• Title/Summary/Keyword: Impaction

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A CLINICAL STUDY ON THE OCCURRENCE OF FOOD IMPACTION (식편압입의 발현에 관한 임상적 연구)

  • Jung, Jae-Hoon;Oh, Sang-Chun;Dong, Jin-Keun
    • The Journal of Korean Academy of Prosthodontics
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    • v.38 no.1
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    • pp.50-58
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    • 2000
  • The purpose of this study was to investigate the causes of food impaction and to explore solutions as well. For this study, 39 patients with food impaction were selected. 77 contact areas in these patients were investigated mobility, tightness of contact area, gingival index, plaque index, attachment loss, alveolar bone loss, proximal caries, marginal ridge distance and occlusal relationships. The results were as follows ; 1. Teeth without distal support were found to be the most frequent site of food impaction (41.6%). Food impaction was found to be more frequent in the upper teeth (65.2%) than the lower teeth (33.8%). 2. Food impaction was found in tight contact cases (71.4%). Alveolar bone loss was not found in the early stage of food impaction (83.1%) 3. The distance between the marginal ridges of food impaction sites (mean=0.48mm) was short-er than that of the control group. (mean=0.77mm) (p<0.001) 4. In 18.2% of the cases, proximal carries were found at the food impaction site. 5. Food impaction affected patient's occlusion with the following frequencies, cusp to marginal ridge relationship (72.7%), cusp to fossa relationship (3.9%) and stepped relationship (23.4%).

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Maxillay canine impaction: Early diagnosis & Preventive approaches (임상가를 위한 특집 1 - 상악 매복 견치의 진단과 예방적 접근)

  • Park, Kitae
    • The Journal of the Korean dental association
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    • v.52 no.5
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    • pp.264-272
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    • 2014
  • Maxillary canine is the most common impacted tooth except third molars. In Asian populations, labial impaction is more common than palatal impaction, but palatal impaction is three times more common than labial impaction in Caucasion. The incidence of maxillary canine impaction is known as 1~3%, and 12% of these cases are involved in the root resorption of the adjacent lateral incisor. In children, early diagnosis is important to prevent the impaction of maxillary canine through clinical and radiographic examinations. In addition, preventive measures should be considered at the proper time. These measures include the removal of deciduous canines and the expansion of the maxillary arch.

Spray Characteristics Depending Upon Impaction Land Surface Angle Variations (충돌면 경사각도 변화에 따른 분무특성)

  • Kim, C.H.;Kim, J.H.;Park, K.H.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.6
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    • pp.63-71
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    • 1998
  • In a diesel engine the phenomenon of spray impaction on a combustion chamber wall has been taken as an undesirable matter because of the deposition of fuel on the surfaces, and the subsequent slow evaporation and mixing with air resulting in unburned hydrocarbons. Therefore many researches have concentrated on avoiding fuel impaction on surfaces. On the contrary done a number of studies using spray wall impactions in a positive way, which makes the droplets smaller, changes the direction into free spaces far from the wall and also improves mixing with air. In this paper the angle variations of the impaction land sufrace prepared for the injection spray is analysed as a simulative manner. The spray dispersions, vapor distributions and flow fields are compared with impacting angle variation. The results show more angle give more vapor distribution until $15^{\circ}$.

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Study about the relationship between the amount of posterior impaction and the change of occlusal plane angle and incisor inclination in Le Fort I osteotomy (Le Fort I 골절단술에서 posterior impaction의 양과 occlusal plane angle, incisor inclination의 변화 관계에 관한 연구)

  • Kim, Bok-Joo;Kim, Min-Gu;Kim, Jung-Han;Kim, Chul-Hoon
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.36 no.5
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    • pp.375-379
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    • 2010
  • Introduction: In the management of dentofacial deformities, variable movement of the maxilla can be made possible by a Le Fort I osteotomy. Posterior impaction of the maxilla necessary for rotation of the maxillomandibular complex enhances the functions and esthetic results. In cases of posterior impaction of the maxilla, an increase in the figure of the occlusal plane angle and incisor inclination can occur. This study reports the relationship between the amount of posterior impaction and the change in the occlusal plane angle and incisor inclination in a Le Fort I osteotomy by preoperative and postoperative lateral cephalograms. Materials and Methods: Twenty patients who had undergone orthognathic surgery in Dong-A University Medical Center participated in this study. Lateral cephalometrics, within 3 weeks prior to surgery and 3 days after surgery, were used for analysis. Pre and postoperative measurements of the occlusal plane angle and incisal inclination based on the Frankfort horizontal (FH) plane were performed. X and Y were defined as the amount of vertical change in the upper incisor tip and the amount of vertical change in the upper first molar mesial cup tip through the operation. The amount of final posterior maxillary impaction was determined by subtracting Y from X, which is the difference in vertical height. According to the amount of posterior maxillary impaction, the change in the occlusal plane angle and incisal inclination was measured. Results: The average posterior maxillary impaction was 2.91 mm and the average change in the occlusal plane angle and incisal inclination was $6.54^{\circ}$after surgery. As a result, each mm of posterior maxillary impaction changed the occlusal plane angle and incisal inclination by $2.25^{\circ}$. Statistically, there was high significance. Two cases were observed: one with the same amount of posterior maxillary impaction performed on both the right and left showing $2.20^{\circ}$, and the other with a different amount of posterior maxillary impaction performed showing $2.35^{\circ}$. In this case, there was no significance difference between the two cases. Conclusion: Each mm of posterior maxillary impaction changes the occlusal plane angle and incisal inclination by an average of $2.25^{\circ}$. In posterior maxillary impaction, there was no significant difference in the amount of change in the occlusal plane angle and incisal inclination regardless of whether there was an equal amount of posterior maxillary impaction on both sides. This study is expected to help in the presurgical orthodontic preparation and presurgical treatment planning.

Clinical study on the food impaction between implant prostheses and adjacent teeth (임플란트 보철물과 인접치 사이의 식편압입에 관한 임상적 연구)

  • Shin, Dong-Wook;Lee, Jin-Han;Kim, Se-Yeon;Dong, Jin-Keun
    • The Journal of Korean Academy of Prosthodontics
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    • v.52 no.1
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    • pp.27-33
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    • 2014
  • Purpose: The purpose of this study was to investigate the food impaction between implant prostheses and adjacent natural teeth. Materials and methods: For this study, 51 patients with food impaction were selected and investigated mobility, tightness of contact area, gingival index, plaque index, attachment loss, alveolar bone level, proximal caries, marginal ridge distance and occlusal relationships. Results: Food impaction was found in the upper teeth (60.7%) more than the lower teeth (39.2%). Food impaction was occurred on mesial side of implant prostheses (86.2%) more than distal side (13.7%). Food impaction was mostly found in loose or open contact area (94.2%). Food impaction was frequent on stepped relationship between implant and adjacent teeth. Conclusion: Treatment plan should include proper adjacent and antagonistic occlusal plane and occlusal surface, to prevent food impaction, and the plan should include less adjacent tooth mobility with proper tightness between implant prostheses and adjacent teeth.

Rupture of a large colon associated with sand impaction in a Thoroughbred horse (Thoroughbred 말에서 sand impaction과 연관된 대결장 파열 1례)

  • Yang, Jae-Hyuk;Yang, Young-Jin;Moon, Ja-Ho;Kim, Han-Nah;Hwang, Kyu-Kye;Lim, Yoon-Kyu
    • Korean Journal of Veterinary Research
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    • v.45 no.4
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    • pp.601-606
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    • 2005
  • The disease causing colic is the greatest cause of death in the domestic horse population today and accidental deaths as a result of colic leads to decreased productivity and economic losses in the horse breeding industry. Large colon impaction is the most common cause of colic in horses. Horses may ingest sand either by eating from the ground in sandy locations, or because of its inclusion in hay. In certain areas sand impaction is relatively common. The horse (4 year, female) presented with abdominal pain, which was charactered by willing to lie down, pawing, and looking at flank. A month later, the horse died suddenly at sand paddock. Post-mortem examination revealed the sand impaction as a lot of feces, sand and gravels in the right dorsal colon. In addition, there was necrosis and debilitation in mucosal lining of the large colon and rupture site on the right dorsal colon. The purpose of this article is to review sand impaction and emergencies in Thoroughbred horses.

A Case Report of Fecal Impaction in a Child without Abdominal Symptoms (분변 감입을 동반한 무증상의 심한 소아변비 치험례)

  • Jeong, Ji Eun;Jang, In Soo;Jeong, Min Jeong
    • The Journal of Pediatrics of Korean Medicine
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    • v.34 no.4
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    • pp.101-107
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    • 2020
  • Objectives The purpose of this study is to report the case of fecal impaction in a child without any abdominal symptoms treated by taking herbal medicine. Methods We examined a 7-year-old girl who had normal bowel movement and defecation per day, and had no particular abdominal symptoms. Abdominal radiography was taken, and unexpected severe fecal impaction was observed throughout the abdominal cavity, filled with intestinal gas and feces. According to the subject's parents, she had no generalized symptoms, such as abdominal pain or distension, and had on a regular diet and normal bowel movement daily. She was treated with herbal medicine (Daeseunggi-tang) for 23 days. While she was on the therapy, numbers, doses, bowel movements, and radiography were checked and recorded. Results During the treatment, her stool was softened, and fecal impaction was relieved as showed by abdominal radiography. Conclusions We have identified that there are cases where subjects have no symptoms of abdominal pain, despite presence of severe fecal impaction. In addition, it was found that Daeseunggi-tang is effective in fecal impaction in childhood.

A COMPARATIVE STUDY ON CROWDING ACCORDING TO THE STATUS OF THE THIRD MOLARS IN MANDIBULAR ARCH (하악 치열궁에서 제 3 대구치 맹출상태에 따른 밀집에 관한 연구)

  • Song, Joo-Hun;Ryu, Young-Kyu;Oh, Chang-Ok
    • The korean journal of orthodontics
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    • v.24 no.4
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    • pp.773-785
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    • 1994
  • It has been generally believed that the impaction or eruption of mandibular third molars has significant correlations with the growth of the mandible, size of mandibular arch and size of teeth. The purpose of this study was to examine if there is any correlation between the status of eruption of mandibular third molars and the amount of mandibular crowding. The effect of missing of third moalrs to mandibular crowding was studied as well. 140 adult students of Yonsei University were selected and divided into three groups according to the status of mandibular third molars, Group 1) congenital missing group, Group 2) eruption group, and Group 3) impaction group. The tooth size, dimensions of the mandibular dental arch, and the amount of crowding were measured and compared. Results were as follows ; 1. There was no statistically significant difference in tooth size between the missing group and the eruption group(p<0.05). Impaction group showed larger total tooth material, inci- sal tooth material, and individual tooth size except central incisors compared to missing group (p<0.05). Impaction group showed larger total tooth material, incisal tooth material compared to eruption group as well(p<0.05). When individual tooth size was compared, impaction group had larger central incisors, canines, and second premolars than eruption group(p<0.05). 2. Missing group showed larger intermolar width than impaction group and it was stati- stically significant(p<0.05). 3. When compared the amount of total crowding, impaction group showed the largest am- ount of crowding, then eruption group, and missing group showed the least amount of crowding respectively(p<0.05). There was no statistically significant difference between missing stoup and eruption group in the amount of incisal crowding(p<0.05). Impaction group show- ed the largest amount of incisal crowding among all three groups(p<0.05).

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Teeth impaction, and eruption guidance of impacted teeth by surgical exposure in child and adolescent (임상가를 위한 특집 3 - 소아 청소년에서 발생한 치아의 매복 및 외과적 노출술에 의한 매복치의 맹출유도)

  • Nam, Soon-Hyeun
    • The Journal of the Korean dental association
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    • v.52 no.5
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    • pp.281-290
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    • 2014
  • Tooth eruption disturbance is seen commonly in mixed dentition or early permanent dentition. During this period of time, children experience the growth and development of craniofacial skeleton and dentition, so the impaction and eruption disturbance of permanent teeth make many problems in oral and maxillofacial areas. Eruption guidance of impacted tooth is not simple because many factors related to impaction are considered. Several factors such as etiology, tooth development stage, location of impacted teeth or eruption pathway, patient cooperation, etc. need to be taken into consideration in deciding the management of the impacted tooth. In the present study, it was assessed the etiology and impaction status of impacted tooth through various cases, and try to explain the treatment method to guide eruption by surgical exposure.

Food impaction related with trauma from occlusion (임플란트 보철물의 식편압입: 교합적 원인분석과 대처)

  • Cho, Lee-Ra
    • The Journal of the Korean dental association
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    • v.52 no.8
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    • pp.491-505
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    • 2014
  • Food impaction between the implant prostheses and adjacent teeth is the most frequently observed problem. It may be caused by the migration of the adjacent teeth. This symptom may be observed at the mesial aspect of implant prostheses especially, and related with the multiple contributing factors including teeth vitality and antagonist. Idal proximal contact with optimal strength and shape should be made for preventing the food impaction. Shape of customized abutment and prosthesis should have optimal emergence profile. Long duration from the extraction to the delivery of implant prostheses, the adjacent teeth and antagonist teeth may have possibility of occlusal interferences. Remained teeth mobility can induce the food impaction regardless of interproximal contact strength. Occlusal adjustment to remove occlusal interferences can be a method for enhancing the stability of interproximal contact.