How to Treat Deep Overbites
- Submitted by: esfahani
- Views: 462
- Category: Science
- Date Submitted: 01/18/2011 03:23 AM
- Pages: 6
- Report this Essay
DEEP OVERBITES: AETIOLOGY AND MANAGEMENT
Definition
The incisor overbite (OB) is the vertical relationship of anterior teeth, and it describes the degree of overlap of these teeth.
Normal overbite = upper incisors cover between 1/3 to ½ of labial aspect of the lower incisors when viewed horizontally from the front.
Deep overbite = Overlap of more than ½ of the lower incisor crowns
Deep OB can be present in any of the main categories of malocclusion; but is one of the main features of Class II Division 2 malocclusion.
Incisors erupt towards their full potential and they tend to do so until they meet some form of hard or soft tissue resistance.
AETIOLOGY
Deep overbites result from a combination of genetic, environmental and local factors. Although they may be considered separately, many of them are interdependent.
SKELETAL FACTORS
Vertical Relationship
• Decreased lower facial height
• Low maxillary-mandibular planes angle
• Shape of the mandible
• Forward growth rotation of the mandible (orientates lower incisors more lingually)
• Downward rotation of the mandible
Antero-posterior Relationship
• Marked AP discrepancy = excessive overjet (could also be reverse OJ)
• This may mean no contact between anterior teeth which continue to erupt
Transverse
• Where lower arch is very narrow (esp II Div 2s) a scissors bite situation may develop, thus producing a deepening of the bite anteriorly.
SOFT TISSUE FACTORS
• Any abnormal behaviour or posture of the lips which prevenys teeth from occluding in their normal relationship may allow teeth to erupt beyond their normal level.
• Especially a high lower lip line, covering more than just the incisal 2-3 mm of the upper incisors.
• High circum-oral muscle activity and taut tissues
• These factors tend to retrocline incisors
• In II Div 1s, lower lip trap may procline the uppers, but tends to retrocline the lowers, and may contribute to a deep OB
DENTOALVEOLAR FACTORS...
Definition
The incisor overbite (OB) is the vertical relationship of anterior teeth, and it describes the degree of overlap of these teeth.
Normal overbite = upper incisors cover between 1/3 to ½ of labial aspect of the lower incisors when viewed horizontally from the front.
Deep overbite = Overlap of more than ½ of the lower incisor crowns
Deep OB can be present in any of the main categories of malocclusion; but is one of the main features of Class II Division 2 malocclusion.
Incisors erupt towards their full potential and they tend to do so until they meet some form of hard or soft tissue resistance.
AETIOLOGY
Deep overbites result from a combination of genetic, environmental and local factors. Although they may be considered separately, many of them are interdependent.
SKELETAL FACTORS
Vertical Relationship
• Decreased lower facial height
• Low maxillary-mandibular planes angle
• Shape of the mandible
• Forward growth rotation of the mandible (orientates lower incisors more lingually)
• Downward rotation of the mandible
Antero-posterior Relationship
• Marked AP discrepancy = excessive overjet (could also be reverse OJ)
• This may mean no contact between anterior teeth which continue to erupt
Transverse
• Where lower arch is very narrow (esp II Div 2s) a scissors bite situation may develop, thus producing a deepening of the bite anteriorly.
SOFT TISSUE FACTORS
• Any abnormal behaviour or posture of the lips which prevenys teeth from occluding in their normal relationship may allow teeth to erupt beyond their normal level.
• Especially a high lower lip line, covering more than just the incisal 2-3 mm of the upper incisors.
• High circum-oral muscle activity and taut tissues
• These factors tend to retrocline incisors
• In II Div 1s, lower lip trap may procline the uppers, but tends to retrocline the lowers, and may contribute to a deep OB
DENTOALVEOLAR FACTORS...