Dewel’s Method Of Serial Extraction
Write short note on Dewel’s method of serial extraction.
Answer.
Dewel’s method of serial extraction
Dewel proposed a three step serial extraction procedure in 1978. This is the most satisfactory order in most patients even today.
“Understanding Dewel’s method in orthodontics”
Dewel’s method of serial extraction
Step 1: Extraction of Deciduous Canines
- In this step, the deciduous canines are extracted at around 8–9 years to create space for the alignment of the incisors.
- The main objective of extracting primary canines is to establish the integrity of upper and lower incisors. This prevents the development of lingual crossbite of maxillary laterals and resultant mesial migration of maxillary canines.
“Timing of tooth extraction in Dewel’s method”
Step 2: Extraction of Deciduous First Molars
- In this step, deciduous fist molars are extracted when first premolars reach half of the root length as evidenced by radiographs. This would be some 12 months after the extraction of deciduous canines at around 9–l0 years of age.
- The objective of deciduous fist molar extraction is to accelerate the eruption of fist premolars. This ensures that the fist premolars emerge into oral cavity, before the eruption of permanent canines.
serial extraction in orthodontics
“Impact of severe crowding on Dewel’s extraction decision”
Step 3: Extraction of First Premolars
- In this step, first premolars are extracted as they are emerging into oral cavity and when the permanent canines have developed beyond half of the root length.
- Extraction of fist premolars facilitates proper eruption and alignment of permanent canines.
- After serial extraction procedure, the teeth are fairly aligned. However, the establishment of proper intercuspation\usually requires orthodontic mechanotherapy of minimal duration, although it may not be necessary in some cases.
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