Itoh I, Su M J, Saitoh H, Tamatsu Y, Abe T, Hori H, Fujimura A, Nozaka Y
Department of Oral Anatomy I, Ohu University School of Dentistry, Koriyama, Japan.
Bull Tokyo Dent Coll. 1995 Aug;36(3):145-58.
The development and significance of the postglenoid process on the articular surface of the temporal bone were studied using 217 Indian skulls, which were divided by their level of tooth eruption into 6 developmental stages; preeruption period (Stage I), initial stage (m1 eruption) of the deciduous dentition period (Stage II), middle stage (m2 eruption) of the deciduous dentition period (Stage III), late state (eruption of 20 deciduous teeth) of the deciduous dentition period (Stage IV), mixed dentition period (Stage V), and permanent dentition period (Stage VI). Each skull was mounted on a Kraniophor in such a way that the auriculoorbital (Frankfurt) plane was positioned vertical to the horizontal plane and photographed at a focal distance of 40 cm. Using the Frankfurt plane as a base line, the vertical distances to the lowest point of the postglenoid process (a-A), to the deepest point of the mandibular fossa (b-B), and to the mid-point of the articular tubercle (c-C) were measured. The distances from various points of the mandibular fossa to the articular surface of the temporal bone were measured at the level of the Frankfurt plane. The results may be summarized as follows: The length of the postglenoid process as measured from the Frankfurt plane was 0.58 mm at Stage I and 0.75 mm at Stage II. It increased by 0.6-1.0 mm at each developmental stage. By Stage VI, it had increased to 3.85 mm (six- to seven-fold increase from the initial value). The anteroposterior width of the postglenoid process remained almost unchanged throughout the developmental stages. The growth of the articular structures of the temporal bone from the preeruption to deciduous dentition period increased 73% in the total anteroposterior dimension (5.22 mm) and 44% in the total vertical dimension (3.32 mm). The vertical dimension of the mandibular fossa began to rapidly increase following the eruption of the deciduous first molars.
利用217个印度颅骨研究了颞骨关节面上关节后结节的发育及其意义。这些颅骨根据牙齿萌出程度分为6个发育阶段：萌出前期（I期）、乳牙列期初期（m1萌出，II期）、乳牙列期中期（m2萌出，III期）、乳牙列期后期（20颗乳牙全部萌出，IV期）、混合牙列期（V期）和恒牙列期（VI期）。每个颅骨以这样的方式安装在头颅固定架上，即耳眶（法兰克福）平面与水平面垂直，并在40厘米的焦距下拍照。以法兰克福平面为基线，测量到关节后结节最低点（a - A）、下颌窝最深点（b - B）以及关节结节中点（c - C）的垂直距离。在下颌窝的各个点到颞骨关节面的距离在法兰克福平面水平进行测量。结果总结如下：从法兰克福平面测量的关节后结节长度在I期为0.58毫米，在II期为0.75毫米。在每个发育阶段增加0.6 - 1.0毫米。到VI期，它增加到3.85毫米（比初始值增加了六到七倍）。关节后结节的前后宽度在整个发育阶段几乎保持不变。从萌出前期到乳牙列期，颞骨关节结构的生长在总前后尺寸（5.22毫米）上增加了73%，在总垂直尺寸（3.32毫米）上增加了44%。下颌窝的垂直尺寸在乳牙第一磨牙萌出后开始迅速增加。
