• 대한소아치과학회지
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• 제35권3호
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• pp.571-577
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• 2008

유치열에서의 치근파절은 유치열의 손상 유형 중 $2{\sim}7%$ 정도를 차지하고 생리적 치근흡수가 시작하는 $3{\sim}4$세 쯤 흔히 나타난다. 파절선의 위치에 따라 치근단 1/3, 중간 1/3, 치경부 1/3으로 분류되며 치경부 1/3에서의 치근파절이 예후가 가장 불량하다. 유치의 치근파절이 발생한 경우 파절편의 변위가 적고 감염의 소견이 없으면 영구치의 경우와 같이 $2{\sim}3$개월의 선부자고정으로 치료할 수 있으나, 파절편의 동요 및 변위가 심하거나 선부자고정을 할 수 없을 때에는 치관부 파절편은 제거하고 영구치배의 안전을 위해 치근부 파절편은 잔존시킨다. 본 증례는 유전치의 치근파절이 발생하여 치관부 파절편의 변위가 심한 경우에서 발치하지 않고 정복 후 선부자 고정을 $1{\sim}3$개월 간 시행하고, 파절편의 동요, 동통, 치수괴사, 감염 등의 증상없이 치유되는 양호한 결과를 얻었기에 보고하고자 한다.

• 대한치과보철학회지
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• 제62권2호
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• pp.165-173
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• 2024

상실 부위를 수복하는 경우 정출된 치아에 대한 치료는 반드시 필요하다. 특히 치아 상실이 구치부에서 발생하여 구치부 지지의 상실이 지속되면 하악의 점진적인 위치를 이동시키면서 교합의 변화를 유발하기도 한다. 본 임상 증례는 상악 좌측 구치부 및 하악 우측 제1대구치 상실이 장기간 지속됨에 따라 대합치가 정출되고 교합평면이 무너진 환자에서 임플란트를 이용하는 고정성 보철물로 구치부 지지를 회복하고자 하였다. 정출된 부위의 교합평면을 수정하기 위해, 상실 부위의 진단 왁스업을 레진으로 복제하여 이를 상악에 장착한 후 교합면을 삭제하였다. 또한 임플란트 식립을 위해 디지털 기술을 활용한 임플란트 식립 가이드를 제작하였다. 임플란트의 식립으로 구치부의 지지가 회복된 이후에 진단 납형을 반영한 임시 수복물을 통해 충분한 시간동안 안정적인 교합 상태를 관찰하였고, 이후 임시 수복물의 형태를 복제한 단일 결정 지르코니아 보철물을 환자에게 장착함으로써 기능적, 심미적으로 만족스러운 결과를 얻었기에 이를 보고하는 바이다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제32권3호
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• pp.276-281
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• 2010

The maxillary posterior area is the most challenging site for the dental implant. After missing of teeth on maxillary posterior area due to periodontal problems, the remaining alveolar ridge is usually very thin because of not only pneumatization of maxillary sinus but also destruction of alveolar bone. The maxillary sinus bone graft procedure is one of the most predictable and successful treatments for the rehabilitation of atrophic and pneumatized endentulous posterior maxilla. But, in case of severe destruction of alveolar bone due to periodontal problems, very long crown length is still remaining problem after successful sinus graft procedures. We performed vertical augmentation of maxillary posterior alveolar ridge using mandibular ramal block bone graft with simultaneous sinus graft. After this procedures, we could get more favorable crown-implant ratio of final prosthodontic appliance and more satisfactory results on biomechanics. This is a preliminary report of the vertical augmentation of maxillary posterior alveolar ridge using mandibular ramal block bone graft with simultaneous sinus graft, so requires more long-term follow up and further studies.

• Restorative Dentistry and Endodontics
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• 제13권2호
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• pp.307-322
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• 1988

The purpose of this study is to evaluate the pulpal responses to the base materials such as zinc oxide eugenol cement, calcium hydroxide, zinc phosphate cement, polycarboxylate cement and glass ionomer cement. The 100 caries free dog teeth were devided into 2 groups by remaining dentin thickness (Group A: 0.4-0.6 mm, Group B: 0.8-1.0 mm) and each group were devided into 5 subgroups. The intervals of observation period are 3days, 1 week, 2 weeks, 4 weeks and 8 weeks respectively after experiment. The specimens were fixed with 10% formalin and decalcifed in 5% nitric acid. All specimens were stained with Hematoxylin-Eosin and examined histopathologically. The results were as follows. 1. In group A, atropy or hyperplasia in odontoblasts were seen in zinc oxide eugenol cement, calcium hydroxide and zinc phosphate cement. No changes in odontoblasts were seen in polycarboxylate cement and glass ionomer cement. 2. In group A, increase of predentin were seen in all experimental materials. 3. In group A, vascular congestion were seen in all experimental materials and inflammation were seen on 3 days in zinc oxide eugenol cement, 8 weeks in zinc phosphate cement and hemorrage were seen on 3 days in zinc phosphate cement. 4. In group B, changes of odontoblasts were not seen all experimental materials. 5. In group B, increase of predentin and vascular congestion were seen in all experimental materials but inflammation were not seen.

• Restorative Dentistry and Endodontics
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• 제24권4호
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• pp.554-559
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• 1999

Aucubin, an iridoid glucoside isolated from Aucuba japonica, has pharmacological effects such as antimicrobial effect, liver protective function and inhibition of liver RNA and protein biosynthesis, etc. This study was performed to observe the effect of aucubin on the pulp tissue after pulpotomy. Aucubin was converted to aucubinogenin as an active form by ${\beta}$-glucosidase. In 3 Mongrel dogs, the pulps were mechanically exposed with a sterile round bur and excised with sterile excavator. After bleeding control, aucubin was applied on remaining pulp tissues and then they were sealed with IRM in experimental group. In control group, $Ca(OH)_2$ powder was applied on remaining pulp tissues and then they were sealed with IRM. After interval of 1 and 12 weeks, the dogs were sacrificed. The teeth were prepared for histologic evaluation and examined by light microscope. Aucubin 1 week group showed that mild inflammation and vascular congestion in most of the specimen. More various degree of inflammation was found in experimental group than in control group. Premature calcified mass were found in the both 1 weeks groups. Continuous well-formed dentin bridge was found in both 12 weeks groups. Collectively, this study suggests that the possibility of aucubin as a medicament after pulpotomy.

• 대한심미치과학회지
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• 제24권2호
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• pp.86-100
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• 2015

남아있는 자연치아와 어울릴 수 있도록 치과의사와 치과기공사는 최선의 노력을 다한다. 기능성과 심미성을 완벽하게 재현한 세라믹은 큰 감동을 환자에게 전달해 주고 있다. 그러나 쉽지 않은 문제들을 극복해내야 한다. 서로 다른 두 물체가 완벽하게 같은 스펙트럼 곡선을 가지는 일은 거의 있을 수 없다. 스펙트럼 곡선과 반사율은 물체만의 고유한 특징이다. 지문과 같다고 할 수 있다 그렇기에 우리가 보통 색을 맞춰준다라고 이야기하는 것은 스펙트럼 곡선을 동일화 하는 것이 아니라 우리가 인지하는 색의 조합을 같은 것으로 만들어 주는 조건 등색 과정을 이해해야 한다. 즉, 우리 분야에서 살펴 보자면 색을 맞추려는 환자의 자연치아와 세라믹이 우리 망막의 원추체를 같은 조합으로 자극하게 맞춰주는 과정이다.

• 지역사회간호학회지
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• 제28권3호
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• pp.302-312
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• 2017

Purpose: The purpose of this study was to identify associated factors of chewing discomfort among community-dwelling elderly. Methods: The study was cross-sectional design and secondary data analysis using the 6th Korea National Health and Nutrition Examination Survey. Among the total of 7,550 participants, data was analyzed with 1,126 adults aged 65 years and over. Chewing discomfort was assessed by the perceived chewing discomfort. Multivariate logistic regression analysis was used to find the associated factors of chewing discomfort. Results: Along with 61.7% of the participants reported having chewing discomfort, 85.2% reported to perceive poor oral health and 35.0% had oral pain. In multivariate logistic regression, perceived oral health (OR 3.22, 95% CI 2.24~4.63), oral pain (OR 2.46, 95% CI 1.76~3.43), activity limitation (OR 1.71, 95% CI 1.05~2.80), teeth requiring treatment (OR 1.61, 95% CI 1.14~2.26), number of remaining teeth (OR 1.60, 95% CI 1.22~2.10) and educational level (OR 1.56, 95% CI 1.15~2.12) were the significant predictors of chewing discomfort. Conclusion: The prevalence in chewing discomfort was high in elderly Koreans and various factors were associated with chewing discomfort. To improve chewing ability, it is suggested that the national level of policies offer strategical oral health programs in this population.

• The Journal of Advanced Prosthodontics
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• 제3권1호
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• pp.51-55
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• 2011

BACKGROUND. Mandibular displacement is a common complication of condylar fracture. In the mandibular displacement due to condylar fracture, it is difficult to restore both esthetics and function without using orthognathic surgery. CASE DESCRIPTION. This clinical report described a full mouth rehabilitation in the patient with bilateral condylar fractures and displaced mandible using bilateral sagittal split ramus osteotomy (BSSRO) and simultaneous dental implant surgery. Mandibular position was determined by model surgery through the diagnostic wax up and restoration of fractured teeth. The precise amount of the mandibular shift can be obtained from the ideal intercuspation of remaining teeth. CLINICAL IMPLICATION. Mandibular displacement by both condylar fractures can be successfully treated by orthognathic surgery. Determination of occlusal plane and visualization from diagnostic wax up are mandatory for mandibular repositioning of model surgery. Stable occlusion and regular recall check up are needed for long-term outcome.

• 대한치과기공학회지
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• 제24권1호
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• pp.127-138
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• 2002

There are some cases that dental prosthesis does not operate as properly as expected in oral mouth. The reasons are such as a distortion of the mandibular, a fault of impression taking system or an extrusion of remaining teeth. One of dental prostheses to consider in the situations is the attachment which connects segment bridge. Active discussions are managed on theoretical side of this field but few on clinical side of it, which must be considered first. Accordingly I'd like to suggest a theoretical background for connect attachment of fixed segmented bridge. 1. As a bridge gets longer, burden on dental ligament is increased and the hardness of a bridge is lessened. 2. The flexibility of a bridge increases in ratio to 3 multiplication of the length and decreases in ratio to 3 multiplication of the width of occlusal surface and base of pontic. 3. Precision rest is needed to cope with the shake of teeth and the difference of axis direction among abutments. 4. Female part of the precision rest should be on middle abutment distal and male one on mesial of pontic. 5. Segmented attachment can be efficiently used to cope with long span bridgework and also in case that one piece casting can't be done because of slant of abutment.

• Restorative Dentistry and Endodontics
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• 제40권4호
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• pp.286-289
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• 2015

Objectives: The aim was to evaluate dentinal crack formation after root canal preparation with ProTaper Next system (PTN) with and without a glide path. Materials and Methods: Forty-five mesial roots of mandibular first molars were selected. Fifteen teeth were left unprepared and served as controls. The experimental groups consist of mesiobuccal and mesiolingual root canals of remaining 30 teeth, which were divided into 2 groups (n = 15): Group PG/PTN, glide path was created with ProGlider (PG) and then canals were shaped with PTN system; Group PTN, glide path was not prepared and canals were shaped with PTN system only. All roots were sectioned perpendicular to the long axis at 1, 2, 3, 4, 6, and 8 mm from the apex, and the sections were observed under a stereomicroscope. The presence/absence of cracks was recorded. Data were analyzed with chi-square tests with Yates correction. Results: There were no significant differences in crack formation between the PTN with and without glide path preparation. The incidence of cracks observed in PG/PTN and PTN groups was 17.8% and 28.9%, respectively. Conclusions: The creation of a glide path with ProGlider before ProTaper Next rotary system did not influence dentinal crack formation in root canals.