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Posterior Position (posterior + position)
Selected AbstractsStability Measurements of Osseointegrated Implants Using Osstell in Partially Edentulous Jaws after 1 Year of Loading: A Pilot StudyCLINICAL IMPLANT DENTISTRY AND RELATED RESEARCH, Issue 3 2002Piero Balleri MD ABSTRACT Background: The introduction of resonance frequency analysis (RFA) as a commercially available technique has made it possible to measure implant stability in implant stability quotient (ISQ) units at any time during the course of implant treatment and loading. However, no information on normal ISQ levels can be found in the literature. Purpose: The aim of this pilot study was to measure the stability of clinically successful implants in partially edentulous patients after 1 year of loading and to study the influence of jaw, anterior/posterior position, implant length, and marginal bone level on implant stability. Materials and Methods: Fourteen partially edentulous patients previously treated with 45 implants were subjected to clinical and radiographie evaluations and RFA measurements using Osstell (Integration Diagnostics, Sävedalen, Sweden) after 1 year of loading. Results: All 45 implants were stable, and implant stability levels were in the range of 57 to 82 ISQ units with a mean of 69 ± 6.5 ISQ after 1 year of loading. Mandibular implants were more stable than were maxillary ones. There were no differences between anterior and posterior implants. No correlation could be found between implant length and stability. Only minor marginal bone resorption was observed. Conclusions: The results from this limited material showed that successfully integrated implants have ISQ levels from 57 to 82 ISQ with a mean of 69 ISQ after 1 year of loading. Mandibular implants are more stable than are maxillary ones. High implant stability can be achieved with short implants and placement in posterior regions. [source] Cephalic morphology of Pythonichthys macrurus (Heterenchelyidae: Anguilliformes): specializations for head-first burrowingJOURNAL OF MORPHOLOGY, Issue 9 2010Soheil Eagderi Abstract The Heterenchelyidae, a family of Anguilliformes, are highly specialized fossorial eels. This study was conducted to evaluate the cranial specialization in relation to head-first burrowing behavior in the heterenchelyid, Pythonichthys macrurus. Thereby, detailed descriptions are provided of the cranial myology and osteology of P. macrurus and its differences with that of representatives of three families: the Moringuidae (Moringua edwardsi), a head-first burrower; the Anguillidae (Anguilla anguilla), a nonburrowing representative and the Ophichthidae (Pisodonophis boro), a head and tail-first burrower. This comparison may help to get a better understanding of the cranial specialization of head-first burrowers in heterenchelyids and moringuids. We recognize as morphological adaptations to burrowing: reduced eye size, a caudoventral orientation of the anteromedial section of the adductor mandibulae muscle complex, the posterior position of the quadrate-mandibular joint, a solid conical skull, large insertion sites of epaxial and hypaxial muscle on the neurocranium, a widened cephalic lateral line canals extending into the dermal cavities, and a ventral position of the gill opening. J. Morphol. 271:1053-1065, 2010. © 2010 Wiley-Liss, Inc. [source] Body posture during sleep and disc displacement in the temporomandibular joint: a pilot studyJOURNAL OF ORAL REHABILITATION, Issue 2 2005H. HIBI summary, ,Many possible factors associated with internal derangement of the temporomandibular joint (TMJ) have been discussed, but the causal factors remain unproven. The present study aimed to investigate habitual body posture during sleep (HBP) of patients with anterior disc displacement (ADD) in the TMJ. The sample comprised 87 patients (12 males, 75 females) aged 13,68 years (mean 25 years) and diagnosed by magnetic resonance imaging as having unilateral or bilateral ADD in the TMJ. The HBPs were classified into five categories: supine, prone, right lateral, left lateral, and no-dominant positions. Of the 50 patients with the unilateral ADD, 33 (66%) had the ipsilateral HBP to the affected joint while none (0%) had the contralateral HBP. This contrast showed that the HBP was a possible contributing factor to the ADD. It was suggested that HBP allows the ipsilateral condyle to displace posteriorly and this posterior position causes relative ADD. [source] Association between condylar position, joint morphology and craniofacial morphology in orthodontic patients without temporomandibular joint disordersJOURNAL OF ORAL REHABILITATION, Issue 11 2003K. Kikuchi summary, The present study investigated condylar position and joint morphology in adolescent patients and elucidated the possible association between the joint structure and condylar position, and craniofacial morphology. Sixty-five adolescent patients were selected as subjects and their tomograms and lateral cephalograms were analysed. No significant differences in joint spaces were found between the right and left temporomandibular joints. Both the condyles in this population were located slight anteriorly in the glenoid fossa. With respect to the association between condylar position, joint morphology and craniofacial morphology, the ramus plane angle also exhibited significant negative correlations with posterior, lateral and medial joint spaces. Furthermore, there was a significant negative correlation between the gonial angle and the anterior joint space. These findings imply that the condyle was likely to show more posterior position in the glenoid fossa when the mandible exhibited clockwise rotation. In conclusion, the condyle in the adolescent subjects showed a symmetrical anterior position relative to the glenoid fossa. In addition, the joint spaces and it ratios were significantly related to the craniofacial morphology associated with vertical dimension. It is suggested that the condylar position may be affected by craniofacial growth pattern. [source] Recurrent persistent occipito-posterior position in subsequent deliveriesBJOG : AN INTERNATIONAL JOURNAL OF OBSTETRICS & GYNAECOLOGY, Issue 2 2004Mikael Gardberg A nine year follow up study of the delivery pattern of 119 women after delivery in the persistent occiput posterior position and their occipito-anterior controls. The studied parameters were: number of deliveries, number of repeated cases of persistent occiput posterior position and operative deliveries. Deliveries in the occipito-posterior position were more common in the study group than in the controls (P= 0.031). Except for this, no statistically significant differences were found between the groups. According to the results, recurrence of the persistent occiput posterior position is common. A history of delivery in the persistent occiput posterior position does not seem to have any major impact on future childbearing. [source] Electrocardiogram-Based Algorithm to Predict the Left Ventricular Lead Position in Recipients of Cardiac Resynchronization SystemsPACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 2009SYLVAIN PLOUX M.D. Introduction: Biventricular pacing is associated with various electrocardiographic patterns depending on the position of the left ventricular (LV) lead. We aimed to develop an electrocardiogram-based algorithm to predict the position of the LV lead. Methods: The algorithm was developed in 100 consecutive recipients of cardiac resynchronization therapy (CRT) systems. QRS axis, morphology, and polarity were analyzed with a view to define the specific electrocardiographic characteristics associated with the various LV lead positions. The algorithm was prospectively validated in 50 consecutive CRT device recipients. Results: The first analysis of the algorithm was the QRS morphology in V1. A positive R wave in V1 suggested LV lateral or posterior wall stimulation. A QS pattern was specific of anterior LV leads. In the presence of an R wave in V1, V6 was analyzed to distinguish between an inferior and anterior LV lead. Inferior leads were never associated with a positive V6. To differentiate between lateral and posterior positions, we analyzed the pattern in V2. Lateral leads were associated with an R morphology in V1 and a negative V2. Posterior leads were associated with an R morphology in V1 and V2. The algorithm allowed a reliable distinction between an inferior or anterior and a lateral or posterior lead position in 90% of patients. Inferior, anterior, lateral, and posterior positions were reliably distinguished in 80% of patients. Conclusion: This algorithm predicted the position of the LV lead with a high sensitivity and predictive value. [source] | ||||||||||