Replacements for natural dentition must fulfil many criteria. An important aspect, especially for the patient, is aesthetic consideration. The shape and colour can be important factors in the aesthetic success of an anterior restoration. In order to allow for proper shape; the outline form, the spatial position of individual teeth and the surface characteristics must be considered. For the colour; translucency, value, chroma and hue must be expressed exactly. The dentist and technicians should catch up these very specific characteristics of the patient and convert them accurately to the restorations with the simplest way.

A tooth solely can not be an exclusive factor to attain our goal, esthetics. Other consideration, such a proportion of individual tooth, harmonized arrangement of the dentition and surrounding tissues including gingiva, lip and face should be taken into account. Esthetic gingival pattern and incisal level in the anterior area are the very important factors for esthetic restoration of the smile. We often propose adequate periodontal and prosthodontic approaches in order to improve the esthetics of the anterior area. Here, I would like to share some cases which include soft tissue management for ovate pontic placement, osteoplasty, resin filling for severe cervical caries, and bleaching approach to discolored root caused by endodontic treatment, and so on.

The preservation of a healthy periodontal attachment is the most significant factor in the long-term prognosis of a restored tooth. The 'Biologic Width' is composed of the connective tissue attachment and the epithelial attachment in the dentogingival junction. The violation of the biologic width may result in a progressive inflammatory process and crestal bone loss. So a careful soft tissue management is needed to preserve it for the gingival health and an esthetic restoration. The following clinical cases show the five different situations of the violation of the biologic width and their management.

No one really doubts that the hottest area of dentistry in 21st century would most likely be 'implant'. With the support of a vast amount of research, implant has been successfully and rapidly absorbed into the field of general dentistry including private practitioners. For teeth with hopeless(or refractory) periodontitis or periapical pathosis, with no hesitation most dentists would think extraction as the sole treatment option followed by prosthodontic replacement possibly including implant. Not many dentists would take Trasplantation/Replantation as another treatment option for a particular condition. Dentistry is often more focused on 'Restoration' than 'Preservation' of natural dentition. 'Biologic Implant' is obviously much closer to the concept of 'Preservation'. Many different types of biologic implant system have been introduced to clinical dentistry so far. Many of those have failed to earn reasonable acknowledgement despite of the clinical success they brought. For some reason biologic implant has rather been alienated for long time. RPI(Ring Pin Implant) is designed to improve the prognosis and success rate of transplanted/replanted teeth. RPI is a Ti-based custom made implant system. It is fabricated either by electric casting or milling process. The major feature RPI gas is the 'ring & hole' structure. The hole should be no less than 1mm diameter to allow bone bridge formation thru it. The ring structure and bone bridge formation creates anti-torque activity, which largely increases the 'initial stability' of the transplanted/replanted teeth. It is also reported that RPI is beneficial in the aspect of resisting root resorption following replantation/transplantation procedure.

A fixed bridge is preferred as a prosthetic option supported by oral implants. However, it is very difficult to re tore edentulous maxilla with fixed prosthesis in cases with improper position and angulation of fixtures, abnormal jaw relation, and need for proper lip support. Six Br${\aa}$nemark implants were installed in edentulous maxilla opposing mandible with natural dentition. A removable hybrid prosthesis attached to a bar milled by 6 degrees was therefore designed to overcome such disadvantages of fixed prosthesis. Lateral stabilization of removable prosthesis was obtained by framework closely fitting the milled bar. Support for the prosthesis was ensured by three elevated areas on the bar. Two precision attachments(CEKA REVAX) provided appropriate direct and indirect retention without influencing support. A clinical and laboratory procedure was presented.

Dental clinicians commonly encounter extrusion of the anterior teeth due to localized alveolar bone loss in adult patients with chronic periodontitis. This pathologic migration of the anterior not only may cause loss of functional anterior guidance and continuous periodontal destruction, but also can lead to esthetic disaster. In fact, most frequently reported chief complaint of the patients with extruded anterior teeth is the 'loss of esthetics', not the periodontal problem itself. The utilization of the expertise and skills in the various dental disciplines is thought to be the best treatment modality for the ultimate functional and esthetic attainment. Interdisciplinary therapy, involving periodontics, orthodontics, and restorative dentistry, was performed for the highest levels of patient and provider satisfaction in this case.

The use of fluoride and other preventive methods caused a dramatic decline in dental caries and the need for restorative dentistry. In our modern society that places a high value on appearance, emphasis is now shifting towards esthetic dentistry which has experienced a high popularity with the development of bonding techniques and materials including porcelain and composite. To satisfy patients wanting whiter teeth and a better looking smile, there are many treatment options ranging from full crown coverage to conservative procedures such as bleaching. Whether bleaching should be combined with other esthetic procedures or used alone depends on the type of discoloration and the patient's willingness to accept the various treatment options. Therefore, in order to obtain a successful esthetic outcome, careful diagnosis and treatment planning followed by consultation with the patient is of utmost importance.

Zinc phosphate cement has long been the material of choice for permanent luting of cast restorations, and through many years of use has been considered effective to retain castings. However, cast restorations cemented with this material have been susceptible to secondary caries. Glass ionomer luting agents become available in the late 1970s. These material s, through release of fluoride, show considerable promise as a means of reducing secondary caries. Other favorable traits include significantly less disintegration in vivo than zinc phosphate cements, a film thickness comparable to that of zinc phosphate cement, and adhesion to tooth structure. Compomer materials were created in 1993 as a filling material for deciduous teeth, cervical lesions, and class III cavities. In the meantime, compomer have been developed as chemical hardening cements for cast gold restorations. The aim of this paper is to review the articles on luting cements to help the choice of dental cements.

These days, Dental Technic has been contributed to make more delicating Dental Prosthesis Restoration for patient and dentist. Diagnostic wax-up and making Temporary Crown are emphasized as an important part of Dental Technic. Choosing suitable Material and working with various new Equipments like Microscope improve accuracy. Repeated practice by setting up an organized system gives better result. Also, Esthetic Prosthesis requires patient's appearance and personality as well as patient' age, sex, and shade so on. Moreover, the problem which occurs by the patient's oral condition ha to be discussed before taking final impression. At a time like this, Scientific-mind and Logical thought Ability should be considered the important issue for more progressive Dental Technic.

Although various kinds of porcelain restorations, including full porcelain jacked crowns and laminate crowns, are used for Esthetic Dentistry nowadays, the most widely used one so far is porcelain metal restoration. It goes without saying that shade matching in porcelain-metal restoration is much more difficult than in full ceramic veneer restoration because of the metal substructure limitation of the porcelain to metal restoration and then let it go even when shade matching is a little bit unsatisfactory. I think a more satisfactory shade matching can be achieved by developing more elaborate techniques, by selecting proper metal and porcelain and by enabling more detailed communication between the dentists and the dental technicians. Some considerations will be made in an attempt to achieve more successful outputs.

임플란트 술식을 이용하여 소실된 구강조직을 수복하는 방법은 보철적 수복 술식중 중요한 부분을 차지하고 있다. 구강수복의 목적은 손상된 구강조직의 기능성, 심미, 발음 등을 회복하는 데 있다. 최근 환자, 치과의사, 기공사들의 심미성에 대한 요구가 증가하는 추세이므로 임플란트 보철수복의 자연미에 대한 관심 또한 고조되고 있다. 최종 보철물의 심미적인 결과에는 형태, 색조, 비율, 잇몸의 형태 등등의 많은 요소가 관여한다. 자연감과 생동감이 있는 인공보철물을 환자에게 제공해 주기 위하여 주의 깊은 진단 및 치료계획과 이를 뒷받침하는 기공사의 역할이 필수적이다. 자연감 있게 보이는 임플란트 보철물을 제공하기 위하여 재료, 잇몸의 재현, 형태 및 발음, 보철물의 design 등에 관하여 screw type, cement type, 그리고 overdentuure 등의 몇 가지 증례를 통하여 살펴보고자 한다.

최근 임플란트에 대한 관심이 날로 증가되는 추세이다. 기능적이나 심미적으로 다른 보철물의 단점을 보완해줄수 있기에 환자들의 만족도가 커지고 있다. 임프란트의 성공을 위해서는 적절한 환자의 선택, 치료계획, 정확한 수술 및 보철물제작과 치료후의 유지관리술식이 필수적이다. 그 중에서 치료후의 유지관리를 어떻게 하는가가 임프란트의 수명에 크게 영향을 미치므로 본 저자는 임프란트의 실패원인의 한가지로 implant와 치주질환의 관계를 간단히 살펴 보려한다.