Misch Carl E
Clinical Professor and Director, Oral Implantology, Temple University, Philadelphia, PA.
J Prosthodont. 2008 Feb;17(2):130-134. doi: 10.1111/j.1532-849X.2007.00259.x. Epub 2007 Oct 30.
The purpose of this pilot study was to evaluate the relationship between the vertical position of the maxillary central incisal edge and the maxillary canine relative to the maxillary lip line in repose of dentate patients. This may be beneficial for clinicians in establishing guidelines for the rehabilitation of edentulous patients.
One hundred and four Caucasian dentate patients (59 men and 45 women) between the ages of 30 and 59 years were evaluated. A millimeter ruler was used to measure the maxillary right central incisor edge and the maxillary right canine tip to the maxillary lip in repose. Data were collected in reference to sex and age.
For the female group, average central incisor exposure in relation to the relaxed maxillary lip line was 3.8 mm, and the range of exposure was -1 to +8 mm. In the 30- to 39-year olds (17 patients), the average was 4.1 mm with a range of 0 to 8 mm. The average in the 40- to 49-year-old group (16 patients) was 2.8 mm with a range of -1 to +6 mm. In 50- to 59-year olds (12 patients), the average was 1.8 mm with a range of -1 to +5 mm. In the male group, the average central incisor exposure was 2.5 mm, and the range was -3 to +7 mm. The average for the 30- to 39-year-old group (20 patients) was 3.2 mm with a range of 0 to 7 mm. For the 40- to 49-year group (18 patients), the average was 2.4 mm and for 50 to 61 years (21 patients), it was 1.4 mm with a range of -3 to +5 mm in both latter age groups. The canine position for the female group average exposure was 0 mm, with a range of -2 to +2 mm. For the 30- to 39-year old group, average exposure was 1 mm with a range of -1 to +2 mm. The 40- to 49-year-old group exposed an average of 0.4 mm with a range of -1 to +2 mm. For the 50- to 59-year old group, canine exposure was -0.5 mm with a range of -2 to +1 mm. The male average canine exposure was -0.5 mm, and the range was -3 to +2 mm. For the 30- to 39-year old group, the average was 0.9 mm with a range of -1 to +2 mm. The 40- to 49-year-old group exposed an average of 0.2 mm, with a range of -1 to +2 mm. For the 50- to 59-year old group, average was -0.9 mm with a range of -2 to +1 mm.
There was a large range of maxillary central incisal exposure in relation to the maxillary lip line. The average dimension of central incisor exposure represented less than 30% of the subjects in the study and could not be used predictably to assess incisal edge position. The range of canine exposure was narrower. The average dimensions of canine exposure to the lip were within 1 mm for both men and women in all age groups. Further studies are needed to confirm these preliminary results. The average dimensions for the different sex and age groups related to canine exposure represented a greater proportion of the subjects. Therefore, it is suggested that the average canine exposure dimension can be used clinically to assess anterior incisor edge position when restoring edentulous patients.
本初步研究旨在评估牙列完整患者在自然状态下上颌中切牙切缘及上颌尖牙相对于上颌唇线的垂直位置关系。这可能有助于临床医生制定无牙颌患者修复的指导原则。
对104名年龄在30至59岁之间的白种牙列完整患者（59名男性和45名女性）进行评估。使用毫米尺测量自然状态下上颌右侧中切牙切缘及上颌右侧尖牙牙尖至上颌唇的距离。根据性别和年龄收集数据。
女性组中，相对于上颌自然唇线，中切牙平均暴露量为3.8毫米，暴露范围为-1至+8毫米。在30至39岁组（17名患者）中，平均为4.1毫米，范围为0至8毫米。40至49岁组（16名患者）平均为2.8毫米，范围为-1至+6毫米。50至59岁组（12名患者）平均为1.8毫米，范围为-1至+5毫米。男性组中，中切牙平均暴露量为2.5毫米，范围为-3至+7毫米。30至39岁组（20名患者）平均为3.2毫米，范围为0至7毫米。40至49岁组（18名患者）平均为2.4毫米，50至61岁组（21名患者）平均为1.4毫米，后两个年龄组的范围均为-3至+5毫米。女性组尖牙位置平均暴露量为0毫米，范围为-2至+2毫米。30至39岁组平均暴露量为1毫米，范围为-1至+2毫米。40至49岁组平均暴露量为0.4毫米，范围为-1至+2毫米。50至59岁组尖牙暴露量为-0.5毫米，范围为-2至+1毫米。男性尖牙平均暴露量为-0.5毫米，范围为-3至+2毫米。30至39岁组平均为0.9毫米，范围为-1至+2毫米。40至49岁组平均暴露量为0.2毫米，范围为-1至+2毫米。50至59岁组平均为-0.9毫米，范围为-2至+1毫米。
相对于上颌唇线，上颌中切牙的暴露范围较大。中切牙暴露的平均尺寸在研究对象中所占比例不到30%，不能用于可靠地评估切缘位置。尖牙暴露范围较窄。在所有年龄组中，男性和女性尖牙暴露于唇的平均尺寸均在1毫米以内。需要进一步研究来证实这些初步结果。不同性别和年龄组与尖牙暴露相关的平均尺寸在研究对象中所占比例更大。因此，建议在修复无牙颌患者时，尖牙暴露的平均尺寸可用于临床评估前牙切缘位置。
