Influence of procedural variations during the laboratory phase of complete denture fabrication on patient satisfaction and denture quality

Objectives

To compare subjective and objective outcomes of complete dentures fabricated with standard clinical protocols, but omitted selected steps during the laboratory phase.

Materials and methods

Forty-three edentulous patients (mean age 58.1 years, SD 9.9, range 35–78), were consecutively recruited and randomly assigned to one of four groups according to selected variations of laboratory steps: Group 1 (n = 10), omission of secondary casts obtained from impressions in border moulded custom trays; Group 2 (n = 10), omission of secondary casts and face-bow articulator mounting; Group 3 (n = 10), omission of face-bow mounting; Group 4 (n = 13), no steps omitted (control). Clinical procedures for all groups were identical, and performed by senior dental students under supervision of prosthodontists, all of whom were blinded to the Group. At 1-, 4- and 12-weeks after delivery, patients rated their overall satisfaction, as well as a range of functional factors using visual analogue scales. An independent blinded prosthodontist similarly rated four domains of denture quality at the 1-week follow-up.

Results

No significant differences were noted among the groups in all aspects of patients’ assessments at all the time points (P > 0.1). There were no significant differences in prosthodontists’ ratings of denture quality in any of the domains examined (P > 0.1).

Conclusion

Selected omissions of steps (face-bow mounting and/or secondary casts) during the laboratory phase of complete denture fabrication has only a minor role, if any, in subjective and objective outcomes, contrasting with the common belief that such omissions will adversely affect outcomes.

Clinical significance

General practitioners provide most complete dentures. Many do not follow all the procedures they were taught at dental school. Our finding that omitting frequently advocated steps made no difference to patient satisfaction or to denture quality suggests that cost-effectiveness through simplifications be considered in practice and in education.     

Influence of high expansion dental stone used as investing medium on the changes in occlusal vertical dimension of complete dentures

Problem statementDespite advances in materials and techniques, complete dentures made of acrylic resin experience an increase in the occlusal vertical dimension (OVD) during processing. Many factors that affect the OVD of complete dentures are known. However, no study has examined the effect of using high-expansion dental stone (type V) as an investing material on the OVD.PurposeThis study investigated the effects of using a high-expansion dental stone as an investing material on changes in the OVD of complete dentures.Material and methodsTwenty sets of simulated upper and lower dentures were processed by the compression molding technique. Specimens were equally divided into 2 groups. In the dental stone type III (DST III) group, the lower, middle, and upper parts of a flask were filled with DST III. In the dental stone type V (DST V) group, the procedure was the same as in the DST III group, except that the middle layer was made of high-expansion DST V. Changes in the OVD were measured before and after denture processing. Collected data were analyzed with t-test statistics. Differences were considered statistically significant at the 95% confidence level.ResultsBoth groups showed a small increase in the OVD as a result of processing, but the OVD increase was significantly less in the DST V group compared to the DST III group.ConclusionHigh-expansion DST V can be recommended as an investing material to reduce the increase in the OVD that may occur while processing complete dentures.     

回结肠血管为人路标志的腹腔镜辅助下右半结肠根治术24例报告

目的探讨回结肠血管为人路标志的腹腔镜辅助右半结肠根治术的难点及处理。方法2009年1月～2012年1月对24例结肠癌行腹腔镜辅助右半结肠根治术。按肿瘤处理原则,内侧人路,结扎相应血管,清扫淋巴结,并通过小切口在腹腔外进行切除吻合。结果24例均成功完成手术,无中转开腹。手术时间136～200min,平均150min。术中出血15～200ml,平均40ml。清扫淋巴结12～25枚,平均17枚。辅助切口4～7cm,平均5cm。术后住院6～9d,平均7d。除1例术后切口液化感染外,无其他切口或穿刺口并发症发生,无肠漏及腹腔感染等发生。18例随访6～24个月,平均12个月,2例发生肝转移,其余患者未见有肿瘤复发或转移。结论正确选择后腹膜切开点,有利于肠系膜上静脉游离和融合筋膜间隙的分离;正确理解全结肠系膜切除、熟知胃结肠干的解剖变异,是减少术中出血和顺利完成规范化手术的成功要点。     

Residual ridge resorption, lower denture stability and subjective complaints among edentulous individuals

Residual ridge resorption in the mandible after tooth loss may lead to worsening of complete denture stability and to various subjective complaints. The aim was to evaluate the association between radiologically assessed residual ridge resorption in the mandible, clinically assessed stability of lower complete denture and subjective complaints among elderly denture wearers. The study population consisted of 326 (115 men and 211 women) edentulous subjects aged 60-78years, all of whom were wearing complete dentures in the mandible. Data on subjective complaints were obtained from questionnaires and interviews. Denture stability was assessed clinically. Residual ridge resorption was analysed from panoramic radiographs. The results showed that women were significantly more often satisfied with their lower dentures and reported fewer problems with eating than men. They also had significantly more often residual ridge resorption than men. Among women, residual ridge resorption was significantly associated with poor chewing ability, low satisfaction with dentures and poor denture stability. Among men, residual ridge resorption did not associate with subjective complaints or denture stability. Poor satisfaction with dentures associated significantly with poor denture stability in both genders. In conclusion, these results highlight the importance of denture maintenance treatment. As the extent of residual ridge resorption in the mandible was the most important factor that increased dissatisfaction with lower complete dentures, it is also important to inhibit the progression of resorption by preventing tooth loss or by using implant-retained dentures.     

不同类型雄激素不敏感综合征性腺肿瘤临床分析

目的:探讨完全型雄激素不敏感综合征(CAIS)与不完全型雄激素不敏感综合征(IAIS)患者的性腺肿瘤发生情况及临床特征,以进一步提高对该病的认知水平与诊治。方法:回顾性分析2001年1月至2015年3月北京协和医院妇产科收治的雄激素不敏感综合征(AIS)78例患者的临床资料及性腺病理检查结果。结果:78例AIS患者中,CAIS 52例,IAIS 26例。共14例(17.9%,14/78)患者存在性腺肿瘤,年龄14~33岁,肿瘤类型包括:性腺母细胞瘤(2例)、支持细胞腺瘤(8例)、精原细胞瘤(1例)、无性细胞瘤(1例)和性索肿瘤(1例)、左侧性腺精原细胞瘤及右侧支持细胞腺瘤(1例)。发生肿瘤的性腺位于腹盆腔9例,腹股沟管5例。14例性腺肿瘤患者诊断为CAIS12例和IAIS 2例,其性腺肿瘤的发生率分别为23.1%和7.7%,差异有统计学意义(P0.05)。结论:AIS患者性腺易发生肿瘤,非阴囊内部位的性腺易发生性腺肿瘤。CAIS的性腺肿瘤发生率较高。     

腹腔镜下右半结肠全系膜切除术

患者为老年男性,临床分期为c T4N0M0,术后病理分期为p T4aN1M0。采用"四步法":1.沿肠系膜上静脉走向充分显露肠系膜上静脉,整块清除外科干淋巴结、胰头前及第6组淋巴结,进入并分离胰十二指肠前间隙。2.进一步扩大胰十二指肠前间隙并游离右肾前间隙至右结肠旁沟,沿此间隙游离升结肠及回盲部后方。3.切开回结肠反折腹膜及升结肠侧腹膜。4.切除右侧大网膜、第6组淋巴结,切开肝结肠韧带。腹腔镜下操作完成。     

前扣带皮层区域磷酸激酶Czeta在弗氏安全佐剂致炎性痛大鼠情绪反应中的作用

目的 观察CFA致炎性痛模型大鼠的情绪反应,探讨前扣带皮层（ACC）磷酸激酶Czeta（PKCzeta）与炎性痛大鼠情绪反应的关系。方法 24只清洁级雄性SD大鼠随机分为空白对照组和模型对照组。足底皮下注射弗氏完全佐剂建立慢性炎性痛模型。动态观察各组大鼠造模前（base）、造模后3、7、14、21和28 d的体重和痛阈变化;观察造模后14、21、28 d所有大鼠在高架O迷宫中的总运动距离、开放臂运动距离、开放臂进入次数和开放臂停留时间百分比。观察造模后14、29 d所有大鼠在旷场中的总运动距离、中央象限运动距离、中央象限进入次数和中央象限停留时间。采用免疫印迹法检测造模后14 d和29 d健侧和患侧ACC区域PKCzeta蛋白表达。结果 各个时间点两组大鼠体重差异无显著性（P>0.05）。造模前,两组大鼠痛阈差异无显著性（P>0.05）;造模后1 d,模型对照组大鼠痛阈显著降低（P<0.05）,且在整个实验过程中均显著低于空白对照组（P<0.05）。与空白对照组比较,模型对照组大鼠于模后28 d开放臂运动距离和开放臂停留时间百分比显著减少（P<0.05）,于模后29 d中央象限运动距离和中央象限进入次数明显减少（P<0.05）。造模后29 d,模型对照组大鼠患侧ACC区域PKCzeta蛋白表达明显多于空白对照组（P<0.05）。且开放臂运动距离、开放臂停留时间百分比、中央象限运动距离、中央象限进入次数与患侧PKCzeta蛋白表达变化呈负相关。结论 CFA诱导的慢性炎性痛大鼠可出现异常情绪行为;慢性炎性痛情绪样行为可能与ACC区域PKCzeta的高表达相关。     

改进的大鼠单发佐剂性关节炎模型的建立和实验观察

本实验用油包水型完全弗氏佐剂（ＣＦＡ）进行大鼠单侧踝关节腔内注射，制备出一种音发性关节炎模型，对此模型动物进行的实验观察表明：注药侧踝关节在注药后几小时即开始出现急性红肿，３周后肿胀稳定于一定水平，保持６周以上；注药侧踝关节的屈、伸关节疼痛试验评分明显升高，踝关节坟痛阈值显著降低，即出现了明显的患侧痛敏，并可稳定持续几周。注射佐剂后第４周和第６周进行Ｘ线检测显示：注射ＣＦＡ的踝关节关节囊肿胀，关节     

全结肠系膜切除应用于腹腔镜辅助右半结肠癌根治术的安全性及疗效分析

目的探讨全结肠系膜切除在腹腔镜右半结肠切除术中的安全性及短期疗效。方法回顾性分析北京大学肿瘤医院胃肠肿瘤微创外科2009年4月至2011年11月连续收治的70例右半结肠癌患者的临床资料。结果共有65例行腹腔镜全结肠系膜切除右半结肠癌切除术患者纳入研究,全组患者手术时间120～285（中位时间185）min,术中出血量30～150（中位50）ml;中位淋巴结清扫数24枚／例;术后并发症发生率9．2％（6／65）,术后中位排气时间3d,术后住院时间7d。无30d内再住院患者及死亡患者。全组患者的2年总生存率为98．5％,2年无病生存率为83．1％。结论在腹腔镜右半结肠切除术中应用全结肠系膜切除技术．可以达到肿瘤的根治性完整切除：且可发挥腹腔镜手术术中出血少、术后恢复快的优势,并未增加手术风险,术后短期随访疗效良好。     

完整结肠系膜切除术与传统根治术治疗结肠癌的效果比较

目的比较完整结肠系膜切除术（CME）与传统根治术治疗结肠癌的临床效果。方法选取92例结肠癌患者,根据治疗方法将其分为观察组（CME治疗）与对照组（传统根治术治疗）,各46例。比较两组的手术时间,术中出血量,术后排气时间、并发症发生情况;随访1年,比较两组的复发率。结果两组的手术时间差异无统计学意义（P〉0.05）,观察组的术中出血量显著少于对照组,术后排气时间显著短于对照组（P〈0.05）;观察组的淋巴结清除数显著多于对照组（P〈0.05）;观察组的术后并发症发生率为6.52%,显著低于对照组的17.39%（P〈0.05）;观察组的1年复发率为2.17%,显著低于对照组的13.04%（P〈0.05）。结论相对于传统根治术,对结肠癌患者采用CME治疗能更好地清除淋巴结,且术后并发症较少,复发率较低,值得推广。