• Proceedings of the KACD Conference
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• 2003.05a
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• pp.291-291
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• 2003

손상에 의한 치근 흡수는 표면 흡수(surface resorption), 염증성 흡수(inflammatory resorption) 및 대치성 치근 흡수(replacement resorption)가 있는데 치근 흡수의 정도는 탈구와 재식 사이의 시간, 치주 인대의 손상 정도, 탈구된 치아의 보관 조건 및 치아 발육 정도 등에 영향을 받는다.(중략)

• Journal of the korean academy of Pediatric Dentistry
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• v.43 no.3
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• pp.254-263
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• 2016

Many studies on the prognosis of avulsed teeth were published but follow-up studies on Korean children and adolescents are insufficient. The aim of this study was to identify clinical factors determining the healing and prognosis of permanent incisors that were replanted after avulsion injury. This study included 184 permanent teeth in 142 patients aged 6-14 years. The clinical and radiographic data of the patients were analyzed from electronic medical records. Immature teeth had a higher probability of pulp revascularization than mature teeth. When extra-alveolar time was longer than 60 minutes, the incidence of inflammatory root resorption (IRR) was higher in immature teeth than mature teeth. However, the incidence of replacement root resorption (RR) was higher in mature teeth than immature teeth under the same condition. The incidence of IRR was increased when pulp was extirpated more than 20 days after replantation. IRR had a more significant influence on the decrease of survival expectation than RR. There was no significant correlation between the root development stage and survival expectation. However, when RR occurred, immature teeth survived shorter than mature teeth. Long term follow-up results from this study are expected to be used as fundamental data for the treatment guidelines and evaluation of the prognosis of replanted teeth.

• Journal of the korean academy of Pediatric Dentistry
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• v.34 no.2
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• pp.192-203
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• 2007

This study histologically assessed the effect of topical alendronate application on periodontal healing in replanted teeth in fifty four SD Rats. Upper first molars in rat were extracted and replanted after dried during 15 minutes or 60 minutes in the air. In Group I, all teeth were replanted after 15 minutes of dry storage without any other treatment. In Group II and III, the pulps were removed and all teeth were replanted after soaking 10 min in Hank's balanced salt solution with/without alendronate, followed by 60 minutes of dry storage. the rats were sacrificed after 7, 15 and 30 days. The histological parameters studied were healed PDL, surface inflammatory and replacement resorption, and inflammatory severity. The following conclusions could be drawn from the present investigation. 1. Group I showed lower inflammatory root resorption and inflammation severity rate, compared to Group II and Group III. In Group I there showed effective for reattachment and regeneration of PDL. 2. In Group II, inflammatory root resorption were more severe and faster than other groups. There were extensive root resorption in the rats sacrificed after 30 days. 3 In Group III, there were localized inflammatory resorption in several areas, but extensive resorption did not occur Group III showed increase in root resorption rate, compared to Group I. However this difference was not statistically significant. 4. There were no difference between sacrificed days in replacement root resorption in all groups.

• The Journal of Korean Academy of Prosthodontics
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• v.30 no.3
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• pp.445-456
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• 1992

A two dimensional finite element model was constructed to analyze the mechanical behavior of a five unit fred partial denture(FPD) with a 2nd premolar pier abutement either employing a rigid or nonrigid connector. Gap elements were used to model the clearance space of the nonrigid connector. All FPDs with rigid or nonrigid connectors reduced the magnitude of stress in the periodontium as compared to the control, with both normal or reduced bone support. An FPD with rigid connectors induced the smallst stresses in the periodontium. A FPD with a nonrigid connector on the mesial of the molar abutment exhibited the most undesirable mechanical stress states and deformations.