What is Leeway space of Nance?

Dr Teeth
14 Aug 201703:48
EducationalLearning
32 Likes 10 Comments

TLDRThe video script discusses the concept of leeway space in dentistry, specifically during the second transitional period when permanent teeth replace deciduous ones. It explains that this extra space, known as Nance's leeway space, varies between the mandibular and maxillary arches and is crucial for the mandibular molar to drift mesially, aiding in establishing a class 1 molar relationship. The video aims to educate viewers on the significance of this space in dental development.

Takeaways
  • 🦷 The second transitional period refers to the time when deciduous teeth are replaced by permanent ones, specifically the canine and premolars.
  • 📈 During this period, the permanent successors require less space than the deciduous teeth they replace, resulting in extra room in the mouth.
  • 👈 The exfoliation of deciduous teeth and the eruption of permanent teeth follow a specific sequence, which can be viewed in the linked video.
  • 📚 The term 'leeway space of Nance' refers to the extra space created in the dental arch during the second transitional period.
  • 📏 The leeway space is greater in the mandibular arch compared to the maxillary arch, with 3.4 mm versus 1.8 mm respectively.
  • 🌟 The leeway space is significant as it allows the mandibular molar to drift mesially (move towards the center of the mouth).
  • 🦴 The mesial drift of the mandibular molar helps to establish a class 1 molar relationship, which is a desirable alignment in orthodontics.
  • 🔗 The video provides a visual explanation and a link to additional resources for understanding the eruption sequence of permanent teeth.
  • 📢 The speaker encourages viewers to engage with the content by commenting, subscribing, and sharing the video with others.
  • 🙏 The video concludes with a message of gratitude and an encouragement to stay connected for more informative content.
Q & A

  • What is the second transitional period in dental development?

    -The second transitional period is the stage during dental development when the deciduous (baby) canine and molar teeth are replaced by permanent canines and premolars.

  • Why is less space required for the permanent successors of deciduous teeth?

    -Less space is required for the permanent successors because the space occupied by the deciduous teeth is larger than the space needed for the permanent teeth that replace them, resulting in extra room or leeway space.

  • What is the significance of the leeway space of Nance?

    -The significance of the leeway space of Nance is that it allows for the mandibular molar to drift mesially (towards the midline of the jaw), which helps establish a class 1 molar relationship, contributing to proper alignment and occlusion.

  • How is the leeway space different between the mandibular and maxillary arches?

    -The leeway space is greater in the mandibular arch than in the maxillary arch. Specifically, the mandibular arch has 3.4 mm of leeway space (1.7 mm on each side), while the maxillary arch has 1.8 mm (0.9 mm on each side).

  • What role does the sequence of exfoliation play in dental development?

    -The sequence of exfoliation plays a crucial role in ensuring that deciduous teeth are lost in a specific order to make way for the eruption of permanent teeth according to their natural timing, which is critical for maintaining proper alignment and spacing in the dental arch.

  • Why is it important for the mandibular molar to drift mesially?

    -The mesial drift of the mandibular molar is important for establishing a class 1 molar relationship, which is considered an ideal occlusion where the buccal groove of the mandibular first molar aligns with the mesiobuccal cusp of the maxillary first molar, ensuring proper bite and jaw alignment.

  • What happens to the extra space created by the smaller size of permanent successors to deciduous teeth?

    -The extra space, known as leeway space, is utilized by the mandibular molar to drift mesially, aiding in the establishment of an ideal molar relationship and contributing to the overall proper dental arch alignment.

  • How does the video help viewers understand the eruption sequence of teeth?

    -The video provides an explanation of the eruption sequence, potentially through animations or graphics, and offers additional resources like links to more detailed videos on the topic, making it easier for viewers to understand the complex process of tooth eruption.

  • What educational value does the video offer to its audience?

    -The video offers educational value by explaining the concept of leeway space in dental development, the importance of tooth eruption sequence, and the physiological changes associated with the transition from deciduous to permanent teeth, enhancing understanding of dental health.

  • How does the creator of the video engage with the audience?

    -The creator engages with the audience by encouraging comments, subscriptions, and shares, offering additional resources like links to related videos, and using animations to simplify complex concepts, making the content more accessible and interactive.

Outlines
00:00
🦷 Introduction to Leeway Space of Nance

This paragraph introduces the concept of Leeway space of Nance, a dental term related to the transitional period when deciduous teeth are replaced by permanent ones. It explains that during this second transitional period, the deciduous canine and molar are replaced by the permanent canine and premolars, resulting in extra space in the mouth. This extra space, known as Leeway space, is greater in the mandibular arch compared to the maxillary arch, with measurements provided for both arches. The significance of this space is also discussed, highlighting its role in the mesial drift of the mandibular molar to establish a class 1 molar relationship.

Mindmap
Keywords
💡Leeway space of Nance
The term 'Leeway space of Nance' refers to the extra space present in a person's dental arch during the second transitional period when the deciduous teeth are replaced by permanent ones. It is named after Dr. Norman E. Nance, who described this phenomenon. In the video, it is explained that this space is greater in the mandibular arch compared to the maxillary arch and is utilized by the mandibular molar to drift mesially, which helps in establishing a class 1 molar relationship. The concept is central to understanding the natural process of dental transition and occlusion.
💡Second transitional period
The 'second transitional period' is a specific phase in the development of a person's dentition when the deciduous, or 'baby', teeth are being replaced by the permanent teeth. This period is significant as it involves the exfoliation of the deciduous canine and molar teeth, making way for their permanent successors. The video explains that during this time, there is a sequence to the eruption of the permanent teeth and the exfoliation of the deciduous ones, which is essential for proper dental alignment.
💡Deciduous teeth
Deciduous teeth, commonly known as 'baby teeth,' are the first set of teeth that appear in humans. They are temporary and are eventually replaced by permanent teeth. In the context of the video, the focus is on the deciduous canine and molar teeth, which are shed during the second transitional period to make room for the permanent canine, premolars, and eventually the molars.
💡Permanent teeth
Permanent teeth are the set of teeth that follow the deciduous teeth in humans. They are meant to last a lifetime and are crucial for proper chewing, speech, and overall oral health. The video discusses the eruption of permanent teeth, particularly the canines and premolars, during the second transitional period and how they occupy less space than the deciduous teeth they replace, leading to the creation of leeway space.
💡Exfoliation
Exfoliation is the process by which teeth are naturally shed from the gum line. In the video, this term is used to describe the shedding of deciduous teeth to make way for the permanent teeth. The sequence of exfoliation is important as it affects the eruption pattern of the permanent teeth and the eventual alignment of the dental arches.
💡Eruption sequence
The 'eruption sequence' refers to the order in which the permanent teeth come in after the deciduous teeth have exfoliated. The video emphasizes the importance of this sequence in the proper development of the dental arches and the alignment of the teeth. It is a critical aspect of the second transitional period and contributes to the establishment of the leeway space.
💡Mesial drift
Mesial drift is the movement of teeth towards the center line of the jaw, or the midsagittal plane, of the mouth. In the video, it is mentioned that the mandibular molar utilizes the leeway space to drift mesially, which is essential for establishing a class 1 molar relationship, indicating proper alignment and occlusion of the teeth.
💡Class 1 molar relationship
A 'class 1 molar relationship' is a term used in dentistry to describe a proper alignment where the chewing surfaces of the upper and lower molars fit together in a way that allows for efficient chewing and grinding of food. The video explains that the mesial drift of the mandibular molar, facilitated by the leeway space, helps in achieving this ideal relationship.
💡Maxillary arch
The 'maxillary arch' is the dental arch located in the upper jaw. It plays a crucial role in the overall structure and function of the mouth, including speech and chewing. In the video, it is noted that the maxillary arch has less leeway space (1.8 mm) compared to the mandibular arch, which affects the amount of space available for the permanent teeth and their alignment.
💡Mandibular arch
The 'mandibular arch' is the dental arch in the lower jaw, which, like the maxillary arch, is essential for proper oral function. The video highlights that the mandibular arch has a greater leeway space (3.4 mm) than the maxillary arch, which allows for more room for the permanent teeth and contributes to the mesial drift of the mandibular molar.
💡Dental arches
Dental arches are the curved structures in the upper (maxillary) and lower (mandibular) jaws that hold the teeth. They are crucial for the alignment and function of the teeth. The video discusses how the leeway space varies between the maxillary and mandibular arches and how this affects the eruption and alignment of the permanent teeth during the second transitional period.
Highlights

Study of Leeway space of Nance is discussed in the video.

Deciduous teeth are replaced by permanent teeth during the second transitional period.

The deciduous canine and molar are replaced by the permanent canine, premolars, and this process is called the second transitional period.

The space occupied by deciduous teeth is greater than that required by the permanent successors.

Extra room created by the eruption of permanent teeth is referred to as leeway space.

Leeway space is significant in dental development as it allows for the proper alignment of teeth.

Mandibular molars utilize the leeway space to drift mesially, which helps establish a class 1 molar relationship.

The leeway space is greater in the mandibular arch compared to the maxillary arch.

In the maxillary arch, there is 1.8 mm of leeway space, with 0.9 mm on each side.

The lower arch has 3.4 mm of leeway space, with 1.7 mm on each side.

The video provides an animation to illustrate the sequence of exfoliation and eruption of teeth.

A link to a detailed video on the eruption sequence is provided in the description box and video cards.

The permanent teeth replace the deciduous ones, leaving a remaining space in the arch.

The concept of leeway space is crucial for understanding dental development and orthodontic treatment planning.

The video is a helpful resource for learning about dental transitions and the importance of leeway space.

The speaker encourages viewers to comment, subscribe, and share the video for further support.

The video concludes with a message of gratitude and a reminder to stay in touch for more informative content.

Transcripts

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Dental HealthTooth EruptionLeeway SpacePermanent TeethDeciduous TeethMandibular ArchMaxillary ArchClass 1 RelationshipDentistryEducational Content