Journal of Osseointegration Journal of Osseointegration en-US (Cristina Calchera) (Tiziano Taccini) Tue, 29 May 2018 00:00:00 +0200 OJS 60 Physical-chemical analyses of contaminations and internal holes in dental implants of pure commercial titanium <p><strong>Background:</strong> Titanium implants are one of the main forms of tooth recovery in today's dentistry. Its form of packaging, quality control and properties vary greatly by the large number of companies. The objective of this study was to analyze four different commercial brands in their stage of sale for clinical use, according to their physicochemical properties in comparison to the international ASTM (American Society for Testing and Materials) standards.</p> <p><strong>Materials and Methods:</strong> Twelve implants were used and samples were prepared for analysis at SEM (scanning electron microscopy) and EDS (energy dispersive x-ray detector).</p> <p><strong>R</strong><strong>esults:</strong> The results showed impurities and contaminations in most samples as well as different amounts of holes within the physical structure of the implants, in threads, body and apex.</p> <p><strong>Conclusions:</strong> The contaminations and holes found suggest some quality control failure at some stage of implant production, this failure can compromise both implant resistance and its purity rating.</p> N. Penha, S. Groisman, J. Ng, O. Dias Gonçalves, M. Ferreira Kunrath ##submission.copyrightStatement## Tue, 29 May 2018 12:46:18 +0200 In vitro analysis of the fracture resistance of CAD-CAM monolithic lithium disilicate molar crowns with different occlusal thickness <p><strong>Aim: </strong>To compare the fracture resistance and mode of failure of CAD-CAM monolithic lithium disilicate crowns with different occlusal thickness.&nbsp;</p> <p><strong>Materials and methods: </strong>Thirty CAD-CAM monolithic lithium disilicate crowns with different occlusal thickness were randomly distributed into 3 experimental groups: 0.5 mm (group 1), 1.0 mm (group 2) and 1.5 mm (group 3). The restorations were cemented onto human molars with a self-adhesive resin cement. The specimens were loaded until fracture; the fracture resistance and mode of failure were recorded. The data were statistically analyzed with the one-way ANOVA followed by the Fisher’s Exact test with Bonferroni’s correction (p=0.05).</p> <p><strong>Results: </strong>The fracture resistance values of all the specimens exceeded the maximum physiological occlusal loads in molar regions. The highest fracture resistance was noticed in 1.0 mm-thick crowns. Ultrathin restorations (group 1) proved to be statistically less resistant to fracture than those of the other experimental groups (p&lt;0.05). The crowns were mainly interested by unrestorable fractures.</p> <p><strong>Conclusions: </strong>The occlusal thickness of CAD-CAM monolithic lithium disilicate crowns influences either the fracture resistance and the mode of failure of the restorations; the occlusal thickness of such restorations can be reduced up to a lower bound of 1.0 mm in order to keep sufficient strength to withstand occlusal loads; CAD-CAM monolithic lithium disilicate crowns showed sufficient fracture resistance to be used in molar regions but not in an ultrathin configuration (0.5 mm).</p> R. Sorrentino, Y. Nagasawa, M. Infelise, G. Bonadeo, M. Ferrari ##submission.copyrightStatement## Tue, 29 May 2018 12:28:36 +0200 Inter-occlusal appliance for implant site augmentation and optimal implant positioning: a ten-year follow-up case report <p><strong>Aim:</strong> Orthodontic implant site augmentation was proposed for exodontia of a hopeless tooth to improve bone architecture before implant installation. However, the use of orthodontic appliances to perform slow vertical movements and tooth extraction demands an interdisciplinary approach, increasing time and costs. The aim of this study is to present a technique of orthodontic implant site augmentation by the use of an inter-occlusal appliance.&nbsp;</p> <p><strong>Case report: </strong>A 48-year-old patient presented cervical external resorption and root fracture at the upper left central incisor. A slow orthodontic extraction of the tooth was performed by the use of an inter-occlusal appliance. After extrusion, the tooth was extracted and the implant was immediately placed. Tooth was extruded 6 mm in 8 months, at a slow rate of extrusion (0.75 mm/month) along the tooth long axis, resulting in the formation of new bone at the apex and alveolar crest, leveling its height with neighboring teeth.</p> <p><strong>Results:</strong> An increase in keratinized gingiva was observed. Final restoration was installed one year later, with adequate subgingival contour. No complications were observed after 10 years of follow-up.</p> <p><strong>Conclusions: </strong>The use of an inter-occlusal appliance provided a simple method for orthodontic extraction and implant site development, allowing optimal implant positioning with no surgical augmentation procedures.</p> A. C. P. Sant'Ana, V. T. Stuani, C. A. Damante, M. S. Ragghianti-Zangrando, S. L. A. Greghi, M. L. R. Rezende, E. Passanezi ##submission.copyrightStatement## Tue, 29 May 2018 11:11:52 +0200 Chairside protocol for posterior single-unit implant restorations in a complete digital workflow <p><strong>Aim:</strong> Introduction of a step-wise sequence for chairside treatment with a posterior single-unit implant restoration in a complete digital workflow.</p> <p><strong>Materials and Methods:</strong> The case report describes the surgical and prosthodontic workflows for the rehabilitation with an implant crown using Computer-Assisted Implant Dentistry (CAID): starting with digital data acquisition and virtual treatment planning, followed by guided implant placement including digital impression-taking, and finally CAD/CAM-processing and -production of the implant crown.</p> <p><strong>Results:</strong> The entire treatment protocol plus technical work steps are integrated in a validated seamless process using original-to-original implant components for in-house production.</p> <p><strong>Conclusions:</strong> Surgical and prosthodontic protocols for the treatment with monolithic implant crowns using CAID in a complete digital workflow without any physical models have to be considered in place of conventional manufacturing.</p> T. Joda, M. Ferrari ##submission.copyrightStatement## Tue, 29 May 2018 10:44:25 +0200