근막동통으로 인한 하악 구치부 연관통의 임상증례

강진규,Kang, Jin-Kyu 대한안면통증구강내과학회 2007 Journal of Oral Medicine and Pain Vol.32 No.4

Majority of toothache is caused by abnormality of pulpal or periodontal tissues. However, there are numerous nonodontogenic sources that may be responsible for pain felt in the tooth. Nonodontogenic toothache may result from muscle, maxillary sinus, neuropathic, neurovascular, even cardiac and psychogenic problems. Myofascial pain is one of the most common abnormality characterized by palpation of a hard band which acts as the trigger point that causes stiffness and fatigue of the muscle, referral pain in tooth, tension-type headache, and hyperalgesia. Masseter muscle particularly induce referral pain in maxillary and mandibular molars. This case reported the treatment of the pain in right mandibular molar originated from myofascial pain of the right masseter. The pain is improved by general and reversible treatments such as muscle exercise, physical therapy, and medication. Nonodontogenic toothache should undergo proper differential diagnosis in order to avoid unnecessary dental treatments, such as endodontic, periodontic treatment, and tooth extraction, which would fail to alleviate the symptom of the patient.

Association between Sleep Quality and Psychologic Factors among University Students in Korea

강진규,임현대,이유미,Kang, Jin-Kyu,Lim, Hyun-Dae,Lee, You-Mee Korean Academy of Orofacial Pain and Oral Medicine 2008 Journal of Oral Medicine and Pain Vol.33 No.3

The mentophysical disease causes diseases in digestive, respiratory, circulating systems, including chronic pain, through combined reactions from different individual characteristics, mental stress and temperamental factors. The most common symptom related to orofacial area is pain and the contributive factors include biological, behavioral, environmental, social, emotional, recognitive factors. These factors affect the course of the symptom according to individual's character and human nature. In pain, sleep acts as a contributive factor, and pain could bring about sleep disturbance and vice versa. Deterioration of sleep quality would act as a factor that aggravates mental stress. Therefore, relatively accurate and simple mental examinations and sleep quality test should be carried out for the patients with symptoms related to orofacial area. This study evaluated the mental state in relation to the sleep quality which could affect orofacial pain. The number of poor sleeper was 18 in male subjects, and 1 in female subjects and PSQI global index was higher in male($6.11{\pm}2.38$) than female($4.67{\pm}2.18$). SCL-90-R index showed no sex difference. Poor sleeper showed significantly high value in SOM, O-C, I-S, ANX, PHOB, PSY, GSI, PST. When SCL-90-R T scores were compared according to sleep quality, higher the subjective sleep quality score, O-C and I-S showed significant increase. As sleep disturbances score increased, PAR, PSY, PST showed statistically significant increase. In comparison of SCL-90-R T score according to daytime dysfunction, statistically significant increase in DEP, ANX, HOS, PHOB, PAR, GSI was observed. Therefore, the quality of sleep and psychological status have a high correlation. This is likely to influence chronic pain in the orofacial field. As a result, clinicians treating orofacial pain should evaluate the sleep quality and psychological status of the patient. Further studies of larger sample sizes including various age, occupation, and pain groups are necessary in order to apply the results to clinical practice.

마이크로파 소결법을 이용한 Bi_0.5Na_0.5TiO₃계 적층형 세라믹 액추에이터 제조

강진규,이재신,Kang, Jin-Kyu,Lee, Jae-Shin 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.11

A comparative study has been attempted for microwave and conventional sintering of lead-free $Bi_{0.5}Na_{0.5}TiO_3(BNT)$-based multilayer ceramic actuators(MLAs). It was found that microwave sintering (MWS) could be successfully applied to the co-firing of piezoceramic/AgPd MLAs with a 10 times shorter firing cycle as well as $100^{\circ}C$ lower firing temperature ($850^{\circ}C$) for sufficient densification than conventional furnace sintering ($950^{\circ}C$). Furthermore, MWS-derived specimens showed better electric field-induced strain than that of CFS-derived specimens by effectively suppressing interdiffusions between ceramic and electrode layers.

구개에 발생한 혈관성 평활근종의 보고

강진규,윤정훈,심영주,Kang, Jin-Kyu,Yoon, Jung-Hoon,Shim, Young-Joo 대한안면통증구강내과학회 2013 Journal of Oral Medicine and Pain Vol.38 No.2

평활근종(leiomyoma)은 평활근에서 발생하는 양성종양으로, 두경부 영역에서는 흔치 않은 질환이다. 구강내 평활근종의 경우 혈관성 평활근종이 가장 흔하다. 구강내 혈관성 평활근종은 비교적 단단하고, 매끈한 표면을 가지며, 경계가 명확하고, 둥글고 돌출되어 있다. 대부분 무통성으로 느리게 성장하기 때문에 환자가 병원을 찾게 될 때까지 수개월에서 수년이 걸리며, 병력 및 임상검사, 방사선학적으로 특징적인 소견을 나타내지 않아 수술 후 병리조직학적 소견으로만 진단이 가능하다. 본 증례는 구개부에 연성종양을 주소로 내원한 53세의 여자 환자에서 종양 적출술을 시행, 병리조직학적으로 혈관성 평활근종으로 확진된 1예를 문헌고찰과 함께 보고한다. Leiomyoma is benign neoplasm of smooth muscle, but it is rare in the oral cavity. The most common type of leiomyoma in the oral cavity is vascular leiomyoma. Clinically, vascular leiomyoma usually grows slowly and is generally a small, painless, sessile, firm and superficial nodule like lesion, and the length of time before patients seek medical attention may span months to years. The diagnosis of oral leiomyoma is possible with only histological studies with special stains because there are no specific clinical and radiological signs. We experienced a 53-year-old woman with palatal mass. She underwent surgical excision and the final pathological result confirmed it to be vascular leiomyoma. We report this case with a review of the related literatures.

구강안면통증 환자에서의 두통 양상의 분류

강진규,유지원,김성택,최종훈,Kang, Jin-Kyu,Ryu, Ji-Won,Kim, Seong-Taek,Choi, Jong-Hoon 대한안면통증구강내과학회 2006 Journal of Oral Medicine and Pain Vol.31 No.4

Headache is a common disease which influences not only individually but also socially. Temporomandibular disorders(TMD) refers to pain and dysfunction within the temporomandibular joint(TMJ) and associated muscles. TMD is presented commonly, and 70% of population are found to have one or more related symptom. A number of studies have been conducted to verify the association between headache and TMD, and some authors have proposed that headache and TMD may be related. In this study, we studied the patterns of headache presented by the patients who visited the TMJ and Orofacial pain clinic. Among the patients participated in this study, tension type headache showed the highest prevalence(48.5%), followed by migraine without aura(15.0%), probable migraine(10.6%), migraine with aura(7.1%), probable tension type headache(4.8%), and other primary headaches(1.8%). The high prevalence of tension type headache may be due to the accompaniment of orofacial pain by pericranial muscle tenderness. Comparison of sex showed that the rate of migraine was higher in female than male(female to male ratio 35.8:25.3). In age analysis, the rate of migraine was high in the twenties(42.2%) and the thirties(40.0%). As the age increased, the rate of migraine decreased, and this trend was in accordance with the previous studies. The percentage of the patients who had previously received treatment was only 26.2%, and that of those who were aware of the diagnosis was merely 8.7%. Therefore, it is not common for headache patients to get treatment, however, since orofacial pain is often accompanied by headache, more systematic diagnosis as well as precise treatment would be necessary. Moreover, since TMD could induce and aggravate headache, proper evaluation and management of TMD would be essential for diagnosis and treatment of headache. In the future, more systematic and broad investigation on the influence of causative factors of TMD on headache as well as the change in headache pattern with the treatment of TMD would be required.

Bi_0.5(Na_0.82K_0.18)_0.5TiO₃ 세라믹스의 소결거동 및 압전 특성에 대한 과잉의 CuO 첨가 효과

강진규,장현덕,허대준,이현영,안경관,이재신,Kang, Jin-Kyu,Jang, Hyun-Deok,Heo, Dae-Jun,Lee, Hyun-Young,Ahn, Kyoung-Kwan,Lee, Jae-Shin 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.6

We investigated the effect of excess CuO on the sintering behavior, ferroelectric, and piezoelectric properties of lead-free $Bi_{0.5}(Na_{0.82}K_{0.18})_{0.5}TiO_3$ (BNKT) ceramics. The addition of excess CuO was found to greatly contribute to the densification and grain growth, however, excess CuO over 3 mol% was precipitated at grain boundaries after sintering. BNKT with 1~2 mol% CuO in excess sintered at $975^{\circ}C$ showed piezoelectric properties comparable to those of unmodified BNKT sintered at $1,175^{\circ}C$. These results seem meaningful for its application to low cost multilayer actuators (MLAs) because low firing ceramics make it possible to apply less expensive base metals to the inner electrode of MLAs.

(K_0.5Na_0.5)NbO₃ 세라믹스의 압전 특성에 대한 Ta 도핑 효과

강진규,이용희,허대준,이현영,딘치힌,이재신,Kang, Jin-Kyu,Lee, Yong-Hui,Heo, Dae-Jun,Lee, Hyun-Young,Dinh, Thi Hinh,Lee, Jae-Shin 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.5

We investigated the effect of Ta doping on the dielectric and piezoelectric properties of lead-free $(K_{0.5}Na_{0.5})NbO_3$ ceramics prepared using a conventional ceramic processing. X-ray diffraction analysis revealed that Ta was perfectly substituted into Nb-sites in the range of 0 to 20 at%. As Ta content in the KNN increased, the sinterability of KNN ceramics was significantly degraded while the Ta doping enhanced the piezoelectric constant $d_{33}$, planar mode piezoelectric coupling coefficient ($k_p$), and electromechanical quality factor ($Q_m$). The highest values for $d_{33}$, $k_p$, and $Q_m$ was found to be 156 pC/N, 0.37, and 155, respectively.

염료 회분실험을 통한 MCM-41의 흡착 특성 분석

강진규 ( Jin-kyu Kang ),이창구 ( Chang-gu Lee ),김재현 ( Jae-hyun Kim ),윤서영 ( Seo-young Yoon ),손정우 ( Jeong-woo Son ),김성배 ( Song-bae Kim ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-

본 연구에서는 메조다공성 실리카인 MCM-41의 흡착제로서의 가능성을 평가하기 위하여 염료회분실험을 수행하였다. 합성한 MCM-41의 흡착특성에 이용한 염료는 양이온성 염료인 Methylene Blue와 음이온성 염료인 Acid Blue 25이다. 두 염료를 대상으로 흡착특성을 평가하기 위해 동적회분실험, 등온 평형 회분실험, pH별 회분실험, 열역학적 회분실험을 수행하였다. 실험결과, 등온 평형 회분실험의 결과는 Redlich-Peterson 모델로 잘 설명되며 methylene blue의 경우 K_RP와 α_RP는 각각 4.00E+7 L/g, 8.00E+6 L/mg으로 나타났으며 β는 0.51로 나타났다. acid blue 25의 경우 K_RP와 α_RP는 각각 1.35E+2 L/g, 3.62E+3 L/mg으로 나타났으며 β는 0.27로 나타났다. 동적 회분실험결과, Pseudo-first order 모델로 잘 설명되며, methylene blue의 경우 최대 흡착량은 47.96 mg/g으로 나타났으며 k₁은 27.48 h^-1의 값을 보였다. acid blue 25의 경우 최대 흡착량은 1.13 mg/g으로 나타났으며 k1은 27.66 h^-1의 값을 보였다. pH 별 회분실험 결과 Methylene blue의 경우 pH가 증가함에 따라 흡착량이 증진되었으며, acid blue를 대상으로 진행한 실험상에서는 흡착량에 큰 변화가 없었다. 이러한 결과들은 MCM-41의 표면이 부분적으로 음전하를 띠기 때문에 양이온성 염료인 methylene blue와의 정전기적 인력에 의해 흡착이 발생하기 때문으로 보인다. 또한 pH에 따른 경향은 pH가 올라갈수록 MCM-41의 표면이 탈양성자화 작용에 의하여 methylene blue와의 정전기적 인력이 심화됨에 의한 것으로 보인다. 열역학적 회분실험 결과, 염료에 관계없이 온도가 증가함에 따라 MCM-41의 흡착능은 감소하여 MCM-41의 염료 흡착반응이 발열반응인 것으로 보인다.

매몰지 토양에서 Staphylococcus aureus의 거동

강진규 ( Jin-kyu Kang ),박정안 ( Jeong-ann Park ),윤서영 ( Seo-young Yoon ),김태훈 ( Tae-hun Kim ),유승호 ( Seungho Yu ),김성배 ( Song-bae Kim ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-

본 연구에서는 포화된 매몰지 토양에서의 미생물 운송을 평가하기 위하여 매몰지 토양으로 충진된 칼럼에서 Staphylococcus aureus (ATCC 10537)의 거동 특성을 평가하여 보았다. 이를 위해 매몰지 토양 충진칼럼을 증류수로 포화 후 하향흐름으로 Cl-를 주입하여 토양 특성에 따른 거동 특성을 평가하였다. 또한 동일한 칼럼에 S. aureus를 일정농도로 15분간 하향흐름으로 주입 후 유출수에서의 S. aureus 농도 변화를 측정하였다. 유출수에서의 S. aureus 농도 파과곡선은 1기의 비평형 흡착지점을 고려한 일차원 운송방정식을 바탕으로 평가하여보았다. 분석결과 매몰지 토양에 의한 특성값인 포화수리전도도는 0.0077 cm/min, 종분산지수는 1.19 cm으로 나타났다. 1기 비평형 흡착지점 모델을 통한 분석결과, 1차 흡착계수는 1.30E-2 min^-1, 1차 탈착계수는 6.30E-4 min^-1으로 나타났다. 이러한 결과를 바탕으로 매몰지 토양에서의 미생물 저감을 위한 모델링에 활용할 수 있을 것으로 기대된다.

슬래그 혼합 토양에서 박테리아 제거

강진규 ( Jin-kyu Kang ),이창구 ( Chang-gu Lee ),윤서영 ( Seo-young Yoon ),김성배 ( Song-bae Kim ) 한국농공학회 2012 한국농공학회 학술대회초록집 Vol.2012 No.-

슬래그 등의 골재가 혼합된 매질체를 이용한 영양물질 흡착능에 대한 연구들은 많이 진행된데 반하여 미생물의 제거특성에 대한 연구는 부족하다. 따라서 본 연구에서는 슬래그 혼합 토양의 미생물 제거 특성을 평가하기 위하여 매몰지현장토양 (토성: 롬, d50: 76 μm, 양이온치환용량: 7.17 cmolc/kg, Fe: 43067 mg/kg, Al: 23370 mg/kg)에 슬래그 (#30× #40)를 0%, 50% 부피비로 칼럼에 충진하여 Escherichia coli (ATCC 11105) 제거실험을 진행하였다. 도출된 파과곡선은 Hydrus-1D를 이용하여 분석하였다. 실험 결과, 매몰지 현장토양만을 충진한 칼럼의 경우 보존성 추적자 Cl-를 이용한 흐름특성은 1차원 운송방정식에 근사한 결과 공극유속은 0.2483 cm/min, 수리분산계수는 0.399 cm²/min (R²=0.947), 질량회수율은 96%로 나타났다. 이러한 결과를 바탕으로 E.coli 흡착특성을 1기의 비평형 흡착지점을 가지는 1차원 운송방정식을 이용하여 근사한 결과, 1기 흡착상수는 1.59E-2 min^-1, 탈착상수는 1.81E-3 min^-1 (R²=0.927), 질량회수율은 50%로 나타났다. 이에 비하여 슬래그를 50%의 부피비로 혼합한 경우 Cl^-를 이용한 흐름특성 근사결과 공극유속은 0.2845 cm/min, 수리분산계수는 0.193cm²/min (R²=0.988), 질량회수율은 102%로 나타났다. 이러한 결과와 매몰지 토양의 1기의 흡·탈착 상수를 토양의 고유 값으로 보고 2기의 비평형 흡착지점을 가지는 1차원 운송방정식에서 E.coli 파과곡선을 바탕으로 2기의 흡탈착상수를 근사한 결과 2기 흡착상수는 1.33E-3 min^-1, 탈착상수는 3.68E-7 min^-1(R²=0.936), 질량회수율 47%로 나타났다. 결론적으로 슬래그 혼합에 따라 미생물의 질량회수율이 감소하여 제거능이 증진됨을 알 수 있었다.