49 research outputs found

    The assessment of orthodontic bonding defects: Optical coherence tomography followed by three dimensional reconstruction

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    Orthodontic bonding is a simple yet important procedure that can influence the outcome of treatment in case it is performed incorrectly. An orthodontic treatment shadowed by repeated bonding failures can become unduly long and will decrease patient trust and compliance. Optical coherence tomography has been widely used in ophtalmology but is relatively new to dentistry. Using OCT one can detect aerial inclusions within the orthodontic adhesive or even identify incongruence between the bracket base and the tooth surface. The aim of our study was to identify bonding defects and reconstruct them three-dimensionally in order to be able to characterize them more accurately. We bonded 30 sound human permanent teeth with ceramic orthodontic brackets using a no-mix self-curing orthodontic adhesive. Prior to bonding all teeth were stored in tap water at 4°C and then professionally cleaned with rotary brushes and pumice. The samples were processed by the same person and the rotary brushes were changed after every fifth tooth. All interfaces were investigated by means of OCT and 4 defects were found. Subsequently, the defects were reconstructed threedimensionally using an open-source program. By identifying and reconstructing bonding defects we could assess the quality of the bonding procedure. Since bonding tends to be more accurate in vitro where the environmental conditions are close to ideal, it is probable that defects found in vivo be even greater in number, which leads to the conclusion that this type of investigation is potentially valuable. © 2011 SPIE

    En-Face optical coherence tomography and fluorescence in evaluation of orthodontic interfaces

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    Bonding has become a routine procedure in several dental specialties - from prosthodontics to conservative dentistry and ven orthodontics. In many of these fields it is important to be able to investigate the bonded interfaces to assess their quality. All currently employed investigative methods are invasive, meaning that samples are destroyed in the testing procedure and cannot be used again. We have investigated the interface between human enamel and bonded ceramic brackets non-invasively, introducing a combination of new investigative methods - optical coherence tomography (OCT), fluorescence OCT and confocal microscopy (CM). Brackets were conventionally bonded on conditioned buccal surfaces of teeth. The bonding was assessed using these methods. Three dimensional reconstructions of the detected material defects were developed using manual and semi-automatic segmentation. The results clearly prove that OCT, fluorescence OCT and CM are useful in orthodontic bonding investigations

    Technological aspects, numerical simulation and noninvasive imagistic approach on resin bonded fixed partial prosthesis

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    Working with resin bonded fixed partial prosthesis could lead a rapid debonding in some cases. This study try to evaluate the possibilities to reduce the problems in that kind of fixed partial prosthesis

    Orthodontic bonding of tooth colored brackets from a different perspective: An optical coherence tomography investigation

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    Bracket bonding has become routine procedure in fixed orthodontics over the past couple of decades. The choice whether to receive ceramic or polycarbonate brackets is mainly the patient's but the issues related to bonding them are part of the practitioner's responsibility. Recurrent bracket debonding can unduly prolong treatment or even lead to compromised results. Therefore, we collected human extracted premolars and bonded them with aesthetic brackets and investigated them by a new, non-invasive method - optical coherence tomography (OCT) in order to assess the quality of the bracket-tooth interface. The OCT investigation revealed a series of gaps within the adhesive at the bracket-tooth interface

    Marginal adaptation of ceramic veneers investigated with en-face optical coherence tomography

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    The aim of this study was to analyze the quality of marginal adaptation and gap width of Empress veneers using en-face optical coherence tomography. The results prove the necessity of investigating the marginal adaptation after each veneer bonding process

    The use of spectral domain optical coherence tomography in orthodontics

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    Optical coherence tomography is a new noninvasive investigation method with various applications in dentistry and orthodontics respectively. The intra-oral OCT investigation opens a totally new perspective on the investigation of orthodontic bonding. Polymeric orthodontic brackets (Damon Clear) were bonded on the teeth of the upper arch of a patient following the manufacturer instructions with a light-curing orthodontic adhesive (Blugloo). After bonding the teeth were examined by spectral OCT in order to examine the interface formed by the enamel, orthodontic resin and the bracket. Several images were obtained. Intra-oral OCT is a method of great potential and real benefits in elaborating a prognosis on the clinical durability of bonded polymeric brackets
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