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Welcome to Guident our online dental magazine. Guident is a globally well-known online international dental journal/publication that is circulated in India as well as globally. The journal is designed to help dentists to build long-term dentistry career success by providing them knowledge to optimize their practice performance during changing times. The field of dentistry has gone through a phase of transformation from in the last century with many new advances and technologies coming up. The complete dental profession is on the verge of many new innovations. To keep all the people associated with this profession we provide our dental magazine ‘Guident’. Our magazine upgrades the knowledge of professionals with information about the latest achievements and advances in the field. Our journal is an online international dental journal which is internationally indexed. The Journal is globally acclaimed in terms of dentistry Knowledge and information; its has been reviewed by many professional dentists of all over the world.

Thousands of professionals associated with the dental profession visit our website daily to read dental articles on all topics of Dentistry. We have already completed seventy monthly issues and are striving for more. Some of very famous hosts indexed our online international dental publication. These hosts are the notable ones like- ProQuest, EBSCO host and Ulrichsweb Global Series Directory. We have shaped up our dental magazine to help dentists to achieve great successes in their professional career during this changing time, for which they need to possess latest knowledge and that is what we provide. Apart from everything, an online dental magazine adds a lot to the convenience of Dental professionals. Because they have a busy schedule, so this online international publication they can access anywhere and read it. In Guident Journal, we publish all latest technique articles in dentistry.

Authors : Dr. Arun Garg, Dr. Krishna Nayak

Introduction
Cleft lip and palate is one of the most common congenital anomalies of the face and an orthodontist plays an integral role in the multidisciplinary team approach required for the management of these patients. With a cleft lip and palate patient, the tendency is to concentrate on the growth of the maxilla and to forget that the mandibular growth and its direction are equally important and may enhance or hurt efforts to achieve good facial profile relationships as well as desirable occlusal relationships. The position, growth and configuration of the lower jaw are equally important to the aesthetic appearance of the face.
The objective of the present study is to evaluate the variation of mandibular morphology and spatial position in cleft lip and palate patients when compared to a control group through lateral cephalometric radiographs.

Subjects and Methods:
Materials for the study were the lateral cephalomatric radiographs of 38 patients who reported to department of orthodontics and dentofacial orthopaedics. All patients displayed cleft lip and palate, all in permanent dentition and without a history of pre-orthodontic treatment. Non growing individuals were selected to standardise the influence of growth.

Cleft Group:

(Mean age): 19 years and 04 months-- Males
19 years and 03 months-- Females

Control Group:

consisted of 45 adult (20 females and 25 males) without any gross malocclusion and all were in the permanent dentition

(Mean age): 17 years and 07 months -- Males

17 years and 02 months-- Females

Lateral cephalograms were taken and various cephalometric parameters (both linear and angular) were used to evaluate them.
Cephalometric landmarks (Figure 1)

  1. Sella (S)
  2. Nasion (N)
  3. Gnathion (Gn)
  4. Gonion (Go)
  5. Menton (Me)
  6. Anterior nasal spine (ANS)
  7. Pogonion (P)
  8. Supramentale (B)
  9. Condilion (Co)

Following measurements were made (Figure 2)

  1. Anterior Cranial Base (SN)
  2. Structure of Mandible.
  1. Go-Gn – Length of the body of the mandible
  2. Co-Go – Length/height of the ramus of the mandible
  3. Co-Gn – Total length of the mandible
  4. P-NB – denotes the antero-posterior position of the chin in relation to the NB line
  5. Co-Go-Me – denotes the gonial angle which determines the angular relationship between the body and the ramus.


3) Spatial position of Mandible in relation to Anterior Cranial Fossa

  1. S-Go – Posterior facial height
  2. N-Me -- Anterior facial height
  3. SNB -- Anterio-Posterior relation of mandible to cranial base
  4. Sn-Go-Gn -- Angular relation of mandibular plane to anterior cranial base
  5. ANS-Me -- Lower anterior facial height
  6. F) SN-Gn -- Y-axis

Two way analysis of variance was used to observe the difference between group means. Comparisons between the cleft group and control group were undertaken with large sample test.


Results:Table 1

Cephalometric Parameter Non Cleft (N = 45) Cleft Lip And Palate(N = 38) Differences In Mean
Mean S.D Mean S.D    
S-N 76.0 4.01 72.1 4.2 3.9
Go – Gn 81.9 5.11 75.3 6.03 6.6
Co – Go 63.6 4.69 55.7 6.1 7.9
Co – Gn 128.1 6.70 120.6 8.0 7.4
P-NB 2.2 1.1 3.3 2.1 - 1.1
Co-Go-Me 124.1 4.9 132.0 7.0 - 7.9
S-Go 83.75 5.8 76.71 7.6 7.04
N-Me 125.6 6.75 126.47 10.9 0.87
ANS-Me 71.4 5.2 74.4 8.9 - 3.0
SNB 79.8 3.1 77.4 4.5 2.4
SN-Go-Gn 28.9 4.06 35.9 8.2 - 7.0
SN-Gn 66.04 3.02 69.03 5.3 - 2.99


Table2

Cephalometric Parameters Significans
Valu Inference
S-N 1.98 Significant
Go – Gn 1.98 Significant
Co – Go 1.98 Significant
Co – Gn 1.98 Significant
P-NB 1.98 Significant
Co-Go-Me 1.98 Significant
S-Go 1.98 Significant
N-Me 1.98 Not Significant
ANS-Me 1.98 Not Significant
SNB 1.98 Not Significant
SN-Go-Gn 1.98 Significant
SN-Gn 1.98 Not Significant


Discussion:
Analysis of the results shows significant difference in structure and spatial relation of the mandible in cleft lip and palate individuals when compared to the non-cleft individuals. This is in agreement with Jain1, Horowitz2and Bishara3.

In the cleft group the mandibular dimension at the level of the ramus (S-Go, Co-Go), the body (Go-Gn) and the total length (Co-Gn) was found to be smaller. The mandible showed besides the short ramus and body length, a more vertical growth pattern. These findings can be confirmed by decreased posterior facial height (S-Go), greater anterior facial height (N-Me), more obtuse gonial angle (Co-Go-Me) and a downward and backward rotation of the mandible relative to the cranial base (Sn-Go-Gn).This is in agreement with the previous studies done by Hayashi4, Smahel5, Clarke6, Roth7and Rantha8 and many other similar studies.

Concerning the antero-posterior spatial relationship of mandible to the cranial base (SNB), cleft group showed a significant posterior repositioning of the mandible when compared to subjects without clefts. This is due to greater downward and backward rotation of the mandible, leading to a more posterior position of landmark B. During the mixed dentition period when the maxillary segments are displaced medially, tongue cannot be accommodated in its normal position in the palate. The position acquired by the tongue becomes decisive for the pattern of further development of the maxilla as well as the mandible. Here if the nasal respiration is impeded the tongue may assume a low position to facilitate normal respiration. If the tongue in the low position does not rest under the occlusal surface of the maxillary teeth, the alveolar height will increase, resulting in a progressive lowering of the mandible, a more open gonial angle and a more retruded position of the chin. The shorter mandibular length is being attempted to be compensated by a short cranial base length. Besides the shorter ramus and body lengths, a more vertical growth pattern is seen in cleft group.

Not only is the extent or amount of lower jaw growth but also the direction of mandibular growth is important and deserves equal consideration while deciding what orthodontics can do to improve the function as well as the facial appearance of the cleft lip and palate individual .Clinically, such knowledge can be helpful in estimating the eventual mandibular position following growth and providing improved insight into treatment modalities that might be best suited for any individual patient. In formulating a treatment plan of any growing patient, it is mandatory for the operator to know about the growth and development of the craniofacial skeleton and thus predict with various methods as to what the final outcome will be without any treatment. For growth predictions in cleft lip and palate cases, one needs to know the altered pattern of growth which has taken place in all dimensions.

A cleft lip and palate patient usually show a retrognathic or concave profile and is managed with a reverse pull headgear with simultaneous palatal expansion appliances. In such cases, it is to be determined, whether the mandible should be held back during the above treatment and if so, how long to achieve an acceptable maxillo - mandibular relationship and hence an acceptable profile. Usually, in non growing patients who need an orthodontic - orthognathic approach to correct the concave profile, the morphology and spatial position of maxilla and mandible should be known to determine, how much to decompensate, which arch to do surgery, in which direction and the amount of push back or advancement to be made.

Conclusion:
It is believed that there are many roads leading to Rome, hence it is to be accepted that many different treatment strategies and techniques may produce good results. Choosing from more than one approach may open the door to a better understanding of the various treatment strategies and their applications. This option should encourage us to explore more unorthodox ideas and approaches.
Care for the individual with a cleft continues throughout the life time of that individual. Levels of clinical success have improved a lot over the years and achieving ideal results is becoming a more frequent possibility. Orthodontics in all ages plays a valuable role in striving to achieve ideal results in the rehabilitation of the cleft lip and palate individual.

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