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Yonghoon Choi - One of the best experts on this subject based on the ideXlab platform.

  • surgical Extrusion of a maxillary premolar after Orthodontic Extrusion a retrospective study
    Journal of The Korean Association of Oral and Maxillofacial Surgeons, 2019
    Co-Authors: Yonghoon Choi
    Abstract:

    Objectives: Crown-root fracture and cervical caries in maxillary premolars constitute a challenge in cases of subgingival placement of restoration margins. Surgical Extrusion has been practiced successfully in permanent anterior teeth. The aim of the present retrospective study was to assess the clinical outcome of surgical Extrusion after Orthodontic Extrusion in maxillary premolars. Materials and Methods: Twenty-one single, tapered root maxillary premolars with subgingival crown-root fracture or caries were included. Presurgical Orthodontic Extrusion was performed on all teeth to prevent root resorption. Extent of Extrusion and rotation was determined based on crown/root ratio. The postoperative splinting period was 7 to 14 days. Clinical and radiographic examination was performed at an interval of 1, 2, and 3 months. Results: After the mean follow-up of 41.9±15.2 months, failure was observed as increased mobility in 3 of 21 cases. No significant difference was observed in the outcome of surgical Extrusion based on tooth type, age, sex, 180° rotation, or time for extraction. Furthermore, marginal bone loss was not observed. Conclusion: Surgical Extrusion of maxillary premolars can be a possible therapeutic option in cases of subgingival crown-root fracture.

  • clinical outcome of intentional replantation with preoperative Orthodontic Extrusion a retrospective study
    International Endodontic Journal, 2014
    Co-Authors: Yonghoon Choi
    Abstract:

    Aim To evaluate retrospectively the clinical outcomes of intentional replantation (IR) of teeth in terms of tooth survival and periradicular healing and to investigate their prognostic factors. Methodology Two hundred and eighty-seven teeth treated by IR were analysed retrospectively. Clinical outcomes between the cases with preoperative Orthodontic Extrusion for 2–3 week and those without Extrusion were analysed. The outcomes of IR were determined by clinical and radiographic evaluation. Tooth survival and periradicular healing estimates were compared using Kaplan–Meier analysis. The contribution of a patient's age and gender, tooth type and location, and preoperative Orthodontic Extrusion was investigated using the multivariate Cox proportional hazard model. Results The mean follow-up period was 25.4 ± 9.3 months. The overall success rate of IR was 89.5% based on periradicular healing. The overall survival rate was 95.1%. The survival rates were 91.2% for the teeth extracted without Extrusion and 98.1% for those extracted with Extrusion. Amongst the variables tested, only the extraction technique with preoperative Orthodontic Extrusion significantly affected the survival rate (P = 0.016). Other prognostic variables, such as age and gender, tooth type and location, did not affect the survival of intentionally replanted teeth. Conclusions Intentional replantation was a viable treatment option for teeth with previously failed nonsurgical root canal treatment, regardless of a patient's age and gender, and tooth type and location. Preoperative Orthodontic Extrusion for 2–3 weeks reduced root resorption and tooth fracture and can be recommended to enhance the outcome of IR.

B Liljenberg - One of the best experts on this subject based on the ideXlab platform.

  • periodontal tissue reactions to Orthodontic Extrusion an experimental study in the dog
    Journal of Clinical Periodontology, 1991
    Co-Authors: Tord Berglundh, C P Marinello, Jan Lindhe, B Thilander, B Liljenberg
    Abstract:

    : Orthodontic tooth Extrusion is used at crown lengthening procedures or in conjunction with periodontal therapy aimed at eliminating or reducing angular bone defects. A technique for Orthodontic Extrusion combined with resection of the supracrestal attachment fibers (fiberotomy) was recently proposed as an adjunct to certain restorative procedures. The aim of the present investigation was to analyze reactions of the periodontal tissues to Orthodontic Extrusion when combined with fiberotomy. In 5 beagle dogs, the mesial roots of the 2nd, 3rd and 4th hemisected mandibular premolar were used as target roots while the distal roots served as reference units. After a baseline examination, an Orthodontic Extrusion device (stent) was installed and reactivated at 2-week intervals during an 8-week period of active tooth movement. Immediately following the installation of the stent and once every 2nd week, the target roots were exposed to fiberotomy. After the active period, the teeth were retained in their new position for a period of 8 weeks. Clinical, radiographical and histological measurements were performed. The results from the investigation demonstrated that Orthodontic Extrusion combined with supracrestal fiberotomy resulted in a coronal displacement of the tooth and was associated with pronounced recession of the gingival margin and extensive loss of connective tissue attachment. The degree of gingival recession and the amount of loss of connective tissue attachment were, however, less extensive than the amount of tooth Extrusion. Thus, repeated fiberotomy obviously failed to entirely prevent coronal migration of the attachment apparatus. It was also observed that undesired attachment loss had occurred at the reference roots.

Kemal Naci Kose - One of the best experts on this subject based on the ideXlab platform.

  • Orthodontic Extrusion with circumferential supracrestal fiberotomy a report of two cases
    Turkish Journal of Orthodontics, 2018
    Co-Authors: Elvan Onem Ozbilen, Hanife Nuray Yilmaz, Kemal Naci Kose
    Abstract:

    : Surgical Extrusion, surgical crown lengthening, and Orthodontic Extrusion (OE) with circumferential supracrestal fiberotomy (CSF) are reported as effective methods in cases when clinical crowns are destroyed. The aim of these case reports was to evaluate the results of OE+CSF in a canine and a mandibular second molar tooth. Case 1: A 24-year-old male patient was referred with a fracture of the maxillary canine at the subgingival level. After the examinations, OE+CSF was planned. Following leveling-aligning, a mini-screw was placed into the root canal of the canine, and 50 g of extrusive force was applied from the mini-screw to a stainless steel (SS) wire. Case 2: A 67-year-old female patient was referred with a mandibular second molar destroyed at the gingival level. OE+CSF was planned. An extrusive force (50 g) was applied from the segmental SS wire to the hook inserted into the root canal. CSF and root planning (RP) were performed weekly in both patients. Overall, 5 mm of Extrusion was achieved for the upper canine after 6 weeks of active Extrusion in Case 1. In Case 2, 5 mm of Extrusion was achieved after 3 weeks of active Extrusion. OE+CSF is an effective and rapid method for the Extrusion of teeth with insufficient clinical crown.

Suvarna Patil - One of the best experts on this subject based on the ideXlab platform.

Tord Berglundh - One of the best experts on this subject based on the ideXlab platform.

  • periodontal tissue reactions to Orthodontic Extrusion an experimental study in the dog
    Journal of Clinical Periodontology, 1991
    Co-Authors: Tord Berglundh, C P Marinello, Jan Lindhe, B Thilander, B Liljenberg
    Abstract:

    : Orthodontic tooth Extrusion is used at crown lengthening procedures or in conjunction with periodontal therapy aimed at eliminating or reducing angular bone defects. A technique for Orthodontic Extrusion combined with resection of the supracrestal attachment fibers (fiberotomy) was recently proposed as an adjunct to certain restorative procedures. The aim of the present investigation was to analyze reactions of the periodontal tissues to Orthodontic Extrusion when combined with fiberotomy. In 5 beagle dogs, the mesial roots of the 2nd, 3rd and 4th hemisected mandibular premolar were used as target roots while the distal roots served as reference units. After a baseline examination, an Orthodontic Extrusion device (stent) was installed and reactivated at 2-week intervals during an 8-week period of active tooth movement. Immediately following the installation of the stent and once every 2nd week, the target roots were exposed to fiberotomy. After the active period, the teeth were retained in their new position for a period of 8 weeks. Clinical, radiographical and histological measurements were performed. The results from the investigation demonstrated that Orthodontic Extrusion combined with supracrestal fiberotomy resulted in a coronal displacement of the tooth and was associated with pronounced recession of the gingival margin and extensive loss of connective tissue attachment. The degree of gingival recession and the amount of loss of connective tissue attachment were, however, less extensive than the amount of tooth Extrusion. Thus, repeated fiberotomy obviously failed to entirely prevent coronal migration of the attachment apparatus. It was also observed that undesired attachment loss had occurred at the reference roots.