Correlation between articular eminentia and the depth of glenoid fossa

The possibility of a correlation between the inclination of the articular eminentia and the depth of the glenoid fossa of the temporomandibular joint was studied in 95 students (52 females and 43 males), with an average age of 22 years. A significant correlation was found when the whole material was analysed and when subjects with Angle's Class I occulsion were analysed separately. No significant correlation was found in subjects with an Angle's Class II occlusion. Class III occlusions were not studied.     

成人下颌骨舌下腺窝形态的分析研究

目的:对成人下颌骨舌下腺窝解剖形态进行分析,为下颌后牙区进行牙种植手术时提供参考。方法:采用多层螺旋CT扫描成像方法,对60例离体成人下颌骨标本扫描,测量和分析下颌骨舌下腺窝解剖形态特点。结果:60例下颌骨标本中下颌骨舌下腺窝形态可分为4类,下颌骨舌下腺窝骨倒凹最深点集中在第二前磨牙或第一磨牙的根尖下方。结论:下颌骨舌下腺窝在人群中解剖结构变异较大,在下颌后牙区进行牙种植手术时应考虑舌下腺窝的解剖特点。     

Non-traumatic pneumocephalus caused by increased depth of olfactory fossa

We report a case of unilateral Keros type III variant of the cribriform plate (olfactory fossa >7 mm deep) that caused non-traumatic pneumocephalus. A 61-year-old male patient presented to the emergency room complaining of acute-onset headache after blowing his nose. Computed tomographic (CT) examination showed a massive pneumocephalus; a CT scan from three months before showed a Keros type III variant. The defect was repaired endoscopically with mucoperichondrial and mucoperiostal grafts. Pneumocephalus that has developed in a Keros type III variant has been theorised about, but never reported to our knowledge. Radiologists should be familiar with the Keros classification so that they can identify patients who are at increased risk of fractures of the cribriform plate.     

Comparison of condylar displacement after sagittal split ramus osteotomy depending on the glenoid fossa depth

This study aimed to evaluate the relationship between postoperative condylar displacement (PCD) after sagittal split ramus osteotomy (SSRO) and the glenoid fossa depth. A total of 29 patients who underwent computed tomography (CT) before surgery (T0), immediately after (T1), and 6 months after (T2) surgery were studied. The fossa depth was measured, and the amount of displaced condylar center and axis were evaluated on CT at T0, T1, and T2 using three-dimensional analysis software. PCD and the fossa depth relationship was investigated by Pearson's correlation analysis. The fossa depth varied from 3.9 mm to 12.0 mm, and the mean value was 8.15 ± 1.60 mm. The condylar center was displaced by 1.12 ± 0.66 mm at T1 compared with it at T0. The amount of displaced condylar center negatively correlated with the fossa depth (r = ?0.424, p = 0.001). The displacement of the condylar center between T0 and T2 was 0.85 ± 0.51 mm. The amount of condylar center displacement between T0 and T1 showed a positive correlation with it between T0 and T2 (r = 0.481, p < 0.001). In conclusion, more attention is needed in patients with small fossa depth during condylar repositioning after SSRO and postoperative management to minimize complications.     

A bilateral, superficial location of human sublingual glands: report of a case

During a routine dissection of a cadaver, the unusual, completely superficial position of both sublingual glandular masses was noticed. Histologically, the glandular masses consisted of a group of minor sublingual glands. It is suggested that the existence of a wide gap between the anterior and posterior parts of the mylohyoid muscle, which was revealed during further dissection, was the primary embryologic anomaly that was responsible for the unusual location of the glands.     

Associations between the location of the glenoid fossa and its remodeling. An experimental study in the rabbit.

The growth of the glenoid fossa is assumed to follow that of the cranial base. It has been observed recently that distal displacement in association with an obtuse cranial base angle is reduced on remodeling of the fossa anteriorly as a consequence of a more anterior position of the condyle in the fossa. The aim of this investigation was to simulate the increased distal displacement experimentally by causing a premature artificial cranial synostosis. Ten 10-day-old rabbits underwent gluing of the interparietal and temporoparietal sutures. These and ten controls were killed at 50 days for examination, and the articular surface of the right glenoid fossa was marked with a soft metal wire. The skulls were roentgenographed in standardized lateral projection. The articular surface was significantly shallower in relation to the skull base in the experimental group, and the glenoid fossa was located more superiorly and posteriorly. The most likely reason for the more horizontal direction of the articular surface is the more anterior location of the condyle, exerting increased pressure on the eminence. This becomes important, as it has recently been shown that in rabbits this shallowing of the fossa is associated with increased forward growth of the mandible.     

翼腭窝、颞下窝肿瘤手术治疗

目的:回顾总结颞下窝、翼腭窝肿瘤的手术治疗的方法及效果。方法:2004～2007年我院翼腭窝、颞下窝肿瘤患者18例,其中良性肿瘤患者5例,恶性肿瘤患者13例。术前影像学检查判断肿瘤位置及良、恶性,选择手术进路、切除范围,酌情用组织瓣填充术腔,术后行放疗或化疗,随访3月～3年。结果:5例良性肿瘤患者随访6个月～3年,无1例复发。13例恶性肿瘤患者随访3个月～3年,生存期不足1年5例,生存期1.5～2年2例;6例生存期超过3年,且未见肿瘤复发、转移。结论:对翼腭窝、颞下窝肿瘤手术治疗应注意其诊断及手术方法特点。     

Fracture of the glenoid fossa and dislocation of the mandibular condyle into the middle cranial fossa

Reported cases of dislocation of the mandibular condyle into the middle cranial fossa have been rare, and treatment modalities have varied. The case presented represents an instance of successful closed reduction. Numerous factors should be considered when determining the technique of reduction. Primary goals in selecting the method of treatment are stabilization of the neurologic status, control of the bone fragments in the brain, reduction of the occlusion, maintenance of ramus height for facial symmetry, preservation of growth potential, and assurance of satisfactory long-term function of the mandible.     

基于CBCT对下颌管位置的测量分析

目的：应用CBCT对正常人群下颌管在第二前磨牙及第一、二磨牙根尖处位置的测量,来确定其正常位置关系。方法：测量120例18岁以上正常人群第二前磨牙及第一、二磨牙根尖处位置的3个距离：①下颌管中心（ A）到下颌骨下缘最下点（ B）的距离;②下颌管中心（ A）到与A点在同一水平线的颊侧点（ C）的距离;③下颌管中心（ A）到与A点在同一水平线的舌侧点（ D）的距离。每个距离测量3组,取其平均值。结果：男性第二前磨牙根尖处的下颌骨下缘骨壁最厚,其舌侧骨壁厚于颊侧骨壁。在第一磨牙及第二磨牙处,下颌骨下缘骨壁、舌侧骨壁、颊侧骨壁均增厚,且颊侧骨壁厚于舌侧骨壁;女性测量结果及规律与男性相同,其骨壁厚度略较男性骨壁为薄。结论：利用这3个空间距离来确定正常人下颌管在第二前磨牙及第一、二磨牙根尖处的位置,对正颌手术中下颌骨矢状劈开术,囊肿刮治术,种植术等提供理论依据。     

Rare giant epidermal cyst in the infratemporal fossa and middle cranial fossa

A 50-year-old man presented with a rare giant crossing cranium-temporal combined epidermal cyst. Physical examination found left facial numbness and temple severely numbness with light pressure. Horizontalis craniocerebral computed tomography demonstrated a mass lesion of 3.0 × 2.0 cm in the middle cranial fossa area; sagittal craniocerebral magnetic resonance scanning demonstrated a mass consisting of 2 leaves (the upper one, 4.0 × 3.0 cm; the lower one, 2.0 × 1.5 cm). Computed tomography angiography showed that the blood supply of the lesion came from superficial temporal artery and middle cranial fossa artery. The clinical diagnosis was neurilemmoma. Surgery revealed a pearly cyst consisting of 2 leaves (connected by a narrowed bridge located at the articular fossa of temporal bone) was 6 × 3 × 3 cm. Histologic examination disclosed disintegrated keratinizing epithelium layer, keratinizing epithelium layer, and stratified squamous epithelium layer from inner to outer and found no hair follicles or sebaceous gland with the diagnosis of epidermoid cyst. Surgery was successfully performed, and the patient was discharged home with severer left facial numbness relatively and left jaw slight opening. The present case suggests that epidermoid cysts can be seen in any location, even giant crossing cranium-temporal combined lesion, and the blood supply should be considered as a factor judging its pathogenesis.     

Mucinous adenocarcinoma of the sublingual gland

A case of mucinous (colloid) adenocarcinoma of the sublingual gland is reported. Adenocarcinomas associated with large pools of extracellular mucin are extremely rare in the major salivary glands. Analysis of the tumor for cytokeratin expression, estrogen and progesterone receptors was performed. Predominantly, the tumor expressed cytokeratins 7, 8, 18 and 19 that are commonly found in simple epithelia, and to a lesser degree cytokeratins 4 and 13 which are usually found in complex epithelia. Staining for estrogen and progesterone receptors was negative. No other cancer has been detected for three years after the first examination. The tumor is considered to be a primary mucinous adenocarcinoma of the sublingual gland.     

Schwannoma arising from the sublingual glandular branch of the lingual nerve radiologically masquerading as sublingual gland tumor

Oral Radiology - We report a rare case of schwannoma arising from the sublingual glandular branch of the lingual nerve radiologically masquerading as sublingual gland tumor. A 42-year-old female...     

对新一代Florida探针临床测量可重复性和舒适度的评价

目的：评价新一代Florida探针测量牙周袋深度的可重复性和舒适度。方法在基础治疗后3个月维护期内,选择35例牙周炎患者为研究对象,2位检查者先后使用普通探针与Florida探针重复测量每个位点的探诊深度各2次,分别比较2种探针测量牙周袋探诊深度的可重复性,及2位检查者使用同1种探针测量牙周袋探诊深度的可重复性。应用视觉模拟评分法,比较患者接受2种探针检查时的舒适度。结果新一代Florida探针与普通牙周探针测量的牙周袋探诊深度重复性均良好（P>0.05）,浅袋和中袋的可重复性比深袋更好（P<0.05）。但在不同测量者之间Florida探针可重复性略优于普通牙周探针（P<0.05）,且比使用普通牙周探针让患者感觉更舒适（P<0.05）。结论新一代Florida探针可可靠的在慢性牙周炎维护期患者的临床研究中使用。     

A technique of measurement of the depth of the vestibular fornix in the mandibular anterior region.

A radiographic method of measurement of the depth of labial vestibule in the mandibular anterior region has been described. Contrast medium was applied to the lip and mucobuccal fold and radiopaque marker attached to the labial surface of each tooth. The head was positioned in a craniostat and a posterior-anterior radiograph exposed. The radiopaque boundaries of the vestibule showed on the radiograph so that they could be measured. Statistical analysis showed a recording error of 0.6 mm and an observation error of 0.29 mm, which are within the range of error acceptable for this type of recording technique.     

The sublingual and submandibular spaces

A variety of cystic masses arise in the sublingual and submandibular spaces. These include ranulas, dermoid cysts, branchial cleft cysts, thyroglossal duct cysts, cystic hygromas, cystic hemangiomas, cystic neurogenic tumors, lipomas, and abscesses. MRI and CT of representative cases are presented here, and characteristics that provide important clues to differential diagnosis are described.     

电子牙周探针在牙植体周围组织探诊检查中的应用

目的研究电子牙周探针在牙种植体和自然牙的探诊深度检查的可重复性,评价其在检查种植体周围组织健康状况中的应用价值。方法对48例患者54颗种植体的324个位点和54颗对照同名自然牙的324个位点用电子牙周探针分别间隔1小时检查探诊深度两次,将自然牙和种植体检查位点按探诊是否出血分为炎症组和健康组,比较两次探诊深度检查的可重复性。结果种植体炎症组两次探诊深度分别为2.97±1.24mm和3.25±1.35mm（X±S）,第二次检查的探诊深度大于第一次的探诊深度,差异有统计学意义（P〈0.05）。其它各组比较均未见差异的显著性。结论电子压力探针在自然牙和牙种植体健康位点的探诊检查中有较好的可重复性,但用于种植体周围组织炎症位点的探诊检查时,其可重复性有所下降,评价种植体周围组织的炎症发展情况时应同时参考其它检查指标。