• 作者： 陳坤智; 陳瑞松; 張心涪
• 作者服務機構： 國立臺灣大學醫學院牙醫學系
• 中文摘要： 以國小一至六年級學童，男生281名、女生278名，計559名六至十二歲之中國人為研究對象，利用口內掃描照相機拍攝上、下顎齒列照片，據以觀察齒列弓幅徑在幼年期問之成長變化趨勢。 結果顯示齒列弓寬徑，特別是在上顎者有逐年增寬之勢。犬齒間寬徑之增加時期，約略與切齒與犬齒之乳恆齒交替時期一致。上顎齒列弓之犬齒間寬徑與臼齒間寬徑之增長，皆大於下顎齒列所見。 至於齒列弓深徑之變化，僅在恆中切齒萌出時期略有增加，乳大齒與乳臼齒脫落繼之恆犬齒與小臼齒萌出後，齒列弓臼齒部深徑則有逐漸減短之傾向，尤以下顎齒列為然。
• 英文摘要： In order to observe the growth and develop-ment of Chinese dentition in primary schoolchildren, 281 boys and 278 girls aged between6 years and 12 years were submitted for thestudy. Intraoral scanning photographs of themaxillary and mandibular dentitions were takenwith a Unitek Orthoscan II Camera on eachsubject. These photographs were used fordetermining the dental stage and for measuringthe width and depth dimensions of the dentalarches. The data obtained were analyzed todetect the mean trends of growth changes in thedental arch dimensions on the cross-sectionalbasis. The mean total increments of the dentalarch dimensions during the age span studiedwere summarized in the following： Dimensions boys girls1. canine width: maxillary: 4.74 mm 4.63 mm mandibular: 2.23 mm 2.14 mm2. molar width: maxillary: 3.52 mm 2.83 mm mandibular: 1.04 mm 1.54 mm3. canine depth: maxillary: 1.73 mm 1.77 mm mandibular: 1.50 mm 1.17 mm4. molar depth: maxillary: 1.64 mm 0.91 mm mandibular:-1.49 mm-1.03 mm Where the negative values denote the meantotal decrement. Present findings indicate that the dentalarch widths, especially of the maxillary arch,increased with age. The periods of increase inthe canine width coincided approximately withthe time during the incisor and canine transitionfrom deciduous to permanent teeth. The divergedmaxillary alveolar processes in contrast to thealmost vertical alveolar processes of the mandi-ble might account for the greater gain in themolar width at the maxillary dental arch thanthat at the mandibular dental arch. The dentalarch depths increased only when the deciduousincisors were replaced by the permanent incisors.On the other hand, the greater mesiodistaldimensions of the deciduous canine and molarsthan those of their permanent successors, inter-dental spacings existed between deciduous teethand the mesial migration of the permanentmolars tended to decrease the dental archdepths during the transitional stage particularyin the mandibular arch.
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