Abstract:
A method of treating gum disease provides for directing a stream comprising an oxidizing gas onto inflamed human gingiva for a period of time sufficient to kill microorganisms within said inflamed human tissue.

Description:
[0001]    This invention relates to the use of ozone in he treatment of dental and oral conditions.  
           [0002]    The great destructive disease of teeth is dental caries which may be defined as the acid dissolution of enamel, dentine or cementum as a consequence of the metabolism of micro-organisms living within deposits on the teeth known as plaque. Dental caries is believed to be associated with specific micro-organisms, the principal ones being Streptococcus Mutans, Lactobacilli, Actinomyces Visosus Serovar 2, Actinomyces Naesludii and “Intermediate” Actinomyces, other Streptococci and yeasts. These are acid producing micro-organisms which produce acids such as acetic and lactic acids from the dietary carbohydrates. The micro-organisms associated with dental caries are unique and are ecologically very different from those associated with, for example, infected root canals.  
           [0003]    Dental caries is currently managed by one or more of the following:  
           [0004]    (i) preventive treatment by, for example, dietary and oral hygiene measure and may include the topical application of chemotherapeutic agents;  
           [0005]    (ii) the removal of dentine exhibiting the signs of active caries;  
           [0006]    (iii) the protection of any newly exposed non-carious dentine with restorative material.  
           [0007]    Measures aimed at the prevention or the arrest of dental caries are mainly based on the elimination of dental plaque from the surfaces of roots and the institution of dietary controls to reduce the frequency and quantity of readily fermentable carbohydrate ingestion. The mechanical removal of plaque has been a major platform for the prevention of dental caries for some time. However, this poses special problems in the case of primary root caries due to access problems. Because dentine has a Knoop hardness of  68  in contrast to enamel at  11 , the mechanical removal of plaque from its surface inevitably results in some loss of tissue also. Toothbrush abrasion is now a very common phenomenon and invariably leads to the loss of root dentine from the facial aspects of teeth. Consequently, the traditional methods of plaque control in the prevention of dental caries create further problems even when access permits it to be used effectively.  
           [0008]    Conventional caries removal and cavity preparation entail the use of high and low speed handpieces. However, disadvantages of this system include the perception that drilling is unpleasant for patients and local anesthetic is frequently required. Furthermore, handpieces are expensive to purchase and maintain and their use may lead to the removal of softened but uninfected dentine resulting in the excessive loss of tooth tissue.  
           [0009]    Where restoration is required, all materials used to restore carious lesions have their limitations. For example, gold and ceramic are expensive and present a technical challenge for the practitioner. While amalgam is durable, predictable material, it has poor aesthetic qualities, is potentially toxic and may cause allergic reactions in some people.  
           [0010]    It is an object of the invention to alleviate the disadvantages of the prior art.  
           [0011]    It has now unexpectedly been found that ozone can penetrate carious tissue and can therefore be used in the treatment of dental caries.  
           [0012]    According to the present invention there is provided the use of ozone in the preparation of a therapeutic system for the treatment of dental caries.  
           [0013]    As used herein, the term “ozone” is intended to embrace pure ozone, oxonised air and ozonized aqueous media, such as water optionally containing a reductant, such as thiocyanate or peppermint.  
           [0014]    The ozone is delivered at a pressure sufficient to penetrate the carious tissue and at a concentration and for a period of time sufficient to kill substantially all of the micro-organisms within the carious lesion.  
           [0015]    Preferably, a needle-sized jet of pure ozone or ozonized air in a shroud of micro-organism-free aqueous medium, e.g. water optionally containing a reductant, is injected at the desired location.  
           [0016]    If desired, a sealant of the type known in the art may be applied to a carious lesion following ozone treatment.  
           [0017]    The advantages using ozone in the treatment of dental caries include the following:  
           [0018]    1. It eliminates drilling and its attendant problems;  
           [0019]    2. It is rapid and painless;  
           [0020]    3. It does not require sophisticated methods of isolating the tooth;  
           [0021]    4. No local anesthetic is required.  
           [0022]    The invention is illustrated in the following Examples. Unless otherwise stated, the ozone delivered in the following Examples is present in air at a concentration of 5.2%,  
         EXAMPLE 1  
         [0023]    Many studies concerning the clinical evaluation of ozone have been based on assessments of its harmful effects rather than demonstrating any therapeutic benefits it may offer. Ozone is one of nature&#39;s most powerful oxidants which accounts for its ability to kill bacteria, spores and viruses. Uniquely, ozone decomposes to a harmless, non-toxic and environmentally safe material (oxygen). In this investigation, a multicomponent evaluation of the oxidative consumption of salivary biomolecules by ozone (O 3 ) has been performed using high resolution proton ( 1 H) nuclear magnetic resonance (NMR) spectroscopy. The ozone-generating equipment employed in this study was designed by Purezone Ltd. (Ipswich, U.K.). Unstimulated human saliva samples were collected from 8 patients and each of them was divided into two equivalent portions (0.60 ml). The first of these was treated with O 3  generated from the above device for a period of 30 seconds; the second group of portions served as controls. Samples were subjected to  1 H NMR analysis at an operating frequency of 600 MHz. Results acquired revealed that O 3  treatment gave rise to (1) the oxidative decarboxylation of the salivary electron-donor pyruvate (generating acetate and CO 2 , as products), (2) oxidation of the volatile sulphur compound precursor methionine to its corresponding sulphoxide and (3) the oxidative consumption of salivary polyunsaturated fatty acids. Moreover, evidence for the O 3 -mediated oxidation of salivary 3-D-hydroxybutyrate was also obtained. High field  1 H NMR spectroscopy provides much useful analytical data regarding the fate of O 3  in human saliva, information which is of much relevance to its potential therapeutic actions in vivo.  
         EXAMPLE 2  
         [0024]    Ozone Effect on Microflora from Primary Root Caries ex-vivo  
           [0025]    Primary root carious lesions (PRCL) are a major clinical problem. The aim of this study was to establish if ozone could achieve effective microbial killing in PRCL. An ozone producing generator (Purezone Ltd., Ipswich, U.K.) was used in this ex-vivo study assessing the use of ozone on PRCL. In this study, soft PRCL requiring restoration were used as these are the most severe type of lesion found in humans. 20 freshly extracted teeth with PRCL requiring restoration were used. After plaque removal using a hand held standard fine nylon fiber sterile toothbrush with sterile water as a lubricant to cleanse the surface, each tooth was then isolated using sterile cotton wool rolls and dried using a dry sterile cotton wool roll. A sample of PRCL was taken using a sterile excavator from half of the most active part of the lesion. Subsequently, 10 seconds of the ozonized water was applied to the lesion and another sample was taken from the other half of the most active part of the lesion. Each sample was weighed and immediately placed in 1 ml of Fastidious Anaerobe Broth (FAB). To each 1 ml of FAB containing a biopsy o carious or ozone treated carious dentine, sterile glass beads were added. They were vortexed for 30 seconds to facilitate the extraction of any micro-organisms from the carious dentine and disperse any aggregates. After decimal dilution with FAB, 100 ml aliquots of these was spread on Fastidious Anaerobe Agar (LabM, Bury, Lancs., U.K.) supplemented with 5% (V/V) horse blood in an anaerobic chamber at 37° C. for four days. The mean±SE number of each colony type was counted and calculated.  
                                                                     Before Ozone   After 10 Seconds           Treatment   of Ozone Treatment                                        Total cfu (Log 10 )   5.9 ± 0.15   3.57 ± 0.37                      
 
           [0026]    Using the paired Student t-test a significant difference (p&lt;0.001) was observed between the two groups. Clearly, the percentage of micro-organisms killed associated with the use of ozone was more than 99%.  
         EXAMPLE 3  
         [0027]    Ozone Effect on Microflora from Primary Root Caries ex-vivo  
           [0028]    The procedure of Example 2 was repeated except that ozonized water was applied to the lesion for 20 seconds. Using the paired student t-test, a significant difference was observed in the ozonized water group (log 10  3.77±0.42, mean ±SE) compared with the control group (log 10  6.18±0.21) (p&lt;0.001).  
           [0029]    The results of these tests show that the use of ozone can provide an effective, rapid and simple means for killing micro-organisms in carious lesions.  
         EXAMPLE 4  
         [0030]    Sealant Shear Bond Strength to Sound and Carious Radicular Dentine  
           [0031]    These has been little research on the interaction between primary root carious lesions (PRCL) and adhesive materials. The aim of this study was to examine the shear bond strength of four adhesive systems to PRCL with sound dentine acting as a control. The adhesive systems used were:  
           [0032]    1. OptiBond FL Prime 1 /OptiBond FL Adhesive 1 /OptiGuard 1    
           [0033]    2. OptiBond FL Prime/OptiGuard  
           [0034]    3. OptiGuard and  
           [0035]    4. ChemFil II 2    
           [0036]    The materials were applied to sound radicular dentine and PRCL in vitro in freshly extracted teeth. The bonding site was macroscopically intact, was flat and had at least a 3.5 mm diameter. 37% phosphoric acid was used for 15 seconds in samples in groups 1-&gt;3 whilst 25% polyacrylic acid was used in group 4. After bonding the samples were stored for seven days in a moist atmosphere at 37° C. A shearing force was applied at 1 mm/minute. There were at least 10 samples in each group. The mean (s.e.) shear bond strengths were (MPa);  
                                                       Adhesive   Control   Carious                           OptiBond FL Prime/Optibond   5.31 (1.03)   5.58 (1.05)           FL Adhesive/OptiGuard           Optibond FL Prime/OptiGuard   2.01 (0.59)   1.63 (0.40)           OptiGuard   0.73 (0.24)   1.45 (0.52)           ChemFil II   1.42 (0.28)   1.01 (0.26)                      
 
           [0037]    While statistical testing showed that the shear bond strength of the OptiBond FL Prime/OptiBond FL Adhesive/OptiGuard was significantly the highest, (p&lt;0.001), the caries status of the root surface had no significant influence on the bond strength. OptiGuard in combination with OptiBond FL Prime and OptiBond Adhesive had the highest bond strength and this was not influenced by the caries status of the surface.  
           [0038]    [0038] 1 Kerr, Romulus, Mich., U.S.A.;  
           [0039]    [0039] 2 Dentsply, Konstanz, Germany.  
         EXAMPLE 5  
         [0040]    The effect of ozone on primary root caries and associated micro-organisms  
           [0041]    The aims of these studies were to evaluate the efficiency of ozone on primary root caries and associated micro-organisms ( Streptococcus sobrinus ; TH 21  Streptococcus mutans ; NCTC 10449). In study 1, 40 soft primary root carious lesions (PRCLs) from freshly extracted teeth were used and randomly divided into two groups to test the exposure to ozone for either 10 or 20 seconds. There was a significant (p&lt;0.001) difference (Mean±SE) between the control samples for either 10 seconds (log 10  5.91±0.15) or 20 seconds (log 10  6.18±0.21) and ozone treated samples for either 10 seconds (log 10  3.57±0.37) or 20 seconds (log 10  3.77±0.42). In study 2, 40 sterile saliva coated glass beads were put into bijoux bottles with 3 mls of Todd Hewitt broth for control and test groups.  S. sobrinus  and  S. mutans  were inoculated and incubated anaerobically overnight. Each glass bead was washed with 2 mls of PBS. Immediately, 10 seconds of ozone was applied to the glass beads in the test groups. Subsequently, each glass bead in the test and control groups was placed in 3 mls of Todd Hewitt broth with six more sterile glass beads and were vortexed for 30 seconds. After decimal dilutions, 100 ml aliquots were spread on blood agar plates supplemented with 5% (V/V) horse blood and placed in an anaerobic chamber at 37° C. for two days. The number of each colony type was counted and calculated. Using the paired student t-test, there was a significant reduction (p&lt;0.0001) (Mean±SE) between the control samples for  S. sobrinus  (log 10  4.61±0.13) and  S. mutans  (log 10  3.93±0.07) and ozone treated samples for  S. sobrinus  (log 10  1.09±0.36). This treatment regime is therefore an effective, quick, conservative and simple method to kill micro-organisms in primary root carious lesions.  
         EXAMPLE 6  
         [0042]    The Effect of Ozone on Gum Disease.  
           [0043]    Inflamed human gingivitis is exposed to ozone using the techniques herein described. After exposure to ozone, the inflammation is illuminated or reduced. In addition, enzyme levels in extracts from inflamed human gingiva are alleviated and/or reduced.  
         EXAMPLE 7  
         [0044]    The Effect of Ozone on the Treatment of Root Canals.  
           [0045]    Bacteria cultures of  Streptococcus aurous, Lactobacillus salivarius  and  Lactobacillus acidophilus , known as being associated with dental diseases are exposed to ozone using the techniques herein described and growth of the bacteria cultures is eliminated or inhibited.  
         EXAMPLE 8  
         [0046]    The Effect of Ozone in the Treatment of Month Ulcerations.  
           [0047]    Month ulcerations are exposed to ozone using the techniques herein described and microorganisms in the ulceration are eliminated or reduced. In addition, enzyme levels in the month ulcerations are alleviated and/or reduced.  
         EXAMPLE 9  
         [0048]    The Effect of Ozone in the Treatment of Bad Breath.  
           [0049]    Bad breath is caused, in part, by the retention and subsequent degradation of dead cellular material, by microorganisms, sloughed off continuously by a normal, healthy mouth. A mouth is exposed to ozone using the techniques herein described and the microorganisms associated with bad breath are eliminated or reduced. In addition enzyme levels in the month are alleviated and/or reduced.  
           [0050]    The present invention further relates to apparatus for the treatment of dental caries utilizing an oxidizing gas.  
           [0051]    The role of specific micro-organism such as, for example, streptococcus mutants in dental caries is well documented. Enzymes produced by such micro-organisms synthesize dextran from the sucrose passing through the month with food or drink resulting in the formation of dental plaque and dental caries.  
           [0052]    Dental caries is the decay of teeth caused by demineralization of the enamel surface with organic acids produced by bacteria which adhere to teeth surfaces.  
           [0053]    Heretofore, dental caries have been removed through the use of conventional grinding handpieces, lasers and air-blasting apparatus. However high-speed turbine drills or low-speed drills unfortunately will grind both caries and sound dentine. Accordingly, a practitioner must select and grind only caries and consequently, this method depends upon this skill of the practitioner. Lasers have been utilized to remove caries, however, not much success has been achieved for varies reasons. For example, blackened charred tissue blocks the laser radiation which, in turn, prevents the laser from reaching caries therebelow. In addition, heating also interrupts the ablation process.  
           [0054]    With regard to air-blasting treatment of caries sound, dentine may also be easily removed, and accordingly, the skill of the practitioner is of outmost importance.  
           [0055]    The present invention provides for the treatment of caries without the disadvantages of the prior art hereinabove noted.  
         SUMMARY OF THE INVENTION  
         [0056]    Apparatus for the treatment of dental caries in accordance with the present invention generally includes a source of oxidizing gas and a handpiece for delivering the gas to a tooth. A cup attached to the handpiece, is provided for receiving the gas and exposing a selected area of the tooth to the gas.  
           [0057]    The cup may include a resilient edge for sealably engaging the tooth around the selected area to prevent escape of the gas therepast. Alternatively, a suitable sealant may be utilized for providing the sealed engagement between the cup and the tooth. This enables a totally closed system for the application of the gas to the tooth.  
           [0058]    A source of oxidizing gas may include an ozone generator and an ozone pump. An aspiration pump may be provided, along with an aspiration line connected to the handpiece, for enabling circulation of the gas into and out of a cup chamber subtending the cup edge. In that regard a controller may be provided for regulating the ozone and aspiration pumps in order to circulate the gas into an out of the cup chamber at a pressure insufficient to escape past the sealed engagement between and the tooth.  
           [0059]    The apparatus may further include a source of reductant, in fluid communication with the cup chamber and a reductant pump may be provided for circulating the reductant through the cup chamber in order to flush the oxidizing gas from the cup chamber and into the aspiration line.  
           [0060]    A waste accumulator may be provided and connected to the aspiration line for receiving the reductant. In addition, a filter may be provided for removal of any residual oxidizing gas from the aspiration line.  
           [0061]    In one embodiment of the present invention the cup edge includes a relatively uniform perimeter for sealably engaging a tooth between a cusp and a gingiva. In another embodiment of the present invention, a cup edge may include a contour enabling a sealably engagement with adjacent teeth. More specifically, the cupped edge may have a perimeter contoured for sealably engaging cusps of adjacent teeth. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0062]    The advantages and features of the present invention will be better understood by the following description when considered in conjunction of the accompanying drawings, in which:  
         [0063]    [0063]FIG. 1 illustrates a block diagram of apparatus for treatment of dental caries in accordance with the present invention, the apparatus generally includes a source of oxidizing gas, an aspiration pump, a source of reductant, a reductant pump and a controller for providing the oxidizing gas to a handpiece;  
         [0064]    [0064]FIG. 2 illustrated a handpiece in accordance with the present invention for delivering a gas to a tooth and generally showing a cup attached to the handpiece for receiving the gas;  
         [0065]    [0065]FIG. 3 illustrated the handpiece with an alternative cup embodiment, the alternative embodiment cup having an arcuate shape for facilitating application of oxidizing gas to a tooth;  
         [0066]    [0066]FIG. 4 is a diagram showing application of oxidizing gas to a tooth between a cusp and a gingival utilizing the handpiece and cup shown in FIG. 3;  
         [0067]    [0067]FIG. 5 is cross-sectional view of the cup shown in FIG. 2 that is suitable for use in the present invention;  
         [0068]    [0068]FIG. 6 is a cross sectional view an alternative embodiment of a cup for exposing a selected area of a tooth oxidizing gas;  
         [0069]    [0069]FIG. 7 is a cross sectional diagram showing an alternative embodiment of a cup in accordance with the present invention for exposing adjacent teeth to oxidizing gas; and  
         [0070]    [0070]FIG. 8 illustrates the use of the cup shown in FIG. 7 as it may be applied to adjacent teeth. 
     
    
     DETAILED DESCRIPTION  
       [0071]    With reference to FIGS.  1 - 4 , there is shown apparatus  10  in accordance with the present invention for the treatment of dental caries which includes a source  12  of oxidizing gas, preferably ozone, and a handpiece  16  (see FIG. 2) for delivering the gas to a tooth, not shown in FIGS.  1 - 3 . The effectiveness of an oxidizing gas such as ozone is set forth in co-pending International Patent Application PCT/EP99/04035 now U.S. Ser. No. 09/700,275 entitled “Use Of Ozone For The Preparation Of Medicaments For The Treatment of Dental Caries” by Edward Lynch. This application is incorporated herewith in its entirety including all specification and drawings by this specific reference thereto.  
         [0072]    As illustrated in FIG. 1, the ozone source  12  includes an ozone generator  20  and an ozone pump  22  for supplying ozone through a line  24 , a connector  28  and lines  30  to the handpiece  16 . As used herein, the term “ozone” is intended to embrace any suitable oxidizing gas, pure ozone, ionized air and other ozone gaseous mixtures.  
         [0073]    As noted in the referenced international patent application, ozone is delivered at a pressure, concentration and for a period of time sufficient to penetrate the carious tissue and kill substantial all of the micro-organism within a carious lesion. Specific examples of the use of ozone are set forth in the referenced patent application and are incorporated herewith by the specific reference thereto.  
         [0074]    As shown in FIGS.  2 - 3 , cups  34   36  attached to the handpiece  16  are provided for receiving the gas and exposing a selected area  38  on a tooth  40 , see FIG. 3. The cup  34  may be attached to the handpiece  16  in any conventional manner and include a resilient edge, or sidewall,  44  for sealable engaging the tooth  40  to prevent the escape of gas therepast.  
         [0075]    Many different sized and shaped cups may be utilized, as for example shown in FIG. 3 the cup  36  includes an arcuate trunk  50  to facilitate the placement of the cup  36  over the selected area  38  as shown in FIG. 4. The cups  34 ,  36  may have relatively uniform perimeters  52 ,  54  for sealably engaging the tooth  40  between a cusp  58  and a gingiva  60  as shown in FIG. 4.  
         [0076]    A further cup embodiment  64  is shown in cross-section in FIG. 6 includes a tapered sidewall  66  that may be used for application of oxidizing gas to a smaller selected area (not shown) on the tooth  40 .  
         [0077]    While a resilient edge or sidewall may be used to couple the cup to the selected area  38  on the tooth  40 , it should be appreciated that a separate sealant  68  (See FIG. 6) may be utilized for providing a sealable engagement between the cup  64  and the tooth  40 . In this instance, the sidewall  66  need not be resilient.  
         [0078]    Another embodiment of a cup  70  is shown in cross-section in FIG. 7 which includes walls  72  which are contoured for enabling the sealable engagement with adjacent teeth  74 ,  76  as shown in FIG. 8. As shown in FIG. 8, a cup edge  80  has a perimeter contour  82  for providing a sealable engagement with cups  86 ,  88  of adjacent teeth  74 ,  76 .  
         [0079]    All of the cups  34 ,  64 ,  70 , cross-sectionally illustrated in FIGS.  5 - 7 . include cup chambers  92 ,  94 ,  96  that subtend cup edges  98 ,  100 ,  102 . As shown each of the cups  34 ,  64 ,  70  include walls  44 ,  66 ,  72  that define the chambers  92 ,  94 ,  96  and include first perimeters  106 ,  108 ,  110  for sealably coupling the walls  44 , 66 ,  72  to the handpiece  16 . Second perimeters  112 ,  114 ,  116  provide for coupling the walls  44 , 66   72  to the tooth  40  and exposing the selected areas  38  to gas circulated in the chambers  92 ,  94 ,  96 .  
         [0080]    As shown in FIG. 6, the embodiment  64  the first perimeter  108  may be larger than the second perimeter  115  or, as shown in FIG. 7, the first perimeter  110  may be smaller than the second perimeter  116 . Accordingly this variation in cup  64 ,  70  design enables the application of oxidizing gas the any number of tooth contours and to the application of oxidizing gas to a plurality of teeth has hereinabove described.  
         [0081]    With reference again to FIG. 1, the apparatus  12  includes an aspiration pump  120  and lines  30 ,  122 ,  124  connected to the handpiece  16  for enabling circulation of the ozone into and out of the cup chambers  92 ,  94 ,  96 .  
         [0082]    A controller  126 , which may be of any conventional circuit design, is provided for regulating the ozone and aspiration pumps  22 ,  120  in order to circulate the gas into and out of the cup chambers  92 ,  94 ,  96  at a pressure insufficient to permit escape of the gas past a sealed engagement between the cups  34 ,  64 ,  70  and teeth  40 ,  86 ,  88 . Control of the gas flows may also be effected through valves  127 ,  127  regulated by the controller  126 .  
         [0083]    Additionally, the apparatus  10  may include a reductant source  128 , which is in fluid communication with the cup chambers  92 ,  94 ,  96  through lines  30 ,  130  and a parastalic pump  131 . The reductant, which may be a solution of thiocyanate or peppermint, is utilized to flush the cup chambers  92 ,  94 ,  96  of oxidizing gas. The oxidizing gas is flushed into the aspiration line  122  following ozone treatment of the tooth  40 ,  86 ,  88 . The reductant is then aspirated through line  122  and into a waste accumulator  132 .  
         [0084]    Any residual ozone is then aspirated from the accumulator  132  through the line  124  and into a canister  134  through line  136  for final elimination of the ozone. Thus, the apparatus  12  provides for a totally closed system for the application and removal of ozone to and from teeth  40 ,  86 ,  88 .  
         [0085]    It should also be appreciate that when the cups  34 ,  36 ,  64  are utilized between teeth  40 ,  138  (not shown in FIG. 4) a separate dam  140  maybe utilized as necessary to enable the cups  34 ,  36 ,  64  (not shown in FIG. 4) to sealably enclose a selected area for treatment between the teeth  40 ,  138 .  
       EXAMPLE 1  
     Ozone Detection (ppm) Around the Cup Using a Ozone Analyzer After Either 10 or 20 s of Ozone Application in vivo  
       [0086]    Study or Test: Ozone Detection (ppm) Around the Cup  34  Using a Ozone Analyzer After Either 10 or 20 s of Ozone Application in vivo  
         [0087]    Purpose: To assess the maximum ozone detectable level (ppm) around the cup  34  after either 10 s or 20 s of ozone application in vivo.  
         [0088]    Study or Test Protocol: 20 primary root carious lesions (PRCLs) were randomly selected when the cross-sectional study was conducted. The tip of the sensor was always held within 2 mm of the edge of the cup, positioned half way between the mesial and occlusal sides of the cup. The maximum ozone detectable level (ppm) around the cup from the extracted teeth using an ozone analyzer after 10 s of ozone application. The ozone analyzer used was an API 450 model available from ENVIRO Technologies, UK, and was calibrated by the supplier within the previous week of delivery and this device was not used for any other purpose other than this study in the interim.  
         [0089]    Overlying plaque was then removed using a hand held standard fine nylon fiber sterile toothbrush with water as a lubricant. Each tooth was dried using dry sterile cotton wool rolls and a dental  3  in 1-air syringe. The excavator blade was used to traverse the lesion in line with long axis of the tooth across the maximum gingival/occlusal dimension. Half of each lesion was removed using a sterile excavator. Subsequently, the remaining lesion was exposed to the ozone gas for a period of either 10 s or 20 s at room temperature (23° C.) and maximum detectable ozone level was also measured using this ozone analyzer.  
         [0090]    Test Results:  
         [0091]    The maximum ozone detectable level (ppm) around the cup from lesions for a period of either 10 s (Table 1 and FIG. 1) or 20 s (Table 2 and FIG. 2) ozone application during the treatment of root carious lesions were as follows:  
                                           TABLE 1                           Maximum ozone detectable level (ppm) after a 10 s of       ozone application                    Ozone detection       Teeth types   Sites   (10 s)                    Upper left incisor   Mesial   0.066       Upper right 1. premolar   Buccal   0.001       Upper right canine   Distal   0.002       Upper right 1. molar   Buccal   0.006       Upper left 2. premolar   Buccal   0.076       Lower right 2. premolar   Mesial   0.058       Lower left 1. premolar   Buccal   0.169       Lower left lateral   Buccal   0.106       Upper right lateral   Distal   0.001       Lower left canine   Labial   0.147                  
 
         [0092]    [0092]                                           TABLE 2                           Maximum ozone detectable level (ppm) after a 20 s of       ozone application                    Ozone detection       Teeth types   Sites   (20 s)                    Lower left lateral   Labial   0.137       Lower left 1. premolar   Buccal   0.177       Lower right incisor   Labial   0.069       Upper right canine   Labial   0.033       Upper right lateral   Labial   0.079       Lower left 2. premolar   Buccal   0.002       Lower right1. molar   Buccal   0.083       Upper left lateral   Labial   0.004       Lower left canine   Labial   0.056       Upper left 1. premolar   Mesial   0.001                    
         [0093]    Conclusion: The use of a cup is a safe way of delivering ozone when ozone was applied for a period of either 10 s or 20 s on the root carious lesions.  
       EXAMPLE 2  
     Assessment of Maximum Ozone Levels From Extracted Teeth After the use of Ozone for 10 s.—An in vitro Test Report  
       [0094]    Study or Test: Assessment of the maximum detectable ozone levels, detected adjacent to the cup, from extracted teeth after the use of ozone for 10 s in vitro.  
         [0095]    Purpose: To assess the maximum ozone detectable level (ppm) around a cup from the extracted teeth after a 10 s application of ozone.  
         [0096]    1. Study or Test Protocol: 14 Extracted Teeth Were Selected.  
         [0097]    The tip of the sensor was always held within 2 mm of the edge of the cup, positioned half way between the mesial and occlusal sides of the cup. The maximum ozone detectable level (ppm) around the cup from the extracted teeth using an ozone analyzer was recorded during 10 s of ozone application with the generator setting on maximum at level  10 . The ozone analyzer used was the API 450 model and this was calibrated by the supplier within the previous week of delivery. This device was not used for any other purpose other than this study in the interim.  
         [0098]    The Ozone Delivery System  
         [0099]    After plaque removal with 2 sterile cotton wool rolls, ozone gas was delivered onto the surface of each primary root carious lesion in each extracted tooth for 10 s after the lesion was dried for three seconds with a standard three in one dental syringe.  
         [0100]    Test Results:  
         [0101]    The maximum ozone detectable level (ppm) around the cup from the extracted teeth after a 10 s application of ozone during the treatment of root carious lesions were as shown in Table 3.  
                                           TABLE 3                           Maximum ozone detectable level (ppm)            Teeth types   Sites   Ozone detection                    Upper incisor   Mesial   0.005       Upper lateral incisor   Labial   0.004       Upper canine   Labial   0.003       Upper 1. premolar   Mesial   0.006       Upper 2. premolar   Distal   0.002       Upper 1. molar   Buccal   0.003       Upper 2. molar   Mesial   0       Lower incisor   Lingual   0.007       Lower lateral incisor   Distal   0.001       Lower canine   Mesial   0       Lower 1. premolar   Distal   0.009       Lower 2. premolar   Lingual   0.018       Lower 1. molar   Lingual   0.016       Lower 2. molar   Mesial   0.005                  
 
         [0102]    Conclusion: The use of a cup is a safe way of delivering ozone when ozone was applied for a period of 10 s on the root carious lesions on extracted teeth.  
       EXAMPLE 3  
     Measurement of Ozone From the Handpiece  
       [0103]    The handpiece  16  from the ozone generator  20  was attached directly to the inlet pipe a Mini-HiCon™ the ozone detector (not shown).  
         [0104]    Peak readings from Mini-HiCon™ (g/Nm 3 )  
                                                                                             Duration   Reading 1   Reading 2   Reading 3   Reading 4   Reading 5   Reading 6   Average       (seconds)   (g/Nm 3 )   (g/Nm 3 )   (g/Nm 3 )   (g/Nm 3 )   (g/Nm 3 )   (g/Nm 3 )   (g/Nm 3 )                                5   5.4   5.3   5.4   4.3   5.2   5.2   5.1       10   4.7   4.8   4.6   3.5   4.4   4.5   4.4       20   4.9   5.9   6.3   6.3           5.9       30   6.3   6.5   6.3   6.6           6.4       60   6.6   7.0   7.0   6.7           6.8                  
 
         [0105]    Peak readings from Mini-HiCon™ (ppm)  
                                                                                             Duration   Reading 1   Reading 2   Reading 3   Reading 4   Reading 5   Reading 6   Average       (seconds)   (ppm)   (ppm)   (ppm)   (ppm)   (ppm)   (ppm)   (ppm)                                5   2522   2475   2522   2008   2428   2428   2397       10   2195   2242   2148   1635   2055   2102   2063       20   2288   2755   2942   2942           2732       30   2942   3036   2942   3082           3000       60   3082   3269   3269   3129           3187                  
 
         [0106]    The peak reading was obtained after about 8 seconds (even when the generator was switched on for only 5 seconds) and perhaps represented an “overshoot” before the generator/detector combination stabilized for the&gt;20 second durations. The level then remained fairly constant at between 3.6 and 4.7 g/Nm 3 .  
         [0107]    To Convert From g/m 3  to ppm:  
         [0108]    The formula weight of ozone is 48 g and therefore 1 g of ozone is {fraction (1/48)}th of a mole.  
         [0109]    The molar volume of an ideal gas (at standard temperature and pressure) is 0.0224138 m 3 /mol.  
         [0110]    {fraction (0.0224138/48)}=467×10 −6  m 3 .  
         [0111]    Therefore 1 g/m 3  of ozone in air is 467 ppm.  
         [0112]    (The ozone detector gives readings as g/Nm 3  which is “normalized” to standard temperature and pressure).  
         [0113]    Measurement of the Ozone Dissolving in a Potassium Iodide Solution  
         [0114]    Ozone was passed through the handpiece  16 , immersed in 100 ml of a 20 mM potassium iodide solution in a 250 ml conical flask covered with parafilm for the stated durations. The handpiece was then removed and the flask sealed with a neoprene bung and shaken vigorously. A 1.50 ml aliquot was removed and its electronic absorption spectrum acquired. (These measurements were taken before a diffuser was fitted.) The generator settings were:—air=1, O 3 =1, vac=0, red=0, regulator-setting=10.  
                                                                         λ max     λ max     λ max     λ max         Duration   (351 nm)   (351 nm)   (351 nm)   (351 nm) average       (seconds)   absorbance   absorbance   absorbance   absorbance                                1   0.06   0.08   0.11   0.08       2   0.50   0.44   0.26   0.40       3   0.70   0.56   0.42   0.56       4   0.77   0.69   0.50   0.65       5   0.90   0.84   0.51   0.75       6   1.08   0.99   0.68   0.92       7   1.17   1.11   0.75   1.01       8   1.30   1.27   0.95   1.17       9   1.40   1.40   1.19   1.33       10   1.57   1.43   1.38   1.46                  
 
         [0115]    To Calculate the Concentration from the Peak Absorbance:  
         
       A=E×C×L  
     
         [0116]    where  
         [0117]    L=cell path length (1 cm)  
         [0118]    C=concentration (mol)  
         [0119]    E=extinction coefficient  
         [0120]    A=absorbance  
         [0121]    E for 1M=2.97×10 4    
         [0122]    E for 1 μM=0.0297 10  
         [0123]    C=A÷E          concentration in μmol/l is absorbance/0.0297  
                                                                                                         Total       Volume of   Ozone               λ max         dissolved       air/ozone   in air   Ozone       Duration   absorbance   Concentration   ozone   Ozone   mixture   (μg/ml =   in air       (seconds)   (average of 3)   (μmol/l)   (μmol)   (μg)   (ml)   g/m 3 )   (ppm)                                1   0.08   2.69   0.269   13   8   1.625   759       2   0.40   13.47   1.347   65   16   4.063   1897       3   0.50   18.86   1.886   91   24   3.792   1771       4   0.65   21.89   2.189   105   32   3.281   1532       5   0.75   25.25   2.525   121   40   3.025   1413       6   0.92   30.98   3.098   149   48   3.104   1450       7   1.01   34.39   3.439   165   56   2.946   1376       8   1.17   39.39   3.939   189   64   2.953   1379       9   1.33   44.79   4.479   215   72   2.986   1394       10   1.46   49.16   4.916   236   80   2.950   1378                  
 
         [0124]    NMR Analysis of Plaque/Caries  
         [0125]    1. Plaque samples were obtained from volunteers and each sample was divided into two. Half of each sample was treated with ozone and half left untreated as a control.  
         [0126]    2. The samples were each weighed. Then 600 μl of 0.5 M HClO 4  was added to each sample and rotamixed.  
         [0127]    3. The samples were centrifuged and supernatants retained.  
         [0128]    4. The samples were neutralized to a pH of between 6 and 8 and the volume of KOH used was noted.  
         [0129]    5. The samples were centrifuged again and 600 μl of supernatant were taken for analysis.  
         [0130]    6. 70 μl of D 2 O and 30 μl of sodium 3-trimethylsilyl-(2,2,3,3, - 2 H 4 ) -propionate (5 mM in D 2 O) were added prior to NMR analysis.  
         [0131]    NMR Analysis of Saliva  
         [0132]    1. Saliva samples were obtained from volunteers and each sample was divided into two. Half of each sample was treated with ozone and half left untreated as a control.  
         [0133]    2. The samples were centrifuged and supernatants retained.  
         [0134]    3. 70 μl of D 2 O and 30 μl of sodium 3-trimethylsilyl-(2,2,3,3, - 2 H 4 ) -propionate (5 mM in D 2 O) were added prior to NMR analysis.  
         [0135]    Iodine Standards (in 20 mM Potassium Iodide)  
                                                   Iodine Concentration   Absorbance at 351 nm                            4 μM   0.1144            5 μM   0.1410            7 μM   0.1690           10 μM   0.2002                      
 
         [0136]    Although there has been hereinabove described method apparatus for the treatment of dental and oral condition in accordance with the present invention for the purpose of illustrating the manner in which the invention may be used to advantage, it will be appreciated that the invention is not limited thereto. Accordingly, any and all modifications, variations or equivalent arrangements which may occur to those skilled in the art, should be considered to be within the scope of the invention as defined in the appended claims.