8. The number and surfaces of the teeth кількість та поверхні зубів

PART I

PRE-TEXT ASSIGNMENTS

Exercise 1. Remember the pronunciation of the words:

absorbing	[әb so:biŋ]	incisor	[in saizә]
canine	[ kænain]	molar	[moulә]
deciduous	[di'sidjuәs]	permanent	[pә:mәnәnt]
Exercise 2.	Translate and learn the	following words:
adjacent	[ә'eisәnt]	to loose	[lu:s]
arrival	[ә' raivl]	lower	[1оuә]
average	[ævәri]	predecessor	[pri:disesә]
backwards	[bækwәdz]	set	[set]
commence	[kә' mens]	to shed	[∫ed]
common	[' kо mәn]	to subject	[' sΛbikt]
complete	[kәm'pli:t]	successor	[sΛk'sesә]
correspon	[koris'pondiŋ]	temporary	[' tempәrәri]
to deprive	[di'praiv]	upper	[Λpә]
to erupt	[i'rΛpt]

Remember:

-ure — суфікс іменника.

Якщо перед цим суфіксом при­голосний t, то -ture читається [t∫ә] structure — структура, будова.

Якщо перед ним приголосний s, то -sure читається [ә]: measure ['mезә] — міра, мірка, критерій.

Якщо ж -ss, то -ssure читається [∫ә]: pressure ['рге∫ә] — тиск.

Exercise 3. Read and translate:

future, nature, mixture, structure, pleasure, measure.

Remember:

За допомогою суфікса -ion утворюються іменники від коренів дієслів:

-tion, -ssion читається [∫n], a -sion після голосної читається [зn].

Склад перед суфіксом -ion наголошений:

to erupt [іrΛpt] — прорізуватися (про зуби);

eruption [irΛp∫n] — прорізування (зубів);

vary [veәri] — міняти(ся), змінювати(ся);

variation [veәri'ei∫n] — зміна.

Exercise 4. Read and translate:

Resorbtion, occlusion, attention, invasion, session, represen­tation.

Exercise 5. Define what part of speech the following words belong to, translate them, remember the words:

Call, complete, even, for, air.

Exercise 6. Read and translate the words and word combinations:

tooth — teeth [tu:θ— ti:θ]: the deciduous teeth, milk or tem­porary teeth, permanent teeth, tooth structure, surfaces of the teeth.

incisor [in'saizә]: central incisor, lateral incisor, decid­uous incisor, permanent incisor, incisal edge.

erupt [i'rΛpt]: erupts, erupted, eruption, to erupt before and after birth, eruption commences, eruption is completed, unerupted.

average [ævәri]: average age, on an average, average American.

Exercise 7. Read the text and translate it. Compose the plan and retell the text:

The number of the teeth The Deciduous Teeth

The deciduous teeth are the first set and are also known as milk or temporary teeth. There are twenty of them; ten in each jaw with five on each side.

Deciduous teeth start developing inside the jaw before birth and erupt after birth. Eruption starts at six months and is completed at two years. Individual variation is common but the average ages are as follows:

A. Central incisor, 6months;

B. Lateral incisor, 8 months;

C. Canine, 18 months;

D. 1st MOLAR, 12 months;

E. 2nd MOLAR, 24 months.

Lower teeth usually erupt before their corresponding upper.