应用牙周动度仪研究戴用可摘局部义齿对基牙动度的影响

本研究使用Periotest牙周动度检测仪，对38名牙列缺损患者在用可摘局部义齿（RPD）修复前后分别作基牙动度的测量。结果表明，义齿修复后基牙的稳固程度有提高趋势。     

Functional mobility measurement of removable partial dentures using newly-developed analyzing system in six degrees of freedom--effect of cusp inclination of molar artificial teeth on denture displacement in function]

A measuring system to record three-dimensional displacement of removable partial dentures (RPDs) in six degrees of freedom has been developed. The system employed three pairs of photodiode and LED that were set up in a triangle. This system was capable of recording the in vivo RPD displacement with a recording sensitivity of 0.1 mm. In vivo displacement of upper RPDs with unilateral distal extension saddle was investigated using this measuring system to determine the effect of artificial cusp inclination of molar teeth on denture mobility. Two groups of different artificial dentition were switched to be attached to each of three experimental RPDs. The artificial teeth with cusp inclinations were calibrated to contact with opposing natural dentition during lateral grinding of the mandible, while the other artificial teeth were prepared to disclude with the mandibular teeth (flat-cusp group). Displacement range and average position of a reference point at the first molar of the RPDs during mastication were measured and analyzed as a function of the cusp inclination and the test food. As a result, the average displacement of the RPDs toward the edentulous ridge was smaller in the cusp group than that in the flat-cusp group, while the range of horizontal displacement in the buccal-palatal direction was greater in the former group than the latter. The denture wearers demonstrated typical grinding strokes at the end of the closing phase of the mandiblar movements when they chewed a peanut, which was attributed to a wide range of horizontal displacement of the dentures.     

Denture mobility and bolus position during mastication in patients wearing conventional and pelotte-retained full upper dentures: a cineradiographic study

With cineradiographic technique an assessment was made of the denture mobility of conventional and pelotte dentures in the upper jaw and of the position of the bolus during chewing of meat and bread. Five randomly selected edentulous patients with moderate alveolar ridge resorption rehabilitated with dentures of conventional design, and another five with dentures furnished with subnasal retentive pelottes, were incorporated in the study. Cineradiographic registrations were made in lateral and frontal projections with a picture frame speed of 38/s. Analysis of the cineradiographic films revealed only small differences for the denture mobility for the two patient groups. This indicated in the patients with severe ridge resorption, an obvious reduction of denture displacement through the use of the nasal pelotte or prong. The displacement was of similar magnitude as for those dentures where an alveolar ridge creates effective retention and limitation of horizontal movements. The analyses of the bolus position during chewing gave the information that in all individuals wearing pelotte dentures, the bolus was positioned more distally, than for patients with conventional dentures. Presumably this was in order to reduce discomfort in the frontal region, i.e. the region of the pelottes. Patients with conventional dentures showed a more even distribution of the bolus to all regions.     

Denture modification during adjustment phase of complete denture service

Records were kept on the adjustment phases of treating 64 patients with new complete dentures. Five dentists treated the patients independently of each other. All dental laboratory procedures were performed by the same dental laboratory technician under the same conditions.     

软衬基托全口义齿的固位与力研究

目的 研究比较软衬基托全口义齿与传统全口义齿的固位力和（牙合）力,以评价弹性软托全口义齿的治疗效果,以期为临床的软衬治疗提供理论依据。方法 选择10名牙槽嵴欠丰满的全口义齿患者为受试对象,以SoftReverse软衬材制作软衬义齿基托,分别测试他们戴软衬基托和传统基托义齿时的固位力及（牙合）力,进行自身对照分析。结果 所有患者戴弹性软基托义齿时的固位力和（牙合）力均明显高于戴传统基托时的相对应测试值。结论 从咀嚼功能和戴牙舒适的角度上说,弹性软衬基托全口义齿明显地优于传统基托全口义齿。     

Denture stabilization with peralveolar tubing.

Mock dentures were stabilized in six monkeys by means of polyethylene tubings passed through surgically created buccolingual peralveolar channels. Macroscopic, radiographic, and microscopic examinations demonstrated that the dentures were stabilized and the tubings well tolerated throughout the 120-day study period.     

Denture stomatitis with multiple intramucosal fistulae

Abstract – A hitherto undescribed clinical and histologic entity occurring in the palate of 13 denture-wearing patients is described. Clinically it is characterized by the presence of small yellowish areas in the hard palate, which on pressure yield a whitish creamy material through multiple openings. The surrounding mucosa may exhibit various degrees of erythema. The histologic changes are characterized by the presence of intramucosal fistulae lined with unkeratinized squamous epithelium. The content of the fistulae, which corresponds to the creamy material expelled, consists of desquamated epithelial cells. These changes have mostly been nodced in elderly females, all wearing maxillary dentures for many years. This entiPf is considered a type of demure stomatitis characterized by intramucosal proliferation of epithelium, possibly because of long-standing chronic irritation from dentures. The origin of the intramucosal fistulae is unknown. The fistulae are believed to originate either from the ductus of the minor salivary glands or from the surface epithelium of the palate.     

Fabrication of a Duplicate Denture From an Existing Complete Denture

A technique is presented that describes the fabrication of a duplicate denture using the patient's existing complete denture. This procedure enables the practitioner to offer patients an alternative to being without a denture during a laboratory reline of an existing denture. A vinyl polysiloxane impression material is used to impress the polished surface of the existing denture as well as to block out undercuts on the impression surface of the denture before pouring a stone cast. Because of the stability of the impression material used, most of the laboratory procedures can be accomplished separate from the clinical appointment.     

Compliance of Resilient Denture Liners Immersed in Effervescent Denture Cleansers

PURPOSE: Six resilient denture liners (RDL) were exposed to two immersion effervescent denture cleansers to evaluate change in compliance over a simulated 1 year time interval. MATERIALS AND METHODS: Ten samples of each material, Molloplast B, Mollosil, MPDS-SL, Permasoft, Softline, and Sofreliner were exposed to either Fixodent or Efferdent denture cleanser. A cyclic load was applied in a squarewave fashion to derive a load displacement curve to measure compliance at 0, 7, 30, 180, and 360 simulated days. RESULTS: All 12 of the material/cleanser combinations demonstrated a significant change in compliance at each time interval relative to baseline. Mollosil had the greatest increase in flexibility from baseline, and MPDS-SL had the smallest increase in flexibility. In general, chairside materials demonstrated greater change in compliance from baseline compared to laboratory materials. Materials subjected to Fixodent cleanser, when averaged over time, were significantly more flexible than materials exposed to Efferdent cleanser. CONCLUSIONS: Exposure of resilient soft liners to two common cleansers resulted in a significant increase in flexibility. This change in flexibility depended slightly, though significantly, on the type of cleanser, and appeared to be more significant with time. In general, chairside materials seemed to change more than laboratory-processed liners. The exception was Permasoft that was fabricated as a laboratory material but behaved like a chairside material. CLINICAL SIGNIFICANCE: The initiator of the polymerization reaction rather than the mode of polymerization may be more important in predicting a change in the flexibility of RDLs. Constituents within the oral environment may be more responsible for changes in RDL flexibility than denture cleansers.     

Reinforcement of Denture Base Resin with Glass Fillers

PURPOSE: This study evaluated the effect of short glass fibers on the transverse strength of a heat-polymerized acrylic resin denture base material. MATERIALS AND METHODS: Four groups of specimens (n = 10) were fabricated according to the ISO standard for the transverse strength test. E-glass fibers were triturated to produce short fibers of different lengths. Specimens for Group 1 (control) were made of unfilled polymethylmethacrylate (PMMA). For group 2, the PMMA powder was modified with 0.1 g of dry glass fibers. For group 3, the PMMA powder was modified with 0.1 g of silanized glass fibers. For group 4, the PMMA powder was modified with 0.2 g of silanized glass fibers. A three-point loading test was used to determine the transverse strength of the tested specimens. The fracture surface of each specimen was evaluated using SEM. RESULTS: The addition of untreated glass fibers increased the transverse strength by 11% but produced some porosity in the polymeric matrix. The addition of silane-treated glass fibers increased the transverse strength of PMMA by 28% for group 3 and by 26% for group 4, and produced a dense structure for the polymer-fiber composite. CONCLUSION: The transverse strength of PMMA can be slightly increased by the addition of short glass fibers.     

弹性吸盘用于上颌全口义齿修复的临床观察

目的探讨弹性吸盘对上颌全口义齿满意度的影响。方法选择43例因固位条件差致上颌全口义齿固位不良的患者,使用弹性吸盘重新行上颌全口义齿修复。于吸盘式义齿修复前、吸盘式义齿修复后1、3、6个月及1年、1年半、2年进行满意度调查,用SPSS13.0统计软件分析满意率。结果完成2年随访的35例患者,与使用弹性吸盘式义齿前相比,使用后6个时间点义齿固位效果的满意率都有明显提高,差异有统计学意义（χ2=46.667、52.500、62.432、58.947、55.641、62.432,P〈0.05）,使用后1个月与以后5个时间点固位效果的满意率差异无统计学意义（χ2=0.402、2.040 1、1.867、0.971、1.867,P〉0.05）;使用后义齿咀嚼功能的满意率明显提高,差异有统计学意义（χ2=11.667、46.667、52.500、55.641、62.432、58.947,P〈0.05）,使用后3个月与以后4个时间点的咀嚼功能满意率差异无统计学意义（χ2=0.402、0.971、2.040、1.867,P〉0.05）;使用前与使用后1个月义齿舒适性的满意率差异无统计学意义（χ2=0.238,P〉0.05）;使用后1个月与使用后3个月的舒适性满意率差异有统计学意义（χ2=10.189,P〈0.05）,使用后3个月的满意率提高。结论因固位条件差而致上颌全口义齿固位不良的患者,弹性吸盘式义齿修复是经济、便捷、有效的修复方式。     

Denture stomatitis with multiple intramucosal fistulae.

A hitherto undescribed clinical and histologic entity occurring in the palate of 13 denture-wearing patients is described. Clinically it is characterized by the presence of small yellowish areas in the hard palate, which on pressure yield a whitish creamy material through multiple openings. The surrounding mucosa may exhibit various degrees of erythema. The histologic changes are characterized by the presence of intramucosal fistulae lined with unkeratinized squamous epithelium. The content of the fistulae, which corresponds to the creamy material expelled, consists of desquamated epithelial cells. These changes have mostly been noticed in elderly females, all wearing maxillary dentures for many years. This entity is considered a type of denture stomatitis characterized by intramucosal proliferation of epithelium, possibly because of long-standing chronic irritation from dentures. The origin of the intramucosal fistulae is unknown. The fistulae are believed to originate either from the ductus of the minor salivary glands or from the surface epithelium of the palate.