Jasinevicius T R, Pyle M A, Lalumandier J A, Nelson S, Kohrs K J, Türp J C, Sawyer D R
Case School of Dental Medicine, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106-4905, USA.
Cranio. 2006 Apr;24(2):85-94. doi: 10.1179/crn.2006.014.
The purpose of this study was to assess the degree of right-left asymmetry of the glenoid fossa. The specific aims were (1) to determine whether there were relationships between age, number of teeth, slope of the articular eminence, fossa depth, and the degree of right-left asymmetry, and (2) to compare the right-left asymmetry of two populations, one characterized by an acceptable occlusion (A-Occ), the other by an unacceptable occlusion (partially edentulous; Un-Occ). A-Occ was defined as possessing a minimum of 28 teeth that would allow for hand articulation of the mandibular teeth to the maxillary teeth. Un-Occ had fewer than 17 teeth, which would make it impossible to articulate the mandible with the maxilla. The sample included 20th century dry skulls: 70 African-American (44 male, 26 female) and 64 European-American (49 male, 15 female), ranging in age from 21-105 (mean 47.1 +/- 19.9). The medial (M), central (C), and lateral (Lat) aspects of the right (R) and left (L) slopes of the articular eminence were measured in a sagittal plane. The R and L fossa depth also were measured. The raw absolute differences IR-LI and relative differences [IR-LI/IR+Llx100] of the articular slope angles (M, C, and Lat) and fossa depths were computed. Statistical analysis included paired t-tests, independent t-tests, and Pearson's correlation coefficients, significance at p < or = 0.05. Ninety percent (90%) of the population exhibited right-left asymmetry of the glenoid fossa. The right articular slopes (M, C, and Lat) were significantly steeper than the left articular slopes; the right fossa depths were significantly deeper than the left. There generally were no differences in the articular slope steepness or fossa depths between the partially dentate and the dentate, nor were there statistical differences between the two groups in the raw absolute differences or relative differences of the M, C, and Lat slopes or fossa depths. No significant relationships were found between right-left asymmetry, age, or number of teeth. With only 10% of the subjects exhibiting symmetry of the glenoid fossa depths or articular slope angles, clinicians should consider bilateral asymmetry the norm and not an anomaly.
本研究的目的是评估肩胛盂左右不对称的程度。具体目标为：（1）确定年龄、牙齿数量、关节结节斜率、盂窝深度与左右不对称程度之间是否存在关联；（2）比较两组人群的左右不对称情况，一组具有可接受的咬合（A-Occ），另一组具有不可接受的咬合（部分无牙；Un-Occ）。A-Occ定义为拥有至少28颗牙齿，这使得下颌牙齿能够与上颌牙齿手动咬合。Un-Occ的牙齿少于17颗，这使得下颌与上颌无法咬合。样本包括20世纪的干燥头骨：70例非裔美国人（44例男性，26例女性）和64例欧裔美国人（49例男性，15例女性），年龄范围为21 - 105岁（平均47.1 +/- 19.9）。在矢状面测量关节结节右侧（R）和左侧（L）斜率的内侧（M）、中央（C）和外侧（Lat）方面。还测量了R和L盂窝深度。计算关节斜率角（M、C和Lat）和盂窝深度的原始绝对差值IR-LI和相对差值[IR-LI/IR+Llx100]。统计分析包括配对t检验、独立t检验和Pearson相关系数，显著性水平为p <或= 0.05。90%的人群表现出肩胛盂的左右不对称。右侧关节斜率（M、C和Lat）明显比左侧关节斜率更陡；右侧盂窝深度明显比左侧更深。部分有牙和有牙人群之间在关节斜率陡度或盂窝深度上通常没有差异，两组在M、C和Lat斜率或盂窝深度的原始绝对差值或相对差值上也没有统计学差异。在左右不对称、年龄或牙齿数量之间未发现显著关联。由于只有10%的受试者表现出肩胛盂深度或关节斜率角的对称性，临床医生应将双侧不对称视为常态而非异常。
