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1.
The objective of this report was to determine the radiographic patterns of alveolar bone loss in early-onset periodontitis (EOP) cases in a selected Malaysian population. The radiographs of 55 cases of EOP patients were examined and the radiographic patterns were classified as follows: Type I: bone destruction on first molars and/or incisors only; Type II: bone destruction on first molars and/or incisors and several additional teeth (less than 14 teeth); Type III: generalized bone destruction (greater than 14 teeth), but with involvement noticeably more extensive on the first molars and/or incisors; Type IV: generalized bone destruction (greater than 14 teeth), but with no more bone loss on the first molars and/or incisors than on other involved teeth. Sex, age, and missing teeth were also recorded. Out of 55 cases, 47 cases, 22 males and 25 females, were classified into the types mentioned above; the remaining 8 cases were excluded due to too many missing teeth. It was found that 7 (14.9%) were Type I; 12 (25.5%) were Type II; 7 (14.9%) were Type III; and 21 (44.7%) were Type IV. There was a predominance of first molar/incisor involvement in Types I, II, and III with the maxillary first molars most frequently involved followed by the mandibular central incisors. Type I occurred in the younger age group and Types II, III, and IV mainly in the older age group. It was concluded that EOP in this patient sample resembled that of western society.  相似文献   

2.
Of 49,380 male naval recruits who were screened for juvenile periodontitis (JP), 270 were clinically diagnosed as having the disease. Full-mouth radiographs identified 182 of these 270 patients as having JP with extensive bone loss on permanent first molars and/or incisors. These 182 patients, 137 (75.3%) of whom were black, were further classified into Type I: bone loss involving first molars and/or incisors and up to two additional teeth; Type II: involvement of first molars/incisors and several additional teeth; and Type III: generalized involvement (more than 14 teeth) but with bone loss notably more extensive on the first molars and/or incisors. Of the 182 patients, 129 (70.9%) were Type I; 43 (23.6%) were Type II, and 10 (5.5%) were Type III. The molars were involved more frequently than the incisors; more than one molar was always involved, with or without incisor involvement. Most cases had minimal or no radiographic caries, and 46% had demonstrable calculus. Of the remaining 88 cases from the 270 with the initial diagnosis of JP, 63 demonstrated severe bone loss on more than 14 teeth, with many of the teeth being involved to the same degree. These cases were termed rapidly progressive periodontitis. Six of the 88 cases had bone loss on only one tooth surface of the dentition. These cases were termed acute localized destruction of alveolar bone. The status of the other 19 cases could not be determined.  相似文献   

3.
The purpose of this study was to investigate radiographic features of the C-shaped canal system in mandibular second molars and their relationship to the canal anatomy by using intraradicular contrast medium and micro-computed tomography (microCT) scanning. Thirty mandibular second molars with fused roots were collected and stored in 10% formalin solution. After being scanned by microCT and reconstructed with 3-dimensional software, the pulp tissue of each tooth was removed mechanically and chemically. The contrast medium was introduced into the canal by using a specialized device, and the buccal-lingual radiograph was taken for each tooth. The radiographic images were classified into 3 types: Types I (merging type), II (symmetrical type), and III (asymmetrical type). The relationship between the radiographic and anatomic features was analyzed by collating the microCT scanned canal images with the radiographic types. The results were subject to Kruskal-Wallis test. Findings showed that 10 teeth were Type I, 10 teeth Type II, and 10 teeth Type III. Types I and III had more C1, C2 canal shape in their canal orifice, coronal, and middle canal portion than the Type II (P < .05). Types II and III had more C3a, C3b canal shapes in the apical canal portion than Type I (P < .05). On the basis of these results, the radiographic features revealed by the intraradicular contrast medium can help to identify the canal anatomy of C-shaped canal system in mandibular second molars.  相似文献   

4.
The aim of this study is to classify the nasal bone fractures based on computed tomography (CT) analysis and patterns of the nasal bone fractures, and review 503 cases treated between 1998-2004 at the Department of Plastic Surgery, Inha University Hospital, Incheon, South Korea.The age, sex, etiology, associated injuries, pattern of fractures and treatments were reviewed and a radiographic study was analyzed. Plain simple radiographs of lateral and Waters view of the nasal bones combined with computed tomography scans were done. Nasal bone fractures were classified into six types: Type I) Simple without displacement; Type II) Simple with displacement/without telescoping; IIA; Unilateral; IIAs) Unilateral with septal fracture; IIB) Bilateral; IIBs) Bilateral with septal fracture; Type III) Comminuted with telescoping or depression.Diagnosis of nasal bone fractures were made positively by plain x-ray films in 82% of cases, negative finding was 9.5% and 8.5% of cases were suspicious of the fractures. Reliability of the plain film radiographs of the nasal bone fracture was 82% in this study. In the most of the fractured nasal bones (93%) the closed reduction was done, open reduction in 4% and no surgical intervention in 3%. Nasal reduction was carried out in average 6.5 days post the injury. The patterns of the nasal bones fractures classified by CT findings were type IIA (182 cases, 36%), IIBs (105 cases, 21%), IIB (90 cases, 18%), IIAs (66 cases, 13%), I (39 cases, 8%) and III (21 cases, 4.3%).We think the CT is necessary for diagnosing nasal bone fracture because the reliability of the plain film was only 82%.  相似文献   

5.
The present study deals with the pathologic change of the mandible following radiation therapy for oral cancer, histopathologically and roentgenologically. The results are summarized as follows: 1) As the resorptive change of the cortex and the trabeculae, irregular and bizarre resorption and enlargement of the lacunae were observed, 2) The grade of injury of the osteocytes was described by the percentage of the number of the lacunae, which were empty and in which the nuclei of the osteocytes could not be seen. Consequently these results correspond considerably well with the clinical aspects. 3) Osteophytes in the spongy and compact bone were observed, and also narrowing and plugging of the Haversian canal and the canal of Volkmann with mineral were seen as the sclerotic change. 4) Thickening of the tunica intima, obstruction, disarrangement of the elastic fibers and distruption of the vessels were observed in the inferior alveolar artery, the arterioles, and also occlusion, which gave various appearances, in the vessels within the Haversian canal and the canal of Volkmann was seen. 5) The following four groups, based upon the radiographic change, were classified as: Group I, irregular osteolytic change; Group II, marked osteosclerotic change; Group III, irregular mixture of osteolytic and osteosclerotic change; and Group IV, no remarkable change.  相似文献   

6.
A clinical and statistical analysis on 180 patients with 58 maxillary and 147 malar fractures, treated at the hospital of the Nippon Dental University, School of Dentistry at Niigata, Department of Oral and Maxillofacial Surgery II from July 1974 to December 1992, was retrospectively perfomed. Of fifty five patients, 37 maxillary fractures and 36 malar fractures could not be classified into either Le Fort classification or Night and North type classification assessed by radiographic image. Based on this fact, preliminary type of classification was newly developed for these fractures, i.e., Type I: infra-mid-third facial fracture, Type II: lateral-midthird facial fracture, a; without dislocation or b; with dislocation, Type III: zygomatic bone fracture only. Type IV: supra-mid-third facial fracture. According to our new classification, the most of fractures could be clearly classified. Our new classification also provide in formation on the possible reappearance of clinical symptoms and an appropriate treatment plan.
  相似文献   

7.
Dentin dyslasia is a rare autosomal dominant hereditary variant of dentinogenesis imperfecta. The primary defect is mesodermal and involves the dentin. Two types (Type I and Type II) of dentin dysplasia have been described previously. The current case presents radiographic findings which include characteristics common to both types. It is proposed that either a third type (Type III) be recognized or the variability of the developmental defect precludes definitive subclassification.  相似文献   

8.
OBJECTIVE: The purpose of this study was to summarize the clinical manifestation, plain-film radiography, and computed tomographic (CT) scan features of arteriovenous malformations (AVMs) of the jaws on the basis of a series of 12 patients. STUDY DESIGN: This study group comprised twelve patients with AVM of the jaws from February 1996 to February 2001. Seven cases were located in the mandible, and 5 in the maxilla. Both plain-film radiography and CT scan were available for all cases. For the patients with lesions in the mandible, panoramic, posterioanterior, and lateral mandibular views were applied. Waters' position view and panoramic radiography were indicated for AVMs of the maxilla. RESULTS: Each patient with AVM of the maxillary bone had involvement of adjacent soft tissues. Various radiographic signs were noted, including erosion, coarse trabeculae, and apparent lack of any radiographic change, and CT scans featured cystic expansion of alveolar process with broken cortex. The radiographic signs and CT scan features of AVMs in the mandible were related to involvement of surrounding soft tissues. If involvement of the adjacent soft tissues was found, "soap bubble" radiolucency was shown radiographically and osteolytic expansion with perforation of cortex was present on CT scan. In cases without surrounding soft tissue involvement, the various radiographic signs included multilocular or unilocular radiolucency or coarse trabeculae; osteolytic expansions with intact cortex were found on CT scan. CONCLUSION: AVMs of the jaws showed intraosseous osteolytic expansion on CT scan but had variable appearance on plain-film radiographs.  相似文献   

9.
A clinical-radiologic-histopathologic review of 106 cases of fibrous dysplasia involving the jaws is presented. Ninety eight patients onset in the first and second decades.Fifteen cases were polyostotic and the remaining cases were were monstotic.Radiologicaly,the lesions showed and extending growth pattern,poor definite border and slight pattern,poor definite border and slight involvement of teeth.The radiographic features were classified into four types:ground grass (52.0%),sclerotic(8.0%),cystic-like(8.0%) and mixed type (32.0%).Histologically the lesions were characterized by a cellular fibrous stroma that contain varying amounts of mineralized substance,represented by woven bone(63.0%),lamellar bone(30.0%) and cementum-like structure(7.0%).The final definitive diagnosis requires the combined evaluation of clinic,radiologic and histopathologic findings.  相似文献   

10.
Healthy human gingival connective tissue appears to be arranged in two patterns of organization at the ultrastructural level: Pattern I (PI) and Pattern II (PII). PI is a dense pattern of organization mainly constituted of large, dense bundles of thick collagen fibers, whereas PII is a loose pattern of organization, mainly constituted of short, thin collagen fibers mixed with a fine reticular network, especially located under or around basement membranes. Ultrastructural immunoperoxidase labelling of types I, III, and IV collagen demonstrates that gingival connective tissue is made of an intricate pattern of type I and III collagen where type I collagen fibers are preferentially organized in large dense bundles in PI, whereas a fibrous and fibrillar type III collagen network is predominant in PII. Type IV collagen, which does not exist in fibrous or fibrillar form, appears to be the main collagenous component of the basement membranes.  相似文献   

11.
BACKGROUND: Recent histological evidence has documented that grafted palatal connective tissue is capable of forming a new attachment to previously exposed roots in the treatment of gingival recession. No clinical studies have tested the ability of connective tissue that has been implanted beneath the periosteum into periodontal osseous defects to reduce probing depth and increase clinical attachment levels. This study reports the long-term clinical effect of subperiosteal and intraosseous connective tissue grafts on deep periodontal pockets. METHODS: Connective tissue (CT) grafts were placed in 32 periodontal pockets on 27 patients. Grafts were classified into 3 groups. Type I grafts had 50% or more vascular surface contact and were < or = 2.5 mm thick. Type II grafts had 50% or more contact but were > 2.5 mm thick, and Type III grafts had less than 50% vascular contact regardless of thickness. Twelve of 14 Type I sites, 9 of 15 Type II sites, and 3 of 3 Type III sites were analyzed 9 to 13 years following treatment. RESULTS: Clinical attachment level change differed significantly between the graft types on survivor teeth (P < 0.05): Type III had 2 mm loss (95% confidence interval [CI]: 0.4 to 3.6), while Type II and Type I grafts had a 2.7 mm gain (95% CI: 2.0 to 3.4) and 4.3 mm gain (95% CI: 3.3 to 5.2), respectively. Similar substantial differences were presented for changes in probing depth and recession. CONCLUSIONS: This long-term (9 to 13 years) retrospective case-series analysis suggests substantial improvements in periodontal clinical measures for Type I CT grafts in deep periodontal pockets. Randomized trials are required to evaluate this promising procedure.  相似文献   

12.
The purpose of this study was to investigate the relation between the radiographic features of C-shaped mandibular second molars and the cross-sectional shapes of their root canal system. Fifty-eight extracted mandibular second molars with fused roots were collected from a native Chinese population. The teeth were scanned at 0.5-mm interval thickness by micro-computed tomography (microCT) and observed at 11 levels. The 54 teeth that possessed a C-shaped canal system were further examined. Their radiographic appearances were classified into three types according to discernible radiographic features. The results were subject to the Kruskal-Wallis statistical test. In these 54 molars, 16 teeth (29.63%) showed a type I radiographic image, 22 (40.74%) type II, and 16 (29.63%) type III. In the type I category, the C1 and C4 canal configurations were mostly found in the apical area. Categories C2 and C3 were the main configurations in the middle and apical areas in type II and III. The type III had more C2 canals in middle area than type II. These results suggested that it was possible to predict the presence and the configuration of C-shaped canal system by the radiographic appearance.  相似文献   

13.
目的分析颌骨动静脉畸形(AVM)的普通X线和数字减影血管造影(DSA)表现,并对其血管构筑分型,探讨该分型对颌骨AVM治疗的指导意义。方法分析25例颌骨AVM的普通X线和DSA表现,包括颌骨骨质改变、供血动脉、畸形血管团和引流静脉特点,从而对颌骨AVM的血管构筑分型。分析各型颌骨AVM的治疗史和疗效。结果25例颌骨AVM的DSA表现可分为5型:Ⅰ型:弥散型(5例),Ⅱ型:单静脉腔型(8例),Ⅲ型:弥散单静脉腔型(7例),Ⅳ型:多静脉腔型(2例),Ⅴ型:弥散多静脉腔型(3例)。DSA分型与普通X线表现具有很好的对应性。DSAⅡ~Ⅳ型治疗效果较好,17例均临床治愈(100%);DSA Ⅰ型和V型疗效较差,临床治愈的病例分别为3例(3/5)、1例(1/3)。结论颌骨AVM的血管构筑特点具有多样性,建议分为5型;该分型对颌骨AVM的治疗具有一定的指导意义。  相似文献   

14.

Objectives

To investigate the possibility of radiographic examination as a tool for differential diagnosis of bisphosphonate-related osteomyelitis of the jaw (BROMJ).

Methods

The radiographic findings of the mandibular lesions in 25 BROMJ patients were compared with those in 36 radiation osteomyelitis, 92 suppurative osteomyelitis, and 34 diffuse sclerosing osteomyelitis patients. The diagnostic criterion for BROMJ was osteomyelitis in patients with experience of bisphosphonate therapy. The amount and duration of bisphosphonate administration and presence and term of bone exposure were not considered for diagnosis.

Results

BROMJ revealed characteristic radiographic findings. Osteolytic change that started at the superficial layer of bone (cortical bone), followed by extension between the cortical and cancellous bone, large cancellous bone sequestrum formation often accompanied by extensive osteolytic change of the cortical bone or fairly large cortical bone sequestrum formation, and solid-type periosteal reaction formed at a site related to the margin of the remaining cortical bone were found to be pathognomonic, and were observed not only in cases with bone exposure but also in cases without bone exposure. A relationship between lamina dura thickening and the lesion was doubtful. Osteosclerotic change was frequent and remarkable, but not specific.

Conclusions

Radiographic examination was considered to be useful for differential diagnosis of BROMJ. Inclusion of the pathognomonic radiographic findings into the definition of BROMJ will make it possible to achieve earlier and more accurate diagnoses. In addition, the active bone remodeling in the lesions confirmed by radiography suggested that osteonecrosis was not the cause, but the result of infection.  相似文献   

15.
Three types of bone-single-crystal sapphire implant interfaces were histologically determined in submergible and supramergible implant: direct bone apposition (type I), thin connective tissue with poor collagen fibers (type II), and dense fibrous connective tissue (type III). Type I interface was predominant and type III interface was sparsely seen in submergible implants. In contrast to these findings, type III interfaces frequently appeared in supramergible implants, primarily at the apical region. These differences were considered to occur by the biomechanical variable of postoperative healing.  相似文献   

16.
OBJECTIVE: Fibrous dysplasia (FD) is a rare skeletal disease caused by activating GNAS1 gene mutations often found in association with the McCune-Albright syndrome (MAS). Multiple bones may be affected in FD, including maxilla and mandible. Patients with MAS have different endocrinopathies that can further influence bone metabolism. The purposes of this cross-sectional study are to characterize FD panoramic radiographic patterns, and to evaluate the effects of age, endocrinopathies and renal phosphate wasting on radiographic characteristics of maxillo-mandibular FD in MAS. SUBJECTS AND METHODS: Fifty-one consecutive MAS patients were screened and panoramic radiographs of 43 patients with craniofacial FD were evaluated and analyzed for FD involvement. Clinical chemistries were evaluated for associations between radiographic patterns and age, endocrinopathies or renal phosphate wasting using Fisher's Exact Test. RESULTS: Four types of radiographic changes were observed: ground glass (granular/condensed trabeculae), radiolucent (lytic), mixed radiolucent/radio-opaque (mixed density) or radio-opaque (sclerotic). Masking or displacement of the maxillary sinus (range: 77.8-86.4%) and mandibular canal (range: 55.6-75.0%) were prevalent in FD sites. Sixty-three percent of the MAS patients had multiple dysregulated endocrine/metabolic functions, the most common were hyperthyroidism, precocious puberty and renal phosphate wasting. There were no statistically significant associations between radiographic patterns and age, endocrinopathies or renal phosphate wasting. CONCLUSIONS: Maxillo-mandibular FD images in panoramic radiographs fall within a spectrum of four different patterns. Patients with facial asymmetry and any of these radiographic patterns should be promptly referred for further radiographic tests and endocrine evaluation if MAS is suspected.  相似文献   

17.
周洲  周耀  姜楠  于金华  张光东  孙超 《口腔医学》2013,(10):706-708
目的通过比较分析离体下颌第二恒磨牙C形根管的X线片和锥形束CT(CBCT)表现,为临床诊疗提供参考。方法收集我院因牙周病拔除的下颌第二恒磨牙110颗,模拟临床拍摄颊舌向X线片,并进行CBCT扫描。统计C形根管的发生率及其类型。结果 110颗离体下颌第二恒磨牙中,通过X线片诊断为C形根管的46颗(41.81%),通过CBCT影像确诊为C形根管显示66颗(60.00%)。通过CBCT诊断为C形根管的离体牙中,其中Ⅰ类(融合型)26颗,Ⅱ类(对称型)22颗,Ⅲ类(不对称型)18颗。Ⅰ类中,C4截面形态主要在根管下段出现的频率较高,Ⅱ类中,C3在整个根管各段中出现的频率较高。Ⅲ类中,C1和C2主要出现在根管上段。结论具有C形根管的下颌第二磨牙基本可以通过X线片初步诊断,但如需了解其根管的详细信息则要通过CBCT扫描分析。  相似文献   

18.
The aim of this study was to update the midpalatal suture classification after surgically assisted rapid maxillary expansion (SARME) using computed tomography (CT). Thirty-five patients with a transverse maxillary deficiency and unilateral or bilateral posterior crossbite underwent SARME with osteotomy of the pterygoid apophysis of the sphenoid. CT was performed before installation of the Hyrax expander appliance and after the final activation. Opening of the midpalatal suture was classified into three types: type I, total midpalatal suture opening from anterior nasal spine (ANS) to posterior nasal spine (PNS); type II, partial midpalatal suture opening from ANS to the transverse palatine suture, with partial or non-existent opening of the midpalatal suture posterior to the transverse palatine suture; type III, complete maxillary opening from ANS, but not of PNS, because a paramedian fracture completed the opening of the hard palate. Type I was observed in 42.8% of the patients, type II in 40%, and type III in 17.2%. Opening of the transverse palatine suture was found in all midpalatal suture opening patterns and was more frequent in type III, followed by type II and type I. CT was used to update the classification of midpalatal suture patterns, with the inclusion of type III: total opening of the hard palate due partly to opening of the midpalatal suture and partly to a paramedian fracture.  相似文献   

19.
的研究不同错类型患者下前牙区牙厚度与垂直骨面型和矢状骨面型的关系。方法选取恒牙列初期错畸形患者168例,其中男性93例,女性75例。根据垂直骨面型和矢状骨面型将患者分为9组,对其X线头影侧位片上的下前牙槽根尖区牙槽厚度进行测量,并采用SPSS 13.0统计软件对测量结果进行方差分析和两两比较。结果不同垂直骨面型患者下前牙区牙槽厚度的差异有统计学意义(P<0.05),低角组厚度最大,其次为均角组,高角组最小。高角组下前牙槽根尖区牙槽较窄,低角组较厚。在高角、均角、低角各组内部,骨性Ⅰ、Ⅱ、Ⅲ类患者牙槽厚度的差异均无统计学意义(P>0.05)。均角Ⅲ类患者下前牙区牙槽厚度较小,与高角Ⅰ、Ⅱ、Ⅲ类患者牙槽厚度的差异无统计学意义(P>0.05);低角Ⅲ类患者与均角Ⅰ、Ⅱ类患者牙槽厚度的差异也无统计学意义(P>0.05)。结论下前牙区牙槽厚度与垂直骨面型密切相关,与矢状骨面型关系不明显。  相似文献   

20.
目的:研究无外源性生长因子作用下,应用体外培养扩增的骨髓基质干细胞(BMSCa)-改良藻酸钙凝胶混合物修复大鼠颅骨缺损的可行性。方法:取同基因大鼠的BMSCa,经体外分离培养扩增,与改良藻酸钙凝胶混合后充填颅骨缺损。在不损伤硬脑膜的情况下,切除全层颅骨,造成动物标准缺损。用含或不含BMSCs的改良藻酸钙凝胶充填颅骨缺损,无充填物缺损作为空白对照,将颅骨缺损分为3组:第1组(n=6),空白对照组;第2组(n=6),缺损处仅置藻酸钙,第3组(n=6),BMSCs-改良藻酸钙复合增强,而第1组与第2组均无新的钙化灶。组织学显示第1、2组在缺损边缘骨变薄,少量骨向内生长,致密纤维组织和藻酸钙充填于腔隙。BMSCs-改良藻酸钙组有大量的新生骨、植入的BMSCs-改良藻钙在缺损处自行生长。结论:移植同基因BMSCs-藻酸钙复合物可促使骨骼再生,在骨缺损者还可有效再生骨。因此,自体BMSCs-改良藻酸钙凝胶移植是治疗各种骨缺损颇有希望的方法。  相似文献   

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