PurposeThe purpose of this study was to assess and compare the clinical and radiographic outcomes of guided tissue regeneration therapy for human periodontal intrabony defects using two different collagen membranes: a porous nonchemical cross-linking collagen membrane (NC) and a bilayer collagen membrane (BC).MethodsThirty subjects were randomly assigned and divided into the following 3 groups: a test group (NC+BM), in which a NC was used with xenograft bone mineral (BM), a positive control group (BC+BM), in which a BC was used with xenograft BM, and a negative control group (BM), in which only xenograft BM was used. The following clinical measurements were taken at baseline and 3 months after surgery: plaque index, gingival index, probing pocket depth, gingival recession, and clinical attachment level. Radiographic analysis was performed at baseline, 1 week and 3 months after surgery.ResultsMembrane exposure was not observed in any cases. Significant probing depth reduction, attachment-level gain and bone fill were observed for both test and control groups compared to baseline at 3 months after surgery (P<0.05). However, there were no statistically significant differences in clinical improvement and radiographic bone fill between treatment protocols (P>0.05).ConclusionsWithin the limitations of this study, the results suggest that both NC and BC were comparable in terms of clinical and radiographic outcomes for the treatment of periodontal intrabony defects in human subjects.Graphical Abstract

PurposeThe aim of this study was to explore root shape abnormalities, to investigate the influence of root form abnormalities on periodontal attachment loss, and to gather basic data to assist in the diagnosis and treatment of aggressive periodontitis.MethodsFrom January 2010 to June 2012, a survey was conducted of all 3,284 periodontitis patients who visited the Department of Periodontology, Daejeon Dental Hospital, Wonkwang University School of Dentistry. Clinical parameters (probing depth, periodontal attachment loss, missing teeth) were measured and a radiographic examination was performed at the baseline. We classified the root shape abnormality of bicuspids and molars based on Meng classification.ResultsThe periodontal attachment loss was the highest at the maxillary first molar (6.03 mm). The loss of the second molar was prominent. Type V deformity was shown to be the most common in the second maxillary and mandibular molars (P<0.05). Type V root shape was associated with the highest attachment loss (P=0.01).ConclusionsConsidering the small population and limited design of this study, definitive conclusions cannot be drawn. We suggest larger scale, methodologically more sophisticated studies that include normal controls and chronic periodontitis patients to clarify whether root form abnormalities are a potential risk factor for aggressive periodontitis.

1,2]. 급진성 치주염의 유병률은 인종과 지역에 따라 매우 다 양하며, 전 세계적으로 0.1%-15% 범위까지 보고되어 있다[3-6]. 한국인의 경우 급진성 치주염의 유병률 연구가 매우 적으나 1987년 Leem 등[7]은 0.09%로 보고한 바 있다. 성(gender)에 따른 질환의 발생률 차이에 대해서 아직까지 일관된 결론은 없 으나, 2005년 Susin과 Albandar [8]은 남녀 간에 차이가 없음을 보고한 바 있다. 급진성 치주염은 그 임상적 양상에 따라 국소적 형태와 전반 적 형태로 분류할 수 있다. 국소적 형태의 경우 구강 내 다른 부 위에 비해 전치부 및 제1대구치에서 부착소실이 주로 발생하며, 좌우 대칭적으로 나타나는 경우가 많다[9]. 국소적 형태로 시작 하여 전반적 형태로 진행하게 되는데, Mombelli 등[10]은 전반 적 형태의 급진성 치주염과 만성 치주염에서 치은연하 미생물 총에 차이가 거의 없음을 보고하였다. 현재까지 급진성 치주염 치료를 위한 방안으로는 만성 치주 염의 치료와 마찬가지로 비외과적 치주치료, 판막거상소파술 을 포함한 외과적 치주치료, 지속적인 유지치주치료 등이 제시 되었다[11-13]. 급진성 치주염 환자의 치아 유지에 대한 논란의 여지는 있으나 대부분 전통적인 치주치료를 통해 장기간 동안 안정적으로 유지됨이 보고되고 있다[14,15]. 한국인에서 치주질환 치료에 대한 전문 진료 수요 중 상당수 의 환자가 급진성 치주염의 양상을 보이고 있고 비교적 젊은 연 령에 비해 심각한 수준으로 치주조직이 파괴된 상태로 대학병Tooth loss in aggressive periodontitis patients: retrospective study with follow-up of 3 to 8 yearsThe purpose of this study was to assess the clinical outcomes of active periodontal therapy (APT) and supportive periodontal therapy (SPT) through loss of teeth in the Korean patients with aggressive periodontitis. The number of missing and residual teeth, probing pocket depth were examined in 33 patients diagnosed with aggressive periodontitis at the baseline and who had participated in APT and SPT for 3 years or more. A 20 and 3 teeth were lost during the APT and SPT, respectively. The mean tooth loss rate of 0.13 per patient and year. There was no significant statistical difference in clinical improvement between the smoker and non-smoker groups.Within the limitation of this study, APT combined with supportive therapy could decrease the risk of tooth loss in patients suffering from aggressive periodontitis.