這是DR. milo hellman於1932年提出的分類法,他是以dental age的生長來做區分

 hellman's dental age

其分類的方式為以下

I A    before eruption of deciduous tooth

I C    before attained of deciduous occlusion

II A  completion of deciduous tooth occlusion

IIC   beginning of eruption of 1st molars and incisors

III A completion of eruption of 1st molars and incisors

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III B  exchanging of lateral dentitions

III C  beginning of eruption of second molars

IV A  completion of eruption of the second molars

IV C  beginning of eruption of third molars

V A completion of eruption of third molars

 

 

 

Change of Pulp Cavity in Maxillary Incisors by the Dental Age (日本明海齒學學報)

Oral findings in Noonan syndrome: report of a case(Journal of Oral Science, Vol. 45, No. 2, 117-121, 2003)

Dentocraniofacial Morphology of 12 Japanese Subjects With Unilateral Cleft Lip and Palate With a Severe Class III Malocclusion: A Cephalometric Study at the Pretreatment Stage of Surgical Orthodontic Treatment

Maxillary protraction effects of TTBA (Tandem TractionBow Appliance) therapy in Korean Class III children

Skeletal Characteristics and Treatment Outcome of Five Patients with Robin Sequence

Skeletal Changes of Maxillary Protraction in Patients Exhibiting Skeletal Class III Malocclusion: A Comparison of Three Skeletal Maturation Groups

dependence of craniofacial growth on stages of cervical vertebral maturation and stages of mandibular canine mineralization

asymmetry in the condylar long axis and 1st molar rotation

An Epidemiologic Study on the Orthodontic Patients Who Visited Department of Orthodontics, Chosun University Dental Hospital Last 10 Years(1990~1999).

Title Morphological Study on Quadruplets by Cephalometric and model analysis(TDC,TOKYO DENTAL COLLEGE)

Early versus late treatment of crowded first premolar extraction cases: Postretention evaluation of stability and relapse

Functional Treatment of Condylar Process Fractures in Children

Can Cephalometric Indices and Subjective Evaluation Be Consistent for Facial Asymmetry?(The Angle Orthodontist)

THE NOT-SO-HARMLESS MAXILLARY PRIMARY FIRST MOLAR EXTRACTION

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