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At least 703 records · Page 39Linked to original sources

PubMed1992

[Ultrasonic instrumentation versus hand instrumentation in periodontics. A review of the literature].

The working mechanism and the correct use of ultrasonic devices is discussed. Comparative efficiency of ultrasonic and hand instrumentation is evaluated for the removal of subgingival plaque and calculus, for the effect on root surfaces and for the ability in removing endotoxins. Possible side effects of the ultrasonic vibrations on the tooth structures and periodontal tissues, the incidence of bacteremias and the spreading of oral infections via aerosols are stated. Particular attention is given to the clinical results of both instrumentation technics and the necessity of root planing. One can conclude, that ultrasonics present an alternative and/or a supply for hand instruments, provided that a selective and careful use is taken into account.

Dental Calculus↗

PubMed1975

[Results of A-scan ultrasonic scanning of the orbit (author's transl)].

119 patients who were believed to suffer from orbital tumors were investigated by A-scan ultrasonic studies. 67 turned out to have significant signs of an orbital tumor, 52 were found to be unsuspicious. In all of the 32 surgical procedures, which were additionally performed, the ultrasonic diagnosis could always be verified. Moreover 13 ultrasonic studies led to certain pathological specifications of the tumor and 10 of them could be proved true by histology later on. This paper discuss the advantage of the A-scan ultrasound investigations of the orbit. The efficiency concerning an ultrasonic specification of the tumorous tissue is to be emphasized.

Eye Neoplasms↗

PubMed2002

Effects of debridement with an ultrasonic furcation tip in degree II furcation involvement of mandibular molars.

The purpose of this study was to evaluate the clinical effects of closed debridement with an ultrasonic furcation tip in degree II furcation involvement of mandibular molars. Fifteen patients with degree II furcation involvement in mandibular first and/ or second molars participated in the study. All patients were given oral hygiene instruction. Plaque score, probing depth, probing attachment level and bleeding on probing were recorded at baseline, 1, 4, 8 and 12 weeks. Following a baseline examination, a single episode of supra- and subgingival debridement was provided using an ultrasonic furcation tip in the test group, and an ultrasonic conventional tip and hand scalers under local anesthesia in the control group. At baseline, the mean horizontal probing depth in the test group was 6.35 mm and in the control group 6.06 mm. These values decreased to 4.88 mm and 5.29 mm respectively after 12 weeks. There were horizontal probing attachment gains of 1.29 mm in the test group and 0.59 mm in the control group after 12 weeks (P < 0.01). The bleeding scores were 1.0 in the test group and 0.88 in control group at baseline. These scores were improved to 0.12 in the test group and 0.59 in the control group after 12 weeks (P < 0.01). The results suggest that ultrasonic debridement with a furcation tip has a significantly better potential in treating degree II furcation involvement of mandibular molars.

Adult↗

PubMed2002

The effect of tetracycline hydrochloride on the attachment of gingival fibroblasts. A scanning electron microscopic study on the effect of ultrasonic scaling before root conditioning.

Twenty four human teeth, extracted due to severe periodontitis were used in the present Following extraction, the border between healthy and diseased was marked with a small dental bur. The portions of diseased roots were either untreated or were treated with ultrasonic scaling or tetracycline hydrochloride, or ultrasonic scaling followed by tetracycline hydrochloride. Human gingival fibroblasts were then added to the roots so treated and were allowed to incubate for 72 h and examined by scanning electron microscopy. There were a significantly greater number of fibroblasts attached to specimens treated with ultrasonic scaling and ultrasonic scaling followed by root demineralization. No cells were could be seen on the untreated surfaces whether or not root surface conditioning was used.

Anti-Bacterial Agents↗

PubMedDate not supplied

Comparison of two ultrasonic cleaning units for deterioration of cutting edges and debris removal on dental burs.

The effects of two ultrasonic cleaning units on surface deterioration and cleaning effectiveness of dental burs were compared in this study. The units tested were the Dextrex Model L 503B (Dextrex Chemical Industries, Inc., Bowling Green, KY) industrial ultrasonic unit and a conventional dental ultrasonic unit L & R T-21 B (L & R Manufacturing Co., Kearny, NJ). SEM photomicrographs of the burs were made before cleaning; and burs were processed for 10 min in each unit. Forty-eight new burs (24 #1/2A diamond and 24 #330 carbide) contaminated with human blood and 48 burs contaminated with tooth debris following cavity preparation were used to evaluate cleanliness. To assess deterioration, 48 new burs were evaluated for changes in the number of diamond chips or pits (carbide burs) and color changes following ultrasonic cleaning. Neither unit sufficiently cleaned the burs, as evidenced by remnants of remaining blood and debris on the burs. The loss of diamond chips was statistically significant for the burs processed in the Dextrex unit (P < 0.001) as well as for burs processed in the L & RT 21-B unit (P < 0.01). The mean number of pits was significant in carbide burs processed in both units as well (Dextrex unit: P < 0.01; L & RT-21 B unit: P < 0.001). No differences were noted in color changes for any of the burs in either unit. These data showed that the industrial-type unit was no more effective in cleaning dental burs than the conventional unit, though both units caused significant amounts of deterioration in the cutting surfaces.

Carbon↗

PubMed1992

[The bactericidal efficiency of ultrasonic in the root canal].

The objective of this paper was to determine the quantitative bactericidal efficiency of ultrasonic in the root canal. Four test organisms found frequently in the root canal were compared. The result showed ultrasonic can kill the test organisms effectively in the root canals. The best bactericidal efficiency occurred at 4 or 5 min. of ultrasonic though the more efficiency as the time longer. Bactericidal irrigation could increase the bactericidal efficiency of ultrasonic and its bactericidal action similar to irrigation bactericidal property.

Actinomyces↗

PubMedDate not supplied

Efficacy of ultrasonic tissue dissector and tissue glue for laparoscopic partial nephrectomy in a porcine model.

The purpose of this study was to evaluate the efficacy and long-term tissue effects of ultrasonic dissector and cyanoacrylate glue during laparoscopic partial nephrectomy in a porcine model. Nine domestic pigs underwent laparoscopic left lower pole partial nephrectomy without vascular control. An ultrasonic tissue dissector was used to assist in the parenchymal incision, and the raw surfaces of the kidneys, including the exposed urinary system, were sealed with cyanoacrylate glue. No internal stents or additional sutures were placed. Intraoperative hemorrhages and urinary extravasation were recorded. The animals were humanely killed 28 days after undergoing the operations. The long-term effects of ultrasonic dissector and cyanoacrylate glue on the healing process of urothelium and renal parenchyma were determined histologically. All pigs survived the laparoscopic partial nephrectomy, and the blood loss ranged from 0 to 120 ml (mean, 60 ml). The average operative time was 89 +/- 10 min. The severity of the bleeding was minimal in six animals and moderate in three animals. No urinary extravasation was found using intravenous urography at the 28th postoperative day. No urinary fistula or renal abscess formation was found histologically. Cyanoacrylate glue infiltrated into the tissue defects and did not dissolve. The glue was encased by fibrotic tissue with minimal foreign body inflammatory reaction. Ultrasonic dissector was effective in achieving hemostasis during laparoscopic partial nephrectomy without the need of vascular control in pigs. Cyanoacrylate glue achieved good long-term adhesive power. The sealing effects provided by cyanoacrylate glue were adequate to prevent urinary extravasation from urothelial defects at least for 1 month.

Animals↗

PubMedDate not supplied

The function profile of compressed-air and ultrasonic nebulizers.

In order to study the detailed function of two kinds of nebulizers commonly used in clinical asthma treatment, compressed-air and ultrasonic, this study was conducted. At the beginning, various flow rates were adjusted, paired with different volumes of solutions in the container. The changes of temperature, pH, and osmolality during the course of nebulization were examined. Normal saline, terbutaline, and fenoterol solutions were used as the nebulized solutions. The study was performed in an environment in ambient temperature around 20 degrees C and relative humidity around 70%. The results showed a minimal 6 L/min flow rate was required to nebulize the solution when using the compressed-air nebulizer. The dead volume was about 0.8 ml for compressed-air and 8.5 ml for the ultrasonic nebulizer. When using the compressed-air nebulizer, the temperature, both in the solution and at the mouthpiece site, dropped gradually. On the contrary, the temperatures at both sites increased a little bit when using the ultrasonic nebulizer. The pH values of pure terbutaline and fenoterol nebulized solutions were acidic (3.58 and 3.00 respectively). The osmolality of terbutaline and fenoterol nebulized solutions were isotonic. The osmolality increased gradually during the course of nebulization, to a greater extent in the compressed-air nebulizer. In conclusion, both types of nebulizers have their special features. The ultrasonic nebulizer displays less extent in change of temperature and osmolality during nebulization and is expected to be a better device in treating asthmatic patients in terms of lesser effect on cooling and changing the osmolality of airway mucosa.

Air↗

PubMed2004

Influence of passive ultrasonic activation on the penetration depth of different sealers.

Correct use of instruments and irrigating solutions are major factors during chemo-mechanical preparation of root canals. Ultrasonically activated files and solutions are used for debridement of canals. In this study 42 single rooted anterior human teeth were used. The roots were divided into two groups. One group received an application of 17% ethylenediamine tetra acetic acid (EDTA) of 1 ml for 1 min using an ultrasonically energized file. The other group received an application of 17% EDTA of 1 ml for 0.5 min using an ultrasonically energized file. The groups were divided again into two subgroups. The roots were filled with a resin based sealer, AH26 and a glass ionomer sealer--Endion with lateral condensation technique. The roots were separated into two halves. The specimens were viewed through a scanning electron microscope (SEM). Statistical differences between the groups and regions were analyzed with Variance and Duncan tests. Under the conditions of this study, it can be said that ultrasonically activated irrigation did not reduce the smear layer effectively at 1 min and 0.5 min time intervals. According to this result, no difference was observed between the penetration of sealers.

Analysis of Variance↗

PubMedDate not supplied

[Milligan-Morgan haemorrhoidectomy with ultrasonic scalpel].

INTRODUCTION: Milligan-Morgan haemorrhoidectomy is considered the best treatment for hemorrhoidal disease. Although this, many patients complaint post-operative pain that remain the worse complication. For this reason different are the trials performed in order to reduce his intensity. In this report we want to evaluate if the use of ultrasonic scalpel to perform Milligan-Morgan hemorrhoidectomy, compared with conventional surgery, could reduce post-operative pain. MATERIALS AND METHODS: 30 patients with III and IV degree of haemorrhoids were included in this study and divided in two groups. In the first group Milligan-Morgan haemorrhoidectomy was performed with conventional instruments, while in the second group the some procedure was performed with ultrasonic scalpel. The duration of intervention, time hospitalization, the time to open alvus to stools, the time to return to normal activity, the complications, pain and the amount of analgesic consumption were evaluated. RESULTS: In the II group's patients, it was observed a reduced time to healing with reduced spread of necrosis and inflammatory pattern, associated with reduced post-operative pain and the lower analgesic consumption. CONCLUSIONS: The use of ultrasonic scalpel to perform Milligan-Morgan haemorrhoidectomy, compared with conventional instruments, reduce post-operative pain making a more short time to healing and a precocious time to return to normal activity. For this reason we believe that the use of ultrasonic scalpel, although a more elevated costs, seems to be advantageous.

Adult↗

PubMedDate not supplied

Improved histopathological evaluation of gliomas using tissue fragments obtained by ultrasonic aspiration.

Ultrasonic aspirators are commonly used to resect brain tumors because they allow safe, rapid and accurate removal of dissected tissue. However, the tissue fragments removed by ultrasonic aspirators are used surprisingly little in daily diagnostics and in clinical research. A comparison between diagnoses made on the tissue fragments removed by the Sonocut ultrasonic aspirator and the tissue in conventional tumor biopsies was made. The correspondence between the amount of Sonocut tissue analyzed and the probability of making the most malignant diagnosis was analyzed statistically in order to limit the amount of tissue fragments, which need to be analyzed, and in order to save tissue for other purposes like molecular genetics and in vitro drug sensitivity assays. Thirty cases were included in the present study and consisted of astrocytomas, glioblastomas, oligodendrogliomas and ependymomas. The results showed that in 8 out of 30 cases only the Sonocut tissue fragments contained the tumor components that provided the most malignant diagnosis. In further 20 cases, the Sonocut tissue fragments and conventional tumor biopsies gave the same diagnoses. In the remaining 2 cases, the most malignant foci were included in the biopsy removed for peroperative frozen section investigation. When the slides with Sonocut tissue fragments were analyzed, the probability of making the most malignant diagnosis increased from 81.3% - 99.1%, when slides from 1 - 5 paraffin blocks were analyzed, respectively. When subgroups of small, medium and big tumors were analyzed, it was found that only 2 paraffin blocks from small tumors need to be prepared to reach 98.3% probability of making the most malignant diagnosis, whereas 5 paraffin blocks from big tumors need to be prepared to reach a 96.8% probability. In conclusion, the study shows that a limited amount of Sonocut ultrasonic tissue fragments improve the diagnostic evaluation of gliomas. These tissue fragments therefore must not be discarded. Only few paraffin blocks need to be prepared to reach close to 100% probability of making the most malignant diagnosis, reducing the amount of slides, which have to be analyzed and saving Sonocut tissue fragments for future use in molecular genetics and drug sensitivity assays.

Astrocytoma↗

PubMed2002

[Optimizing the ultrasonic extraction of tannin in Elaeagnus angustifolia L. by uniform design].

The influences of ultrasonic frequency and ultrasonic time on the extraction rate of Tannin in Elaeagnus angustifolia L. were studied. The optimizing had been got. Results showed that the ultrasonic extraction method of Tannin in Elaeagnus angustifolia L. could save time, improve extraction rates, and need not be hot. Compared with traditional extraction, the ultrasonic extraction method is a good way.

Drugs, Chinese Herbal↗

PubMed2004

[Study on ultrasonic extraction techniques of flavonoids in Chrysanthemum morifolium].

OBJECTIVE: To optimize the ultrasonic extraction condition for flavonoids from Chrysanthemum morifolium. METHOD: The extraction rate of flavonoids optimized condition (ethanol concentration, ultrasonic time, solvent quantity and extraction times) was determined by orthogonal design. UV-Spectrophotometry was used for the determination. RESULT: The order of factors to affect the flavonoid extraction was ethanol concentration > extraction times > solvent quantity > ultrasonic time. CONCLUSION: The optimum ultrasonic extractions were: A2 B2 C3 D3. Compared with traditional extraction, ultraction method can save time, be easy to operate, improve extraction rates and need no heating.

Chrysanthemum↗

PubMed2005

Effect of ultrasonic scaling on salivary lactate dehydrogenase.

PURPOSE: To determine Lactate Dehydrogenase Activity (LDHA) in whole saliva in individuals with periodontal disease and the effect of ultrasonic scaling on this enzyme activity. METHODS: A study group of 50 patients with PD (Community Periodontal Index of Treatment Needs > or = 3) was selected at random. Half of the patients (n=25) received ultrasonic periodontal treatment (Group 1). In the other 25 patients with PD the ultrasonic scaling was not performed (Group 2). A control group was selected (Group 3) consisting of 25 adults without PD (Community Periodontal Index of Treatment Needs = 0), with age and gender distribution similar to the study group. LDHA determinations were carried out with a Cobas Mira Plus II autoanalyzer pursuant to the recommendations of the French Society of Clinical Biology. A baseline determination of LDHA was carried out on all the participants and a second determination was performed 3 months later. RESULTS: Baseline determination of LDHA was higher in patients with PD than in the control group. These differences were statistically significant (P< 0.001). LDHA was significantly reduced in patients with PD after ultrasonic scaling with respect to baseline determination (P< 0.0001). LDHA differences between Groups 2 and 3 were statistically significant (P< 0.0001), but it was not so between Groups 1 and 3.

Adult↗

PubMedDate not supplied

Sealing the thoracic duct with ultrasonic coagulating shears.

BACKGROUND/AIMS: Ultrasonic coagulating shears were developed as an endosurgical device that allows cutting of vessels without ligation. In this study, we obtained basic data on the feasibility of dividing and sealing the thoracic duct by using ultrasonic coagulating shears. METHODOLOGY: We obtained the thoracic duct and the left gastric artery from surgical specimens of 27 patients. After one end of each vessel was sealed using ultrasonic coagulating shears, we recorded the bursting pressure. The sealed ends of the vessels were also examined histopathologically. RESULTS: The mean bursting pressure of the thoracic duct was high enough to support the clinical use of this device, and was significantly higher than that of the left gastric artery (p<0.001). Microscopic examination of the sealed vessels showed that degenerated collagen fibers were more homogeneous and covered a significantly larger area in the thoracic duct than in the left gastric artery (p<0.001). CONCLUSIONS: The present study provides a basis for using ultrasonic coagulating shears to seal the thoracic duct and possibly lymph node dissection.

Electrocoagulation↗

PubMed2006

Proliferative response of gingival cells to ultrasonic and/or vibration toothbrushes.

PURPOSE: To evaluate the effects of ultrasonic and/or vibration toothbrushes on cell proliferation and collagen synthesis. METHODS: In eight dogs, teeth and gingivae were stimulated once a day as follows: the first quadrant with an ultrasonic toothbrush (1.6 MHz); the second one with a mechanical vibratory toothbrush (141 Hz); and the third one with a toothbrush generating both the ultrasound and the vibration. The fourth quadrant served as a control. Proliferative activity and collagen synthesis of gingival cells were evaluated by assaying the expression of proliferating cell nuclear antigen (PCNA) and procollagen type I C-peptide (PIP), respectively. RESULTS: After 5 weeks, ultrasonic or vibratory toothbrushes increased the numbers of PCNA-positive fibroblasts and PIP-positive fibroblasts. Toothbrushing with a combination of ultrasound and mechanical vibration increased the numbers of PIP-positive fibroblasts, total fibroblasts and vascular endothelial cells to a greater extent than the one with only ultrasound alone. Vibratory toothbrush, but not the ultrasonic one, induced an increase in collagen density without gingival overgrowth.

Animals↗

PubMed2006

[Ultrasonic atomization of Shaduolika and dexamethasone for pain relief in patients with foliate papillitis].

PURPOSE: To evaluate the effect of ultrasonic atomization of Shaduolika (a traditional Chinese herb), dexamethasone for pain relief in patients with foliate papillitis. METHODS: 84 patients with foliate papillitis were divided into two groups randomly with the single-blind method. Patients in the experimental group were treated with ultrasonic atomization of Shaduolika and dexamethasone, while patients in the control group were treated by taking Niuhuangjiedu tablets (mixed traditional Chinese medicine). All the patients were observed for five days. Pain relief degree by VAS and the response to the interventions between the experimental and the control group were recorded and compared. The data was analyzed with Ridit test, Chi-square test and Student's t test using SAS6.12 software package, respectively. RESULTS: Pain scores between the experimental and the control group prior to treatment had no significant difference (U=0.1859<1.96, P>0.05), while significant difference existed in pain relief after treatment (U=5.773, P<0.01). The effect of ultrasonic atomization of Shaduolika and dexamethasone for pain relief was significantly better than the control group (U=5.233,P<0.01). CONCLUSIONS: For patients with foliate papillitis, ultrasonic atomization of Shaduolika and dexamethasone is a safe and effective method.

Anti-Inflammatory Agents↗

PubMed2006

[Clinical evaluation of electronic dental analgesia during ultrasonic scaling].

OBJECTIVE: To evaluate the effect of electronic dental analgesia (EDA) device--Team Up Duo during ultrasonic scaling. METHODS: The clinical trial was conducted as a randomized double-blind split-mouth design. Eighty-one patients requiring ultrasonic scaling were selected as subjects. Patients received treatment using the EDA device either in an active or an inactive state in paired quadrants. The patients scored their pain/discomfort levels with visual analog scale (VAS) after each procedure and filled a questionnaire. RESULTS: In questionnaire, 79.0% patients felt EDA could relieve pain/discomfort during ultrasonic scaling. But the double-blind test showed that Team Up Duo was effective in 46.9% patients overall. The effective rate was 55.1% and 34.4% in groups with or without attachment loss, respectively. In CP group, the success rate of EDA was not statistically significantly different between the groups according to sex, age or site. CONCLUSIONS: When using Team Up Duo during ultrasonic scaling, most patients subjectively believed that it was effective for controlling pain. In fact, this EDA device was effective in partial patients.

Adolescent↗