Vol.15, No 2, 2008 pp. 68 - 73
UC 616.314-053.2
THE EFFECTS OF EARLY LOSS OF PRIMARY LATERAL
TEETH
Tatjana Tanić1,2, Zorica Blažej1,
Julija Radojičić2
¹Clinic of Stomatology, Niš, Serbia
2Faculty of Medicine, Dept. of Dentofacial
Orthopedics and Orthodontics, Niš, Serbia
E-mail: lanaija@junis.ni.ac.rs
Summary. The aim of the study was to establish the frequency of
orthodontic irregularities in the examined group of children, to determine
various factors that may increase or minimize reduction of mesiodistal
diameter of supporting zone and to determine the reduction degree of mesiodistal
diameter of supporting zone in children with approximal caries of deciduous
molars (and canines) in relation to intact supporting zone in children
with different types of malocclusion. Investigation of space loss in the
supporting zone included the analysis of study models and orthopantomographic
X rays taken from 100 patients. Out of this number, there were 46 subjects
with intact supporting zone (28 girls and 18 boys) and 54 subjects with
damaged supporting zone (44 girls and 10 boys). Measurements were performed
in all four quadrants using nonius with precision of 0.1mm. Statistical
analysis of the obtained data included mean value, standard deviation,
value range and statistical significance was determined by t-test. Results
indicate space reduction of supporting zone in case of early extraction
of any deciduous molar or canine, except in cases of overdeveloped jaws
or occlusal relationship in full class that impedes mesiodistal movement
of teeth due to presence of tuberculofissure bite. Postextraction space
in supporting zone is closed either by mesial or distal side (or both directions
simultaneously) depending on localization of 'empty' space in tooth arch.
Significant space loss in supporting zone was found in the girls upper
jaw bilaterally (t=3.41; p<0.01 and t=3.00; p<0.01) and in lower
jaw bilaterally (t=5.14; p<0.001 and t=3.75; p<0.001) and in boys'
left upper jaw (t=4.24; p<0.01). It may be concluded that maintenance
of supporting zone is very important both for regular placement of successors
and maintenance of morpho-functional occlusal complex.
Key words: Early loss of primary
lateral teeth, mesio-distal diametar supporting zone
POSLEDICE PREVREMENOG GUBITKA MLEČNIH
BOČNIH ZUBA
Kratak sadržaj: Istraživanje gubitka prostora u potpornoj zoni
(zona koja obuhvata mlečni očnjak i mlečne molare), obuhvatilo je analizu
studijskih modela i ortopantomografskih snimaka 100 pacijenata, od toga
46 ispitanika sa očuvanom potpornom zonom (28 devojčica i 18 dečaka)
i 54 ispitanika sa ošteċenom potpornom zonom (44 devojčica i 10 dečaka).
Cilj istraživanja je bio utvrđivanje frekvencije ortodontskih nepravilnosti
na ispitivanom uzorku dece, utvrđivanje mehanizma zatvaranja prostora
u potpornoj zoni, posle narušavanja njenog meziodistalnog promera;
determinisanje različitih faktora koji mogu favorizovati ili usporiti
redukciju meziodistalnog promera potporne zone i utvrđivanje veličine
smanjenja meziodistalnog promera potporne zone kod dece sa aproksimalnim
karijesom mlečnih molara (i očnjaka) u odnosu na očuvanu potpornu zonu
kod dece sa različitim vrstama malokluzija. Rezultati ukazuju na pojavu
redukcije prostora potporne zone, gotovo uvek kada postoji prevremena ekstrakcija
nekog od mlečnih molara ili očnjaka, osim u slučajevima kada postoje
prerazvijene vilice ili okluzalni odnos u punoj klasi, koji zbog prisustva
tuberkulofisurnog zagrižaja otežava meziodistalnu migraciju zuba. Postekstrakcioni
prostor u potpornoj zoni zatvara se iz oba pravca - mezijalnog ili
distalnog (ili iz oba pravca istovremeno) u zavisnosti od lokalizacije
"praznog" prostora u nizu. Signifikantan gubitak prostora u potpornoj zoni
ustanovljen je kod devojčica u gornjoj vilici obostrano (t=3,41; p<0,01
i t=3,00; p<0,01) i u donjoj vilici obostrano (t=5,14; p<0,001 i
t=3,75; p<0,001) i kod dečaka u gornjoj vilici levo (t=4,24; p<0,01).
Ključne reči: Prevremeni
gubitak mlečnih bočnih zuba, mezio-distalni dijametar potporne zone
