Provisional restorations are designed in order to protect oral structures and promote function and esthetics for a limited period of time, after which they are to be replaced by a definite prosthesis. They play a particular role in diagnostic procedures and continued evaluation of the treatment plan, as they should resemble the form and function of the definite rehabilitation that they precede. Therefore, interim treatment should satisfy the criteria of marginal adaptation, strength, and longevity. In complicated treatment plans that intend to last for extended periods of time, the function of provisional prostheses involves the possibility of relining, modification, or repair. These adjustments raise considerations regarding the strength of the resultant bond. Chemical composition of the base and repair material, surface characteristics of fracture parts, and time elapsed since the initial set of the rehabilitation should be considered in the decision of the appropriate repair material and technique. Proper pretreatment of the provisional components' surfaces is essential to ensure bonding as well.The purpose of this article is to illustrate the management of provisional restorations' deficiencies. This article highlights possible failures of custom-fabricated provisional restorations, describes methods to prevent their occurrence, and discusses clinical techniques for their management. Finally, the proper combination of materials and surface preparation to achieve the optimum treatment outcomes are presented. CLINICAL SIGNIFICANCEProvisional restorations' failures and other deficiencies are encountered by clinicians on a daily basis. Adequate laboratory techniques and material combinations presented herein may contribute to their efficient and predictable modifications and repairs. (J Esthet Restor Dent 24:26-39, 2012) The interim treatment focuses on protecting pulpal and periodontal health, promoting guided tissue healing in order to achieve an acceptable emergence profile, evaluating hygiene procedures, preventing migration of the abutments, providing adequate occlusal scheme, and evaluating maxillomandibular relationships. 2-6 From the clinician's standpoint, provisional restorations play a key role in the diagnostic procedures and continued evaluation of the treatment plan, as they must resemble

Oscillating diamond instruments are considered gentle sources for the removal of demineralized tooth hard tissues and the preparation of cavity angles and margins needed in minimally invasive dentistry. However, there is a question if literature provides enough evidence for their efficacy in restorative dentistry procedures. A literature search until May 2016 was conducted, using PubMed, Scopus, and The Cochrane Central Register of Controlled Trials databases. The quality of the studies was assessed using the recommendation of the Oxford Centre for Evidence-based Medicine. Fifty-five studies were finally included in the study. Of which, 78.2% of them were laboratory studies and only 21.8% were clinical studies. The strength of recommendation was 5 for most of them and D their grade of evidence. Bond strength of adhesives on surfaces prepared with these instruments, effective caries removal and cutting characteristics of the oscillating instruments were the main targets of the studies. Conventional diamond, steel, and chemical vapor deposition diamond tips and systems based on abrasive slurry were the oscillating tips, used in different studies. The strength of recommendation and grade of evidence of the studies were low. Although these devices seem to be useful for many clinical situations, there is a need for more well-structured evidence-based studies with more widely accepted procedures and common devices, to have more meaningful results and conclusions of higher strength.

ΣΤΗΝ ΠΕΙΡΑΜΑΤΙΚΗ ΑΥΤΗ ΜΕΛΕΤΗ 120 ΠΡΟΓΟΜΦΙΟΙ ΕΛΕΥΘΕΡΟΙ ΤΕΡΗΔΩΝΑΣ ΧΡΗΣΙΜΟΠΟΙΗΘΗΚΑΝ. ΣΤΗΝ ΠΑΡΕΙΑΚΗ ΕΠΙΦΑΝΕΙΑ ΚΑΘΕ ΔΟΝΤΙΟΥ ΜΙΑ ΚΟΙΛΟΤΗΤΑ ΤΗΣ ΟΜΑΔΟΣ ΠΑΡΑΣΚΕΥΑΣΘΗΚΕΩΣΤΕ ΤΟ ΜΑΣΗΤΙΚΟ ΟΡΙΟ ΝΑ ΕΙΝΑΙ ΣΤΗΝ ΑΔΑΜΑΝΤΙΝΗ ΚΑΙ ΤΟ ΑΥΧΕΝΙΚΟ ΣΤΗΝ ΟΣΤΕΙΝΗ. ΟΙ ΚΟΙΛΟΤΗΤΕΣ ΑΠΟΚΑΤΑΣΤΑΘΗΚΑΝ ΜΕ ΤΟΝ ΑΚΟΛΟΥΘΟ ΣΥΝΔΥΑΣΜΟ ΥΛΙΚΩΝ: SILUX + ΥΓΡΗ ΡΗΤΙΝΗ, SILUX + SCOTCHBOND, SILUX + SCOTCHBOND 2, SILUX + ADHESIT, HELIOS + ΠΕΙΡΑΜΑΤΙΚΟΣ ΣΥΓΚΟΛΛΗΤΙΚΟΣ ΠΑΡΑΓΟΝΤΑΣ ΚΑΙ KOTAC FIL ΥΑΛΟΙΟΝΟΜΕΡΗ ΚΟΝΙΑ. ΤΑ ΔΕΙΓΜΑΤΑ ΜΕΤΑ ΤΗΝ ΑΠΟΚΑΤΑΣΤΑΣΗ ΤΟΥΣ ΘΕΡΜΟΚΥΚΛΩΘΗΚΑΝ ΚΑΙ ΠΑΡΕΜΕΙΝΑΝ ΣΕ ΔΙΑΛΥΜΑ ΧΡΩΣΤΙΚΗΣ ΓΙΑ 6 ΜΗΝΕΣ. ΤΑ ΑΠΟΤΕΛΕΣΜΑΤΑ ΕΔΕΙΞΑΝ ΟΤΙ ΟΛΑ ΤΑ ΥΛΙΚΑ ΣΥΜΠΕΡΙΦΕΡΟΝΤΑΙ ΚΑΛΥΤΕΡΑ ΣΤΗΝ ΜΙΚΡΟΔΙΕΙΣΔΥΣΗ ΣΤΟ ΟΡΙΟ ΑΔΑΜΑΝΤΙΝΗΣ. ΤΟ ΑΥΧΕΝΙΚΟ ΟΡΙΟ ΕΙΝΑΙ Η ΑΔΥΝΑΤΗ ΠΕΡΙΟΧΗ ΓΙΑ ΤΗΝ ΜΙΚΡΟΔΙΕΙΣΔΥΣΗ ΜΙΑΣ ΑΠΟΚΑΤΑΣΤΑΣΗΣ. ΟΙ ΣΥΓΚΟΛΛΗΤΙΚΟΙ ΠΑΡΑΓΟΝΤΕΣ ΟΔΟΝΤΙΝΗΣ ΣΕ ΣΥΝΔΥΑΣΜΟ ΜΕ ΤΗ ΣΥΝΘΕΤΗ ΡΗΤΙΝΗ ΜΠΟΡΟΥΝ ΝΑ ΜΕΙΩΣΟΥΝ ΤΗ ΜΙΚΡΟΔΙΕΙΣΔΥΣΗ ΣΤΑ ΟΡΙΑ ΤΗΣ ΑΠΟΚΑΤΑΣΤΑΣΗΣ.