CAJ | 학술논문

目的测量正常(牙合)成年人硬腭部骨质厚度,以期为腭部支抗种植体的安全植入提供基础数据.方法选择32名正常(牙合)、无正畸治疗史的成年人(男性16人,女性16人),年龄(30.1±6.5)岁.拍摄锥体束CT(cone beam computerized tomography,CBCT),以经过切牙孔后缘的冠状线为基线,向后与(牙合)平面垂直、与基线平行、在正中矢状线上每隔3 mm对硬腭部进行重建,选取7个与(牙合)平面垂直的冠状面,第1层为切牙孔后缘冠状面,第7层为距离切牙孔后缘18 mm的冠状面.在每个冠状面上确定位于正中矢状线上的腭中缝点为M点,左右侧硬腭水平部最外缘点为D点,均分M点与D点连线为4等份,从内到外依次命名为A、B、C点.测量各点对应处硬腭部骨质厚度.结果硬腭部第1～7层骨质厚度的差异有统计学意义,骨质厚度从前向后逐渐递减;最厚处为12.6 mm,位于第1层冠状面D点;最薄处为2.7 mm,位于第7层冠状面B点;第2、3层冠状面骨质厚度最高为10.5 mm,最低为5.8 mm.硬腭部左右两侧骨质厚度差异均无统计学意义(P＞0.05).结论正常(牙合)成年人硬腭部距切牙孔后缘6 mm内可植入长度为5～10 mm的支抗种植体.
목적 측량정상(아합)성년인경악부골질후도,이기위악부지항충식체적안전식입제공기출수거.방법 선택32명정상(아합)、무정기치료사적성년인(남성16인,녀성16인),년령(30.1±6.5)세.박섭추체속CT(cone beam computerized tomography,CBCT),이경과절아공후연적관상선위기선,향후여(아합)평면수직、여기선평행、재정중시상선상매격3 mm대경악부진행중건,선취7개여(아합)평면수직적관상면,제1층위절아공후연관상면,제7층위거리절아공후연18 mm적관상면.재매개관상면상학정위우정중시상선상적악중봉점위M점,좌우측경악수평부최외연점위D점,균분M점여D점련선위4등빈,종내도외의차명명위A、B、C점.측량각점대응처경악부골질후도.결과 경악부제1～7층골질후도적차이유통계학의의,골질후도종전향후축점체감;최후처위12.6 mm,위우제1층관상면D점;최박처위2.7 mm,위우제7층관상면B점;제2、3층관상면골질후도최고위10.5 mm,최저위5.8 mm.경악부좌우량측골질후도차이균무통계학의의(P＞0.05).결론 정상(아합)성년인경악부거절아공후연6 mm내가식입장도위5～10 mm적지항충식체.
Objective To investigate the palatal bone thickness in adult with normal occlusion Methods The cone beam computerized tomography records of 32 adults with normal occlusion ( 16 males and 16 females), mean age (30. 1 ±6. 5) years, were used to measure the bone thickness at midpalatal area and the right and left palatal sides. Coronal slices at 3 mm intervals were generated. Slice 1 was the coronal slice through the posterior border to the incisive foramen, while Slice 7 was the coronal slice 18 mm away from the incisive foramen. At each coronal slice, the midpalatal sites were Site M and the sites on the exterior margin of the hard palatal were Site D. Four equally divided parts on the line linking Site M to Site D were named Site A, B, C from the interior to the exterior respectively. Palatal bone thickness were measured at these sites. Results Significant differences were noted from Slice 1 to Slice 7, the bone thickness of palate tended to decrease from the front to the back. The thickest site at hard palatal was 12. 6 mm, locating at Site D of Slice 1, while the thinnest site was 2. 7 mm, locating at Site B of Slice 7.The palatal bone thickness ranged from 10. 5 mm(maximum) to 5. 8 mm(minimum) at Slice 2 and Slice 3. No statistical significance was found between the left and right sides ( P ＞ 0. 05 ). Conclusions The favorable sites for miniscrew placement were the anterior region of the hard palate in adult. The length of miniscrew ranged from 5 mm to 10 mm can be placed from 6 mm posterior to the incisive foramen.