• The Journal of the Korea Contents Association
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• v.22 no.9
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• pp.583-591
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• 2022

The purpose of this study was to determine the incidence of dental erosion according to the type of lactic acid bacteria fermented oil and to identify a method for preventing dental erosion. For the lactic acid bacteria fermented milk, liquid fermented milk, condense-stirred type fermented milk, and condense-drink type fermented milk were used, and bovine tooth specimens used in the experiment were used. As a method to prevent dental erosion, the method of adding calcium to the lactic acid bacteria fermented milk, the method of applying high and low concentrations of fluoride to the teeth before exposure to the lactic acid bacteria fermented milk, and the method of applying these two methods together were measured to measure the preventive effect of dental erosion. As a result of immersing the specimen in the experimental beverage, the surface hardness of liquid fermented milk decreased the most. When comparing the difference in surface hardness before and after prophylaxis care, the Ca 2% group and the NaF 0.05%+Ca 0.5% group showed no significant difference from the negative control group, confirming that it is an effective method for preventing dental erosion. However, considering the change in taste and the stability of ingredients, a method of adding calcium at a low concentration rather than adding a high concentration of calcium is proposed. Therefore, it is recommended to use low-concentration calcium and low-concentration fluoride together to recognize the possibility of dental erosion when ingesting lactic acid bacteria and to prevent dental erosion caused by it.

• 월간산업보건
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• s.338
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• pp.12-17
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• 2016

• Journal of Dental Rehabilitation and Applied Science
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• v.33 no.1
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• pp.42-46
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• 2017

Dental erosion is defined as tooth structure loss by acidic chemical substance. It is caused by extrinsic factors such as acidic foods, drugs, and working environments, and also intrinsic factors such as gastric acid regurgitation in gastro-esophageal disorder or intensive vomiting in bulimia nervosa. These lesions can be treated with direct resin filling, laminate or full contour crown depending on the intensity of clinical problem. This is a case report about treatment of rare clinical case: labial erosion of anterior tooth caused by frequent intake of acidic fruit and palatal erosion of anterior tooth caused by intensive vomiting in bulimia nervosa.

• Journal of Korean society of Dental Hygiene
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• v.21 no.5
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• pp.507-515
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• 2021

Objectives: The aim of this study was to evaluate the extent of the potential erosion of enamel induced by three different types of commercial fermented milk using the pH cycle model. Methods: Specimens were treated and soaked up in three types of fermented milk and in mineral water for 10 min, four times a day for 8 days, and all of the specimens were immersed in artificial saliva outside of treatment times. The microhardness of the surface was measured by a microhardness tester, and a scanning electron microscope (SEM) was used to identify the enamel surface morphology. Results: The differences in the surface microhardness (ΔVHN) of enamel were different among the groups (p<0.05). The four groups were in descending order of ΔVHN: the liquid type group, condensed-drink type group, condensed-stirred type group, and control group. The liquid type group had a higher ΔVHN than the other two fermented milk groups (p<0.05). Based on SEM observation, the most severe surface damage was due to the liquid type of fermented milk. Conclusions: Customers' careful discretion is advised when purchasing these types of fermented milk. This information is anticipated to be of much value in the prevention of dental erosion.

• Journal of the korean academy of Pediatric Dentistry
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• v.38 no.1
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• pp.56-61
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• 2011

Cornelia de Lange syndrome(CdLS) is a well-described multiple malformation syndrome typically involving proportionate small stature, developmental delay, specific facial features, major malformations, and behavioral abnormalities. Dental issues include micrognathia, crowding of teeth, small teeth, absent teeth, poor oral hygiene, and periodontal disease. We present a case of CdLS in a 10-year-old girl. Micrognathia, crowding of teeth, and bifid uvula are the characteristic features of this case. Dental treatments for this child including preventive and restorative procedures were performed under outpatient general anesthesia.

• Restorative Dentistry and Endodontics
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• v.33 no.2
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• pp.141-147
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• 2008

This study was aimed to develop an instrument for real-time measurement of fluid conductance and to investigate the hydrodynamics of dentinal fluid. The instrument consisted of three parts; (1) a glass capillary and a photo sensor for detection of fluid movement, (2) a servo-motor, a lead screw and a ball nut for tracking of fluid movement, (3) a rotary encoder and software for data processing. To observe the blocking effect of dentinal fluid movement, oxalate gel and self-etch adhesive agent were used. BisBlock (Bisco) and Clearfil SE Bond (Kuraray) were applied to the occlusal dentin surface of extracted human teeth. Using this new device, the fluid movement was measured and compared between before and after each agent was applied. The instrument was able to measure dentinal fluid movement with a high resolution (0.196 nL) and the flow occurred with a rate of 0.84 to 15.2 nL/s before treatment. After BisBlock or Clearfil SE Bond was used, the fluid movement was decreased by 39.8 to 89.6%.

• Journal of Korean society of Dental Hygiene
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• v.17 no.4
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• pp.657-667
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• 2017

Objectives: The aim of this study was to evaluate the potential of dental erosion by three different types of commercial fermented milk on the enamel surface of bovine teeth. Methods: Forty bovine teeth (four groups of 10) were immersed in fermented milk (experimental groups: liquid type, condense-stirred type and condense-drink type) or mineral water (control group) for 1, 3, 5, 10, 15, 30, 60, 90 and 120 minutes. Enamel surface microhardness was measured before and after treatment with a microhardness tester, and Scanning Electron Microscope (SEM) was used to assess the enamel surface morphology. Results:Changes in enamel surface microhardness (before-after treatment; ${\Delta}VHN$) were significantly different among the four groups (p<0.05). ${\Delta}VHN$ was highest in the liquid type group, followed by the condense-stirred type, condense-drink type, and control groups. The ${\Delta}VHNs$ of three types of fermented milk groups were higher than that of the control group (p<0.05). The liquid type group showed higher ${\Delta}VHN$ than the other two types of condense fermented milk groups (p<0.05). However, there was no significant difference in ${\Delta}VHN$ between the two types of condense fermented milk (p>0.05). The results of SEM observation have shown the most severe surface damage in bovine teeth immersed in the liquid type of fermented milk. Conclusions: In this study, it appears that liquid type fermented milk causes greater development of dental erosion. The physical properties and pH of fermented milk types must be considered for prevention of dental erosion associated with ingestion of fermented milk.

• Journal of Korean society of Dental Hygiene
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• v.17 no.6
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• pp.969-981
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• 2017

Objectives: The present study aimed to evaluate the preventive effects of exposure to liquid fermented milk containing various concentrations of added calcium on dental erosion, and to investigate the optimal concentration of calcium effective in reducing dental erosion. Methods: The present study consisted of a total of 6 experimental groups: a mineral water group, a fermented milk with no added calcium (0%) group, and four fermented milk with various concentrations of added calcium (0.1%, 0.5%, 1%, and 2%) groups. Twelve specimens were immersed for 1, 3, 5 and 10 minutes in each experimental drink and the change in surface microhardness was measured. Additionally, the surface was observed using a scanning electron microscope. Results: The difference in surface microhardness before and after 10 minutes of immersion in the experimental drink was the highest in the Ca 0% group, followed by the Ca 0.1%, 0.5%, 1%, 2% group and the mineral water group, in that order. The groups with a calcium concentration of more than 0.5% showed statistically significant differences in surface microhardness compared to the Ca 0% group. In addition, when the surface morphology of enamel was observed under a scanning electron microscope, the results showed that the highest level of surface damage was observed in the Ca 0% group, followed by the Ca 0.1%, 0.5%, 1%, 2% group, in that order. Conclusions:The present study confirms that a higher calcium concentration in fermented milk is associated with a higher possibility of preventing dental erosion. The addition of 0.5% calcium, which is a relatively low concentration, did not completely prevent dental erosion, but significantly inhibited dental erosion compared to fermented milk without any added calcium. Therefore, it is suggested that consumers should be educated and provided with guidance to consider the calcium content when choosing fermented milk.

• Journal of the korean academy of Pediatric Dentistry
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• v.29 no.2
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• pp.210-216
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• 2002

Air abrasion technology can prepare enamel and dentin for bonding, similar to etching by acidic gels and solutions. Longer treatment can excavate pit and fissures, preparing the tooth for immediate placement of bonded resin materials. Although not appropriate for every clinical situation, the air abrasive technology minimizes heat, vibration and bone-conducted noise associated with conventional means of caries removal since the cutting is accomplished by air pressure. Also, patients treated with the air-abrasion technology rarely request anesthesia. Air abrasion technology was more effective in treating early carious lesions and stains compared to lesions where caries had already progressed to produce soft dentin and the strong air stream and noise caused by the evacuation system was a major discomfort to pediatric patients, and the experience and skillfulness of clinician should be required for accurate and proper tooth preparation.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1983.05a
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• pp.13.1-13
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• 1983

Sudden esophageal obstruction by a bolus of food is not a rare phenomenon. The individual is frequently elderly and has ill-fitting dentures through others may initiate this by bolting food. In adult patient there is a frequent history of alcoholic intake, the consumption of meat with improper chewing. A common anatomic abnormality leading to meat impaction of the esophagus is hiatal hernia, which is often associated with a ring or stricture. Recently authors experienced a case of repeated esophageal foreign bodies in 10 days in the patient who had esophageal stricture.