• 구강회복응용과학지
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• 제21권1호
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• pp.69-81
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• 2005

The objective of this study was to evaluate the toothbrush abrasion characteristics of class V restorations. Thirty extracted human premolars, which were collected from oral surgery clinics were used. We mounted five teeth in a metal ring mold of 50 mm in diameter and 15 mm in height using chemically cured acrylic resin. Class V cavities were prepared in lingual cervical root surfaces and restored using one of following restorative materials : Dentin Conditioner/Fuji II LC (Group FL), All Bond II/Z-250 (Group ZT), One-up Bond F/Palfigue Estelite (Group PE), F2000 Primer/Adhesive (Group FT), and Prime & Bond 2.1/Dyract AP (Group DR). They were stored under distilled water at $37^{\circ}C$ for seven days. The toothbrush abrasion test was conducted using a wear testing machine of pin-on disk type under a load of 1.5 N for 100,000 cycles. We have examined the bonded interfaces, the changes of surface roughness and color of abraded surfaces. From this experiment, the following results were obtained. 1. The change of surface roughness showed high degree: RMGIC>compomer>composite resin (p<0.05). 2. Because of the protrusion and missing of filler particles, SEM observation of abraded surfaces of RMGIC and compomers revealed the increase of surface roughness due to the selective removal of matrix resin. 3. The color change by toothbrush abrasion was affected in large part by the change of $L^*$ and $b^*$ of resin composites (p<0.05). 4. The color change by toothbrush abrasion was so small to detect by human eyes. 5. SEM observation of abraded surfaces revealed the interface bonding was the best in the FT group.

• 대한치과교정학회지
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• 제44권2호
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• pp.88-95
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• 2014

Objective: The purpose of this study was to compare the treatment duration and dentoskeletal changes between two different anchorage systems used to treat maxillary dentoalveolar protrusion and to examine the effectiveness of en-masse retraction using two miniscrews placed in the midpalatal suture. Methods: Fifty-seven patients (9 men, 48 women), who had undergone level anchorage system treatment at Aichi-Gakuin University Dental Hospital (Nagoya, Japan) were divided into two groups according to the method of maxillary posterior anchorage reinforcement: midpalatal miniscrews (25 patients, mean age 22 years) and conventional anchorage (32 patients, mean age 19 years). The en-masse retraction period, overall treatment duration, pre-treatment effective ANB angle, and change in the effective ANB angle were compared with an independent-samples t -test. Results: Compared to the headgear group, the duration of en-masse retraction was longer by approximately 4 months in the miniscrew group (p < 0.001). However, we found no significant difference in the total treatment duration between the groups. Moreover, a greater change in the effective ANB angle was observed in patients treated with miniscrews than in those treated with the conventional method (p < 0.05). Conclusions: The level anchorage system treatment using miniscrews placed in the midpalatal area will allow orthodontists more time to control the anterior teeth during en-masse retraction, without increasing the total treatment duration. Furthermore, it achieves better dentoskeletal control than does the conventional anchorage method, thereby improving the quality of the treatment results.

• The Journal of Advanced Prosthodontics
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• 제6권6호
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• pp.483-490
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• 2014

PURPOSE. The purpose of this study was to determine the average facial proportions and mandibular movement capacity of 316 first-year dental students who carefully recorded them on each other. MATERIALS AND METHODS. This early exacting clinical experience was closely supervised by the authors in Columbus, Ohio during 1969-70. Five vertical and six horizontal distances were measured on each subject's face. An ala-tragus line and an occlusal line were drawn on the left side of the face to determine if these two lines were parallel. Measurements of mandibular movements involved maximum normal and hinge opening at the incisors and maximum amounts of right, left lateral and protrusive excursions of the mandible. RESULTS. The ala width and distance between the tips of upper right and left canine cusps averaged (35.2 mm and 34.8 mm) but with very large individual variations. The distance between ala to occlusal plane lines was 29.9 mm at the tragus and 31.3 mm near the ala. The angle between orbitale and ala-tragus averaged 13.6 degrees. CONCLUSION. The upper lip length was the most variable and the distance between the pupils was the most stable of the eleven facial measurements. The ala-tragus line and the occlusal plane lines were for all practical purposes parallel. Maximum jaw opening averaged 51.2 mm which was 3.0 times larger than maximal hinge opening of 17.2 mm. The maximum right plus left side jaw excursions (9.2 and 9.4 mm) totaled 18.6 mm, 2.3 times more than the 8.0 mm mean maximum forward protrusion.

• 대한치과교정학회지
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• 제45권3호
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• pp.121-129
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• 2015

Objective: This study aimed to assess three-dimensional changes in the temporomandibular joint positions and mandibular dimensions after correction of dental factors restricting mandibular growth in patients with Class II division 1 or division 2 malocclusion in the pubertal growth period. Methods: This prospective clinical study included 14 patients each with Class II division 1 (group I) and Class II division 2 (group II) malocclusions. The quad-helix was used for maxillary expansion, while utility arches were used for intrusion (group I) or protrusion and intrusion (group II) of the maxillary incisors. After approximately 2 months of treatment, an adequate maxillary arch width and acceptable maxillary incisor inclination were obtained. The patients were followed for an average of 6 months. Intraoral and extraoral photographs, plaster models, and cone-beam computed tomography (CBCT) images were obtained before and after treatment. Lateral cephalometric and temporomandibular joint measurements were made from the CBCT images. Results: The mandibular dimensions increased in both groups, although mandibular positional changes were also found in group II. There were no differences in the condylar position within the mandibular fossa or the condylar dimensions. The mandibular fossa depth and condylar positions were symmetrical at treatment initiation and completion. Conclusions: Class II malocclusion can be partially corrected by achieving an ideal maxillary arch form, particularly in patients with Class II division 2 malocclusion. Restrictions of the mandible in the transverse or sagittal plane do not affect the temporomandibular joint positions in these patients because of the high adaptability of this joint.

• 대한소아치과학회지
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• 제24권4호
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• pp.795-804
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• 1997

Developmental dental morphological anomalies are fusion, gemination, twinning, concrescence and etc. They may cause many problems in conservative, periodontal and esthetic aspects. Fusion is a condition where two separate tooth buds unite at some stage in their development to form a bifid crown. If tooth contact occurs early, at least before the start of calcification, the two teeth may be completely unites to form a single large tooth. If tooth contact occurs after the time when a portion of the tooth crown has completed its formation, there may be union of the roots only. In fusion the dentin is always confluent. Fusion teeth is more common in the deciduous than in the permanent dentition. Fused teeth are relatively rare, and are mostly mandibular anterior teeth. Fusion of normal and supernumerary teeth or between normal teeth may occurs. The exact etiology factor of fusion is unknown, but genetic and environmental factors seems to be related. A variety of complications and subsequent treatments have been suggested on this teeth. Periodontal conditions may arise due to a groove formed at the line of fusion of the two teeth. Crowding or Protrusion with potential for malocclusion or delayed eruption of adjacent teeth. Fusion teeth appear in the anterior region, they usually cause esthetic problems. Treatments vary depending on the problem, the location, and the extent of fusion. Treatment of fused teeth has been reported from endodontic, orthodontic, periodontic, surgical and multidisciplinary. This report presents the esthetic improvements by separation of two clinical crowns. Bone reduction or endodontic treatments are not required.

• 구강회복응용과학지
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• 제39권3호
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• pp.119-132
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• 2023

치아 상실로 인한 구치부의 지지 상실은 전치부의 보상성 정출 및 순측경사 이동으로 이어질 가능성이 존재하고, 이에 따른 과개교합 및 교합수직고경의 감소를 동반할 수 있다. 환자는 저작효율의 감소와 더불어 부정확한 발음과 안모의 변화, 턱관절의 기능 장애를 겪을 가능성이 있으므로 구치부의 지지와 교합수직고경의 회복을 통해 안정적인 교합 형성의 필요성이 있다. 본 증례는 다수의 치아 상실로 인해 수직고경이 감소하여 부정확한 발음을 가진 환자를 대상으로 발음분석을 동반하여 수직고경을 증가시켜 완전 구강 회복술을 시행하였으며 기능적, 심미적으로 만족할 만한 결과를 얻었기에 보고하고자 한다.

• 대한심미치과학회지
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• 제32권2호
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• pp.36-45
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• 2023

심미적인 전치부의 모습은 자연스럽고 건강한 미소를 위한 필수요건이며 대인관계의 자신감을 위해서도 중요한 요소이다. 전치부의 총생이=나 전돌이 존재하는 경우 단기간에 해결하기 위해 근관치료 및 과도한 치아삭제가 요구되는 경우가 많다. 하지만 이런 술식은 지속가능한 심미적 결과를 만들기 어렵다. 이런 경우 교정치료가 병행되어야만 수복이 필요한 치아들도 잔존 치질을 최대한 보존할 수 있을 것이다. 중장년층 환자들의 경우 교정 치료의 필요성을 절감하면서도 사회적 시선을 의식하여 브라켓을 이용한 전통적 방식의 교정치료 방법을 주저하는 경우가 많다. 이런 경우 투명교정장치는 좋은 선택지가 될 수 있다. 이에 투명교정만으로 심미적 요구를 해결한 증례와, 투명교정을 동반한 새로운 수복치료를 통해 만족스러운 결과를 얻은 다른 증례를 보고한다.

• 대한치과교정학회지
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• 제31권2호통권85호
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• pp.283-300
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• 2001

본 연구는 부정교합 유형이나 지역 분포 및 시대적 변화 등을 파악하고 이해함으로써 환자의 적절한 의사소통을 위한 자료나 정보제공을 용이하게 하기 위해, 적절한 진단과 치료계획을 수립하는 데 도움을 주기 위해, 다가오는 21세기에 변모될 치의학을 준비하고 발전의 도약을 마련하기 위해, 향후 부정교합 치료의 방향성을 설정하기 위해 시행하였다. 이를 위해 1990년부터 1999년까지 10년간 조선대학교 부속치과병원 교정과에 내원하여 진단받은 부정교합 환자 중 진단용 모형과 진료기록부가 잘 보존된 3,070명을 대상으로 하여 부정교합의 양상과 내원환자의 분포 및 변화추세를 조사 연구한 결과 다음과 같은 결론을 얻었다. 1. 내원환자의 수는 매년 증가 추세에 있었으며, 남자가 43.5%, 여자가 56.5%로 여자가 남자보다 약 1.3배 더 많았다. 2. 연령별 분포에서 7세에서 12세 군의 내원율이 37.9%로 가장 높게 나타났으며 다음으로는 13세에서 18세 군이 32.0%, 19세에서 24세 군이 19.6%, 25세 이상 군이 7.1%, 0세에서 6세 군이 3.4%으로 가장 낮았다. 3. Hellman 치령별 분포에서 남녀 모두 영구치열의 완성기인 IVa가 54.9%로 가장 높게 나타났다. 4. 내원환자의 거주지 분포에서 광주시내 거주자가 내원환자의 71.0%로 10km이내가 56.3%, 20km이내가 14.7%였다. 5. 내원환자의 주소(chief complaint)별 분포에서 전치부 반대교합이 22.7%로 가장 높게 나타났으며, 하악전돌은 12.6%, 상악전치전돌은 12.2%를 보였다. 6. Angle씨 부정교합 분류별 분포에서 제I급 부정교합이 38.9%, 제 II급 1류 부정교합은 20.7%, 제 II급 2류 부정교합은2.0%, 제III급 부정교합은 38.4%였으며, 남자에서는 제III급 부정교합이, 여자에서는 제I급 부정교합의 비율이 가장 높게 나타났다. 7. 치아의 수직관계이상에 있어서 제II급 1류와 2류 부정교합에서는 과개교합이 24.3%와 56.7%로, 제III급 부정교합에서는 개교합이 21.4%로 가장 높게 나타났다. 8. 골격의 전후방적 부조화에 있어서 제II급 부정교합은 하악골 발육부전으로 인한 경우가 39.3%, 제III급 부정교합은 하악골 과다성장으로 인한 경우가 46.3%로 가장 높게 나타났다. 9. 교정치료시 발치유무에 따른 분포에 있어서 발치 치료는 33.1%, 비발치 치료는 66.9%를 차지하였고, 발치치료 중 38.6%가 상하악 좌우측 제1소구치를 발거하였다. 10. 악교정 수술환자는 매년 계속 증가 추세에 있었으며, 전체 환자의 7.9%가 악교정 수술을 받았다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제34권1호
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• pp.99-107
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• 2008

Objective : The objective of this review was to provide reliable comparative results regarding the effectiveness of any interventions either open or closed that can be used in the management of fractured mandibular condyle Patients and Methods : Research of studies from MEDLINE and Cochrane since 1990 was done. Controlled vocabulary terms were used. MeSH Terms were "Mandibular condyle" AND "Fractures, bone". Only comparative study were considered in this review using the "limit" function. According to the criteria, two review authors independently assessed the abstracts of studies resulting from the searches. The studies were divided according to some criteria, and following were measured: Ramus height, condyle sagittal displacement, condyle Towns's image displacement, Maximum open length, Protrusion & Lateral excursion, TMJ pain, Malocclusion, and TMJ disorder. Results : Many studies were analyzed to review the post-operative result of the two methods of treatment. Ramus height decreased more in when treated by closed reduction as opposed to open reduction. Sagittal condyle displacement was shown to be greater in closed reduction. Condyle Town's image condyle displacement had greater values in closed reduction. Maximum open length showed lower values in closed reduction. In protrusive and lateral movement, closed reduction was less than ORIF. Closed reduction showed greater occurrence of malocclusion than ORIF. However, post-operative pain and discomfort was greater in ORIF. Conclusion : In almost all categories, ORIF showed better results than CRIF. However, the use of the open reduction method should be considered due to the potential surgical morbidity and increased hospitalization time and cost. To these days, Endoscopic surgical techniques for ORIF (EORIF) are now in their infancy with the specific aims of eliminating concern for damage to the facial nerve and of reducing or eliminating facial scars. Before performing any types of treatment, patients must be understood of both of the treatment methods, and the best treatment method should be taken on permission.

• 대한장애인치과학회지
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• 제15권1호
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• pp.84-88
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• 2019

장애인의 교정 치료는 환자에 따라 치료 목표와 방법이 비장애인의 교정 치료와 달라질 수 있다. 교정 치료를 시작하기 전에 환자의 교정 치료의 한계에 대한 보호자와의 충분한 의사소통이 먼저 이루어져야 하고, 교정 치료는 환자가 견딜 수 있으면서 도움이 되는 방향으로 시행되어야 한다. 또한 교정치료 시 보호자들에게 구강위생관리의 중요성을 항상 강조하고 집에서의 구강 위생 관리를 위한 교육을 반드시 시행해야 한다.