• Restorative Dentistry and Endodontics
• /
• 제7권1호
• /
• pp.53-57
• /
• 1981

A total of 130 extracted human maxillary second molars were used to study the configuration of the floor of the pulp chamber. The specimens were ground and the pulp chamber was examined with a magnifier and explored with sharp explorer. The study showed the shape of the pulp chamber, number of root canals, and the type of canal orifice. The results were as follows; 1. In so far as observing the shape of the pulp chamber of the teeth, 16.9% of the teeth were quadrilateral, 70.0% were triangle and 13.1% were ovoid shape. 2. 13.1% of the specimens have 4 root canal orifices. 73.9% have 3 root canal orifices, 11.5% have 2 root canal orifices and 1.5% have single orifice. 3. 13.1% of the specimens have 2 mesio-buccal canal orifices and among the teeth those have 3 canals, 20.8% show 'Y' shape, 29.1% show straight line and 23.8% show obtuse triangle shape.

• Restorative Dentistry and Endodontics
• /
• 제12권2호
• /
• pp.27-32
• /
• 1987

After a vital pulpotomy in human permanent teeth, the responses of the remaining pulp tissue under formocresol was studied histologically. The class I cavity was prepared on the teeth and the pulp was amputated. Formocresol was placed over the amputated tissue and the cavity was sealed with zinc phosphate cement and amalgam. The teeth were extracted after 1, and 3 weeks following the operation and were decalcified, sectioned and stained with hematoxylin and losin. Microscopic examination reveals as follows; I. Healing of the pulp at the amputated site did not occur in the pulps treated with formocresol. 2. At one week the pulps were normal except only slight inflammatory reaction. 3. At three weeks, the pulps showed the most serious inflammation, bleeding and necrotic state.

• 대한소아치과학회지
• /
• 제33권1호
• /
• pp.122-130
• /
• 2006

선천성 치아 결손(congenital missing teeth)은 1개 이상 치아의 선천적 결손으로 hypodontia라고도 불리며 인간에서 가장 흔한 치아 발육 이상이다. 그러나 6개 이상 영구치가 결손되는 severe hypodontia, 또는 oligodontia의 경우는 $0.3{\sim}0.4%$의 매우 낮은 유병율을 보인다. 이환치는 제3 대구치, 상악 측절치, 하악 제2 소구치 순으로 빈발한다. 원인은 정확하게 알려진 바는 없고 외배엽 이형성증, 다운 증후군과 같은 전신질환이나 특정 유전자의 돌연변이와 연관되어 나타나기도 한다. 선천성 치아 결손이 존재하면 비이환치의 위치 이상이나, 악골 발육 감소, 심미적, 기능적 문제 등이 발생할 수 있다. 조기발견을통한 해당유치의 보존이 중요하며 이러한 상황의 개선을 위해 한 사분악 당 최소의 저작 단위를 확보할 수 있도록 교정적, 보철적으로 포괄적 인 치료가 필요하다. 본 증례는 전신질환이 없는 다수의 영구치 선천 결손 환아에 대한 보고로써 이들은 교정치료와 간격유지를 위해 주기적으로 내원하고 있다.

• 한국치위생학회지
• /
• 제13권4호
• /
• pp.631-637
• /
• 2013

Objectives : The aim of the study is to propose the fundamental data for further developments of the school dental clinic program through evaluating comprehensive improvements of the indices and the oral health status. Methods : This studied was carried out from December 2010 to September 2012. Subjects were 239 elementary school 4th, 5th, 6th grade students having no school dental clinic and 195 elementary school 4th, 5th, 6th grade students having school dental clinic in Busan. They completed self-reported questionnaires after accepting informed consent. The questionnaire included knowledges, attitudes and practices for oral health recognition and supports of the school dental clinic program. Results : Permanent tooth caries prevention rate revealed 59.0%, 53.3%, and 62.0%. in 4th, 5th, and 6th respectively. Rate of Care Group with fissure sealant permanent teeth showed 80.3%, 88.0%, and 88.9% respectively. Index of Care Group with fissure sealant permanent teeth revealed 2.68, 2.90, and 3.97, respectively. DMFT index of Care Group was 1.11, 1.35, and 1.51, respectively. Active D rate of Care Group resulted in 16.7%, 24.1%, and 16.7%, respectively. Dental health education group showed high awareness level of fluoride and sealant effect for caries prevention. Tooth brushing of three times per day was more effective when using rolling tooth brushing. On the other hand, oral health recognition and oral status in the control group was low. Conclusions : Oral health recognition was closely related to good oral care. Expansion of oral health care business is important to prevent dental caries. Systematic approach for oral health education programs and human resources development is very important to improve oral health care.

• 대한소아치과학회지
• /
• 제23권2호
• /
• pp.291-305
• /
• 1996

유치 및 초기 영구치의 치수신경분포 및 변화를 평가하기 위하여 교정치료를 위해 발치한 치근흡수가 비교적 적은 유치, 정상 탈락기의 유치, 맹출중인 교합하지 않은 제 1소구치, 맹출이 완료되어 교합하고 있는 제 1소구치를 대상으로 neurofilament protein(NFP) 을 이용 한 변역조직화학적 방법으로 관찰하여 다음과 같은 결과를 얻었다. 치근흡수가 비교적 적은 유치에서도 영구치와 유사한 신경총의 존재와 신경분포 형태가 관찰되었으나, 영구치에 비해 그 신경분포의 밀도가 낮았으며 분지형성 또한 미약하게 나타났고, 전상아질로 진입하는 섬유의 수가 적었다. 정상탈락기의 유치에서는 신경의 변성으로 소포(vesicle), 단절(fragmentation)등이 관찰되었으며, 그 신경분포가 현저히 감소되어 나타났고, 총상의 형태도 소실되었다. 교합하지 않은 제 1소구치에서 치수 내의 신경은 말단가지의 숫자가 적고, 치수 조상아 세포 경계에 도달하였으며, 비교적 가는 신경 섬유가 많았다. 교합하고 있는 제 1소구치에서 치수 내의 신경은 말단이 조상아층으로 진출하고, 어떤 신경섬유는 전상아질층까지 진입하였으며, 비교적 굵은 신경섬유의 분포가 많아졌다.

• Restorative Dentistry and Endodontics
• /
• 제39권3호
• /
• pp.230-234
• /
• 2014

This study describes the treatment of an immature permanent tooth with periapical lesion which was treated with regenerative approach using platelet rich plasma (PRP). The root canal of immature human permanent tooth with periapical lesion was gently debrided of necrotic tissue and disinfected with 2.5% NaOCl, and then medicated with triple antibiotic paste comprised of ciprofloxacin, metronidazole, and tetracycline. When the tooth was asymptomatic, PRP and mineral trioxide aggregate (MTA) were placed into the root canal. Six months after PRP treatment, radiographical examination revealed resolution of the radiolucency and progressive thickening of the root wall and apical closure. Our findings suggest that PRP can be used for the treatment of immature permanent teeth with periapical lesion, as part of a regenerative endodontic treatment procedure.

• 대한치과의사협회지
• /
• 제22권5호통권180호
• /
• pp.423-427
• /
• 1984

A total of 114 extracted human mandibular first molars were used to study the configuration of the floor of the chamber. The specimens were ground and the pulp chamber was examined with a magnifier and explored with sharp explorer. The study showed the shape of the pulp chamber, number of root canals, and the type of canal orifice. The results were as follows; 1. In so far as observing the shape of the pulp chamber of the teeth, 58.8% of the teeth were square, 34.2% were triangle and 7.0% were ovoid shape. 2. 58.8% of the specimens have 4 root canal orifices, 34.2% have 3 root canal orifices, 7.0% have 2 root canal orifices. 3. 41.2% of the specimens show 'H' shape, 17.6% show 'Square' shape, 31.6% show 'T' shape, 2.0% show 'reverse-T' shape and 7.0% show 'I' shape.

• Restorative Dentistry and Endodontics
• /
• 제12권1호
• /
• pp.165-169
• /
• 1986

A total of 114 extracted human mandibular 2nd molars were used to study the configuration of the floor of the chamber. The specimens were ground and the pulp chamber was examined with a magnifier and explored with sharp explorer. The study showed the shape of the pulp chamber, number of root canals, and the type of canal orifice. The results were as follows, 1. In so far as observing the shape of the pulp chamber of the teeth, 47.4% of the teeth were square, 42.9% were triangle and 9.7% were ovoid shape. 2. 35% of the samples had 2 root canal orifices, 62% had 3 root canal orifices, 3% had 4 root canal orifices. 3. 3% of the specimens showed 'H' shape, 5% showed 'Square' shape, 51% showed 'T' shape, 1% showed 'reverse-T' shape, 35% showed 'I' shape and 5% showed the specific 'C' shape.

• Restorative Dentistry and Endodontics
• /
• 제4권1호
• /
• pp.23-27
• /
• 1978

Fifty two mandibular permanent canines were chosen to study the anatomy of the root canal. The experimental teeth were injected with China ink, decalcified, cleared and observed to investigate the number of root canals, frequency and location of lateral canals, the location of apical foramens, the frequency of apical deltas, and the curvature of root canals. The results were as follows: 1) all of the experimental teeth demonstrated single canal. 2) of the 52 canals, 9.6% of the canals were found to have lateral canals and the locations of the lateral canals were in the apical third of the roots 3) Thirty three apical foramens were located laterally on the root apices and nineteen foramens were located on the centers of the root apices. 4) 37 canals showed straight curvature, 12 canals distal curvature. 3 canals labial curvature.

• Restorative Dentistry and Endodontics
• /
• 제4권1호
• /
• pp.11-16
• /
• 1978

This experimental study was made to investigate the effect of the "Hi-Pol" composite resin on the human dental pulp. 38 cavities of healthy permanent teeth were divided into 5 groups which were used as experimental materials. Group 1: Zinc Oxide-Euginol paste was applied to the cavities as controls $\cdots\;\cdots8$ cases Group 2: "Hi-Pol"*filling with Dycal** base $\cdots\;\cdots9$ cases Group 3: "Hi-Pol" filling without Dycal base $\cdots\;\cdots9$ cases Groud 4: Adaptic*** filling with Dycal base $\cdots\;\cdots6$ cases Group 5: Adaptic filling without Dycal base $\cdots\;\cdots6$ cases The treated teeth were extracted after 1 week, 2 weeks, 3 weeks and 4 weeks and processed for histological study. The results obtained from this experimental study were as follows; 1. The controls applied zinc oxide-eugenol showed the minimal pulp response and group 3 and group 5 showed the most severe pulp response. 2. In group 3 and group 5, the severity of pulp response increased in intensity according to the time elapsed. 3. In group 2 and group 4, the mild pulp response was found in earlier stage and the repairing process could be observed in later stage. * Boo-Pyung Co., Korea ** L. D. Caulk Co., Milford, Del. 19963 *** Johnson and Johnson Co., New Brunswick, NJ 08903.