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Implant-tooth fixed supported prosthesis: A review
Published in J. Belinha, R.M. Natal Jorge, J.C. Reis Campos, Mário A.P. Vaz, João Manuel, R.S. Tavares, Biodental Engineering V, 2019
R. Batista, A. Moreira, M. Sampaio-Fernandes, P. Vaz, J.C. Reis Campos, M.H. Figueiral
Intrusion of the tooth is a common and unfavourable consequence that is well described in literature. This type of displacement is usually seen when non-rigid connectors or coping and telescopes with provisional cement or with no cement are used (Naert et al. 2001, Lindh et al. 2001, Garcia et al. 1998, Singer 1993). To avoid this phenomenon it has been observed that a rigid connection is more favourable than a connection with a disposer (or non-rigid) because it is able to attenuate the intrusion of the natural tooth. Furthermore, a pontic design short and straight as possible will prevent lateral displacement of the natural abutment (Naert IE. 2001). In cases where tooth-implant connection are required, it is necessary to follow-up the intrusion of the tooth abutment, since implants exhibit different displacement characteristics in response to loading when compared with natural teeth (Koyano et al. 2015). A study by Pesun and colleagues where TISP were placed in 30 mixed-breed dogs concluded that the vasculature and morphology of the histologic samples indicated stability and lack of inflammatory reaction from the periodontal ligament of the abutment tooth, but also lack of intrusion when using a rigid connector (Pesun et al. 1999).
Effect of electrical stimulation on bone healing
Published in Ze Zhang, Mahmoud Rouabhia, Simon E. Moulton, Conductive Polymers, 2018
Michelle Griffin, Ardeshir Bayat
Enhancement of bone formation and bone healing has been demonstrated in vivo using PEMF. Several osteotomy in vivo models have proved there is a stimulatory effect of PEMF on bone healing (Inoue et al. 2002; Sarker et al. 1993). Mixed-breed dogs were treated with PEMF for 1 h daily for 4 weeks after surgery for 8 weeks (Inoue et al. 2002). In the PEMF group, load bearing was earlier and, at 8 weeks, was greater than in the control group. Using a similar model, it has also been illustrated that PEMF enhanced the bone formation and fracture healing of the osteotomy sites after 9 h per day in an animal rat model. The authors concluded that fractured rat tibia could be enhanced by the application of PEMF, which was clearly observed in the third week (Sarker et al. 1993).
Organic Chemicals
Published in William J. Rea, Kalpana D. Patel, Reversibility of Chronic Disease and Hypersensitivity, Volume 4, 2017
William J. Rea, Kalpana D. Patel
Air pollution may be associated with CNS inflammation and disrupted neural transmission,363,364 which one sees in the chemically sensitive as evidenced by the Triple-Camera Brain SPECT scan correlating with clinical signs of confusion and inability to walk a straight line or stand on their toes with eyes open or closed or have concentrated brain function. According to Kraft and Harry, exposure to diesel exhaust, which makes up a significant portion of the air pollution present in a number of the Mexican cities from which animal and human cohorts have been examined, is associated with gliosis and brain damage in rats, dogs, and humans.365,366 In an earlier study, Calderon-Garciduenas et al.11 examined cortical brain tissue of feral dogs of mixed breed, from less than 1 year to 12 years of age, with uncontrolled diet and genetic background, living in a highly polluted region (Southwest Metropolitan Mexico City, SWMMC), as compared with dogs from a less polluted region (Tlaxcala, Mexico). From these random cohorts, the authors interpreted the data of elevated NF-κB activation, iNOS levels, and astrogliosis to 1 PM in the brain.
Efficacy of soap and water based skin decontamination using in vivo animal models: a systematic review
Published in Journal of Toxicology and Environmental Health, Part B, 2021
Anuk Burli, Nadia Kashetsky, Aileen Feschuk, Rebecca M. Law, Howard I. Maibach
Pullin et al. (1978) decontaminated phenol from skin of mixed breed swine (n = 4), applied to 35–40% body surface area (dose: 500 mg/kg). After 1 min, decontamination for 15 min using a plain-water shower (volume flow rate: 100 L/min, temperature: room temperature) was completed in n = 4 swine. Three swine were designated controls and did not receive decontamination. Decontamination was analyzed by concentration of blood plasma phenol measured using gas chromatography. Dermal and systemic effects, including tremors, twitching, dilated pupils, salivation, nasal discharge, dyspnea, convulsions, coma, cyanosis, number of deaths/number of animals, dermal necrosis, and recovery time were also recorded. Immediately after decontamination all animals (n = 4) showed immediate signs of toxicity, including muscular twitching and tremors. At two to three hrs after exposure, animals began to recover, and at 24 hr were functioning normally. No skin discoloration was noted, and dermal necrosis was slight to moderate. No animals in the water decontamination group had died, whereas two out of three of the control animals did. The peak phenol plasma concentration was 24.2 ppm at 15 min post exposure. However, the mean plasma phenol concentration in the decontamination group was significantly lower than the control. The control group hit a peak plasma phenol concentration of approximately 55 ppm at approximately two hr post exposure. Pullin et al. (1978) concluded that decontamination was incomplete as phenol was absorbed rapidly.