28^th Asia Pacific Congress on Dental and Oral Health July 10-12, 2017 Kuala Lumpur, Malaysia

Mhammad SALEH has graduated at the age of 26 years from Near East University faculty of dentistry and has started the PhD program in the Department ofrnProsthetic Dentistry in the same university in September of 2015.

Restorations over implant can be secured to implants with two main methods screw retained restorations and cementrnretained restorations. Purpose: To assess the advantages and reported complications of both retaining techniques ofrnimplant supported restorations. Materials and Methods: A Medline (PubMed), science direct, and Google scholar electronicrndatabase search from 2002 to January 2017 was reviewed. 105 studies were first reviewed by abstract and subsequently byrnfull-text reading. Results: The literature discuss the advantages and disadvantages of each method of retention from differentrnaspects. The cement retained restorations show better passiveness and stability where is the cement is flowable to fill the leakages. Absence of screw access hole in the cemented restoration enhance the durability, fracture resistance and balancedrnocclusion. On the other, hand the screw retained restorations provide easy access and ability to remove restoration without anyrndamage to the abutment, implant or to the preri-implant tissue. Th e absence of remaining cement around the implant preventrnthe bacterial accumulation which lead to periimplantitis. Conclusions: Since the choice of using either method of retention is still controversial. The review demonstrated that each method of retention has certain advantages and disadvantages; however, there are some clinical situations in which it is better to select one method of retention rather than the other.

Laila Azzahim has completed her Dental studies at the Faculty of Dentistry of Rabat in Morocco. She holds a university degree in Biostatistics and Methodology of\r\nClinical Research and a Post-graduate Certificate in Conservative Odontology and Endodontics. She currently resides in the Department of Conservative Dentistry\r\nand Endodontics at the Ibn Sina University Hospital Center in Rabat, Morocco.

This e-poster presents non-surgical procedures to treat extensive cyst-like peri-apical lesions of endodontic origin. Six cases of cyst-like peri-apical lesions involving 6 teeth from 6 patients were selected. The symptoms described by the patients varied from a simple discomfort, a cutaneous fistula or even a circumscribed acute cellulitis. Radiographic diameters of the lesions ranged from 5.5 mm to 22 mm. Non-surgical procedures were performed by chemo-mechanical root canal preparation.\r\nWe placed intracanal calcium hydroxide dressing which were periodically replaced during 2 to 6 months. The root canals were\r\nthen filled with gutta percha by cold lateral condensation technique. Th e follow-up periods ranged from 6 to 24 months. We\r\nreported good bone healing. Thus, non-surgical treatment of these extensive cyst-like peri-apical lesions provided favorable\r\nclinical and radiographic response.

Ouqba Ghajghouj has graduated at the age of 23 years from Kalamoon University faculty of dentistry and started the PhD program in the Department of Prosthetic\r\nDentistry in Near East University in September of 2015.

We use different types of prosthetic restorations such as amalgam, composite, post-core and endocrown restorations to support endodontically treated teeth. The aim of endocrown restorations is maintaining the tooth which we can\'t prepare for it a single crown or post core restoration. Endocrowns assemble the intraradicular post, the core and the crown in\r\none component, thus representing monoblock restorations. Diff erent from conventional approaches using intraradicular post,\r\nendocrown restorations are anchored to the internal portion of the pulp chamber on the cavity margins, thereby resulting in\r\nboth macro- and micro-mechanical retention, provided by the pulp walls and adhesive cementation. Materials and Methods: A\r\nMedline (PubMed), science direct, and Google scholar electronic database search from 1999 to December 2016 was reviewed.\r\n70 studies were fi rst reviewed by abstract and subsequently by full-text reading. Results: Th e literature discuss the advantages\r\nand disadvantages of endocrown restorations. In a study of 3D Finite Element Analysis of molars restored with endocrowns\r\nand posts during masticatory simulation, teeth restored by endocrowns were potentially more resistant to failure than those\r\nwith fi ber reinforced posts. Endocrowns have been used as an alternative to conventional post-core and fi xed partial dentures\r\nin restoration of endodontically treated teeth with extensive coronal tissue loss. Compared to conventional methods, good\r\naesthetics, better mechanical performance, less cost and short clinic time are the advantages of endocrowns. Clinical studies\r\nhave shown that the endocrown has functional longevity, and has become a promising alternative in the esthetic and functional\r\nrecovery of endodontically treated teeth.

Mohammed Abujalala has graduated at the age of 23 years from Saini University faculty of dentistry and has started the PhD program in the department of prosthetic dentistry in the NEAR EAST university in September of 2015. He has finished his first seminar (Lazer Sintering) in February 2017, and the second seminar (Dental Photography) in June 2017.

Recently, rapid prototyping technology is the future of quick and direct production. This technology found applications with metal framework of fixed partial dentures, framework of removable partial dentures, facial protheses and titanium implants in prosthetic dentistry. Laser beam sintered the selected areas on the alloy powders and the restoration is produced layer by layer at single stage. Purpose: This literatures compared the internal fit, accuracy, bond strength, marginal adaptations, connection between the veneer porcelain, fracture strength marginal and internal gaps of laser-sinterd dental prosthesis with conventional casting techniques. Materials and methods: PubMed and Google scholar electronic database search from 2007 to January 2017 was reviewed. 103 studies were first reviewed by abstract and subsequently by full-text reading. Results: The literature discuss the advantages and disadvantages of laser sintering method from different aspects.They found that internal fit, marginal adaptations, Accuracy of laser-sintered metal restoration are better than that obtained with the traditional casting techniques. In another hand, no difference was observed in the study of internal adaptations, connection between the veneer porcelain, internal gap and porcelain surface treatments between laser sinterd and conventional casted metal restoration. Immediate implant loading could be achieved in a reasonable operative time. Conclusions: Laser sintering seems to be an alternative technique to conventional casting of dental alloys. Complex shapes from metal alloys can easily be produced With these devices. These systems can be helpful to obtained fixed restorations, facial prostheses, titanium implants, surgical models and stents. The new laser-sintering technique appears promising for dental application, but additional studies of properties of laser sintered.

M.Wafa RICHI has graduated at the age of 23 years from Aleppo University Faculty of Dentistry and has started the PhD program in the Department of Prosthetic Dentistry in Near East university in September of 2015.

Monolithic zirconia restorations have been developed to overcome the adhesion problem between the veneering ceramic and zirconia core and gain popularity in the last few years. The aim of this study is to review and discuss the literature regarding the optical properties of monolithic zirconia. Materials and Methods: A Medline (PubMed), Google scholar electronic database search, and science direct from 1985 to December 2016 was reviewed 95 were first reviewed by abstract and subsequently by full-text reading. Result: Monolithic zirconia is indicated in the posterior regions due to its high fracture strength, requires conservative tooth preparation, does not wear the antagonist enamel and can be successfully used for implant supported restorations. The light transmission through monolithic zirconia is improved in comparison to conventional zirconia core material. Conclusions: With its high fracture resistance, monolithic zirconia is becoming a preferred material because it can be used in the posterior region, can be used for conservative tooth preparation, does not cause contrary dental wear. The degree of translucency of monolithic zirconia is not comparable to that of glass ceramics, although it has been improved relative to conventional zirconia. For these reasons, more clinical investigations and long-term follow-up studies are required for the routine clinical use of monolithic zirconia, and optical properties must be improved in order to be used in the anterior region.