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Cervical Area (cervical + area)
Selected AbstractsApexogenesis after initial root canal treatment of an immature maxillary incisor , a case reportINTERNATIONAL ENDODONTIC JOURNAL, Issue 1 2010S. R. Kvinnsland Abstract Aim, To present a case where a traumatized, immature tooth still showed capacity for continued root development and apexogenesis after root canal treatment was initiated based on an inaccurate pulpal diagnosis. Summary, Traumatic dental injuries may result in endodontic complications. Treatment strategies for traumatized, immature teeth should aim at preserving pulp vitality to ensure further root development and tooth maturation. A 9-year-old boy, who had suffered a concussion injury to the maxillary anterior teeth, was referred after endodontic treatment was initiated in tooth 21 one week earlier. The tooth had incomplete root length, thin dentinal walls and a wide open apex. The pulp chamber had been accessed, and the pulp canal instrumented to size 100. According to the referral, bleeding from the root made it difficult to fill the root canal with calcium hydroxide. No radiographic signs of apical breakdown were recorded. Based on radiographic and clinical findings, a conservative treatment approach was followed to allow continued root development. Follow-up with radiographic examination every 3rd month was performed for 15 months. Continued root formation with apical closure was recorded. In the cervical area, a hard tissue barrier developed, which was sealed with white mineral trioxide aggregate (MTA). Bonded composite was used to seal the access cavity. At the final 2 years follow-up, the tooth showed further root development and was free from symptoms. Key learning points, ,,Endodontic treatment of immature teeth may result in a poor long-term prognosis. ,,The pulp of immature teeth has a significant repair potential as long as infection is prevented. ,,Treatment strategies of traumatized, immature permanent teeth should aim at preserving pulp vitality to secure further root development and tooth maturation. ,,Radiographic interpretation of the periapical area of immature teeth may be confused by the un-mineralized radiolucent zone surrounding the dental papilla. [source] Spectrophotometric Analysis of Tooth Color Reproduction on Anterior All-Ceramic Crowns: Part 2: Color Reproduction and Its Transfer from In Vitro to In VivoJOURNAL OF ESTHETIC AND RESTORATIVE DENTISTRY, Issue 1 2010AKI YOSHIDA RDT ABSTRACT Color reproduction of an anterior tooth requires advanced laboratory techniques, talent, and artistic skills. Color matching in a laboratory requires the successful transfer from in vivo with careful considerations. The purpose of this study was to monitor and verify the color reproduction process for an anterior all-ceramic crown in a laboratory through spectrophotometric measurements. Furthermore, a crown insertion process using composite luting cements was assessed, and the final color match was measured and confirmed. An all-ceramic crown with a zirconia ceramic coping for the maxillary right central incisor was fabricated. There was a significant color difference between the prepared tooth and the die material. The die material selected was the closest match available. The ceramic coping filled with die material indicated a large color difference from the target tooth in both lightness and chromaticity. During the first bake, three different approaches were intentionally used corresponding with three different tooth regions (cervical, body, and incisal). The first bake created the fundamental color of the crown that allowed some color shifts in the enamel layer, which was added later. The color of the completed crown demonstrated an excellent color match, with ,E 1.27 in the incisal and 1.71 in the body. In the cervical area, color match with ,E 2.37 was fabricated with the expectation of a color effect from the underlying prepared tooth. The optimal use of composite luting cement adjusted the effect from the underlying prepared tooth color, and the color match fabricated at a laboratory was successfully transferred to the clinical setting. The precise color measurement system leads to an accurate verification of color reproduction and its transfer. CLINICAL SIGNIFICANCE The use of a dedicated dental spectrophotometer during the fabrication of an all-ceramic crown allows the dentist and the laboratory technician to accurately communicate important information to one another about the shade of the tooth preparation, the shade of the contralateral target tooth, and the influence of luting cement on the final restoration, thereby allowing the technician better control over the outcome of their tooth color matching efforts and the final color match of an all-ceramic restoration. (J Esthet Restor Dent 22:53,65, 2010) [source] Prevalence of Noncarious Cervical Lesions and Their Relation to Occlusal Aspects: A Clinical StudyJOURNAL OF ESTHETIC AND RESTORATIVE DENTISTRY, Issue 1 2000DANIEL TELLES DDS ABSTRACT Purpose: The purpose of this study was to assess noncarious cervical lesions in young patients and to establish a possible relation with occlusal aspects. Materials and Methods: Forty-eight dental students (28 males; 20 females) between the ages of 16 and 24 years, were investigated to verify the presence of noncarious cervical lesions and their relation to some occlusal aspects. The assessment involved a questionnaire, clinical examinations, and model analysis. Results: The results indicated that the lower first molars (21.3%), the upper first molars (16.0%), the upper first premolars (12.8%), the lower first premolars (11.7%), and the lower second premolars (11.7%) were the teeth most affected by the lesions. Age was a significant factor with respect to the presence of lesions; the students with noncarious cervical lesions were older than the students who showed no lesions. Among the 79 teeth exhibiting lesions, 62 (78.5%) showed wear facets. In the group with lesions, the mean, per subject, was 15.0 teeth with wear facets, whereas in the group without lesions the mean was 10.8 teeth with wear facets per subject, suggesting that occlusal stress has some effect on lesion development. CLINICAL SIGNIFICANCE Noncarious cervical lesions are characterized by loss of tooth structure on the cervical area of the tooth and can result in esthetic problems for the patient, as well as discomfort due to the hyper-sensibility that often occurs at the location of the lesion. The results obtained reinforce the multifactorial theory, shared by several authors, for the etiology of such lesions. However, as the limitations of each etiologic agent begin to be understood, there will be a decrease in the possibility of misleading interpretations of the result of present or future investigations. [source] In vitro differences of stress concentrations for internal and external hex implant,abutment connections: a short communicationJOURNAL OF ORAL REHABILITATION, Issue 1 2006Y. MAEDA summary, The aim of this study was to clarify the difference in the stress distribution patterns between implants with external-hex or internal-hex connection systems using in vitro models. Three 13 mm fixtures with external-hex and internal-hex connections were installed into an acrylic bone analogue. One piece abutments of 7 mm height was connected. Strain gauges were attached to the abutment surface, and the cervical and fixture tip areas of the bone analogue surface. Vertical and horizontal load applied was 30 N. Data were normalized for each model by obtaining values relative to the sum of the three values. Almost the same force distribution pattern was found under vertical load in both systems. Fixtures with external-hex showed an increase in strain at the cervical area under horizontal load, while in internal-hex fixtures the strain was at the fixture tip area. Within limitations of our model study, it was suggested that fixtures with internal-hex showed widely spread force distribution down to the fixture tip compared with external hex ones. [source] The use of magnetic resonance imaging in the management of pharyngeal penetration injuries in dogsJOURNAL OF SMALL ANIMAL PRACTICE, Issue 2 2008M. J. Dobromylskyj Objectives: To investigate the correlation between the magnetic resonance imaging findings and subsequent surgical findings for a series of dogs presenting with suspected pharyngeal stick injuries to the Animal Health Trust, Newmarket, between 1995 and 2004. Methods: Magnetic resonance imaging findings were reviewed for patients undergoing a scan of the pharyngeal or cervical area for suspected foreign bodies during the years 1995 to 2004. Results: Case signalment, history and clinical signs were similar to those reported in previous studies. Magnetic resonance imaging demonstrated foreign material in six of seven cases where this was present. There was good correlation between diagnosis of a foreign body at magnetic resonance imaging and subsequent surgical identification. Clinical Significance: Compared with other imaging modalities, magnetic resonance imaging is very helpful for this type of injury, especially in chronic cases where radiographic evidence of a foreign body is unlikely. It is a valuable aid in the diagnosis of pharyngeal penetration injury and in surgical planning. [source] Dry type leishmanial lymphadenitis presented as two large parotid and cervical massesINTERNATIONAL JOURNAL OF DERMATOLOGY, Issue 7 2007I. Esfandiarpour MD Background, Cutaneous leishmanisis (CL) is a common disease in Iran, particularly in Kerman and Bam and Kerman province. Lymphadenitis resulting from leishmania tropica (dry type) with, or without, cutaneous lesion is rare. Localized leishmanial lymphadenitis (LLA) is a specific clinico-pathologic presentation of inflammatory changes caused by leishmanial parasites or antigen within an isolated lymph node without any systemic manifestation. Case report, A 55-year-old Iranian woman presented with two slow growing large nodules (masses) on the left preauricular and the left cervical areas. The nodules were large, painless, mobile, multilobulated, and associated with a small skin papule on the left-side of the cheek distal to the masses. Results, Histopathologic examination of both the skin lesion and the lymph nodes suggested the leishmanial etiology of skin papule and lymphadenitis. The Leishman-bodies (amastigotes) were demonstrated in two lymph nodes and a skin lesion. The clinical picture plus pathological finding and the response to meglumine-antimoniate confirmed LLA. Conclusion, Lymph node involvement is another rare manifestation of dissemination of infection with dermotropic leishmania. This presentation of CL should not be treated with the ordinary local treatments such as curettage, cryotherapy or surgical excision. [source] CLINICAL CONSIDERATIONS FOR RESTORING MANDIBULAR INCISORS WITH PORCELAIN LAMINATE VENEERSJOURNAL OF ESTHETIC AND RESTORATIVE DENTISTRY, Issue 4 2008Robert D. Walter DDS Authors Porcelain laminate veneers have been proven to be a successful treatment modality for maxillary incisors in clinical practice and in controlled clinical studies. However, the data in clinical studies on the success of veneers for restoring mandibular incisors are limited. Clinically, the successful restoration of mandibular incisors with porcelain laminate veneers is one of the more challenging procedures in all of esthetic restorative dentistry. Limited coronal dimensions, the small amount of enamel available for bonding (particularly in the cervical areas), materials and techniques for the bonding procedures, and the response of the tooth,veneer complex to forces generated during the incisal loading in both functional as well as parafunctional contacts must be considered as potential sources of success or failure. This Critical Appraisal reviews three recent scientific articles to shed some light on these issues and, as in all research endeavors, leads the reader to identify additional areas of concern that might stimulate further scientific inquiry. The first publication studied predictors for enamel thickness for mandibular incisors. The second examined bonding protocols for exposed dentin and suggested immediate dentin sealing. The third paper addressed fracture behavior of mandibular incisors restored with porcelain laminate veneers in vitro. [source] Craniofacial cephalometric morphology in children with CATCH 22 syndromeORTHODONTICS & CRANIOFACIAL RESEARCH, Issue 4 2006A Heliövaara Structured abstract Authors ,, Heliövaara A, Hurmerinta K Objectives ,, To evaluate cephalometrically the craniofacial, pharyngeal and cervical morphology in children with CATCH 22, and to compare and quantify the findings with age- and sex-matched controls. Design ,, A retrospective case,control study. Setting and Sample Population , Forty-one children (20 girls) with CATCH 22 were compared with age- and sex-matched controls from lateral cephalograms taken at the mean age of 8.5 years (range 5.8,12.9). The deletion of 22q11 was verified by fluorescence in situ hybridization techniques. Thirteen of the children with CATCH 22 had palatal clefts. Outcome measure ,, Linear and angular measurements were obtained from lateral cephalograms. A Student's t -test and a paired Student's t -test were used in the statistical analysis. Standard deviation scores (SDS) were calculated to quantify the variation. Results ,, Children with CATCH 22 had obtuse cranial base angles and long anterior cranial bases. Their faces were long with increased facial convexity. The maxillae were long but both jaws were retrognathic and the lower jaws posteriorly diverged. The pharynges were wide in the nasopharyngeal area and narrow in the hypopharyngeal area. The development of the hyoid bones was delayed, and hyoid bone and atlas lengths were reduced. The morphology of the children with CATCH 22 with and without a palatal cleft was similar. Despite several statistically significant differences between the children with CATCH 22 and the controls, the SDS did not exceed ±2 for any of the measurements. Conclusion ,, Children with CATCH 22 have several minor distinctive morphological features in the craniofacial, pharyngeal, and cervical areas. [source] Cutaneous presentation of recurrence of lymphoepithelioid T-cell lymphoma (Lennert's lymphoma)CLINICAL & EXPERIMENTAL DERMATOLOGY, Issue 2 2005C. Massone Summary Lennert's lymphoma (LL) is a T-cell lymphoma characterized by the presence of atypical T lymphocytes, admixed with histiocytes and epithelioid granulomas. Patients present with superficial lymph node involvement, mainly in the cervical areas; thoracic adenopathies and involvement of deep abdominal lymph nodes are rare. Cutaneous involvement is infrequent, reported to occur in only 4,11% of patients, and even rarer is the onset of cutaneous lesions as first sign of a recurrence. We report a female patient who presented with papules and nodules on the trunk and upper limbs as the first manifestation of recurrent LL. [source] | ||||||||||