Missing tooth incidence is mainly caused by caries and periodontal problem. [1,2] Tooth loss might lead to various consequences including compromised chewing function, pain, poor phonation, and dissatisfaction with the appearance. Subsequently, it worsens the general health and quality of life. [2,3] Therefore, there is an increase in demand of tooth replacement using various prosthodontic treatment options. [4] Nowadays, many patients have reported improvement in their general satisfaction and quality of life, after receiving treatment for missing teeth replacement using fixed partial dentures. [5] The available treatment options include implant-supported restoration, conventional bridge, resin-bonded bridge (RBB), and fiber-reinforced composite resin bridge. [6,7] When comparing the above treatment options, there are a few patient and clinical factors that might need to be taken into consideration including treatment fees, longevity of the prostheses, esthetics, functions, risks, and complications of the treatment. [8] In recent years, patient satisfaction is essential while assessing treatment success in dentistry. Patients' satisfaction is correlated directly with the oral care provided to patients. [9] Using questionnaire to evaluate the patients' satisfaction, most studies reported generally a high patients' satisfaction following implant therapy. [9][10][11] With regard to the missing tooth replacement using fixed prosthesis, there are some studies reported high patients' satisfaction after the treatments provided. [5,12] A study done by Creugers et al. stated that overall satisfaction regarding RBBs was significantly correlated with "color"

Restoring the patient's missing dentition secondary to partial mandibulectomy of KCOT is important to improve function and aesthetics. The patient presented with a significant loss of alveolar bone which makes the fabrication of rehabilitation prosthesis a significant challenge. A neutral-zone impression technique is helpful in determining the exact space to be restored without compromising aesthetics and it avoids functional muscle displacement that may displace the prosthesis. This article describes the neutral zone impression technique to record a patient's functional muscular movement in guiding the setting of acrylic teeth and denture flange in the neutral zone area. This technique is very useful for postsurgical cases with significant loss of alveolar bone.

BACKGROUND Nowadays, the use of computer aided design / computer aided manufacturing (CAD / CAM) in fabricating indirect restoration such as onlay, crown and bridge has increased tremendously. However, there is lack of clinical information and evidence on current material and fabrication techniques of CAD / CAM post and core. This paper describes the classification of the post and core system and review current perspectives on recent development of CAD / CAM post and core. An electronic search of the literature was performed via PubMed and Scopus database, using the keyword (post and core) and (CAD / CAM) and (CAD / CAM post and core) as MeSH term. Articles eligible for inclusion in the present review were published in English, journal article and dated from January 2000 until November 2020. A total of 31 publications consisting of 18 in-vitro studies, 7 case reports, 4 finite element analysis and 2 clinical techniques were included in this review. Analysis parameters included are options of chairside CAD / CAM materials, CAD / CAM system and milling machine used, advantages and disadvantages and future direction of CAD / CAM post and core. CAD /CAM post and core can be alternative option as compared to the custom-made post and core and prefabricated post and core. KEY WORDS Computer - Aided Design, Computer - Aided Manufacturing, Dental Material, Indirect Restoration, Post and Core

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