Clinical crown length and reduction in overjet, overbite, and dental height with orthodontic treatment |
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| Authors: | H M Abdel-Kader |
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| Institution: | 1. Orthodontic Department, Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt;1. Department of Medical Sciences, University of Trieste, Piazza dell’Ospitale 1, Trieste, Italy;2. IRCSS Burlo Garofolo, Via dell’Istria 65/1, Trieste;3. Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna and IGM-CNR, Unit of Bologna, Italy;4. Department of Oral Biology, The Dental College of Georgia, Augusta University, Augusta, GA, USA;1. Major, Canadian Armed Forces Practice Leader in Prosthodontics, Québec City, Québec, Canada;2. Clinical Associate Professor, Division of Prosthodontics Restorative Sciences, University of Minnesota School of Dentistry, Minneapolis, Minn;3. Assistant Director, Advanced Education Program in Prosthodontics, U.S. Army Dental Health Activity, Fort Gordon, Ga;4. Associate Professor and Director, Graduate Prosthodontics, Department of Restorative Dentistry, University of Washington School of Dentistry, Seattle, Wash;5. Colonel, Deputy Commander, U.S. Army Dental Laboratory, Fort Gordon, Ga;6. Professor and Section Director, Dental Materials, Department of Restorative Sciences, Dental College of Georgia at Augusta University, Augusta, Ga;1. High-performance Ceramics Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China;3. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China;4. Science and Technology of Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials and Processing Technology, No 1 South Dahongmen Road, Beijing 100076, China;1. Department of Restorative Dental Sciences, College of Dentistry, University of Dammam, Dammam, Saudi Arabia;2. Department of Preventive Dental Sciences, Division of Periodontics, College of Dentistry, University of Dammam, Dammam, Saudi Arabia;3. Department of Substitutive Dental Sciences, College of Dentistry, University of Dammam, Dammam, Saudi Arabia;4. Internship Program, College of Dentistry, University of Dammam, Dammam, Saudi Arabia;5. Department of Dental Education, College of Dentistry, University of Dammam, Dammam, Saudi Arabia |
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| Abstract: | To evaluate the clinical crown length relative to fixed-appliance orthodontic treatment of excessive overjet and deep overbite and to correlate such changes to the vertical dental height, the following measurements were undertaken for 12 females and 8 males, between the ages of 16 and 20 years, on three separate occasions-2 days before banding, 2 days after debanding, and 12 months after debanding: (1) overjet, overbite and dental height measured from right lateral cephalometric x-ray films; (2) clinical crown length, measured from study models, of 400 teeth divided into four groups-maxillary incisors and canines (120 teeth), maxillary second premolars and first molars (80 teeth), mandibular incisors and canines (120 teeth) and mandibular second premolars and first molars (80 teeth); and (3) gingival condition by means of the gingival index of Löe and Silness. Fixed edgewise orthodontic appliances were used and the four first premolars were extracted. From the results of the investigation, the following conclusions were evident: (1) after a 12-month follow-up observation period, the achieved reduction in overjet, overbite, and dental height showed relapses of 9%, 11 %, and 29%, successively; (2) only 7% of the 400 teeth examined showed reductions in clinical crown length. This change was probably the result of gingival hyperplasia. The gingival condition greatly improved by approximately 64% after 12 months of debanding, accompanied by 25% to 50% relapse in the amount of change in clinical crown length (noted 2 days after debanding); and (3) the intrusive tooth movement during orthodontic correction of deep overbite was the result of vertical movement of the tooth, with its investing tissues and soft-tissue attachment, into the jaws. The clinical crown length and vertical dental height remained practically constant. |
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