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Upper Central Incisors (upper + central_incisor)
Selected AbstractsMeasurements of Tooth Movements in Relation to Single-Implant Restorations during 16 Years: A Case ReportCLINICAL IMPLANT DENTISTRY AND RELATED RESEARCH, Issue 4 2005Torsten Jemt LSD ABSTRACT Background: Osseointegrated implants behave as ankylotic abutments, and their positions are not affected by dentofacial changes. Purpose: To measure changes in occlusion in relation to single implants in one patient after more than 15 years in function. Materials and Methods: One 25-year-old female was treated with two single implants in the upper central incisor and bicuspid area after trauma. Study casts made prior to treatment (1987) and after 16 years in function (2004) were scanned by means of an optical scanner. Using the palate as the reference, the models were placed in the same coordinate system and analyzed and compared in a computer-aided design (CAD) program. The results of the measurements of the casts were also compared with clinical photographs taken at the time of treatment (1988), after 9 years (1997), and after 16 years (2004) in function. Results: The clinical photographs showed obvious signs of implant infraposition after 9 years. New crowns were made in the incisor region after 15 years (2002), but signs of infraposition were again present at the final examination (2004). Measurements of the casts indicated small tooth movements with a pattern of slight eruption of upper teeth combined with a palatal inclination, mesial drift, and lingual inclination and crowding of the lower anterior teeth. The small measured vertical eruption of the teeth was less than the observed clinical infraposition of the implant crowns, indicating that the vertical position of the palatal may have changed in relation to the implants as well. Conclusion: Obvious dentofacial changes may take place in adult patients. Teeth may adjust for this, and no major problems may arise in the dentate patient. However, because the positions of implants are not affected by dentofacial changes, other patterns of clinical problems can be seen when implant patients present with these changes. The character and frequency of these dentofacial changes that may compromise implant treatment in the long term are not yet known. [source] Retrospective clinical study of 90 avulsed permanent teeth in 58 childrenDENTAL TRAUMATOLOGY, Issue 6 2008Vasileios Tzigkounakis We analyzed the documentations of a sample of patients containing 57 children who had a total of 90 avulsed teeth and were treated in Dentistry Department of Medical Faculty in Pilsen, Czech Republic, in the years between 1995 and 2005. We discovered that most frequently the children experience dental avulsion in the age between 8 and 11 years old, the most affected teeth are the upper central incisors and the most frequent causes are sports and games which are very common in these ages, in various environments, like schools, sport fields and home. The majority of the children were transferred to the Dentistry Department either quite long after the avulsion incident and without the avulsed teeth, or with the avulsed teeth which were carried in an inappropriate transport medium, indicating that there is insufficient knowledge of adult people, especially the ones who are in daily contact with children, on how to provide first aid in cases of dental avulsion. [source] Evaluation of intruded primary incisorsDENTAL TRAUMATOLOGY, Issue 3 2005Juliana Oliveira Gondim Abstract,,, Tooth intrusion consists of the displacement of the tooth into its alveolus and is the most common trauma during early infancy. This work aims to evaluate the aspects related to tooth intrusion in primary teeth by monitoring 16 patients (22 teeth) for a period between 3 and 36 months. Of the patients who suffered from tooth intrusion, 56.25% were male and 91% of the intruding teeth were upper central incisors. In all cases the treatment indicated was to await spontaneous re-eruption: total re-eruption occurred in 42.5% of cases, partial re-eruption in 47% of cases and in 10.5% there was no re-eruption. Twenty-three percentage of the teeth suffered necrosis, 33% suffered internal or external root resorption and none suffered root canal obliteration. Fifty-seven percentage indicated healthy pulps independent of degree of re-eruption. [source] Dental injury among Brazilian schoolchildren in the state of São PauloDENTAL TRAUMATOLOGY, Issue 3 2004Sylvia Grimm Abstract ,,,To describe the distribution of dental trauma in Brazilian schoolchildren and its association with demographic, environmental and clinical factors. A random sample of 73 243 schoolchildren's oral examination records from private and public units, selected from 131 cities within the state of São Paulo, Brazil, was analysed. Trauma was assessed based on international methodological standards prescribed by the World Health Organization for Oral Health Surveys (1997). Proportions obtained were compared between urban and rural schools, as well as between private and public units. Oral health status indices were estimated based on the decayed, missing and filled teeth (DMFT) index , the average number of decayed, missing and filled teeth; the proportion of caries-free 5-year-old schoolchildren and anterior maxillary overjet among 12-year-old schoolchildren. The prevalence of dental trauma in anterior dentition was of 2.4, enrolling average 1.2 teeth per child. A rate of 2.4 impaired anterior teeth per thousand was obtained, upper central incisors being those that were most affected , 7.7 in every 10. Among 8- to 11-year-old children, the rates grew regularly. The proportion of dental trauma was significantly higher in boys than in girls (P < 0.01), and gender prevalence ratio was of 1.58 for boys. The results showed positive associations between dental trauma and caries-free 5-year-old schoolchildren (P = 0.003), anterior maxillary overjet,3 mm (P < 0.001), and private school as a socio-economic proxy indicator (P = 0.048). [source] Dental erosion in Cuban children associated with excessive consumption of orangesEUROPEAN JOURNAL OF ORAL SCIENCES, Issue 2 2000Walter Künzel Marked erosion at the mesial edges of upper front teeth was observed during an examination of Cuban children. The preferential erosion of mesial edges produced characteristic V-shaped defects on upper central incisors, and the aim of the present study, carried out on 12-yr-old children (N=1010) in 10 communities in the Province of Havana was to establish the frequency of dental erosion and explain its occurrence. The symmetrical erosion of teeth 11 and 21 (excluding crown injuries and attrition) were clinically classified into four grades: 0.5=objectionable; 1=abnormal mesial shortening of incisal edges; 2=V-shaped defect of cutting edges; 3=exposure of dentine and extension of the erosive defect to the lateral incisors. In four of the communities, children did not show or rarely showed incisal erosion. In the other six communities, the frequency was surprisingly high (16.6,40.9%). Overall, 17.4% of children exhibited erosion, and the occurrence was significantly higher in girls (20.7%) than in boys (15.0%). The typical V-shaped pattern of erosion seems to be a consequence of the manner in which citrus fruits are eaten. There was also a positive correlation between the frequency of dental erosion and the proximity of citrus plantations, which presumably related to the extent of (daily) orange consumption. [source] Masticatory and non-masticatory dental modifications in the epipalaeolithic necropolis of Taforalt (Morocco)INTERNATIONAL JOURNAL OF OSTEOARCHAEOLOGY, Issue 6 2004B. Bonfiglioli Abstract In this study, we used standardized methods to investigate masticatory and non-masticatory dental alterations (chipping, notches, interproximal grooves) in teeth from the epipalaeolithic necropolis of Taforalt (Morocco, about 12,000,11,000 BP). The particular distribution of some of the alterations could be related to avulsion of the upper central incisors, a systematic ritual characterizing all adult individuals of the necropolis. Because of this practice, the functions of the anterior teeth (cutting and tearing portions of food while eating, holding objects, etc.) likely shifted to the posterior teeth. Copyright © 2004 John Wiley & Sons, Ltd. [source] Gingival and dentofacial changes in adolescents and adults 2 to 10 years after orthodontic treatmentJOURNAL OF CLINICAL PERIODONTOLOGY, Issue 9 2008Georges-André Theytaz Abstract Background: Information about long-term changes of the shape of the gingival margin is missing. Aim: To monitor 8 year changes of the gingival contour occurring in adolescents and adults and relate these changes to dentofacial growth. Subjects and method: Forty adolescents (mean age 16.3), and 14 adults (mean age 29.7) were included in the study with photographs, radiographs and casts taken 2 and 10 years after orthodontic treatment. The gingival contour of upper central incisors and the midline passing through the contact surface of both teeth were traced digitally using calibrated photographs. Changes were measured on seven standardized lines of the gingival contour. Lower facial height changes and tooth eruption were measured using lateral cephalograms. Results: Adolescents and adults showed a central mean apical displacement of the gingival margin of 0.51 mm (SD 0.4 mm) and 0.13 mm (SD 0.17 mm), respectively. This displacement decreased by moving away from the centre. The gingival displacement was associated to the individual's lower facial height augmentation, r=0.63 (p<0.001). Conclusions: Apical displacement of the gingival contour of the upper central incisors takes place during adolescence following a semi-lunar shape. Growth explains parts of these changes. [source] A study of labial groove-textures of upper central incisors by Shadow Moiré technologyJOURNAL OF ORAL REHABILITATION, Issue 7 2010R. ZHANG Summary, The labial groove-textures of upper central incisors were defined and explored to imitate the elaborate groove-textures for aesthetic restorations. In the current study, 158 upper central incisors were selected from 79 volunteers aged from 19 to 24 and recruited from Sichuan University in Chengdu of China. The length, width, depth, combination and distribution of the horizontal and vertical grooves on the labial surface were investigated by an optical measurement method, based on the Shadow Moiré technology and Temporal Fourier analysis. Vertical grooves were confirmed to be present in 94% of the samples and horizontal grooves in 77%. Perfect symmetry was shown in the vertical grooves of the same tooth, as well as in the homonymous teeth. The majority of horizontal grooves were distributed in the proximity of the cervical fourth and the middle of the crown. Based on the combination and distribution of the grooves, eight basic labial groove-texture types of maxillary central incisors were classified. The subtle morphological characters of natural teeth could be recorded by the new method, and it could also provide the minute groove-texture for dentists and technicians to achieve an aesthetic appearance for a restoration. [source] Subjective and objective perception of upper incisorsJOURNAL OF ORAL REHABILITATION, Issue 7 2006S. WOLFART summary, The purpose of this study was to evaluate the subjective judgment (SJ) of patients on their own dental appearance and to correlate the results with objective measurements (OM) of their dentition concerning the appearance of the upper incisors. Seventy-five participants (30 men and 45 women) with normal well-being were included in the study. In a questionnaire they judged the appearance of their upper incisors. Furthermore, OM were evaluated by the investigator with regard to the following points: (i) absolute length of the upper central incisors, (ii) their length exposed during laughing, (iii) width-to-length ratio of central incisors and (iv) the proportion between the width of the lateral and central incisors. The subjective results were registered on visual-analogue scales. For the objective results standardized photographs were taken. No gender dependent differences could be found for the objectively measured parameters (median): OM1, 10·7 mm; OM2, 8·1 mm; OM3, 0·81; OM4, 0·79. However, significant correlations between subjective and objective results (SJ1/OM1, SJ2/OM2, SJ3/OM3) could be shown for men, but not for women. The maximum of the calculated regression-curves for men reflect ,golden standard values' well known from the literature. The degree of satisfaction concerning appearance of anterior incisors in accordance with golden standard values is higher for men than for women. [source] Performance of Five Commercially Available Tooth Color-Measuring DevicesJOURNAL OF PROSTHODONTICS, Issue 2 2007Alma Dozi Purpose: Visual tooth color assessment is neither accurate nor precise due to various subjective and objective factors. As newly developed tooth color-measuring devices for dental application provide the possibility of a more objective means of color determination, their performances in vitro and in vivo must be evaluated. The objective of this study was to evaluate the accuracy and precision of five commercially available tooth color-measuring devices in standardized and in clinical environments. Materials and Methods: In an in vitro study, standards (A1, A2, A3, A3.5, and A4 shade tabs of Vita Lumin) were measured five times with five electronic devices (ShadeScan, Easyshade, Ikam, IdentaColor II, and ShadeEye) by two operators. In an in vivo study, the right upper central incisors of 25 dental students were measured with the same electronic devices by a single operator. Vita shade tab codes were expressed as CIE (International Commission on Illumination) L*a*b* values and in terms of the precision and accuracy of ,E color differences. The Mann-Whitney statistical test was used to analyze the differences between the two operators in the in vitro study, and the Kruskal-Wallis one-way analysis of variance on ranks with the post-hoc Tukey test was used to analyze the accuracy and precision of electronic devices. Results: No statistically significant difference was found between the different operators in the in vitro study. The obtained precision was Easyshade > ShadeScan , Ikam > IdentaColor II > ShadeEye. The obtained accuracy was Easyshade > ShadeScan , Ikam > ShadeEye > IdentaColor II. In the in vivo study, the Easyshade and the Ikam were the most precise, and the ShadeEye and the IdentaColor II were more precise than the ShadeScan. With respect to accuracy, there was no statistical difference between the ShadeScan, Ikam, and the Easyshade. The IdentaColor II was considered inaccurate (,Ea= 3.4). Conclusions: In the clinical setting, the Easyshade and Ikam systems were the most reliable. The other devices tested were more reliable in vitro than in vivo. [source] | ||||||||||