasticized warm GP method (30 teeth), and root canal sealers using pulp canal sealer (30 teeth), sealapex EWT(30 teeth), pulp canal sealer EWT(30 teeth). Thereafter, the apical 5.0 of the filling materials was left after the coronal portion were removed with hot plugger within immediate after filling, 3, and 7 days after root canal obturation. Finally, 2.0% methylene blue dye was used to demonstrate the microleakage of the apical seal after the above managements. The results were measured, recorded, and statistically analyzed using SPSS-One WAY ANOVA test. According to the experimental results and statistical analysis, vertical compaction method was superior to lateral compaction method in terms of yielding less dye leakage when heat plugger was to remove root canal filling material. Moreover, the least amount of dye leakage exists when the root canal was filled with vertical compaction using pulp canal sealer EWT. Finally, dye penetration was found more inferior when post space preparation occurs on the 7 days after obturation. In purpose to sustain proper apical seal, it is recommended that post space are better prepared until crown fabrications are ready to be initated. Various techniques, filling materials and ingredients such as AH-plus resin sealer or resilon, a new root canal filling material with methacrylate based, are available for root canal therapy and some esthetic and financial consideration during prosthodontic treatment. Whether or not these differences may affect the outcome of apical seal or post preparation requires further investigation.
Books on the topic "Apical seal"
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Meeting of the Regional Marine Turtle Conservation Programme. Fourth Meeting of the Regional Marine Turtle Conservation Programme held on 4-5 August 1994 in Apia, Western Samoa. South Pacific Regional Environment Programme, 1995.
Find full textBook chapters on the topic "Apical seal"
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VanderZaag, Peter, Tung Xuan Pham, Victoria Escobar Demonteverde, Cynthia Kiswa, Monica Parker, Shadrack Nyawade, Pieter Wauters, and Alex Barekye. "Apical Rooted Cuttings Revolutionize Seed Potato Production by Smallholder Farmers in the Tropics." In Solanum tuberosum - a Promising Crop for Starvation Problem [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98729.
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Potato apical rooted cuttings (ARC) originating from juvenile simple rounded leaf mother plants are a significant new way of transplanting and field growing of seed potatoes under smallholder field conditions in the tropical highlands. The aim of this paper is to highlight the development of the technology by researchers and farmers in Vietnam, Philippines, Kenya and Uganda. The development of cultivars with late blight resistance for which no source of tuber seed was available stimulated the creation of using ARC. The demystification of tissue culture by the 1980s greatly aided this development. The key hurdle was to multiply tissue culture plants in beds of growing media and maintain the physiological young stage of the mother plants from which apical cuttings could be repeatedly taken for several months to produce ARC for sale to farmers who demanded the new cultivars (cvs) with all the desirable attributes. The technology was first developed in warmer climates at lower elevations of less than 1,500 meters above mean sea level (mamsl) but gradually it was successfully developed at cooler climates in East Africa. The technology is well established in the highlands of Vietnam and Philippines. The largest family operation is producing over 4 million ARC annually. These high-quality ARC along with improved cvs have markedly improved yields of smallholder farmers, improving food security and increasing their income levels. In Kenya and Uganda there is a rapid adoption of ARC by seed producers, smallholder farmers and youths. The ARC revolution is bringing a great deal of excitement and promise of prosperity to remote poor highland communities.
Conference papers on the topic "Apical seal"
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Aun, Carlos E., Giulio Gavini, Naya F. Clasen, and Luciana Silva Kfouri. "CO2 laser on apical seal of retrofilled teeth." In BiOS '97, Part of Photonics West, edited by Harvey A. Wigdor, John D. B. Featherstone, and Peter Rechmann. SPIE, 1997. http://dx.doi.org/10.1117/12.273585.
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Joshi, Sagar D., and Lance A. Davidson. "Remote Control of Apical Epithelial Sheet Contraction by Laser Ablation or Nano-Perfusion: Acute Stimulus Triggers Rapid Remodeling of F-Actin Network in Apical Cortex." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-204904.
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Apical contraction is the major tissue movement during remodeling of epithelial sheets in development. During apical contraction, groups of cells narrow their apices to form bottle-shaped structures, driving events such as sea-urchin gastrulation [1], Drosophila ventral-furrow formation, vertebrate neurulation and wound healing [2]. Tissue-folding events such as invagination, ingression and involution involve this tissue movement in which cells actively build “rifts” and “tubes”. Epithelial cells integrate genetic information, mechanical signals, and biochemical gradients to build these structures, but how they do so is unknown [3]. Theoretical models [4] provide some mechanical explanation for these events. Here we experimentally induce apical contractions controllably for the first time in amphibian embryos. Two independent methods, namely, laser ablation of cell membranes and nano-perfusion with cell lysate induce cell contraction in tissue isolates and in whole embryos. We demonstrate a biochemical pathway that stimulates rapid actin-reorganization/ polymerization accompanied by increases in α-actinin. The F-actin remodeling correlates with increased levels of Ca++. Cell contraction begins within few seconds of laser ablation or nano-perfusion, peaks within a minute and is followed by a similar relaxation. Acute control of epithelial mechanics will allow us to better understand how molecular genetic processes drive shape change in tissues and will help future bioengineers build complex 3D epithelial organs.
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Cunha, Alexandre L., Adrienne H. K. Roeder, and Elliot M. Meyerowitz. "Segmenting the sepal and shoot apical meristem of Arabidopsis thaliana." In 2010 32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC 2010). IEEE, 2010. http://dx.doi.org/10.1109/iembs.2010.5626342.
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Zachos, Louis G., and James Sprinkle. "VARIATIONS IN THE APICAL DISC OF A MODERN SEA URCHIN." In 67th Annual Southeastern GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018se-312693.
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Chang, Shyy Woei, Tong-Minn Liou, Shyr Fuu Chiou, and Shuen Fei Chang. "High Rotation Number Heat Transfer of Rotating Trapezoidal Duct With 45-deg Staggered Ribs and Bleeds From Apical Side Wall." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-28174.
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An experimental study of heat transfer in a radially rotating trapezoidal duct with two opposite walls roughened by 45° staggered ribs and mid-rib bleeds from the apical side wall is performed. Centerline heat transfer variations on two rib-roughened surfaces are measured for radially outward flows with and without bleeds at test conditions of Reynolds number (Re), rotation number (Ro) and density ratio (Δρ/ρ) in the ranges of 15000–30000, 0–0.8 and 0.04–0.31, respectively. Geometrical configurations and rotation numbers tested have considerably extended the previous experiences that offer practical applications to the trail edge cooling of a gas turbine rotor blade. A selection of experimental data illustrates the individual and interactive influences of Re, Ro and buoyancy number (Bu) on local heat transfer with and without bleeds. Local heat transfer results are generated with the influences of sidewall bleeds examined to establish heat transfer correlations with Re, Ro and Bu as the controlling flow parameters for design applications.
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Slater, Simon, and Richard Wilkinson. "Investigation Into the Effect of Post Weld Heat Treatment on Thermo-Mechanically Controlled Rolled Pipeline Steels." In 2012 9th International Pipeline Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ipc2012-90738.
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Practical options for routing new or diverted pipelines are often limited, which in some cases can lead to the construction of pipelines in potentially seismic or land-slip areas. Designers have advocated the use of heavy wall pipe in these areas; with the potential requirement for girth weld post weld heat treatment (PWHT) to reduce the residual stresses and temper any hard microstructures created during construction welding. A large proportion of high strength, heavy wall pipe is manufactured using thermo-mechanically controlled processed (TMCP) steel plate. It is generally accepted that these steels are not designed for subsequent PWHT and may suffer some degradation in their mechanical properties when re-heated above critical temperatures. A number of standards, specifications and technical publications acknowledge the influence of PWHT on mechanical properties of TMCP plate, but provide limited guidance on how it will affect the properties. Others refer directly to a detrimental effect, such as BS 4514-1, which states “when PWHT is carried out it may be necessary to verify the properties of the pipe and the welded joints affected by the heat treatment” and EN10208-2 which states “subsequent heating of TMCP material above 580°C may lower the strength”. The response to PWHT of two TMCP pipeline steels used within the UK gas transmission network has been investigated to confirm if the expected degradation in properties occurs and attempt to quantify the scale of any effect. The pipe material tested was L450MB and L555MB (equivalent grade to API5L X65 and X80), with dimensions 1219 mm × 25.4 mm and 1219 mm × 22.9 mm respectively, manufactured using the UOE process and submerged arc welding. The girth welds were manufactured using a manual metal arc process at the National Grid Pipeline Maintenance Centre in the UK. The PWHT parameters were selected to represent the top end of the temperature and time ranges available in existing standards and literature, theoretically testing the worst case scenario in terms of any possible deleterious effect. The project incorporated a detailed test program of the pipe, longitudinal weld and girth weld in both the as-welded and PWHT condition. The paper describes the tests performed and the results obtained. The mechanical properties of both pipe grades met the minimum requirements of the associated specifications after PWHT. However, a general deleterious effect of PWHT was observed, most significantly for the L555MB material and particularly the longitudinal seam weld. The magnitude of any effect is considered a function of the material chemistry, TMCP parameters, welding consumable and PWHT parameters. PWHT on TMCP pipe materials should be restricted. Where PWHT cannot be avoided, testing should be performed on the specific material to clearly define the magnitude of any deterioration in properties at the proposed PWHT temperature and thermal cycle.