Please activate JavaScript!
Please install Adobe Flash Player, click here for download

CAD/CAM international magazine of digital dentistry No. 4, 2016

fracture resistance of restorations study | 15 CAD/CAM 4 2016 cedural aspects, would also be an ideal extension of the research. Further studies should isolate vari- ables and establish a greater sample size. With advances in technology, the digital workflow ofrecords,designandoutputcouldbeeasilyimple- mented for pin-retained restorations. It has been previously shown that digital impressions have the ability to capture all aspects of a pin-augmented substructures (Fig. 12).14 It has also been demon- stratedthatCAD/CAMtechnologyhastheprecision and accuracy to mill (Fig. 13) the subsequent pin- boredrestorationfromane.maxCADblock.14 Adig- ital approach seems to represent a simple and pre- dictable chair-side alternative for the clinician. Conclusions This study explored combining retentive titanium pins with indirect e.max press onlay restorations in extracted human molar teeth. Teeth were then subjectedtoaxialloadinginauniversalloadingma- chine.Therewasnostatisticaldifferenceinfracture resistance between the two groups. However, the highest fracture resistance was displayed from a pin-retained e.max onlay. This may be related to the increased surface area and subsequent bond strength. Observationally, pin-retained e.max on- lays fractured in a manner that seemed more con- trolled than non pin-retained onlays. Digital dentistry could simplify this potential alter- native by providing the clinician with the tools required to acquire the digital impression, design and fabricate the final restoration. Although pin- retained was termed for the investigative restora- tions, perhaps pin-reinforced would seem more logical. Further investigations are required to sub- stantiatetheresearchandidentifywhetherthisap- proach may be considered as a clinical alternative. Conflict of Interest Research was supported by the Schulich Dentistry Summer Research Project and by Research Driven Inc. Les Kalman is the co-owner and President of Research Driven Inc. Acknowledgements TheauthorsthankVictoriaYu,adentalsummerstu- dent,whoassistedwithaspectsofthemethodology, and Dr. Amin Rizkalla, BSc, MEng, PhD, Associate Professor & Chair of the Division of Biomaterials Science, who facilitated the testing._ Editorial note: A complete list of references is available fromthepublisher. Fig. 11: Fracture resistance averaged for each group with standard deviation: graphical. Fig. 12: Digital impression of a pin-augmented substructure. Fig. 13: Milled e.max restoration with pin-bore holes. about Dr Les Kalman, DDS – Assistant Professor, Department of Restorative Dentistry, Schulich School of Medicine and Dentistry; and Chair of Dental Outreach Community Service program, Western University, London, Ontario, Canada. Yasmin Joseph, BSc – Undergraduate Student, Faculty of Science, Western University, London, Ontario, Canada. contact Dr Les Kalman Dental Science Building, Room 0142Q Schulich School of Medicine and Dentistry, Western University 1465 Richmond St London, ON N6A 5C1, Canada ljkalman@icloud.com Fig. 11 Fig. 12 Fig. 13 42016

Pages Overview