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Autologous bone grafts from intraoral donor sites display excellent volume stability over time that may contribute to optimal outcomes of the procedure.

Background/purpose In order to prevent reinfection of the pulp canal space and dressing for regenerative purpose, the coronal seal should have a perfect marginal adaptation. Mineral trioxide aggregate (MTA) and Biodentine are among the most popular sealing materials. These are commonly used in combination with antibiotic medicaments, to ensure disinfection. Aim of the present study was to evaluate the effect of 3 different medicaments on the marginal adaptation of MTA and Biodentine to the dentin. Materials and methods Teeth were divided into 4 groups (n = 20) that were treated with the following medicaments; triple antibiotic paste (TAP), double antibiotic paste (DAP), a calcium hydroxide (CH) and a control group. The specimens were then assigned into two subgroups (n = 10), which received a coronal barrier of MTA or Biodentine. The specimens were scanned using an ex vivo micro-CT scanner. The data were statistically analysed using one-way ANOVA and the unpaired Student's t-test (P < 0.05). Results Percentage volume of external voids in the MTA group was as follows: DAP > TAP > Control > CH. In the Biodentine group, the percentage of voids was determined in the following order: TAP ≥ DAP > CH > Control. Significantly lower percentage of voids was observed in the CH-medicated specimens in the MTA group when compared to all test groups (P = 0.04). Conclusion The application of CH as an intracanal medicament reduced the void occurrence between the ProRoot MTA and root dentin. However, TAP and or DAP decreased the marginal adaptation in both ProRoot MTA and Biodentine.

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Aim: The aim of this study was to assess the effectiveness of the 3-3 mandibular lingual stainless steel retainer to prevent a relapse of orthodontic treatment during the 12-year time span of the survey. Materials and methods:Fifty patients with canine-to-canine bonded retainers (placed at least 10 years earlier) were recalled. All patients had been followed up annually during this period. Patients were screened for stability of the retainer and for the condition of hard and soft oral tissues. Results:None of the patients reported a complete loss of the retainer; 14 patients reported single element partial losses and 13 reported multiple losses. Most partial failures were not perceived by patients, but noted by the orthodontist during the control visit. There was no notable variation of the gingival index occurring in these patients. In two cases patients had caries in the six teeth bonded with the retainer, but never on the lingual side; only in three teeth areas of decalcification in the proximity of bonded sites were reported. All patients showed good compliance with this kind of retention. Conclusion:The composite adhesive technique allowed a reliable positioning system for directly bonded retainers and did not influence the occurrence of carious lesions or demineralized spots on fixed teeth. Full teeth fixation offered the possibility of stabilizing the irregularity index highlighted in various studies without increasing any side effects on gums and hard tissues.

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