Oral Science International
Online ISSN : 1881-4204
Print ISSN : 1348-8643
Volume 6, Issue 2
Displaying 1-7 of 7 articles from this issue
ORIGINAL ARTICLES
  • Muneharu Iwamoto, Akira Matsuo, Noriko Kato, Sawako Takeuchi, Hidetosh ...
    2009 Volume 6 Issue 2 Pages 63-72
    Published: 2009
    Released on J-STAGE: December 28, 2009
    JOURNAL FREE ACCESS
    Concerning the bone structures of the mandible reconstructed by particular cellular bone and marrow (PCBM), platelet rich plasma (PRP) and tray, we have examined the possibility of implant insertion by clarifying the morphological conditions in each compact and cancellous bone on computed tomography (CT), and by observing the differences in their CT values.
    Using the computer software program Sim Plant (Materialize Dental, Leuven, Belgium), we morphologically observed 6 cases of implant inserted area after mandibular reconstruction and 11 cases of native bone, and examined the differences in their CT values. The osseointegration rate of each inserted implant was also evaluated.
    Compared with the native bone group, the PCBM reconstruction group had generally thin compact bone. In the over-3cm-length PCBM reconstruction group, the average CT value was 259.7 ± 94.4 HU (n = 3) in the cancellous bone, whereas in the native bone group, the average CT value was 528.9 ± 140.1 HU (n = 10). Therefore, the PCBM reconstruction group showed significantly lower CT value than the native bone group. However, in the under-3cm-length group, the PCBM reconstruction group showed no significant difference compared with the native bone group. The osseointegration rate of the inserted implants almost 6 months after insertion was 100% in the PCBM reconstruction group and 94.1% in the native bone group.
    Although the PCBM reconstructed bone had thinner cortical bone and showed lower CT value compared with the native bone, implant insertion was possible.
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  • Yuko Ogata, Sachiyo Matsuzaki, Masaaki Sasaguri, Yasutaka Kubota, Akir ...
    2009 Volume 6 Issue 2 Pages 73-84
    Published: 2009
    Released on J-STAGE: December 28, 2009
    JOURNAL FREE ACCESS
    In the present study, the effects of bulb type palatal lift prosthesis (bulb-PLP) therapy on nasality and velopharyngeal function (VPF) of patients with velopharyngeal incompetence (VPI) following palatoplasty were longitudinally assessed.
    The subjects included 18 patients (3 to 52 years of age) who had shown persistent VPI following palatoplasty and who had received bulb-PLP therapy. Nasality and VPF were assessed by perceptual voice analysis, nasometer test, blowing test, and cephalometric radiographic examination. Based on the outcomes of bulb-PLP therapy, the subjects were classified into two groups: the effective group and the ineffective group. Furthermore, the obturating and VPF-activating effects by bulb-PLP therapy were analyzed, and factors relating to different VPF activities were determined.
    All subjects achieved adequate VPF by wearing a bulb-PLP. After treatment, 10 patients (55.6%) achieved successful activation of VPF without bulb-PLP (the effective group), while persistent VPI remained in 8 patients (the ineffective group). The beginning-blowing ratio of the effective group was significantly greater than that of the ineffective group (P < 0.05) and the velopharyngeal distance (V-P distance) of the effective group tended to be smaller (P = 0.07). Regarding the shape of the bulb head, the angular type was dominant in the ineffective group, while the round type was dominant in the effective group.
    Bulb-PLP therapy was useful for providing adequate VPF activation. Possible signs of the subsequent effective activation of VPF are considered to be: 1) preexisting adequate VPF on blowing, 2) smaller V-P distance, and 3) synchronized palatopharyngeal movement.
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  • Srikant Natarajan, Sumita Mahajan, Karen Boaz, Thomas George
    2009 Volume 6 Issue 2 Pages 85-94
    Published: 2009
    Released on J-STAGE: December 28, 2009
    JOURNAL FREE ACCESS
    In the present study, an objective and reproducible evaluation of mitotic activity and nuclear morphometric factors was attempted in 30 patients of oral squamous cell carcinoma with a view to predicting local relapse and survival. Various nuclear parameters and volume-corrected mitotic index were calculated and compared with the recurrence and death of the study group (n = 30). Volume-corrected mitotic index (M/V index) was the single best prognosticator for recurrence of oral squamous cell carcinoma (p = 0.008 for recurrence; p = 0.015 for death). The combination of M/V and SD of nuclear area (forward stepwise regression) was a more efficient and better predictor of survival (Log rank test, Kaplan-Meier's survival analysis; χ2 = 17.46, p = 0.00001). The present study proved the effectiveness of the M/V index in predicting the biological behavior and the outcome of oral squamous cell carcinoma patients.
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REVIEW ARTICLE
  • —Multiple Factors Theory—
    Katsuhiro Toda
    2009 Volume 6 Issue 2 Pages 95-99
    Published: 2009
    Released on J-STAGE: December 28, 2009
    JOURNAL FREE ACCESS
    The right side was affected in 61% of reported cases and the left side was affected in 39% of approximately 30,000 patients with trigeminal neuralgia (TN) affected on only one side. Side-to-side asymmetry of neurovascular compression in healthy persons cannot account for side-to-side asymmetry in TN. Size asymmetry and shape asymmetry of the rotundum and ovale foramens may account for the higher incidence of TN on the right side. This paper proposes a multiple factors theory: the summation of multiple factors reaches a critical level at which TN occurs. It is rational that entrapment of the maxillary and mandibular nerves when they cross the ovale and rotundum foramens is one of the factors which cause TN. The multiple factors theory can account for a TN patient without neurovascular compression and a healthy person with neurovascular compression.
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