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The relationship between the mid-point and most-prominent point on the labial curve of upper anterior teeth.

Smith RN, Brook AH, Karmo M - Open Dent J (2009)

Bottom Line: Approximately 80% of upper central incisors had coincident mid- and most-prominent points.Upper lateral incisors and canine teeth had approximately 50% coincidence.The high proportions of non-coincident examples found suggest that clinicians should be aware of individual variation and that this may possibly effect 3(rd) order alignment.

View Article: PubMed Central - PubMed

Affiliation: Dental Sciences, University of Liverpool, UK. r.n.smith@liverpool.ac.uk

ABSTRACT

Objectives: This study investigates coincidence of the most-prominent point and the mid-point on upper anterior teeth in relation to the use of straight-wire appliances.

Materials and methods: Alginate impressions of the upper jaw were obtained from forty Caucasian patients. Impressions were cast using hard dental stone. The teeth on each upper study model (canine to canine) were marked along the facial axis of the clinical crown (FACC line) then separated using a very thin diamond disc. Each tooth was mounted on a glass slide using sticky wax and cut into two halves down this FACC line. Images were acquired of the sections and a straight line connecting the gingival margin and the incisal edge was drawn on the flat cut surfaces (now the proximal crosssectional view). From this line, perpendicular lines were drawn at the mid-point and most prominent point to the labial curve. Coincidence rate was calculated or whether the most prominent point was gingival or incisal to the mid-point.

Results: Approximately 80% of upper central incisors had coincident mid- and most-prominent points. Upper lateral incisors and canine teeth had approximately 50% coincidence. The vast majority of cases without coincidence showed the most-prominent point incisal to the mid-point for all tooth kinds with just 5% or less gingival.

Conclusions: The high proportions of non-coincident examples found suggest that clinicians should be aware of individual variation and that this may possibly effect 3(rd) order alignment.

No MeSH data available.


Related in: MedlinePlus

Examples of the most-prominent point presenting coincident, incisal and gingival to the mid-point of the labial curve.
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Figure 2: Examples of the most-prominent point presenting coincident, incisal and gingival to the mid-point of the labial curve.

Mentions: For L2, L3 and L4 forty cases were assessed for the experimental data including the mean value, standard deviation and range (minimum and maximum values). A negative L4 value signifies the most-prominent point is incisal to the mid-point, whereas a positive L4 values infers the most-prominent point is gingival to the mid-point (Fig. 2). The authors would also like to recognise the importance of further study assessing the shape of posterior teeth. These could not be considered here due to time constraints of the main author.


The relationship between the mid-point and most-prominent point on the labial curve of upper anterior teeth.

Smith RN, Brook AH, Karmo M - Open Dent J (2009)

Examples of the most-prominent point presenting coincident, incisal and gingival to the mid-point of the labial curve.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2724645&req=5

Figure 2: Examples of the most-prominent point presenting coincident, incisal and gingival to the mid-point of the labial curve.
Mentions: For L2, L3 and L4 forty cases were assessed for the experimental data including the mean value, standard deviation and range (minimum and maximum values). A negative L4 value signifies the most-prominent point is incisal to the mid-point, whereas a positive L4 values infers the most-prominent point is gingival to the mid-point (Fig. 2). The authors would also like to recognise the importance of further study assessing the shape of posterior teeth. These could not be considered here due to time constraints of the main author.

Bottom Line: Approximately 80% of upper central incisors had coincident mid- and most-prominent points.Upper lateral incisors and canine teeth had approximately 50% coincidence.The high proportions of non-coincident examples found suggest that clinicians should be aware of individual variation and that this may possibly effect 3(rd) order alignment.

View Article: PubMed Central - PubMed

Affiliation: Dental Sciences, University of Liverpool, UK. r.n.smith@liverpool.ac.uk

ABSTRACT

Objectives: This study investigates coincidence of the most-prominent point and the mid-point on upper anterior teeth in relation to the use of straight-wire appliances.

Materials and methods: Alginate impressions of the upper jaw were obtained from forty Caucasian patients. Impressions were cast using hard dental stone. The teeth on each upper study model (canine to canine) were marked along the facial axis of the clinical crown (FACC line) then separated using a very thin diamond disc. Each tooth was mounted on a glass slide using sticky wax and cut into two halves down this FACC line. Images were acquired of the sections and a straight line connecting the gingival margin and the incisal edge was drawn on the flat cut surfaces (now the proximal crosssectional view). From this line, perpendicular lines were drawn at the mid-point and most prominent point to the labial curve. Coincidence rate was calculated or whether the most prominent point was gingival or incisal to the mid-point.

Results: Approximately 80% of upper central incisors had coincident mid- and most-prominent points. Upper lateral incisors and canine teeth had approximately 50% coincidence. The vast majority of cases without coincidence showed the most-prominent point incisal to the mid-point for all tooth kinds with just 5% or less gingival.

Conclusions: The high proportions of non-coincident examples found suggest that clinicians should be aware of individual variation and that this may possibly effect 3(rd) order alignment.

No MeSH data available.


Related in: MedlinePlus