• Journal of Dental Anesthesia and Pain Medicine
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• 제21권6호
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• pp.575-582
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• 2021

Background: The aim of this randomized, triple-blind trial was to determine the anesthetic, analgesic, and hemodynamic effects of articaine and bupivacaine in the extraction of impacted mandibular third molar teeth. Methods: Twenty-six patients who underwent removal of bilaterally symmetric mandibular third molars were randomly assigned to articaine and bupivacaine groups in a split-mouth design. The onset of anesthetic action, intraoperative comfort, total amount of solution used, duration of postoperative anesthesia and analgesia, rescue analgesic use, postoperative pain, intraoperative bleeding, and hemodynamic parameters were evaluated. Results: In the articaine group, the onset of anesthetic activity was faster, intraoperative comfort was greater, and effective anesthesia required less local anesthetic solution. The bupivacaine group showed a significantly longer duration of postoperative anesthesia and analgesia, in addition to lower visual analog scale values at 6 and 48 hours postoperatively. There were no significant differences between the two solutions regarding rescue analgesic medication use, intraoperative bleeding, or hemodynamics. Conclusion: Articaine showed greater clinical efficacy than bupivacaine in intraoperative anesthesia, achieving faster onset of anesthetic action and greater patient comfort while also requiring less reinforcement during surgery. However, bupivacaine was superior in terms of postoperative anesthesia, reducing postoperative pain due to its residual anesthetic and analgesic effects. Both anesthetic solutions led to similar hemodynamics at low doses in mandibular third molar surgery

• Restorative Dentistry and Endodontics
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• 제41권3호
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• pp.182-188
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• 2016

Objectives: The purpose of this study was to evaluate the proximity of the mandibular molar apex to the buccal bone surface in order to provide anatomic information for apical surgery. Materials and Methods: Cone-beam computed tomography (CBCT) images of 127 mandibular first molars and 153 mandibular second molars were analyzed from 160 patients' records. The distance was measured from the buccal bone surface to the root apex and the apical 3.0 mm on the cross-sectional view of CBCT. Results: The second molar apex and apical 3 mm were located significantly deeper relative to the buccal bone surface compared with the first molar (p < 0.01). For the mandibular second molars, the distance from the buccal bone surface to the root apex was significantly shorter in patients over 70 years of age (p < 0.05). Furthermore, this distance was significantly shorter when the first molar was missing compared to nonmissing cases (p < 0.05). For the mandibular first molars, the distance to the distal root apex of one distal-rooted tooth was significantly greater than the distance to the disto-buccal root apex (p < 0.01). In mandibular second molar, the distance to the apex of C-shaped roots was significantly greater than the distance to the mesial root apex of non-C-shaped roots (p < 0.01). Conclusions: For apical surgery in mandibular molars, the distance from the buccal bone surface to the apex and apical 3 mm is significantly affected by the location, patient age, an adjacent missing anterior tooth, and root configuration.

• 대한치과교정학회지
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• 제28권2호
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• pp.269-276
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• 1998

마찰견인법으로 상악견치를 후방견인할 때, 저항원상실을 최소로 하며 조절되지못한 경사이동을 예방하기 위한 장치인 MAS(molar anchoring spring)를 고안하여 임상에 적용하였다. 31명(여자 29명, 남자 2명)의 표본에서 MAS를 사용하여 상악견치의 후방견인을 시행하였고, 견인 전후의 측모 두부 방사선 규격사진, orthopantomogram과 치아모형을 채득하였다. 얻어진 정보로부터 상악 제1대구치의 저항원소실 및 상악 견치의 경사이동경향을 조사하여 다음과 같은 결과를 얻었다. 1. 상악 제1대구치의 경우 수직정출과 jntermolar width의 변화가 없었으며, 시상면에서 적은 양의 저항원소실만이 있었다. 2. 상악 견치의 경우 원심경사 및 약간의 압하가 일어났으며 교합이 깊어졌다는 소견은 보이지 않았다.

• Imaging Science in Dentistry
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• 제43권4호
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• pp.289-293
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• 2013

Purpose: This study was performed to determine the relationship between the stage of tooth eruption (both vertical and mesio-angular) and chronological age. Materials and Methods: Indirect digital panoramic radiographs were used to measure the distances from the dentinoenamel junction (DEJ) of the second molars to the occlusal plane of the second molar teeth and of the adjacent third molars in 264 Thai males and 437 Thai females using ImageJ software. The ratio of those distances was calculated by patient age, and the correlation coefficient of the ratio of the third molar length to the second molar length was calculated. Results: The correlation between the height of the vertically erupted upper third molar teeth and age was at the intermediate level. The age range of ${\geq}15$ to <16 years was noted to be the range in which the correlation between the chronological age determined from the eruptional height and actual chronological age was statistically significant. The mean age of the female subjects, in which the position of the right upper third molar teeth was at or above the DEJ of the adjacent second molar but below one half of its coronal height was $19.9{\pm}2.6$ years. That for the left side was $20.2{\pm}2.7$ years. The mean ages of the male subjects were $20.1{\pm}3.3$ years and $19.8{\pm}2.7$ years for the right and left sides, respectively. Conclusion: It might be possible to predict chronological age from the eruption height of the wisdom teeth.

• 대한치과의사협회지
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• 제13권6호
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• pp.559-562
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• 1975

This is a case of the patient, a 15 -year-old girl, presented a marked necrotic osteomyelitis due to misusage of the arsenic compound for devitaliaztion of the lower right 2nd molar in the right posterior part of the mandible. She was obtained good satisfactory results by sequestrectomy of necrotic bone and by removing of lower right 2nd molar and unerupted 3rd molar tooth germ.

• 대한심미치과학회지
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• 제29권1호
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• pp.13-24
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• 2020

임플란트 술식은 그 동안 많은 발전을 하였고, 자연치를 대체할 훌륭한 치료법임에는 부인할 수 없지만 치주인대가 존재하지 않는 구조적 한계점, 발치 직후 시작되는 bundle bone의 흡수는 자연치와 같은 적절한 emergence profile을 만들어내기 어려울 수 있고 이는 심미적인 결과로 이어질 수 있다. 만약 해당 환자의 구강 내에 건전한 제3대구치가 있고, 결손부위의 염증상태가 심각하지 않으면 건전한 제3대구치를 결손된 부위로 이식하여 치아를 재건할 수 있다. 성공적인 자가치아이이식술은 저작기능을 회복하고, 자가치아를 이용하기에 생체 친화적이며, 치조골의 흡수를 예방하는 훌륭한 치료이기 때문에 가능하기만 하다면 첫번째 치료로 충분히 고려될 수 있을 것이다.

• 대한소아치과학회지
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• 제34권1호
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• pp.27-35
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• 2007

본 연구의 목적은 발거된 기성 금관 수복 유구치를 대상으로 변연 적합도를 관찰 분석하는 것이다. 서울대학교 치과병원 소아치과에서 수거한 3M사의 기성 금관 수복 유구치를 대상으로 하였다. 상악 제 1유구치 42개, 상악 제 2유구치 25개, 하악 제 1유구치 37개, 하악 제 2유구치 28개를 대상으로 기성 금관의 변연에 따라 치근을 절단한 후 단면을 Fine Pix S602 디지털 카메라로 촬영한 후 Kappa image base program을 이용해 우각 부위 및 임의로 20부분의 변연 간격과 전체 기성 금관 면적 중 변연 간격의 면적이 이루는 비율을 측정하여 다음과 같은 결과를 얻었다. 1. 평균 변연 간격은 상악 제 2유구치, 하악 제 1유구치, 하악 제 2유구치, 상악 제1 유구치 순으로 높았다 (P<0.05). 2. 평균 변연 간격 면적의 비율은 치아의 종류에 관계없이 약 20%를 상회하는 값을 보였다. 3. 상악 제 1,2유구치에서는 근심면의 변연 간격이 가장 컸고, 하악 제 1유구치에서는 원심 설면, 하악 제 2유구치에서는 협면에서 변연 간격이 가장 큰 값을 보였다.

• 구강회복응용과학지
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• 제24권4호
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• pp.371-379
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• 2008

본 연구의 목적은 안정 시, 임프란트 보철물과 자연치 사이의 인접치간 접촉강도를 평가하는 것이다. 좌측 상악 또는 하악 제2대구치에 단독으로 임프란트가 식립되어 보철물이 장착되어 있는 20명의 피험자를 임프란트 군으로, 좌측 상하악 제1대구치와 제2대구치 사이의 인접부위에 수복물이 없는 10명의 피험자를 대조군으로 나누어 교합력이 작용하지 않는 안정상태에서 인접치간 접촉강도를 평가하였다. 자연치 사이의 인접치간 접촉강도가 전반적으로 높게 나타났고, 특히 하악에서는 통계적으로 유의한 차이를 보였다. 임프란트 보철물에 있어서 인접치간 접촉을 좀 더 강하게 부여할 필요가 있음이 시사되었고 또한 자연치아와 임프란트 보철물사이의 경시적 변화에 따른 인접접촉강도의 변화를 평가할 필요가 있음이 시사되었다.

• 치과방사선
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• 제28권1호
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• pp.87-109
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• 1998

The present study was designed to elucidate the effects of the Co-60 γ irradiation and/or calcium­deficient diet on the dentin and cementum formation of rat molar. The pregnant three-week old Sprague­Dawley rats were used for the study. The experimental group was divided into two groups, irradiation/normal diet group and irradiation/calcium-deficient diet group. The control group was non­irradiation/normal diet group. The abdomen of the rats at the 19th day of pregnancy were irradiated with single absorbed dose of 350cGy. The rat pups were sacrificed on the 14th day after delivery and the maxillae including molar tooth germ were taken. The specimens including the 1st molar tooth germ were prepared to make tissue sections for light and transmission electron microscopy. Some of tissue sections for light microscopy were stained immunohistochemically with anti-fibronectin antibody. The results were as follows; 1. The Hertwig's epithelial root sheath cells, which are related to the differentiation of the tooth-forming cells, showed irregular cellular arrangement, decrease of intercellular junctional complex, and decreased immunoreactivity to the fibronectin after irradiation. These were more severe in the irradiation/calcium-deficient diet group. 2. The cementoblasts at the cementum-forming area showed chromatin clumpings after irradiation. The immu noreactivity to the fibronectin was weaken after irradiation, especially irradiation/calcium-deficient diet group. 3. The odontoblasts at the dentin-forming area showed increase of lysosomes in the cytoplasm and destruction of intercellular junctional complex. The irradiation/calcium-deficient diet group showed decrease of number and density of the electron dense particles and a large number of vacuoles scattered in the dentin matrix. The immunoreactivity was weaken.

• Journal of Korean Dental Science
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• 제7권2호
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• pp.66-79
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• 2014

Purpose: To analyze the amount and pattern of tooth movement and the changes in arch dimension of mandibular dentition after orthodontic treatment using a new three-dimensional (3D)-indirect superimposition method. Materials and Methods: The samples consisted of fifteen adult patients with class I bialveolar protrusion and minimal anterior crowding, treated by extraction of four first premolars with conventional sliding mechanics. After superimposition of 3D-virtual maxillary models before and after treatment using best-fit method, 3D-virtual mandibular model at each stage was placed into a common coordinate of superimposition using 3D-bite information, which resulted in 3D-indirect superimposition for mandibular dentition. The changes in mandibular dental and arch dimensional variables were measured with Rapidform 2006 (INUS Technology). Paired t-test was used for statistical analysis. Result: The anterior teeth moved backward, displaced laterally, and inclined lingually. The posterior teeth showed statistically significant contraction toward midsagittal plane. The amounts of backward movement of anterior teeth and forward movement of posterior teeth showed a ratio of 6 : 1. Although the inter-canine width increased slightly (0.8 mm, P<0.05), the inter-second premolar, inter-first molar, and inter-second molar widths decreased significantly with similar amounts (2.2 mm, P<0.05; 2.3 mm, P<0.01; 2.3 mm, P<0.001). The molar depth decreased (6.7 mm, P<0.001) but canine depth did not change. Conclusion: A new 3D-indirect superimposition of the mandibular dentitions using best-fit method and 3D-bite information can present a guideline for virtual treatment planning in terms of tooth position and arch dimension.