16. Analysis Of Diagnostic Records - Cast Analysis Flashcards

Question

# 16. Analysis Of Diagnostic Records - Cast Analysis Gerlach method

Answer 1

* **Determining interpremolar width** * When **upper lateral incisors unusually shaped** * Sum **mesiodistal width of lower incisors x 1.35=>**interpremolar width (SI)

Answer 2

* **Expansion or constriction** of dental arch * Measurements exceeding normal values=>expansion * Smaller measurements=>constriction * Differences of 1mm=>not interpreted

Answer 3

* According to **transverse plane** * Anterior segment=>length of anterior arches of both maxillary (Lo) and mandibular (Lu) measured using orthometer * Perpendicular line drawn from midpoint of tangent line to buccal surfaces of central incisors to line connecting first premolars=> * Measured at PP points * **Increased values=>lengthening of dental arch** * **Decreased values=>shortened dental arch** * Posterior segment=>positions of left and right posterior teeth compared * Perpendicular line drawn from identical points on each tooth to midsagittal line * **Discrepancy indicates mesialisation of teeth present**

Answer 4

* According to **horizontal (occlusal) plane** * *Evaluation is conducted on fully erupted maxillary and mandibular permanent teeth* * Consider normal curve of Spee * Measurements on flat surface * **Infraposition**=>teeth positioned under occlusal plane * **Supraposition**=>teeth positioned above occlusal plane

Answer 5

* Evaluated in **transverse plane** * **Anterior segment**=>horizontal distance between labioincisal surfaces of mandibular incisors and palatinal surface of maxillary incisors measured * Results may show => * **Increased overjet, edge-to-edge bite** * **Anterior cross-bite, or anterior cross-bite w/ reverse overjet** * **Posterior segment**=>vertical lines of occlusion drawn through specific points on permanent teeth * Anteroposterior relationships evaluated using Angle classification=>Class I, Class II, and Class III

Answer 6

lines of molars and canines are aligned

Answer 7

* **Mesiobuccal groove of mandibular first molar distal to mesiobuccal cusp of maxillary first molar** * **Distal surface of mandibular canine is distal to mesial surface of maxillary canine** * Subdivisions: **Class II 1 => distal occlusion w/ proclined maxillary anterior teeth and large overjet** * Class II 2 =>**distal occlusion w/retroclined maxillary central incisors and proclined maxillary lateral incisors and a deep overbite** (deckbiss)

Answer 8

* Mesiobuccal groove of mandibular first molar mesial to mesiobuccal cusp of maxillary first molar * Distal surface of mandibular canine is mesial to mesial surface of maxillary canine

Answer 9

* Assessed according to the **sagittal plane** * Anterior segment=>*measuring midline shifts to the left or right relative to maxillary midline* * Shift may be caused by=> **Laterodeviation, laterognathia, or anterior tooth shift** * Posterior segment=> * *Posterior cross-bite* * *Cusp-to-cusp bite* * *Lingual cross-bite* * *Buccal cross-bite*

Answer 10

* Evaluated according to the **horizontal plane** * Anterior segment=> * **Moderate overbite**=>incisal edges of maxillary teeth in middle third or half of clinical crown of mandibular incisors * **Deep overbite**=>Incisal edges of maxillary teeth reach within cervical third of mandibular incisors * **Severe overbite**=>incisal edges of maxillary teeth make contact w/ gingiva * **Anterior open bite**=>no incisal contact between lower and upper incisors * **Edge-to-edge bite**=>incisal edges of upper and lower incisors in direct contact

Answer 11

* Involve lack of occlusal contact between maxillary and mandibular posterior teeth * Vertical distances between cusps of posterior teeth measured

Answer 12

* **Similar methodology as in permanent dentition** * *Differences due to absence of premolars*=> * *Inability to assess arch width and length accurately*

Answer 13

* Moyers * Droschl * Tanaka-Johnston

Answer 14

* Available space for eruption of **canines and premolars** * Mesiodistal width (MDW) of lower incisors summed to obtain **"si,"**=> * Checked against **ideal space** needed using a table=> * Each quadrant measured individually * Calculations made based on difference between **measured and mean** values to determine space availability

Answer 15

* **Similar to Moyers** * Prediction values based on **gender** * **Sum of MDW of mandibular permanent incisors** * Applies Moyers' table

Answer 16

* **Sum of mandibular permanent incisors determined** * For maxillary canines and premolars=> * **11mm** added to one half of the sum of "si." * For mandibular canines and premolars=> * **10.5mm** added to one half of the sum of "si." ## Footnote -Uses individual parameters of dental arch without relying on probability values -check how to calculate this properly

Answer 17

* Anterior segment=>**same permanent dentition** * Posterior segment=>lower canine line drawn either through distal surface of canine if "primate space" between canine and first primary molar * Or through contact point if no space exists * A "flush terminal plane" noted when distal surfaces of mandibular and maxillary second primary molars in the same vertical plane

Answer 18

* Uses a line drawn from **interpremolar line** to a point in between the **2 maxillary incisors**. * Analysis of front length of the upper and lower arches – Lo and Lu(from the midpoint of the PP line to a point in between the two maxillary incisors) * If the distance is greater - there is **proclination** of upper/lower anteriors * If the distance is less - there is **retroclination** of upper/lower anteriors. * Mandibular value = maxillary value – 2mm

Answer 19

The upper lateral incisors and third molars ## Footnote These specific teeth often show a reduction in size compared to other teeth.

Answer 20

May exhibit normal or abnormal morphology=> peg-shaped ## Footnote Peg-shaped teeth are a common abnormality associated with microdontia.

Answer 21

**Proportional correlation** between mesiodistal (MD) and buccolingual (BL) widths of **mandibular incisors** ## Footnote The index is specifically focused on the dimensions of mandibular central and lateral incisors.

Answer 22

(MD mandibular central)/(BL mandibular central) x 100 = 88.4 (+- 4.3) ## Footnote This formula provides a percentage that reflects the relationship between MD and BL widths.

Answer 23

(MD mandibular lateral)/(BL mandibular lateral) x 100 = 90.4 (+- 4.8) ## Footnote This index indicates the proportional relationship for the mandibular lateral incisor.

Answer 24

**Harmony** between upper and lower anterior arches based on sum of **permanent incisor widths**

Answer 25

A value of si/SI=0.74 (ranging from 0.72 to 0.77)

Answer 26

Wider maxillary anterior area (tendency to deep overbite)

Answer 27

Wider mandibular anterior area (tendency to edge-to-edge)

Answer 28

SI/si ## Footnote SI/si is calculated instead of si/SI

Answer 29

1.35 (ranges from 1.22 to 1.42) ## Footnote This value indicates the relationship between SI and si

Answer 30

Edge-to-edge ## Footnote This refers to the alignment of teeth

Answer 31

Deep overbite ## Footnote This refers to the extent to which upper teeth overlap lower teeth

Answer 32

Determines discrepancy in mesiodistal width (MDW) of maxillary and mandibular teeth ## Footnote Bolton's ratio helps in assessing tooth size discrepancies that may affect dental alignment and occlusion.

Answer 33

Divide sum of MDW of mandibular 12 teeth by the sum of MDW of maxillary 12 teeth and multiply by 100=91.3% ## Footnote This calculation provides a percentage that indicates the relationship between the sizes of the maxillary and mandibular teeth.

Answer 34

Excess maxillary anterior tooth material ## Footnote A decreased value suggests that the upper front teeth are larger relative to the lower front teeth.

Answer 35

Excess mandibular anterior tooth material ## Footnote An increased value suggests that the lower front teeth are larger relative to the upper front teeth.

Answer 36

* Used for Transverse discrepancies * Measures Anterior and posterior arch widths

Answer 37

Deepest point of central sulcus of first permanent premolar

Answer 38

Contact point between first and second premolars buccally

Answer 39

midpoint of the mesiobuccal fissure of the first permanent molar

Answer 40

Tip of distobuccal cusp of first permanent molar

Answer 41

Compression

16. Analysis Of Diagnostic Records - Cast Analysis Flashcards

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