大学生第三磨牙萌出、排列和咬合状况调查

目的：探讨第三磨牙萌出、排列及咬合的特点。方法：17、18、19岁大学生295人（男240人,女55人）,取研究模观察。结果：①样本中第三磨牙萌出率为27．46％,3个年龄组间及在口腔内4个区的分布之间均未见明显差异（P＞0．05）。②在萌出的216个第三磨牙中,萌出异常主要为阻生（见于下颌,占26．39％,P＜0．01）和因对颌牙缺如而过度萌出（占18．98％）。③26．13％的上颌第三磨牙为颊向位,明显多于下颌第三磨牙的10．38％（P＜0．01）。④与对颌有咬合接触关系的第三磨牙共58例91侧,其中咬合异常者35例56侧,即第三磨牙咬合异常的发生率是11．86％。结论：第三磨牙萌出、排列及咬合关系等异常均有较高比例,其临床意义有待深入研究。     

Self-reported chewing side preference and its associations with occlusal, temporomandibular and prosthodontic factors: results from the population-based Study of Health in Pomerania (SHIP-0)

Summary  This study investigated the prevalence of a preferred chewing side (PCS) and associations between a PCS and signs of temporomandibular disorders (TMD), antagonist contact and prosthetic restoration. A population representative sample of 4086 adults of the cross-sectional epidemiologic 'Study of Health in Pomerania' (SHIP-0) (age range 20–80 years, female 50·2%) was divided in two groups by the presence or absence of a PCS. PCS was evaluated by a questionnaire. Chi-squared tests and multiple logistic regression were used to determine the impact of the relation between a PCS and signs and symptoms of TMD as well as dental factors. The prevalence of a PCS was 45·4%. Women between 40 and 69 years reported more frequently a PCS. There was a preference for the right side (64%). The following independent variables were significantly associated with a PCS: subjective unilateral pain in the temporomandibular joint (TMJ), odds ratio (OR) 2·4; subjective unilateral joint clicking, OR 1·7; unilateral TMJ/muscle pain on palpation, OR 1·6/OR 1·3; loss of one supporting zone (Eichner-Classification), OR 1·9; loss of both supporting zones on one side, OR 2·2, one supporting zone left, OR 1·4; presence of a removable partial denture, OR 1·6; presence of an attachment restoration, OR 1·5. A PCS was found in almost half the study population and was associated with unilateral signs of TMD, most of all TMJ pain and asymmetrical loss of antagonist contact. Despite replacement of lost teeth not all restorations seemed to support bilateral mastication.     

The relationship between the occlusal interference side and the symptomatic side in temporomandibular disorders

This study aimed to investigate the relationship between the facial side of pain or clicking symptoms and the side of occlusal interference, and to examine the features of pain and clicking patients in terms of frequencies of occlusal interferences in relation to the symptomatic side. Occlusal conditions in 31 pain patients and 40 clicking patients were investigated just after the relief of pain or clicking solely by means of bite plane therapy. The symptomatic side did not associate with the side of fewer occlusal contacts in intercuspal position, no canine contact on the working side, occlusal contact on the non-working side, or unilateral contact in retruded contact position. The results of this study suggest that pain or clicking does not necessarily tend to appear on the side of these occlusal interferences. Additionally, characteristic inclination for pain and clicking patients in terms of frequencies of occlusal interferences in relation to the symptomatic side was not identified.     

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目的研究不同耳点选择对头影测量值的影响并探讨其相关因素。方法选择2003年7月至2007年7月于中国医科大学口腔医学院正畸科就诊的青春发育高峰期后的105例患者头颅定位侧位片,分别采用机械耳点和解剖耳点定位眶耳平面,配对研究不同眶耳平面与下颌平面、上颌平面和面平面所成角度的差异,并分析不同错类型及不同性别之间机械耳点和解剖耳点的垂直距、水平距的差异。结果机械耳点和解剖耳点定位眶耳平面与下颌平面、上颌平面和面平面所成角度差异均有统计学意义,不同错类型及不同性别在机械耳点和解剖耳点的垂直距、水平距上差异无统计学意义。结论机械耳点和解剖耳点的位置存在明显差异,在头影测量分析中不能混用。     

在校学生颞下颌关节紊乱病与心理因素关系的研究

目的:探讨心理因素对在校生颞下颌关节紊乱病(TMD)的影响.方法:对52例14～ 26岁确诊为颞下颌关节紊乱病(TMD)及53名健康在校生进行颞下颌关节紊乱病专科检查,并填写症状自评量表(SCL-90).患者组分为咀嚼肌功能紊乱(MD)组26例、关节盘移位(TD)组14例、关节盘移位咀嚼肌功能紊乱并存(MD+TD)组12例,按病程分为急性组32例(病史≤6个月),慢性组20例(病史＞6个月).用SPSS 17.0对各分组SCL-90总分及因子分进行比较分析.结果:TMD组SCL-90总分及各因子得分高于健康对照组(P＜0.05).MD组得分与TD组得分差异无统计学意义(P＞0.05),MD+ TD组的SCL-90总分及除抑郁、恐怖和精神病性外的其他因子得分显著高于前2组(P＜0.05).急性组躯体化得分高于慢性组(P＜0.05),其他项目2组差异无统计学意义(P＞0.05).TMD患者SCL-90总分与疼痛等级呈正相关关系.结论:心理因素对患TMD的在校生影响显著,可影响TMD相关疼痛的程度,对在校生的TMD进行治疗时应考虑心理的相关治疗.